Ferric Reducing Antioxidant Power Activity Research Articles

Exploring the nutraceutical potential: Evaluating the nutritional and bioactive functions of five pomelo fruit varieties in Bangladesh

Pomelo (Citrus maxima), the largest citrus fruit, provides a variety of nutrients that have several health benefits, including antioxidant and antidiabetic functions. Antioxidants help combat oxidative stress by neutralizing reactive oxygen species (ROS) and reducing cellular damage. On the other hand, antidiabetic properties involve mechanisms such as enhancing insulin secretion, improving insulin sensitivity, inhibiting carbohydrate digestion and absorption, and regulating glucose metabolism. However, there is a lack of data on the comparative analysis of the physicochemical composition, bioactive properties, and antidiabetic effects of pomelo fruits grown in Bangladesh. To address this issue, the most common and popular high-yielding five cultivars of pomelo fruits grown in Bangladesh including LOCAL, BARI-2 (BARI: Bangladesh Agricultural Research Institute, Batabi Lebu-2), BARI-3, BARI-4, and BARI-6 were evaluated concerning proximate, minerals, and physicochemical properties with their antidiabetic and antioxidant properties. Research has revealed that all pomelo varieties contained a significant amount of proximate compositions and major minerals (Ca, Mg, K, Na, and Fe). The highest juice yield (75.37 ± 0.33 %), vitamin C content (79.56 ± 2.26 mg/100 mL of fresh juice), and carotenoid content (919.33 ± 0.62 μM β-Carotene Equivalent/g DM) were found in BARI-3 pomelo fruit and adhered to the sequence (p < 0.05): BARI-3 > LOCAL > BARI-4 > BARI-6 > BARI-2; BARI-3 > LOCAL > BARI-2 > BARI-4 > BARI-6, and BARI-3 > BARI-2 > BARI-6 > LOCAL > BARI-4, respectively. The anthocyanin content and inhibitory activity of α-glucosidase were found to be at their peak in the BARI-2 pomelo variety and the values were 50.65 ± 2.27 μg cyanidin 3-glucoside equivalents/100 g DM and 85.57 ± 0.00 μM acarbose equivalents/g DM, respectively. BARI-3 pomelo variety showed highest DPPH antioxidant capacity (170.47 ± 0.01 μM Trolox equivalents/g DM), while the BARI-6 pomelo variety exhibited the highest total phenolic content (6712.30 ± 1.84 μg gallic acid equivalents/g DM), and ferric-reducing antioxidant power activity (183.16 ± 0.01 μM Fe(II) equivalents/g DM). Therefore, this study explores the nutritional value and bioactivity of five popular pomelo varieties in Bangladesh, offering valuable insights for utilizing high-value citrus resources and understanding their health-promoting functions.

Characterization of the antioxidant activity, identified free radical-relieving components by LC/QTOF/MS and acute oral toxicity studies of Tri-Tharn-Thip tea

This study assessed the antioxidant activities and bioactive maker of Tri-Than-Thip tea (Tri-TTa) to provide database support for the use of Tri-Than Thip remedy according to the Thai Pharmaceutical Textbook and aims to develop herbal medicine or food from natural products. Tri-TTa and herbal components were tested for antioxidant scavenging activity (DPPH assay, ABTS assay), chain-breaking/iron ion chelating activity (Metal Chelating Activity; MAC, the ferric-reducing antioxidant power activity; FRAP), superoxide anion radical scavenging activity (NBT assay), oxygen radical antioxidant capacity (ORAC assay), total content of Phenolic (TCP) and flavonoid (TCP) substance. The chemical components were separated and investigated by LC/QTOF/MS for safe dosages due to acute oral toxicity in rats. The Tri-TTa showed the strongest inhibition of antioxidant activity with the DPPH, ABTS, and MCA assay, with IC50 values of 0.087 ± 0.003, 0.025 ± 0.000, and 0.012 ± 0.000 mg/mL, respectively. In addition, Tri-TTa can also inhibit superoxide anion radicals, with IC50 values of 158 ± 0.009 mg/mL, and the oxygen radical was 3.47 ± 0.03 μM of TE/g extract. TCP, TCF, and FRAP values of Tri-TTa were 154.123 ± 1.326, 80.233 ± 14.268 mg equivalent/g of extract, and 1092.457 ± 106.024 mM FeSO4/mg, respectively. Additionally, Tri-TTa contains important substances in the phenolic and flavonoid groups that have good antioxidant abilities and were confirmed to be safe through acute oral toxicity testing in rats, which revealed no toxicity-related effects at high doses. Tri-TTa is a strong candidate for use as a natural product with antioxidant activity, suggesting that plant polyphenol content may promote antioxidant activity. These results support further research on Thai folk remedy infusions as promising antioxidant agents that can be developed for food, tea, or tonic drugs from natural.

Chemical profiling and biological activity assessment of volatile and non-volatile compounds in Rosmarinus officinalis residues

Rosmarinus officinalis L. is a Mediterranean medicinal and aromatic plant, widely used in several industries. The present study aimed to characterize the chemical composition of volatile compounds, encompassing essential oils (EO): hydrosol extract (HE): and water residue extract (WRE1). Additionally, the investigation focused on non-volatile components, including powder phenolic extract (PPE): water residue extract (WRE2): and solid residue extract (SRE): while also assessing their antioxidant and antibacterial activities. The chemical compositions of volatile components were determined by using a Gas Chromatograph equipped with a Mass Spectrometer (GC/MS): while polyphenol extracts were analyzed using Ultra-High-Performance Liquid Chromatograph equipped with a photodiode array detection Mass Spectrometer (UHPLC-DAD-ESI/MS). The antioxidant activity was determined by 1,1-diphenyl-2-picrylhydrazyl free radical scavenging (DPPH) and ferric reducing antioxidant power (FRAP): while the antibacterial effect was evaluated against four pathogenic bacterial strains using disc diffusion and broth microdilution methods. The GC/MS analysis showed that R. officinalis EO was dominated by 1,8-cineole (47.70%) and α-pinene (15.50%). 1,8-cineole (56.67%) and camphor (26.27%) were found as the predominant constituents of HE, while volatile components of WRE1 were mainly dominated by camphor (10.11%). The UHPLC-DAD-ESI/MS analysis revealed the existence of a plethora of polyphenolic components. In PPE and SRE, the predominating compounds were carnosic acid and carnosol, respectively. Rosmarinic acid was the main constituent in WRE2. The results of DPPH free radical scavenging and FRAP activities showed that PPE exhibited strong antioxidant activity, followed by SRE and WRE2. EO and HE showed moderate antioxidant activity, while volatile components of WRE1 exhibited the lowest antioxidant effect. Regarding the antibacterial activity, PPE and SRE indicated the highest effect against the pathogenic bacteria, while WRE1 volatile components had the weakest antibacterial activity. The conducted study showed that material plant left after hydrodistillation of R. officinalis may be used as a new source of bioactive volatile and polyphenolic components with valuable pharmacological activities.

D-optimal Design Optimization of Solvent Mixture for Flavonoid Extraction from Phalaenopsis Leaves with Antioxidant Activity.

This study aimed to optimize the extraction of flavonoids and antioxidants from Phalaenopsis leaves by using solvent mixtures. The total flavonoid content (TFC) and antioxidant activity were evaluated using the colorimetric method and ferric-reducing antioxidant power (FRAP), respectively. Maceration extracts from fresh leaves were used for the analysis. The study used the Design Expert 13.0 program to optimize the solvents (water, acetone, and methanol) and their combined ratio. The results showed that 100% acetone was the best solvent for both responses, with a desirability value of 0.884, TFC of 0.434 mg QE/g fresh weight (FW) and FRAP of 713.53 μmol TE/g FW. Screening of the most potent Phalaenopsis genotypes for obtaining the most active leaf extract showed that P. amboinensis and P. pantherina were the best genotypes for TFC (0.786-0.797 mg QE/g FW) and FRAP activity (862.25-891.48 μmol TE/g FW). This study demonstrates an easy and useful way to obtain flavonoids and antioxidants from Phalaenopsis materials that can be used in the flower-based industry to make new functional ingredients.

Antioxidant and Antiaging Potential of Salak Fruit Extract (Salacca zalacca (Gaert.)Voss)

Natural skin aging is indicated by a loss of skin structure and integrity caused by external factors including UV exposure. This exposure causes oxidative stress on skin cells, initiates aging, and degradation of extracellular matrix (ECM) structure which is composed of many proteins, including collagen and elastin. ECM degradation is caused by the increased activity of proteolytic enzymes, one of which is elastase (closely related to wrinkling). To inhibit oxidative stress during the photoaging process, the skin needs antioxidant compounds. Salak (Salacca zalacca (Gaert.)Voss) is a fruit that is rich in antioxidants because it contains flavonoid, phenolic, and polyphenolic compounds, including chlorogenic acid. The purpose of this study is to demonstrate the antioxidant activity and antiaging properties of salak fruit extract (SFE) as a candidate for active ingredients in the prevention of aging. To determine the antioxidant activity of SFE, 2,2-diphenyl-1-picrylhydrazil (DPPH) scavenging and ferric reducing antioxidant power (FRAP) assays were performed, while elastase assays were performed to determine the anti-aging properties of SFE. The IC50 values for DPPH scavenging and FRAP activity of SFE were 107.52 μg/mL and 16.82 μg/mL with the highest activity at 68.79% and 97.96%, at concentrations of 200 and 50 μg/mL, respectively. Meanwhile, the anti-aging properties determined through the elastase assay showed an IC50 value of 19.71 μg/mL with the highest inhibition 72.50% at a concentration of 66.67 μg/mL. SFE has the potential as an active ingredient in preventing aging through its antioxidant activity and anti-aging properties.

&lt;i&gt;In Vitro&lt;/i&gt; Studies on Antioxidant Potential of Apple (&lt;i&gt;Malus domestica&lt;/i&gt;) Fructus Extract Nanoparticle

Oxidative stress results from an imbalance of free radicals and antioxidants in the body. Antioxidants are needed to prevent oxidative stress. A diet rich in fruits and vegetables, which are high in antioxidants, should help avoid oxidative stress. One source of antioxidants is apples (Malus domestica) from the Rosaceae family because they have some bioactive compounds such as catechin, chlorogenic acid, quercetin, and phloridzin. Recently, many studies have used nanotechnology to formulate plant extracts. Due to their size and distinctive physicochemical properties, nanoparticles in plant extracts have various benefits. Analyzing apple extract nanoparticles’ antioxidant capacity was the goal of this work. The synthesized nanoparticles of apples were made by using chitosan, glacial acetic acid, propylene glycol, ethanol, DMSO, and Na-TPP. A dynamic light scattering particle size analyser was used to measure the zeta potential and particle size. Antioxidant activity was measured by 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging, Hydrogen Peroxide (H2O2) scavenging activities, and Ferric Reducing Antioxidant Power (FRAP) assay using colorimetric methods. At a concentration of 100 g/ml, the most DPPH was scavenged (80.35%). Apple extract nanoparticles have strong DPPH scavenging activity with IC50 = 12.16 ± 2.98 µg/ml and H2O2 scavenging activity with IC50 = 81.96 ± 7.23 µg/ml. The highest H2O2 scavenging activity was at 200 µg/ml concentration (84.47%) and the highest FRAP activity was at a concentration of 50 µg/ml (444.29%). The concentration is directly proportional to the antioxidant activity of apple extract nanoparticles. Based on this study, apple extract nanoparticle has strong antioxidant activity.

Identification of Antioxidant Metabolites from Five Plants (Calophyllum inophyllum, Gardenia taitensis, Curcuma longa, Cordia subcordata, Ficus prolixa) of the Polynesian Pharmacopoeia and Cosmetopoeia for Skin Care.

Oxidative stress contributes to impairment of skin health, the wound healing process, and pathologies such as psoriasis or skin cancer. Five Polynesian medicinal plants, among the most traditionally used for skin care (pimples, wounds, burns, dermatoses) are studied herein for their antioxidant properties: Calophyllum inophyllum, Gardenia taitensis, Curcuma longa, Cordia subcordata, and Ficus prolixa. Plant extracts were submitted to in vitro bioassays related to antioxidant properties and their bioactive constituents were identified by a metabolomic analytical approach. High performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS) analysis was performed leading to the characterization of 61 metabolites. Compounds annotated for F. prolixa and C. subcordata extracts were reported for the first time. Antioxidant properties were evaluated by total phenolic content (TPC), free radical scavenging DPPH (1,1-diphenyl-2-picryl-hydrazyl), and Ferric Reducing Antioxidant Power activity (FRAP) assays. F. prolixa extract was the most active one and showed antioxidant intracellular activity on keratinocytes by Anti Oxydant Power 1 assay. Online HPLC-DPPH allowed the identification of phenolic bioactive compounds such as quercetin-O-rhamnoside, rosmarinic acid, chlorogenic acid, procyanidins, epicatechin, 5-O-caffeoylshikimic acid, and curcumin as being responsible for the scavenging properties of these plant extracts. These results highlight the potential of F. prolixa aerial roots as a source of antioxidants for skin care applications.

The dynamics of bioactive compounds and their contributions to the antioxidant activity of postharvest chive (Allium schoenoprasum L.)

Organosulfur compounds, phenolic compounds, and ascorbic acids (AsA) are known to account for the bulk of chive’s (Allium schoenoprasum L.) antioxidant properties. This study uncovered the contribution of each of these compounds to the chive's antioxidant activity under different storage conditions. The results showed that room temperature (RT) accelerated the accumulation of reactive oxygen species, though phenolics, organosulfur compounds, activities of antioxidant enzymes, and scavenging activity toward hydroxyl radical (OH) and superoxide anion (O2−) were observed to be enhanced in chives stored at RT. In contrast, AsA content, DPPH (1,1-diphenyl-1-picrylhydrazyl) scavenging and FRAP (ferric reducing antioxidant power) activity of the chive were increased by LT on day 5. Furthermore, S-alk(en)ylcysteine sulfoxides (CSOs) showed OH scavenging and weak DPPH scavenging but had no O2− scavenging and FRAP capacity. Volatile organosulfur compounds showed no antioxidant activities. Conclusively, the data demonstrated that AsA was largely responsible for DPPH scavenging and FRAP activity of the chive, while phenolic compounds, especially vanillic acid and p-hydroxybenzoic acid, were primarily responsible for OH and O2− scavenging activity.

Hematological parameters, obesity, stress and oxidant - antioxidant indicators in patients with or without recurrent aphthous stomatitis: A case control study

IntroductionRecurrent Aphthous Stomatitis (RAS) is a frequent chronic disease of the oral cavity that affects 5–25 % of the population with a plethora of predisposing factors. Despite its equivocal etiology, immune alterations, hematologic deficiencies and oxidative stress has been reported to be significant etiologic factors. Stress and obesity are other environmental factors that have been studied to understand associations with RAS. ObjectivesThis study investigated the association of stress, hematologic parameters, oxidative indices and other selected salivary factors in a case control study on RAS Methods: Twenty-two participants each in both case and control groups were recruited with saliva and serum samples collected from them after a self-administered Recent Life Changing Questionnaire (RLCQ). OHI-S and salivary flow rate (SFR) were calculated with selected hematologic parameters and oxidative indices such as Total oxidant (TOS) and anti-oxidant (TAS) levels and their ratio - Oxidative Stress Index (OSI). Anti-oxidative indices of Ferric-Reducing Antioxidant Power (FRAP) and Glutathione Peroxidase Activity (GsPHx) were also estimated. Results: The RAS group had a significantly higher RLCQ scores at a median of 145 more than the control (57.5). There was no significant in their obesity indices, however there was a significant higher mean in the ESR (p< 0.0001) and Vit B12 (p = 0.0001); OHI-S was also significantly higher in the RAS group with a median of 1.65. Both the salivary and serum TOS were significantly higher in the RAS (10.0 ± 3.8, 15.4 ± 8.9) compared to the control group (7.92 ± 1.49, 9.56 ± 3.5). GsPHx activity was significantly higher in both the saliva and serum in the control group (0.08 ± 0.08, 0.19 ± 0.11) while nil significant difference was found in the FRAP activity. Regression showed most important variables to be the salivary GsPHx activity, followed by serum OSI and GsPHx activity. ConclusionThe oxidative indices of TOS, TAS and GsPHx can serve as significant biomarkers in detecting RAS. This further corroborates the role of immune dysregulation in the etiology and predisposition to RAS.

Phytochemical Composition and Antioxidant and Anti-Inflammatory Activities of Humboldtia sanjappae Sasidh. & Sujanapal, an Endemic Medicinal Plant to the Western Ghats.

Ethnomedicinal plants are important sources of drug candidates, and many of these plants, especially in the Western Ghats, are underexplored. Humboldtia, a genus within the Fabaceae family, thrives in the biodiversity of the Western Ghats, Kerala, India, and holds significant ethnobotanical importance. However, many Humboldtia species remain understudied in terms of their biological efficacy, while some lack scientific validation for their traditional uses. However, Humboldtia sanjappae, an underexplored plant, was investigated for the phytochemical composition of the plant, and its antioxidant, enzyme-inhibitory, anti-inflammatory, and antibacterial activities were assessed. The LC-MS analysis indicated the presence of several bioactive substances, such as Naringenin, Luteolin, and Pomiferin. The results revealed that the ethanol extract of H. sanjappae exhibited significant in vitro DPPH scavenging activity (6.53 ± 1.49 µg/mL). Additionally, it demonstrated noteworthy FRAP (Ferric Reducing Antioxidant Power) activity (8.46 ± 1.38 µg/mL). Moreover, the ethanol extract of H. sanjappae exhibited notable efficacy in inhibiting the activities of α-amylase (47.60 ± 0.19µg/mL) and β-glucosidase (32.09 ± 0.54 µg/mL). The pre-treatment with the extract decreased the LPS-stimulated release of cytokines in the Raw 264.7 macrophages, demonstrating the anti-inflammatory potential. Further, the antibacterial properties were also evident in both Gram-positive and Gram-negative bacteria. The observed high zone of inhibition in the disc diffusion assay and MIC values were also promising. H. sanjappae displays significant anti-inflammatory, antioxidant, antidiabetic, and antibacterial properties, likely attributable to its rich composition of various biological compounds such as Naringenin, Luteolin, Epicatechin, Maritemin, and Pomiferin. Serving as a promising reservoir of these beneficial molecules, the potential of H. sanjappae as a valuable source for bioactive ingredients within the realms of nutraceutical and pharmaceutical industries is underscored, showcasing its potential for diverse applications.

Nutrient Composition and Antioxidant Activity of Cercis chinensis Flower in Response to Different Development Stages

Cercis chinensis Bunge (C. chinensis), well known as an ornamental plant widely distributed in China, and its flowers, bark, fruit, etc., have multiple bioactivities. However, reports on the changes in mineral elements, nutrient composition and antioxidant activity in C. chinensis flower at different development stages are rare. In this study, the flower samples were collected every 20 days from March 2023 to May 2023. The changes in carbon (C), nitrogen (N), phosphorous (P), soluble protein (SP), amino acid (AA), non-structural carbohydrate (NSC), total phenol (TP) and total flavonoids (TF) content as well as antioxidant activity in C. chinensis flower at different development stages were investigated. The results suggested that C, N, and P content, the C:N:P stoichiometric ratio, NSC contents, SP, AA, TP, TF and antioxidant activity of flower showed large variations at three development stages. This study found that C and P contents showed a significant decrease with the development and opening of flowers, while N content showed an opposite trend. The soluble protein content first decreased and then increased. The amino acid content, total polyphenol content, and total flavonoid content all showed a significant downward trend, while the content of NSC increased. Both ABTS and ferric-reducing antioxidant power (FRAP) showed significant decreases at various developmental stages, but DPPH was completely opposite. The highest NSC content and DPPH activity were observed at stage III, but the highest AA, TP, TF, as well ABTS and FRAP activity wereobserved at stage I. These findings will improve understanding of the requirements and dynamic balance among C, N, and P, NSC and nutrient contents as well as antioxidant activity of C. chinensis flowers in response to development stages.

Production of Secondary Metabolites from Cell Cultures of Sageretia thea (Osbeck) M.C. Johnst. Using Balloon-Type Bubble Bioreactors.

Sageretia thea is used in the preparation of herbal medicine in China and Korea; this plant is rich in various bioactive compounds, including phenolics and flavonoids. The objective of the current study was to enhance the production of phenolic compounds in plant cell suspension cultures of Sageretia thea. Optimum callus was induced from cotyledon explants on MS medium containing 2,4-dichlorophenoxyacetic acid (2,4-D; 0.5 mg L-1), naphthalene acetic acid (NAA, 0.5 mg L-1), kinetin (KN; 0.1 mg L-1) and sucrose (30 g L-1). Browning of callus was successfully avoided by using 200 mg L-1 ascorbic acid in the callus cultures. The elicitor effect of methyl jasmonate (MeJA), salicylic acid (SA), and sodium nitroprusside (SNP) was studied in cell suspension cultures, and the addition of 200 µM MeJA was found suitable for elicitation of phenolic accumulation in the cultured cells. Phenolic and flavonoid content and antioxidant activity were determined using 2,2 Diphenyl 1 picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethybenzothiazoline-6-sulphonic acid (ABTS), ferric reducing antioxidant power (FRAP) assays and results showed that cell cultures possessed highest phenolic and flavonoid content as well as highest DPPH, ABTS, and FRAP activities. Cell suspension cultures were established using 5 L capacity balloon-type bubble bioreactors using 2 L of MS medium 30 g L-1 sucrose and 0.5 mg L-1 2,4-D, 0.5 mg L-1 NAA, and 0.1 mg L-1 KN. The optimum yield of 230.81 g of fresh biomass and 16.48 g of dry biomass was evident after four weeks of cultures. High-pressure liquid chromatography (HPLC) analysis showed the cell biomass produced in bioreactors possessed higher concentrations of catechin hydrate, chlorogenic acid, naringenin, and other phenolic compounds.

Box-Behnken design based optimization of phenolic extractions from Polygonum equisetiforme roots linked to its antioxidant and antibacterial efficiencies

PurposeThePolygonum equisetifomeis a prospective plant source of high protein, unsaturated fatty acids, and useful safe bioactive molecules. Therefore, the aim of this study was to optimize the ultrasonic aqueous extraction of phenols fromP. equisetifomeroots using Box-Behnken design based statistical modeling, and to evaluate the antioxidant and antibacterial efficiencies ofP. equisetifomeroot extracts against pathogenic bacteria.MethodsIn this study, the box-behnken design was used to optimize the extraction of phenols. The extraction temperature (30–70°C), ultrasound assisted extraction (UAE) time (1–9 min), and liquid-solid ratio (35–45 mL/g) were investigated as the factors that influence the phenolic yield (Y1) and their DPPH (1,1-diphenyl-2-picrylhydrazyl) scavenging activity (Y2).ResultsThe optimal conditions for both responses were 50°C, 5 min, and 40 mL/g. At these conditions, Y1 reached its maximum to be 45.321 mg GAE/g dry weight and Y2 to be 120.354 μmol Trolox/g dry weight. TheP. equisetifomeroots contained water soluble phenol, high anthocyanin, and condensed tannins. Interestingly, theP. equisetifomeextracts showed a relation to its antioxidant and antibacterial activities, FRAP (Ferric-reducing/antioxidant power), and ABTS scavenging activity were determined. The morphological and physico-chemical features of the extract were analyzed using SEM-EDX, FT-IR, and minimum inhibitory concentration (MIC) was analyzed against several pathogenic bacteria. The antibacterial activity of the extract showed that the extract is more efficient against Staphylococcus aureus, while theP. equisetifomeextracts showed efficient MIC againstS. aureus, followed by Bacillus cereus.SuggestionsThe relation ofP. equisetifomeextracts to its antioxidant, and antibacterial efficiencies open a new avenue of their potential uses in the food and pharmaceutical industries.

Evaluation of seasonal variation, effect of extraction solvent on phytochemicals and antioxidant activity on Rosmarinus officinalis grown in different agro-ecological zones of Kiambu County, Kenya

BackgroundRosemary (Rosmarinus officinalis) is a commonly used culinary herb with great potential applications in the pharmaceutical, food, and cosmetics industries because of its reported bioactive phytochemicals and antioxidant properties. The purpose of the study was to investigate the effect of seasonal variations in different agro-ecological zones (AEZs) on the phytochemical content and corresponding antioxidant activities of R. officinalis, to ascertain the best growth period at which the plant possesses the highest phytochemical components and most potent antioxidant property. The study also aimed at comparing different extraction solvents to establish the best extraction system for the bioactive compounds.MethodsThe leaves of R. officinalis were harvested from six purposively selected sites in four agro-ecological zones of Kiambu County, Kenya both in the wet and the dry seasons. Phytochemicals were extracted in 80% methanol, 80% ethanol, and distilled water. Total phenolic content (TPC), total flavonoids content (TFC), and total tannins content (TTC) were measured spectrophotometrically as gallic acid equivalent (GAE), rutin equivalent (RUTE) and tannic acid equivalent (TAE), respectively. The antioxidant activities were measured using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric-reducing antioxidant power (FRAP). The 80% ethanolic solvent was used to compare the phytochemical content and corresponding antioxidant activities of R. officinalis leaf samples collected from two consecutive seasons in different agro-ecological zones.ResultsThe solvents showed no significant difference (P > 0.05) in TPC with ethanol repotting the highest followed by methanol and water ranging from 39.71 ± 6.77, 24.91 ± 5.15 and 24.91 ± 7.30 (mg/g GAE), respectively. The aqueous TFC (117.22 ± 3.64 mg/g RUTE) was the highest followed by ethanolic and methanolic with 34.72 ± 2.13 and 16.86 ± 2.80 mg/g RUTE, respectively. The TTC of water, methanol, and ethanol extracts were; 19.88 ± 4.59, 15.02 ± 1.25, and 4.27 ± 1.48 mg/g TAE, respectively. The DPPH activity between methanol and ethanol extracts showed no significant difference. The FRAP activity also showed no significant difference (P > 0.05) among the three solvents. There were significant differences between the wet and dry seasons in the phytochemical content. There was no recorded significant difference in the DPPH activity between the dry and wet season in all AEZs. FRAP was significantly higher in the dry season than the wet season for R. officinalis leaves harvested in all agro-agroecological zones except Thika. There were significant differences in phytochemical content and antioxidant activity between the agro-ecologicalzones (p < 0.05) except for the TFC.ConclusionsThe data obtained from this study demonstrated that hydro-alcoholic /methanolic and aqueous maceration systems extracted bioactive compounds from R. officinalis with high potential for applications in industries. The R. officinalis from different agro-ecological zones contained variable phytochemical composition, suggesting that geographical location and climatic conditions influence the biosynthesis and accumulation of secondary metabolites and other bioactive compounds. The data provided in this study will be crucial for processors to select the optimal harvesting season for the extraction of desired bioactive compounds from Rosmarinus officinalis.

Impact of superheated steam roasting on changes in antioxidant and microstructure properties of raw and processed cocoa cotyledon

This research focused on the roasting of cocoa beans at 184 °C for 16 min duration in a superheated steam oven using two separate modes of heating: convection mode and superheated steam mode. After roasting, the antioxidant properties of the cooked cocoa were assessed as ferric reducing antioxidant power activity (FRAP), DPPH radical scavenging activity, total flavonoid content (TFC) and total phenol content (TPC). The micro structural properties of raw and processed cocoa beans were observed using scanning electron microscopy (SEM). As discovered in the scan, conventional roasting showed a nearly complete rapture of the cytoplasmic network system and the destruction of the organelles, whereas superheated steam mode showed satisfactory images. Studies indicated that superheated steam roasting preserved significantly (p < 0.05) greater antioxidant properties as opposed to conventional method of roasting.

Storage stability of texture, organoleptic, and biological properties of goat milk yogurt fermented with probiotic bacteria.

Goat milk is an attractive food due to its high nutritional values, easy digestibility and hypoallergenicity, but has an undesirable "goaty" flavor. In this study, goat yogurt was fermented with four probiotics, respectively, including Lactobacillus acidophilus (GYA), Bifidobacterium animalis (GYB), Lactobacillus casei (GYC) and Lactobacillus plantarum (GYP), and tested for texture, organoleptic, and biological properties during a 4-week storage period at the refrigerated temperature. All goat yogurt with probiotics showed an increase on titratable acidity and a corresponding downward trend on pH value. Viable counts of L. acidophilus and L. casei were above 6 log cfu/mL at the end of the storage, which met the minimum standards for viable probiotic bacteria in yogurt specified by the Food and Agriculture Organization of United Nation (FAO). The texture and organoleptic characteristics of fermented goat milk depended on the strain and the storage period. DPPH free radical scavenging rate and ferric reducing antioxidant power activity gradually increased in all goat yogurts during the storage and yogurt with probiotic bacteria showed higher values than those of GY0. Among all probiotic containing goat yogurts, GYC exhibited the desirable characteristics of hardness, adhesiveness, water holding capacity, antioxidant activity during the whole storage. Furthermore, the addition of L. casei effectively weakened the goaty flavor and enhanced the overall acceptability. Thus, fermented goat milk with L. casei is optional for the development of goat milk product with satisfactory texture properties, pleasant sensory quality and high bioactivity.

Antioxidant, phytochemical composition and proximate analysis of Mangifera haden seeds

Mangifera haden is a tropical fruit that is rich in diverse array of bioactive phytochemicals. The present study was aimed at evaluating the antioxidant capacity, phytochemicals and proximate composition present in aqueous extract and three different fractions of Mangifera haden seeds. Phytochemical analyses were investigated using standard method. The whole sample of Mangifera haden seeds were analyzed for proximate composition using standard analytical methods. The in vitro antioxidant effects of the plant extract and fractions were determined using: FRAP (Ferric Reducing Antioxidant Power), DPPH (2, 2 – Diphenyl – 1 picrylhydrazyl) and TAC (Total Antioxidant Capacity) studies. Proximate composition and calorific value of whole sample of Mangifera haden seeds revealed that the percentage values of moisture, ash, lipid, fibre, protein and carbohydrate were (8.39, 2.77, 17.18, 4.29, 4.82 , 62.55) and 1772.89 kj/100g respectively. Phytochemical constituents of crude extract, ethyl acetate, methanol and n-hexane fractions of Mangifera haden seeds showed that they contain relative amount of flavonoids, phenolics, saponins, tannins, terpenoids, triterpenes, alkaloids and coumarins. All these antioxidant activities increased with increasing concentrations in a dose dependent manner. The in vitro antioxidant studies revealed ethyl acetate fraction with the highest antioxidant activity using FRAP, TAC and DPPH activity while n-hexane fraction exhibited the lowest antioxidant status. These results showed that ethyl acetate fraction of Mangifera haden seeds has high concentration of phytochemical compounds and high amount of antioxidant while n-hexane fraction exhibited the lowest concentration of phytochemical potential and antioxidant status. The phytocomponents of the different fractions of Mangifera haden seeds were investigated using Perkin Elmer GC-MS. The prevailing compounds in ethyl acetate, methanol and n-hexane fraction are 9-Octadecenoic acid (Z)-, methyl ester (15.16 %,), 7-epi-trans-sesquisabinene hydrate (27.86%) and (Z)-Oleic acid (100%).

Agro-Morphological and Biochemical Characterization of Korean Sorghum (Sorghum bicolor (L.) Moench) Landraces

Sorghum landraces are essential for developing cultivars with improved properties, such as disease tolerance, yield and metabolite content. In this study, 139 genotypes (136 Korean sorghum landraces and 3 control cultivars) collected from various provinces were investigated using eleven agronomical and five biochemical traits. The landraces showed little variation in their qualitative agronomical traits. In contrast, quantitative agronomical and biochemical traits differed significantly among the landraces. It was discovered that 16 landraces matured ahead of all control cultivars. Furthermore, 26 landraces had significantly higher thousand seed weights (TSWs) than two of the control cultivars, including Nampungchal (30.63 g) and Sodamchal (30.53 g), whereas only 1 landrace had a significantly higher TSW than the other control cultivar, Wheatland (37.93 g) (p &lt; 0.05). The levels of total tannin content (TTC), total phenolic content (TPC), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium (ABTS) radical cation scavenging activity, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing antioxidant power (FRAP) were in the ranges of 0.12–428.95 mg CE/g, 1.17–10.23 mg GAE/g, 1.64–67.60 mg TE/g, 0.48–31.99 mg AAE/g and 0.63–21.56 mg AAE/g, respectively, and were all affected by collection area, seed weight and seed color. Landraces from northern provinces were discovered to have higher metabolite contents. Furthermore, large seeds had higher TTC and TPC levels as well as DPPH, ABTS and FRAP activities than medium and small seeds, except for the TTC and FRAP, which were significantly different. In terms of seed color, white seeds had significantly lower metabolite contents and antioxidant activities and were notable in principal component analysis. Correlation analysis revealed positive and significant associations between biochemical traits, as well as between panicle-related agronomic traits. In general, the landraces with superior characteristics could be ideal candidates for sorghum breeding programs.

Proximate Composition, Qualitative Phytochemical Screening and In-Vitro Antioxidant Potential of Triumfetta rhomboidea Leaves Extracts

Continuous exploration of medicinal plants for bioactive constituents is essential since the availability and activities of these compounds speaks volume of their possible medicinal benefits. This study evaluated the proximate composition, phytochemical constituents and antioxidant potential of Triumfetta rhomboidea leaf extract. Extraction of aqueous (AETR) and ethanol (EETR) extract were performed by maceration. Proximate composition of pulverized leaf sample was performed following Association of Official Analytical Chemists (AOAC) standards. Antioxidant capacity of extracts were evaluated by determining the total phenolics content (TPC), total flavonoid content (TFC), total antioxidant capacity (TAC), ferric reducing antioxidant power (FRAP) scavenging ability, reducing power (RP) and lipid peroxidation inhibition. Results of proximate analysis revealed 11.01 % moisture content, 3.38 % ash content, 15.15 % crude fiber, 7.34 % crude fat, 61.09 % carbohydrate content, 17.18 % protein content and 379.14 kJ energy value. The total phenol content in aqueous and ethanol extracts were 20.36 ± 0.27 and 12.66 ± 0.28 mg GAE/g, respectively. Total flavonoid was 18.18 ± 1.02 mg QE/g for aqueous and 22.27 ± 0.26 mg QE/g for ethanol extracts with antioxidant capacity of 16.34 ± 4.92 mg AAE/100 g and 48.16 ± 8.50 mg AAE/100 g, respectively. AETR demonstrated highest Fe (II) reducing ability with IC50 of 0.33 ± 0.04 and 0.36 ± 0.04 mg/mL for FRAP and RP activities. This study has demonstrated that T. rhomboidea leave possess biologically active constituents and could presumably perform free radical scavenging activities in reactive oxygen species related diseases. HIGHLIGHTS Triumfetta rhomboidea leaves demonstrated remarkable proximate composition and high energy value The aqueous extract demonstrated high saponin content compared to ethanol extract Aqueous solution (distilled water) has better extraction efficiency of phenolic compounds in leaves of Triumfetta rhomboidea compared to ethanol The aqueous extract exhibited high antioxidant potential compared to ethanol extract as revealed by the ferric reducing antioxidant power and reducing power GRAPHICAL ABSTRACT

Antioxidant Properties of TeNan Herbal Tea Formulation “Telang (Clitoria ternatea) and Pineapple (Ananas comosus)”

Herbal teas was are widely consumed by people around the world have high antioxidant activities. The flavor and color combination of specific teas enriches the aroma and appearance of the tea, producing a tea with fresh color and tastier flavor. This study determines the antioxidant activity of telang flower tea (Clitoria ternatea), pineapple tea (Ananas comosus), and the formula of the combination of telang flower tea and pineapple tea called TeNan. The antioxidant activities of herbal teas were measured by 2,2 Diphenyl-1-picrylhydrazyl (DPPH), Hydrogen Peroxide (H2O2), 2,2′-Azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS), Ferric Reducing Antioxidant Power (FRAP) assay. The total phenol measurement used Gallic Acid Equivalent (GAE), while the flavonoid content measurement used Quercetin Equivalent (QE). The DPPH scavenging activities of telang flower tea, pineapple tea, and TeNan tea (IC50: 17.07%, 11.81%, and 22.22%), H2O2 scavenging activities (IC50: 26.62%, 41.81%, and 96.22%), ABTS-reducing activities (IC50: 2.51%, 3.39%, and 1.02%), and FRAP activities (IC50: 5.56%, 18.67%, and 7.48%). The total phenolic and flavonoid contents of TeNan tea were lower (9.44 μg GAE/100%; 3.46 μg QAE/100% sample concentration) than those of telang flower tea (16.20 μg GAE/100%; 4.88 μg QAE/100% sample concentration) but higher than those of pineapple tea (0.82 μg GAE/100%; 0.17 μg QAE/100% sample concentration). TeNan tea has the higher in ABTS and FRAP activities but lower in H2O2 and DPPH scavenging activities compared to telang flower tea and pineapple tea. In summary, telang tea has stronger antioxidant activity compared to pineapple and TeNan tea in FRAP and H2O2 assays.