DPPH IC50 Research Articles

Phytochemical and Pharmacognostic Study of Hedyotis scandens Roxb. from Mizoram, Northeast India

Hedyotis scandens Roxb. (Family Rubiaceae) is used as a medicinal plant in many communities including Mizoram, northeast India. However, there is little evidence of its therapeutic potential, and scientific proof of its antioxidant capacity is not available to our knowledge and hence, the present study aims to explore the phytoconstituents and curative property of Hedyotis scandens Roxb methanolic leaf extract. Free radical scavenging activity was carried out in vitro. In a concentration-dependent manner, the Hedyotis scandens methanolic leaf extract suppressed the production of ABTS, DPPH and Nitric oxide. The IC50 for DPPH was 35.7±0.14µg/ml, for ABTS it was 50.03±0.12µg/ml and for Nitric oxide the IC50 was 83.61±0.2µg/ml. The presence of compounds such as alkaloid, tannin, flavonoid, and carbohydrate was revealed by phytochemical screening of the plant extract. The total phenolic content was 27.17±0.27 GAE mg/g whereas the total flavonoid content was 29.92±0.3 QE mg/g. The total antioxidant potential of the plant was found to be 98.03±0.14 AE mg/g. Concentration-dependent reducing activity against potassium ferricyanide was seen in the ferric reducing power assay. Antibacterial activity was conducted with two assays and the plant extract showed highest activity against Micrococcus luteus with an inhibition zone of 11.3±0.3mm for 10mg/ml and 15.3±0.3mm for 20mg/ml followed by Escherichia coli at 8.3±0.3mm for 10mg/ml and 10.6±0.3mm, Bacillus subtilis with inhibition zone of 7.3±0.3mm for 10mg/ml and 10.3±0.3mm for 20mg/ml. However, the plant extract did not have any activity against Pseudomonas aeruginosa.

Investigation of the nephroprotective activity of Moringa peregrina leaves aqueous extract in mice

Traditional remedies for Moringa peregrina leaves have a variety of uses with confirmed biological and therapeutic effects, as per published reports. The current study aims to evaluate the ability of the leaves aqueous extract to protect from nephrotoxicity in gentamicin-treated mice. Phytochemical analysis for the aqueous extract was performed using DPPH (2,2-Diphenyl-1-picrylhydrazyl) assay for antioxidants, Folin-Ciocalteu, AlCl3 and HPLC- MS/MS analysis, focusing on phenol and flavonoid content. The nephroprotective activity of the prepared extract was evaluated by means of variable biochemical parameters including Creatinine (Cr), Uric Acid (UA), and Urea (Ur). In addition, histological examination of renal tissues was performed in all mice groups (control, gentamicin-induced (150 mg/Kg i.p) and aqueous extract-orally treated groups (500 and 1000 mg/Kg)). Findings reveal that the prepared extract has total phenols (555.57±0.92mg/g, equivalent to gallic acid), flavonoids (40.08±1.56 mg/g, equivalent to quercetin), and DPPH IC50 (3.10 µg/ml). HPLC-MS/MS analysis revealed the presence of 10 phenols and flavonoids compounds. In vivo studies showed a significant (P < 0.05) reducing effect for the high-dose treatment, on serum and urine concentrations for UA, Cr, and U, among the nephrotoxicity induced mice. Low-dose treated group showed significant reduction on serum concentration of UA, Cr and U, but only for Cr concentration in urine. The histological examination showed an improvement in the image of the renal tissue among the induced-nephrotoxicity mice, which was treated with high-dose extract. In conclusion, leaves aqueous extract of M. peregrina have shown potential protective effect to counteract some of the gentamicin consequences on kidney functions.

Effect of slow-release amylase on extraction of peach peel phenolics and their antioxidant activities

AbstractThe present manuscript demonstrates the work undertaken to optimise and validate a slow-release amylase-assisted extraction of polyphenols from peach fruit peel. A careful investigation and optimisation revealed that peach peel when hydrolysed with 1.50% (w/w) of SRA containing enzyme formulation at 40 °C and 6.1 pH, for 35 min significantly (P < 0.05) increased the extraction yield, levels of polyphenol contents (242.89 ± 1.56 mg gallic acid equivalents – GAE), and coumaric, chlorogenic, ferulic acids or their conjugate esters in extracts. Moreover, the extracts produced through SRA-assisted extraction exhibited ample level of free radical scavenging capacity (DPPH IC50 2.67 ± 0.03 μg mL−1), Trolox equivalent (TE) antioxidant capacity (450.52 ± 24.58 µmol of TE g−1), inhibition of peroxides in linoleic acid (85.68 ± 0.21%), and ferric reducing power of 3.11 ± 0.20 ppm gallic acid equivalents. The results suggested that the incorporation of SRA containing enzyme formulation may enhance the recovery of peach peel polyphenols while hydrolysing the glycosidic linkages without deteriorating their antioxidant character.

The Antioxidant Capacities of Leaf Extracts from Salvia viridis L.

This research was conducted at Yozgat Bozok University to define the antioxidant activity of Salvia viridis L. grown in the field and in vitro conditions. The leaves of the plants grown under field conditions were collected in the pre-flowering period. The leaf extracts prepared with methanol were used in the analysis. DPPH (1,1-Diphenyl-2-picrylhydrazyl) free radical screening activity was used to identify antioxidant activity. The total phenolic, flavonoid, and DPPH IC50 values of S. viridis L. grown in the field and under in vitro conditions were found as 184.15 ± 36.70 mg GAE g-1 and 66.46 ± 0.19 mg GAE g-1, 212.92 ± 11.18 mg QE g-1 and 212.92 ± 11.18 mg QE g-1, 117.51 mg ml-1and 185.40 mg ml-1, respectively. According to the findings of this study, it was determined that leaves of S. viridis L. grown in field conditions exhibited more antioxidant activity than in vitro conditions.

Optimization of Extraction Parameters and Characterization of Tunisian Date Extract: A Scientific Approach Toward Their Utilization.

The online version contains supplementary material available at 10.1007/s12355-022-01223-2.

Chemical profile and biological properties of the essential oil of Thymus atlanticus (Ball) Roussine

Aromatic and medicinal plants are an important source of natural products, including essential oils. These volatile oils are endowed with large spectra of biological and pharmacological properties. The species of Thymus genus belonging to Lamiaceae family produce significant amounts of essential oils with high bioactivity. Thymus atlanticus (Ball) Roussine. (T. atlanticus) is an endemic thyme species that grows in the Moroccan High Atlas Mountains. T. atlanticus, along with other Thymus species, have numerous traditional uses and therapeutic applications in Morocco. Regardless, toxicity, antioxidant, analgesic, and anti-inflammatory properties of the essential oils of this thyme have never been studied before. In this paper, the chemical composition, acute toxicity, antioxidant, analgesic, and anti-inflammatory activities of T. atlanticus are investigated. The results of the chemical composition using GC/MS analysis showed that thymol (23.7%) and carvacrol (22.8%) are the major volatile constituents of this thyme. Moreover, the acute toxicity assessment showed that the essential oil of T. atlanticus is not toxic at 2 g/kg bw. In addition, the oil of this thyme has an important amount of phenolic compounds (6.06 GAE mg/g EO) and a good antioxidant activity (IC50 DPPH = 0.21 mg/ml). The analgesic tests showed that the volatile oil of this thyme induced analgesic effects, suggesting anti-nociceptive actions in both chemical and thermal models of nociception. In addition, T. atlanticus essential oil produced a significant anti-inflammatory effect, as demonstrated by inhibition of ear edema induced by phenol (% of edema was 19.39% for essential oil treatment group compared to 77.59% for edema control group). These findings provide support for the traditional use of T. atlanticus in the Moroccan High Atlas folk medicine. Further investigations are recommended for the possible development of natural antioxidant, analgesic, and anti-inflammatory products from the essential oils of T. atlanticus.

Identification and Characterization of Major Flavonoids in Extracts from an Unexplored Medicinal Herb Orostachys fimbriata

Orostachys species have been recognized as medicinal herbs in East Asia. Although O. fimbriata is known as a traditional medicine, its antioxidant properties have not been investigated compared to other Orostachys species. In this study, we characterized the antioxidant compounds and determined the antioxidant activity of O. fimbriata for the first time. As a result, 1 g of O. fimbriata extracts contains 288.5 ± 7.4 mg polyphenols, which contains 159.7 ± 8.3 mg flavonoids. In particular, 21.6%, 6.6%, and 2.6% of the total flavonoids were identified as epicatechin gallate, quercetin, and kaempferol, respectively, by LC-MS system. The DPPH IC50, ABTS IC50, and FRAP value of the extracts was determined to be 27.6 ± 5.5 μg/mL, 125.7 ± 6.0 μg/mL, and 115.0 ± 4.4 mmol/L, respectively. These activities were 30–57% of the positive control, ascorbic acid. In conclusion, it was demonstrated that O. fimbriata has outstanding antioxidant properties. This study highlights the need for further investigations toward in-depth research on the pharmacological functions of O. fimbriata.

Assisted Extraction with Cyclodextrins as a Way of Improving the Antidiabetic Activity of Actinidia Leaves.

Five varieties of Actinidia leaves (Geneva, Jumbo, Ken's Red, Kijivska Hibridna, and Sentyabraskaya) were analyzed. The profiles of active compounds were determined, namely quercetin, rutin, epicatechin, chlorogenic acid, and kaempferol, in the raw material. Suspecting that the raw material might prove important in the treatment of diabetes, the authors assessed the antioxidant activity and the ability to inhibit enzymes responsible for the development of diabetes (α-glucosidase and α-amylase). As a result of the conducted analysis, the Ken's Red variety was indicated as having the highest biological activity (DPPH IC50 = 0.332 ± 0.048; FRAP IC0.5 = 0.064 ± 0.005; α-glucosidase inhibition IC50 = 0.098 ± 0.007; α-amylase inhibition IC50 = 0.083 ± 0.004). In order to increase the efficiency of the extraction of active compounds from Ken's Red variety leaves, cyclodextrins (α-CD, β-CD, and γ-CD) were used as extraction process enhancers. The obtained results showed a significant increase in the contents of extracted active compounds. In addition, the type of CD used enhanced the extraction of selected compounds (quercetin, kaempferol, rutin, chlorogenic acid, and epicatechin. This study shows that the application of cyclodextrin-based extraction significantly improved the leaf activity of the Ken's Red variety (DPPH IC50 = 0.160 ± 0.019; FRAP IC0.5 = 0.008 ± 0.001; α-glucosidase inhibition IC50 = 0.040 ± 0.002; α-amylase inhibition IC50 = 0.012 ± 0.003).

Spatial Variation of Phytochemical and Antioxidant Activities of Olive Mill Wastewater: A Chemometric Approach

Olive mill wastewater (OMW) was obtained during the extraction of olive oil. It is typified by an elevated concentration of sugars, acids, proteins, polyphenols, and organic matter. This makes the removal of OMW problematic for all olive oil-producing countries. Due to their high concentration in polyphenols, these wastewaters are a source of danger to the environment. This research aimed to study the spatial distribution effect in terms of geographical origin production of olive oil on the phenolic content and the antioxidant activity of the OMWs. A chemometric approach using principal component analysis (PCA) and hierarchical cluster analysis (HCA) was utilized. Physico-chemical characterization of OMWs was performed to evaluate their pollutant load by setting the following parameters: pH, dry matter, conductivity, and chemical oxygen demand. Quantitative analysis of the phenolic compounds shows that the extract of all samples had a high content of phenolics varying from 238.26 ± 5.67 to 534.16 ± 3.83 mg GAE/g of extract, flavonoids varying from 179.89 ± 1.64 to 421.47 ± 3.42 mg QE/g of extract, and tannins varying from 101.66 ± 0.65 to 216.28 ± 3.41 mg CE/g of extract. Antioxidant activity was determined by two testing systems: DPPH and ABTS assay. The IC50 DPPH varied from 0.30 ± 0.08 to 1.93 ± 0.34 µg/mL, while it varied between 2.04 ± 0.16 and 6.11 ± 0.25 µg/mL for the IC50 ABTS method. The principal component analysis indicated that the two methods DPPH and ABTS are strongly correlated. Furthermore, important correlations were shown by the principal component analysis (PCA) on the one hand between the phenolic compounds and on other hand between their antioxidant activities (DPPH, ABTS).

Innovative and Green Extraction Techniques for the Optimal Recovery of Phytochemicals from Saudi Date Fruit Flesh

Saudi Arabia is one of the major producers of date (Phoenix dactylifera) fruit. Date fruit flesh is considered a healthy food due to the presence of natural antioxidants. Green and innovative supercritical fluid (SFE, 52.5 °C temperature, 27.50 MPa pressure, 5 mL CO2/min flow rate) and subcritical (SubCO2, 250 extraction cycles, 29 °C temperature, 6.8 MPa, 12 h, ethanol solvent) extraction techniques were used to produce flesh extracts from four Saudi date fruits (Sukari (SKFE), Ambara (AMFE), Majdool (MJFE) and Sagai (SGFE)), and extracts prepared using 6 h Soxhlet extraction at 70 °C for 16 h using n-hexane as solvent, were taken as control. SFE produced the highest (p < 0.05) extract yields, whereas the SubCO2 method recovered significantly higher (p < 0.05) amounts of phytochemicals. Total phenolics (186.37–447.31 mg GAE/100 g), total flavonoids (82.12–215.28 mg QE/100 g), total anthocyanins (0.41–1.34 mg/100 g), and total carotenoid (1.24–2.85 mg BCE/100 g) were quantified in all the flesh extracts. The biological properties evaluation showed that flesh extracts had high antioxidant (17.79–45.08 µg AAE/mL), antiradical (191.36–34.66 µg/mL DPPH IC50), ferric-reducing (2.18–5.01 mmol TE/100 g) and ABTS-scavenging (444.75–883.96 µmol TE/100 g) activities. SubCO2 was the best technique and Majdool the best date variety, in terms of both phytochemicals and biological properties.

Characteristics and Antioxidant Activities of Kombucha from Black Tea and Roselle by a Mixed Starter Culture

Kombucha is a functional beverage fermented by the symbiosis of bacteria and yeasts and is comprised mainly of bioactive compounds and acids that have beneficial health effects. Our research aimed to determine the optimal ratio of co-culture of the bacterium Acetobacter pasteurianus AJ605 and the yeast Zygosaccharomyces bailii YN403 for kombucha fermentation in order to improve the consistency of kombucha quality so that it can be mass produced. Microbial growth, chemical characteristics, and antioxidant activities of kombucha during fermentation were analyzed. The results showed that a co-culture ratio of 8:2 (v/v) of A. pasteurianus AJ605 and Z. bailii YN403 gave the highest antioxidant activity after 10 days of fermentation, with a DPPH IC50 value of 25.76 µl/mL and an ABTS IC50 value of 8.84 µl/mL. The co-culture ratio of 8:2 showed antioxidant activity that was not significantly different (p>0.05) from that of SCOBY (symbiotic culture of bacteria and yeasts) alone. Additionally, during fermentation, the pH of kombucha decreased to 3.16, with increases in titratable acidity and alcohol content of 7.00 g/L and 7.96 g/L, respectively. To enhance the antioxidant activity and taste quality of kombucha, black tea and roselle were mixed at various ratios and inoculated with 10% (v/v) optimal co-culture. The results showed that a high antioxidant activity was obtained using an 8:2 (w/w) ratio of black tea and roselle, at day 10 of fermentation, with a DPPH IC50 value of 23.88 µl/mL and ABTS IC50 value of 6.11 µl/mL. Moreover, the results indicate that kombucha from black tea and roselle can be a functional beverage that has high antioxidant activity and sensory acceptability.

Physicochemical Antioxidative and Emulsifying Properties of Soybean Protein Hydrolysates Obtained with Dissimilar Hybrid Nanoflowers.

This study investigated the changes in the structure and properties of soybean protein after hydrolysis using two types of hybrid nanoflowers (alcalase@Cu3(PO4)2•3H2O (ACHNs) and dispase@Cu3(PO4)2•3H2O (DCHNs)) and examined the basic properties and oxidative stability of hydrolyzed soybean protein emulsions. The formations of the two hybrid nanoflowers were first determined using a scanning electron microscope, transmission electron microscope, and Fourier infrared spectroscopy. The structure and functional properties of soybean protein treated with hybrid nanoflowers were then characterized. The results indicated that the degree of hydrolysis (DH) of the ACHNs hydrolysates was higher than that of the DCHNs for an identical reaction time. Soybean protein hydrolysates treated with two hybrid nanoflowers showed different fluorescence and circular dichroism spectra. The solubility of the hydrolysates was significantly higher (p < 0.05) than that of the soybean protein (SPI) at all pH values tested (2.0-10.0)*: at the same pH value, the maximum solubility of ACHNs hydrolysates and DCHNs hydrolysates was increased by 46.2% and 42.2%, respectively. In addition, the ACHNs hydrolysates showed the highest antioxidant activity (DPPH IC50 = 0.553 ± 0.009 mg/mL, ABTS IC50 = 0.219 ± 0.019 mg/mL, and Fe2+ chelating activity IC50 = 40.947 ± 3.685 μg/mL). The emulsifying activity index of ACHNs and DCHNs hydrolysates reached its maximum after hydrolysis for 120 min at 61.38 ± 0.025 m2/g and 54.73 ± 0.75 m2/g, respectively. It was concluded that the two hydrolysates have better solubility and antioxidant properties, which provides a theoretical basis for SPI product development. More importantly, the basic properties and oxidative stability of the soybean-protein-hydrolysates oil-in-water emulsions were improved. These results show the importance of proteins hydrolyzed by hybrid nanoflowers as emulsifiers and antioxidants in the food and pharmaceutical industry.

Assessment of total phenolic, total flavonoid, metal contents and antioxidant activities of Trametes versicolor and Laetiporus sulphureus

Antioxidant activities, metal contents, total phenolics and flavonoids were analyzed for Trametes versicolor and Laetiporus sulphureus collected from Kastamonu region by using ICP-OES and spectrophotometric methods. Antioxidant activity of mushroom extracts were expressed as percentage of DPPH radicals inhibition and IC50 values. Percentage of inhibition ranged from 15.83 to 61.03% and IC50 value was found 5.33 mg/mL for L. sulphureus and % inhibition ranged from 7.27 to 20.47% and IC50 value was found 18.10 mg/mL for T. versicolor. The content of phenols in methanolic extracts expressed in gallic acid equivalents varied between 77.41±1.10 and 272,70±2.26 mg/g for T. versicolor and L. sulphureus respectively. Also the content of flavonoids in methanolic extracts expressed in quercetin equivalents varied between 13.82±0.21 and 44.29±0.54 mg/mg for T. versicolor and L. sulphureus, respectively. As a result the significant linear correlation was corroborated between the values for the total phenolic content and antioxidant activity of this mushroom. In addition, all samples were analyzed by ICP-OES to obtain the concentration of Co, Cu, Cd, Pb, Ni, Cr, Na, Ca, Al, Fe, Zn, Ba, P, Mg, As, Mn and B. While maximum and minimum metal contents of mushrooms were found as mg/kg for Na (1.88-2.09), Mg (4.59-6.77), P (17.11-24.52), Ca (0.49-23.91) and Fe (0.49-3.84), the maximum and minimum trace metal contents of mushrooms were found as µg/kg for Cr (8.23-35.27), Ni (41.51-180.99), Cu (36.36-123.93).

Recovery of oils and antioxidants from olive stones

The olive oil industry generates enormous amounts of olive stones each year, which have the potential to be used as a biofuel but have high oil content, which negatively impacts the combustion process. In addition, olive stones contain high-value antioxidants, and their exploitation can provide additional revenues for the biofuel industry.In this work, we report the effect of different extraction solvents on the extraction of antioxidants and their activity. In addition, in vitro gastrointestinal digestion was used to evaluate the content and antioxidant activity of the olive stone extracts after gastrointestinal digestion. The extracts obtained by aqueous ethanol solvent (50% vol) exhibited the highest antioxidant activity with the DPPH IC50 of 1.27 mg mL−1 and ferric reducing antioxidant power (FRAP) of 6.33 mg AAE g−1. After in vitro digestion composed of gastric and intestinal processes, the antioxidant activity of olive stones decreased: DPPH IC50 value increased three times (a higher value of IC50 indicates lower antioxidant activity) and FRAP decreased almost five times with respect to the values obtained for original extracts.Furthermore, both phenomenological and shrinking core models were used to fit experimental oil extraction kinetics data and showed good agreement. Thermodynamic analysis showed that the extraction process is endothermic and irreversible while spontaneous and thermodynamically favourable for all conditions except for oil extraction from olive stones of 3.10 mm particle size at 20 °C. The calculated value for temperature coefficient is in good agreement with the previously reported values for the oil extraction from similar biomass.

Cytoprotective, antimutagenic/antirecombinogenic and antibacterial properties of Lallemantia iberica extracts.

Plants have important chemical compounds to protect organisms from many mutagens but they may also have dangerous toxic substances that must be tested before use. Lallemantia iberica has been used by local people for treatment of some diseases but it was never tested for its cell protective and antimutagenic/antirecombinogenic properties. In this study, it was aimed to determine the cytoprotective, antimutagenic/antirecombinogenic, antibacterial, antioxidant and phenolic profile of L. iberica by MTS assay, micronucleus test/somatic mutation recombination test (SMART), disc diffusion method, ABTS/DPPH tests and liquid chromatography (LC), respectively. MTS assay results showed that both of the extracts supported the normal growth of healthy human lymphocytes and there was no significant difference between extracts. Although there was no significant increase in micronucleus concentration (‰) of the cultures treated with ethanol or methanol extracts, methanol extract caused slightly lower micronucleus concentration (12.64 ± 3.65‰) than the ethanol extract (24.46 ± 4.50‰). SMART results showed that ethanol and methanol extracts prevented harmful mitotic recombination. Lallemantia iberica also showed antibacterial activity against all of the strains tested, and the largest inhibition zones were observed with Pseudomonas aeruginosa (17.9 mm) and Enterobacter aerogenes (13.8 mm). Methanol extracts showed better antioxidant activities (ABTS IC50 : 104.07 μg mL-1 , DPPH IC50 : 58.8μg mL-1 ) than ethanol extracts (ABTS IC50 : 344.03 μg mL-1 , DPPH IC50 : 233.7μg mL-1 ). According to the LC results, the most abundant phenolic compounds were rutin hydrate (1796.4 ± 62.9mg kg-1 ) and p-coumaric acid (228.1 ± 7.60 mg kg-1 ). Lallemantia iberica extracts had cell-protective, antimutagenic/antirecombinogenic, antibacterial and strong antioxidant characteristics in relation to their rich phenolic content. © 2022 Society of Chemical Industry.

Chemical Identification and Antioxidant Screening of Bufei Yishen Formula using an Offline DPPH Ultrahigh-Performance Liquid Chromatography Q-Extractive Orbitrap MS/MS.

Chronic obstructive pulmonary disease (COPD) has high morbidity and mortality and presents a threat to human health worldwide. Numerous clinical trials have confirmed that Bufei Yishen formula (BYF), an herbal medicine, can alleviate the symptoms of COPD by reducing oxidative stress-mediated inflammation. However, the active components of BYF remain unclear. We developed an efficient ultrahigh-performance liquid chromatography Q-Extractive Orbitrap mass spectrometry method to identify the composition of BYF and determine its antioxidant profile through an offline screening strategy based on 1,1-diphenyl-2-trinitrophenylhydrazine (DPPH)-liquid chromatography-mass spectrometry. In total, 189 compounds were identified in BYF extract, including 83 flavonoids, 24 lignans, 20 alkaloids, 15 saponins, 11 terpenoid, 10 saccharides, eight lipids, seven organic acids, two coumarins, two amino acids, and seven other compounds. Among them, 79 compounds were found to have a potential antioxidant activity. In vitro validation indicated that the free radical scavenging activities of rosmarinic acid and calycosin were similar to that of the positive control (DPPH IC50 = 25.72 ± 1.02 and 147.23 ± 25.12 μg/mL, respectively). Furthermore, calycosin had a high content in serum after the oral administration of BYF, indicating that calycosin might be the major antioxidant compound in BYF.

Chemical Profile and Antioxidant Activity of Essential Oils and Polyphenolic Compounds of Lippia Graveolens from Different Mexican Localities

Extraction of polyphenolic fraction and essential oils (EOs) from Lippia graveolens (Mexican oregano) leaves were explored using innovative and conventional extraction techniques such as ultrasound assisted extraction (UAE) and steam distillation, respectively. The metabolites were further analyzed to evaluate their bioactivity as antioxidants and the identification of the chemical profile was performed using a UPLC-ESI-Q/TOF-MS2 and GC-MS. The antioxidant assays on EOs showed potential as inhibitors of lipid oxidation, and the polyphenolic fraction obtained higher inhibition activity against DPPH• radical. The lower IC50 for DPPH• radical corresponded to the phenolics from “San Pedro” with 545.40 ± 47.2 μg mL-1, and the higher inhibition of lipid oxidation appertained to EOs (99.06 ± 3.91%). Furthermore, the GC-MS tentative characterization identified sixty-one compounds for EOs, and UPLC-ESI-Q/TOF-MS2 showed six identified compounds, the tentative compounds englobe flavonoids, terpenes, sesquiterpenes xanthines, and dicarboxylic acid. The present study demonstrated that Mexican crops of L. graveolens possess essential oils and polyphenolic fractions with strong antioxidant activity, which might be useful in the food and pharmaceutical industries.

Antioxidant, Anticancer, Antibacterial, Antibiofilm Properties and Gas Chromatography and Mass Spectrometry Analysis of Manuka Honey: A Nature’s Bioactive Honey

Honey has a history of medical use and is known as bio-alternative therapy. This research assessed the phytochemical and biological activity of the medical grade manuka honey (MH). Gas chromatography–mass spectrometry (GC–MS) was chosen to investigate bioactive compounds of the MH. The DPPH and ABTS free radical scavenging and beta-carotene antioxidant activities as well as the antibacterial and antibiofilm effects against S. aureus, B. subtilis, E. coli and P. aeruginosa were all determined. Furthermore, to gauge anticancer properties of MH, a MTT assay was opted towards three cell lines, including HCT-116 (colon), A549 (lung) and MCF-7 (breast) cancer cells. The GC–MS analysis of the tested MH revealed the identification of various chemical constituents belonging to the fatty acids, phenols, and esters. The MH was found to have higher reducing power activity (DPPH IC50: 7.36; ABTS IC50: 4.49 mg/mL) than the beta-carotene bleaching power (IC50: 37.51 mg/mL). Similarly, the MH was noted to be more active against the planktonic and biofilm of Gram-positive bacteria. Furthermore, a dose-dependent anticancer potential was observed, although a significant anticancer potential was pointed out against the MCF-7 and A549 cell conforming to the IC50 values of 9.05 and 9.37 mg/mL, respectively. This study’s results have highlighted the MH’s chemical composition with significant bioactivities.

Extract with high 1,1-diphenyl-2-picrylhydrazyl (DPPH) inhibitory capability from pericarp and seed of mangosteen (Garcinia mangostana L.) using microwave-assisted extraction (MAE) two-phase solvent technique

The human body needs compounds that are antioxidants to prevent oxidative stress. Some parts of the mangosteen fruit (Garcinia mangostana L.) have been known as sources of bioactive compounds that have antioxidant properties. The pericarp and seeds of mangosteen were extracted using the MAE method to produce the extract with the greatest antioxidant activity. There are two types of solvent mixtures used in the extraction process: single-phase and two-phase solvents. The solvents used were ethanol (EtOH), ethyl acetate (EtOAc), isopropyl alcohol (IPA), and water. First, utilizing dried mangosteen pericarp powder as the raw material, a study was undertaken to determine the ideal operating conditions for the MAE process. A one-factor-at-a-time approach was used to find the best operating conditions. A mixture of solvents with varied ratios (mL/mL), extraction temperature (°C), extraction time (min), and solid to solvent ratio (g/mL) were applied as independent variables. Then, dried mangosteen seed powder extraction was carried out based on the best-operating conditions previously achieved. The DPPH scavenging activity, total phenolic content (TPC) value, and α-mangostin content of the two extracts were compared. It was discovered that the mangosteen pericarp extract showed higher antioxidant activity (IC50 DPPH = 9.40 µg/mL) than the mangosteen seed extract (IC50 DPPH = 37.54 µg/mL), even slightly better than ascorbic acid (IC50 DPPH = 10.47 µg/mL). The best extract was produced from the bottom phase of two-phase solvent system (EtOAc:EtOH:Water 2:1:2), with an MAE temperature of 50 °C, a time of 4 min, and a solid-to-solvent ratio of 1:16. The TPC value of the best extract is 903.54 mgGAE/g extract, with a yield of 16.53 % and an α-mangostin concentration of 0.11 %.

Insight into the antioxidant activities of ten Fabaceae plant species that are medicinally used by the Aucan Tribal Peoples from the Republic of Suriname (South America).

Fabaceae are associated with a high antioxidant activity (AA) and a high total phenolic (TPC), total flavonoid (TFC), and selenium content (SeC). In this study, the aqueous extracts from ten Fabaceae species that are medicinally used by the Aucan Tribal Peoples from Suriname (South America), were evaluated for AA using a DPPH and a FRAP assay, and for TPC, TFC, and SeC using Folin-Ciocalteu's, an AlCl3 colorimetric, and an azure B-based method. Associations between pairs of these variables were determined by Pearson correlation coefficient. One-way ANOVA with post-hoc Tukey's test was used to evaluate the data for statistically significant differences (p < 0.05). The I. stipularis (bark), C. guyanensis (bark), A. jupunba (twigs), and M. urens (fruit) extracts had the highest DPPH IC50 values (36 - 70 μg/mL) and FRAP values (346 - 573 μM FeE/100 μg) and the highest TPC (25 - 41 GAEq/100 μg), TFC (21 - 39 REq/100 μg), and SeC (4 -17 μg/g). The values for the T. indica (leaf), P. macroloba (bark), M. pigra (whole plant), S. quinquangulata (leaf), A. sensitiva (whole plant), and L. leucocephala (leaf) extracts were > 10-fold lower. AA, TPC, TFC, and SeC correlated well with each other (correlation coefficient ≥ 0.83, p ≤ 0.0030). Thus, AA, TPC, TFC, and SeC may represent important determinants of the health benefits of the former four samples but not of the others. Future studies should focus on the precise contribution of AA, TPC, TFC, and SeC to the therapeutic value of medicinal Fabaceae.