Total Flavonoid Compounds Research Articles

Inhibition of Nε-(carboxymethyl)lysine and Nε-(carboxyethyl)lysine formation in air-fried beef tenderloins marinated with concentrated cranberry juice

The aim of this study was to investigate the effect of marinating beef tenderloin with concentrated cranberry juice on the formation of Nε-(carboxymethyl)lysine (CML) and Nε-(carboxyethyl)lysine (CEL). In order to achieve this, the concentrated cranberry juice was prepared from cranberry fruit and characterised. Subsequently, beef tenderloins were marinated at two different concentrations (25% and 50%) and three different marination times (2, 6 and 24 h), after which they were cooked in an airfryer at 200 °C for 12 min. Following the cooking process, CML, CEL, thiobarbituric acid reactive substances (TBARS) and colour were analysed. It was found that concentrated cranberry juice has high phytochemical and bioactivity properties. Cranberry juice was found to be high in total phenolic compounds (TPC), total flavonoid compounds (TFC), antioxidant activity and rich in bioactive compounds. It was found that cranberry juice significantly altered the colour properties (L*, a*, and b*) of raw beef tenderloin samples (p < 0.05). It was observed that increasing the concentration and time of the marinade significantly inhibited the formation of CML (p < 0.05), but that it did not significantly inhibit the formation of CEL (p > 0.05). As the concentration*time interaction increased from the control variable, the level of CML decreased (p < 0.01). This interaction inhibited CML by up to 12.39 μg/g, reducing it to 1.2 μg/g. An interaction between CML and TBARS and pH values was identified. In conclusion, marinating beef tenderloin with concentrated cranberry juice effectively inhibits the formation of CML while stabilising the formation of CEL, demonstrating its potential as a strategy to mitigate the formation of advanced glycation end products (AGEs) in meat products.

Antioxidant and antibacterial properties of stingless bee (Meliponula spp.) honey from the northern highlands of Tanzania, in comparison with Apis mellifera honey

Meliponiculture is an emerging practice in Africa where beekeeping is dominated with the management of the honey bees, Apis mellifera. Nevertheless, communities in the northern highlands of Tanzania have a long history of managing stingless bees for their honey which has putative medicinal value. The current study aimed to evaluate the antioxidant and antibacterial properties of honey samples from two stingless bee species, namely Meliponula (Axestotrigona) ferruginea and Meliponula (Axestotrigona) togoensis, in comparison with A. mellifera honey. Physicochemical properties were also determined to assess the quality of the studied honey samples. The honey samples conformed with the regional quality standards for moisture content, free acidity and HMF for both stingless bee and A. mellifera honey. Stingless bee honey exhibited stronger antioxidant potency, displaying higher mean values of total flavonoid (54.12 – 56.40 mg QE/100 g) and phenolic compounds (81.92 – 87.56 mg GAE/100 g), DPPH radical scavenging activity (65.81 – 68.40%) and ferric reducing antioxidant power (109.78 – 126.64 µmol Fe (II)/100 g) compared to A. mellifera honey (33.17 mg QE/100 g, 61.13 mg GAE/100 g, 41.44%, 65.00 µmol Fe (II)/100 g, respectively). Additionally, stingless bee honey demonstrated higher inhibitory effect against Staphylococcus aureus, Bacillus subtilis and Salmonella typhi, with minimum inhibitory concentrations ranging from 0.16 – 5% v/v, compared to 2.5 – 20% v/v for A. mellifera honey. These findings highlight the distinct bioactive properties of stingless bee honey and validate its applications in traditional therapy. More studies are encouraged to elucidate specific bioactive ingredients in stingless bee honey to further substantiate its medicinal potency.

“GC-MS profiling, sub-acute toxicity study and total phenolic and flavonoid content analysis of methanolic leaf extract of Schima wallichii (D.C.) Korth-a traditional antidiabetic medicinal plant”

Ethnopharmacological relevanceSchima wallichii (D.C.) Korth is traditionally used in Manipur, India for treatment of diabetes and hypertension. However, there is no data reported regarding safety profile of this medicinal plant upon repeated per oral administration over a period of time. Aim of the studyIn the current study phytochemical profile, toxicological profile and total phenolic and flavonoid compound content of Schima wallichii leaves extract were evaluated. Materials and methodsGas chromatography coupled to mass spectrometry was performed for chemical profiling by using Gas Chromatography-Mass Spectrometry/Mass Spectrometry (GC-MS/MS), Shimadzu, TQ8040 system. A 28 days sub-acute toxicity study was carried out using albino Wistar rats by administering 3 different doses (200, 400 and 800 mg/kg body weight per oral) of methanol leaves extract. Changes in body weights were recorded weekly. Serum biochemical parameters were estimated as well as blood-cell count was done to check the effect of extract on haematopoietic system. Histopathology of vital organs viz. kidney, heart, brain, liver was performed to find any pathological indications. Since, liver is main the site for xenobiotic metabolism, estimation of the level of glutathione, catalase and lipid peroxidation were done. Further, total phenolic and flavonoid compound content estimation was performed for the leaves extract. ResultsGC-MS revealed 14 major compounds with area percentage >1% of which quinic acid, n-Hexadecanoic acid, 9,12,15-Octadecatrienoic acid, (Z,Z,Z)-, Octatriacontyl trifluoroacetate, are three major compounds. No mortality was observed after the treatment with extract. Blood-cell count and biochemical parameters didn't show significant deviation as compared to control group. Histopathology study of vital organs viz. (liver, kidney, heart and brain) showed normal cellular construction comparing to control group. There was no sign of membrane lipid peroxidation, depletion of catalase level and glutathione level in liver. The result demonstrates that NOAEL (no-observed-adverse-effect levels) in the sub-acute toxicity was above 800 mg/kg. The leaves extract showed significant total phenol and flavonoid content. ConclusionThe present study revealed that Schima wallichii possessed important bioactive compounds with therapeutic values. The plant was safe for consumption after repeated high doses administration in rats and possesses significant amount of total phenol and flavonoid content.

Encapsulation of propolis extracted with methylal in the chitosan nanoparticles and its antibacterial and cell cytotoxicity studies

In this study we develop novel type of antibacterial chitosan-propolis NPs to improve theantimicrobial activity against various pathogens. To this aim, we primarily extracted propolis with methylal and ethanol as green solvents and its encapsulation with chitosan NPs. The developed propolis loaded chitosan NPs indicated antimicrobial and anti-biofilm properties against various gram positive and negative. FTIR revealed the successful encapsulation of the propolis extract with Ethanol (PE) and Methylal (PM) into the chitosan nano career matrix. HPLC and GC-MASS also confirmed the presence of flavonoids and phenols compounds of propolis extracted with both solvents. In addition, we confirmed the total phenolic and flavonoid compounds in propolis by calorimetric method of Folin–Ciocalteu and aluminum trichloride complex formation assays, respectively. PE-CH and PM-CH were optimized regarding physicochemical properties such as particle size, zeta potential, and poly dispersity index (PDI) index. DLS and SEM micrographs confirmed a spherical morphology in a range of 360–420 nm with Z potential values of 30–48 mV and PDI of 0.105–0.166 for PE-CH and PM-CH, respectively. The encapsulation efficiency was evaluated using colorimetric analysis, with median values ranging from 90 to 92%. The MIC values within the range of 2 to 230 µg/ml and MBC values between 3 to 346 μg/ml against both gram-positive and negative bacteria. While both PE and PM showed a significant reduction in the number of E. coli, S. aureus, and S. epidermidis, the use of PE-CH and PM-CH led to a statistically significant and greater reduction in number of E. coli, S. aureus, and S. epidermidis strains on the biofilm, pre-formed biofilm and planktonic phases. Besides, the DPPH assay showed significant antioxidant activity for these NPs within the range of 36 to 92%. MTT assay for MHFB-1, HFF, L929, MDF, and MCF-7 cells exhibited statistically significant differences in each other that show the IC50 between 60–160 µg/ml for normal cells and 20 for cancer cells. Finally the present study indicated that both PM and PM-CH greater than PE and PE-CH in which contain high flavonoid and phenolic contents with a high antioxidation potential antioxidant properties, which could be beneficial for cell proliferation and antibiotic and anticancer applications.

Evaluation of the content of polyphenols, flavonoids and tannins, the antioxidant capacity, and the antimicrobial activity of different organic and aqueous fractions of stems of Retama monosperma

Retama monosperma is an endemic plant of the Mediterranean region that has been traditionally used in folk medicine to treat various ailments. It contains a variety of bioactive phytochemicals and exhibited several biological activities. This study aimed to assess the phytochemical screening, total phenolic, total flavonoid, and total tannin compounds, as well as the antioxidant capacity and antimicrobial activity. The phytochemical screening involved color reactions, characteristic reagents, and precipitation methods. Total phenolic, flavonoid, and tannin compounds were quantified using colorimetric methods across four fractions. Antioxidant capacity was assessed using 2,2-Diphenyl-1-picrylhydrazyl radical scavenging, ferric reducing antioxidant power, 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging, and phosphomolebdenum assay. The antimicrobial activity was evaluated through disc diffusion method and the microdilution assay. Qualitative phytochemical tests revealed the presence of flavonoids, tannins, terpenoids, alkaloids, and sterols. Quantification of total phenolic, flavonoid, and tannin compounds confirmed the richness of polyphenolic compounds in all fractions. The antioxidant capacity measurements revealed that the ethanol fractions exhibited the highest antioxidant capacity in 2,2-Diphenyl-1-picrylhydrazyl, ferric reducing antioxidant power assays, and phosphomolebdenum assay. Conversely, the aqueous fraction showed highest activity in the 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) assay. Regarding antimicrobial activity, the ethyl acetate fraction demonstrated superior efficacy against Staphylococcus aureus, and Bacillus cereus. These findings suggest that R. monosperma could serve as a valuable source of antioxidant and anti-infective phytocompounds.

The Quality Evaluation of Avocado Fruits (Persea americana Mill.) of Hass Produced in Different Localities on the Island of Tenerife, Spain.

The effect of the production area on the quality of Hass avocados grown on the island of Tenerife was studied. For this purpose, several physicochemical parameters, such as fruit weight, percentage of pulp, seed and skin, proximate composition, minerals, total phenolic compounds (TP), total flavonoid compounds (TF), α-tocopherol, antioxidant capacity, and fatty acid profile were analyzed. The location of the orchards significantly influenced avocado weight; pulp and seed percentage; and fat, fiber, ash, α-tocopherol, TP, phosphorus, potassium, calcium, iron, zinc, and oleic and palmitoleic acid contents. Buenavista (BU) avocados were the smallest (185 g) and presented the highest percentage of pulp (77.1%) and lowest percentage of fiber (5.43%). The highest levels of dry matter (33.8%) and fat (20.4%) were found in avocados harvested in Los Silos (SI) and Santiago del Teide (SA), respectively. Compared with those at the other locations, the avocados harvested in Güímar (GU) had high levels of α-tocopherol (52.2 µg g-1) and phenolic compounds (56.0 mg GAE 100 g-1). Avocados from Los Realejos (RE) had the highest percentage of oleic acid and the lowest percentage of palmitoleic acid. Numerous significant correlations were found between the variables studied, especially those between TP, TF, and antioxidant capacity (DPPH) and between fat percentage and dry matter.

Phenolic Compounds in Berries of Winter-Resistant Actinidia arguta Miq. and Actinidia kolomikta Maxim.: Evidence of Antioxidative Activity.

Variations between fruit cultivars can significantly impact their biochemical composition. The present research examined the variability in the qualitative and quantitative content of phenolic compounds in berry extracts of Actinidia kolomikta and Actinidia arguta cultivars. Additionally, antioxidant activities of berry extracts were evaluated. The total phenolic, flavonoid, proanthocyanidin contents and hydroxycinnamic acid derivatives were determined using the appropriate methodologies. The average amount of phenolic compounds in A. kolomikta berries (177.80 mg/g) was three times higher than that of A. arguta (54.45 mg/g). Our findings revealed that berries of A. kolomikta and A. arguta accumulated, on average, 1.58 RE/g DW (rutin equivalent/g dry weight) and 0.615 mg RE/g DW of total flavonoids, 1439.31 mg EE/g DW (epicatechin equivalent/g dry weight) and 439.97 mg EE/g DW of proanthocyanidins, and 23.51 mg CAE/g DW (chlorogenic acid equivalent/g dry weight) and 5.65 mg CAE/g DW of hydroxycinnamic acid derivatives, respectively. The cultivars of both species were characterized by higher antioxidant activity of total phenolic compounds determined using CUPRAC and FRAP methods compared to the ABTS•+ method. The variability in phenolic compounds' qualitative and quantitative content in tested berry extracts was evaluated by applying ultra-high performance liquid chromatography (UHPLC) coupled to mass spectrometry in tandem with electrospray ionization. Significant intraspecific differences in the amounts of total phenolic compounds, total flavonoid compounds, proanthocyanidins, and hydroxycinnamic acid derivatives were determined among cultivars. Four phenolic acids, eight flavonols, two flavones, and five flavon-3-ols were identified in the berry extracts.

The Effect of Different Grape Varieties and Adding Different Ratios of Mustard Seeds on the Phenolic Compounds, Antioxidant Capacity, and Bioaccessibility Values of Hardaliye under In Vitro Digestion

Hardaliye, grape-based fermented beverage, rich in antioxidant phenolic compounds. Bioaccessibility and antioxidant capacity of bioactive compounds in hardaliye, produced using varying amounts of mustard seeds (1%, 1.5%, and 2%) with Merlot and Papazkarası grape varieties, were evaluated under in vitro gastrointestinal digestion conditions. After digestion, Merlot and Papazkarası samples with 2% addition of mustard seed showed significantly higher total phenolic compounds (TPC) (358.48±14.73 and 89.01±2.42 mg GAE/L, respectively) compared to other samples (P&lt;0.05). 2% mustard seed added Merlot samples resulted in the highest 1,1-diphenyl-2-picrylhydrazyl (DPPH) and cupric reducing antioxidant capacity (CUPRAC) values (19.06±3.91 and 9.96±1.83 mmol TEAC/L, respectively) which differed significantly from other samples (P&lt;0.05). The Merlot sample with 2% addition of mustard seed showed significantly higher TPC, total flavonoid compounds (TFC), DPPH, and CUPRAC bioaccessibility values compared to other Merlot samples (P&lt;0.05). For Papazkarası samples with 2% mustard seed addition, significant differences were observed only in terms of TPC and TFC bioaccessibility values (15.87±2.30% and 15.27±1.29%, respectively) compared to samples with 1% and 1.5% mustard seed addition (P&lt;0.05). The study demonstrated that the bioaccessibility of bioactive compounds in hardaliye can vary depending on the grape variety and to some extent, the use of mustard seed. This suggests that the food matrix and interaction with other food matrices in the environment can affect the stability and bioavailability of bioactive compounds during simulated digestion.

Ultrasound assisted choline chloride-based deep eutectic solvent extraction of bioactive compounds from salsify (Tragopogon buphthalmoides (DC.) boiss. Var. Latifolius Boiss.): A Box–Behnken design approach for optimization

This study aimed to investigate the ultrasound-assisted extraction of bioactive compounds from salsify using deep eutectic solvents (DESs) with different molar ratios. For this reason, total phenolic (TPC), total flavonoid (TFC) compounds, and antioxidant activities (1,1-diphenyl-2-picrilhydrazyl radical scavenging activity (DPPH•), and ferric reducing antioxidant power (FRAP)) of extracts prepared with DES were investigated with an experimental design and optimization study conducted for this purpose. An extraction time of 40.15 min was determined as the optimal condition. Under these conditions, a molar ratio of 3:1 (acetic acid:choline chloride) and a water ratio of 42.17 % provided the highest phenolic/flavonoid compounds and antioxidant activity. Correlations between water ratio, molar ratio, and sonication extraction time were determined using principal component analysis (PCA). In conditions where TPC, FRAP, and DPPH• were high according to PCA, it can be concluded that the extraction time, water ratio, and molar ratio are at high levels; contrarily, TFC is at a low level. In conclusion, ultrasound-assisted extraction using DES proved effective for salsify. Therefore, choline chloride-based DESs, can be recommended as environmentally friendly green solvents and an alternative to organic solvents for the extraction of bioactive compounds from salsify.

PERBANDINGAN TOTAL SENYAWA FLAVONOID EKSTRAK ETANOL KULIT DAN BIJI BUAH OKRA HIJAU (Abelmoschus esculentus L.)

Green okra (Abelmoschus esculentus L.) is a plant belonging to the Malvaceae family. Green okra fruit contains many secondary metabolites, one of which is flavonoids, which have potential as antioxidants to stabilize free radicals. This study aims to determine and compare the total flavonoid content of seeds and skin, so that it can be ascertained which part of the fruit has the highest total flavonoid content. The okra fruit extraction process was carried out by maceration with 70% ethanol solvent. Phytochemical screening and thin layer chromatography tests were performed on green okra seeds and skin extracts. The total flavonoid content was determined using the colorimetric-aluminum chloride method with UV-Vis spectrophotometry. The results of the phytochemical screening showed that the ethanol extract of green okra fruit peels contained alkaloids, flavonoids, tannins, and steroids, while the ethanol extract of green okra fruit seeds contained alkaloids, flavonoids, saponins, and tannins. The results of the thin layer chromatography test showed that the ethanol extract of green okra fruit skin and seeds contained a flavonoid compound as quercetin. The results of the total flavonoid content of the ethanol extract of green okra fruit skin : okra fruit seeds were 6.4589 mg QE/g extract ± 0.86 : 27.7583 mg QE/g extract ± 0.36. Based on statistical results with an Independent T test using SPSS, the significance value (2-tailed) of both samples was &lt; 0.05, which means that there is a real difference between the total flavonoid compounds of skin ethanol extract and ethanol extract of green okra fruit seeds.

Antibacterial activity of faloak (Sterculia quadrifida) leaves extract

Abstract. Purwantiningsih TI, Widyobroto BP, Suranindyah YY, Artama WT. 2023. Antibacterial activity of faloak (Sterculia quadrifida) leaves extract. Biodiversitas 24: 6613-6620. Restrictions on the use of antibiotics have made people start looking for alternatives to antibiotics, one of which is ingredients that come from nature. Faloak (Sterculia quadrifida R. Br) leaves are a source of secondary metabolites that have not been widely utilized. The aim of this study was to assess the antibacterial activity of faloak leaves extract in inhibiting Staphylococcus aureus (gram-positive bacteria) and Escherichia coli (gram-negative bacteria). Powdered faloak leaves were macerated with 96% ethanol solvent. After obtaining the crude extract, it was fractionated using the liquid-liquid method using methanol, hexane, distilled water and ethyl acetate as solvents. The crude extract of faloak leaves was then dissolved into several concentrations. The crude extract of faloak leaves and the fractions obtained were tested for antibacterial activity in vitro using the Kirby Bauer method against Staphylococcus aureus and Escherichia coli. The most active fraction in inhibiting the tested bacteria was then screened for bioactive compounds using instrument LC-HRMS. The results showed that faloak leaves extract and its fractions were able to inhibit Staphylococcus aureus and Escherichia coli bacteria. The ethyl acetate fraction was the most active fraction in inhibiting bacteria and the most occurring bioactive compounds appeared in LC-HRMS testing were luteolin, rutin and corchorifatty acid. The total flavonoid compound in the crude extract was 227.281 QE µg/mL and the highest i.e. 351.456 QE µg/mL total flavonoid compound was in methanol fraction.

Analysis of volatile compounds, betaine, and antioxidant effect in goji berry (Lycium barbarum L.) powder extracted by various drying methods and extraction solvents

Goji berry (Lycium barbarum L.), a deciduous solanaceous shrub, were subjected to extraction using five solvents (water, 50% and 70% ethanol, and 50% and 70% methanol) and dried using two methods: freeze drying (FD) and spray drying (SD). To investigate the chemical properties of these various goji berry powders, an examination was conducted on the content of volatile compounds, betaine, antioxidant effect, total phenolic content (TPC), and total flavonoid compounds (TFC) (p < 0.05). The total volatile compound content was highest in SD powder with 50% ethanol extract, showing a 66.7% increase over the control. The betaine content was in the range of 9.25–31.9 mg/g dry weight, and it exhibited a significant increase with higher water concentration in the extraction solvent. Betaine, total phenolic compounds and total flavonoid compounds showed a significant increase in the sequence of SD followed by FD (p < 0.05). Overall, the SD sample showed superior benefits when evaluating volatile compounds, betaine, and antioxidant effect. SD was more suitable for drying goji berry, as it retains its appearance and biological activity.

PENGARUH VARIASI WAKTU PANEN TERHADAP KADAR FLAVONOID TOTAL DAUN KUMIS KUCING (Orthosiphon aristatus (Blume) Miq.)

Harvest time influences the formation of optimal active compound content in the areal parts in plant. It is known that differences in harvest time can affect the quality and quantity of traditional plant. Flavonoids are known to be active metabolites in Orthosiphon aristatus with a wide range of bioactivity. This research aims to determine the best harvest time for Orthosiphon aristatus leaves in order to obtain optimal simplicia quality. Plants were harvested in in the morning (06.00-07.00 WIB), in the afternoon (12.00-13.00 WIB) and in the evening (17.00-18.00 WIB). The picked leaves are then sorted, washed and dried using a drying oven before each simplicia is extracted. Extraction uses a maceration technique with 96% ethanol solvent. The simplicia and extracts obtained were analyzed for organoleptic, yield, drying loss and qualitative and quantitative analysis of total flavonoid compounds. Qualitative identification of flavonoids used dilute NaOH, Wilstater Cyanidin, and AlCl3 reagents, while for quantification total flavonoid levels were measured using UV-Vis spectrophotometry as Quercetin Equivalent. The difference in harvest time did not affect the organoleptic properties of leaves. The drying loss of simplicia meets the requirements in the Indonesian Herbal Pharmacopoeia Edition II (less than 10% w/w). The highest yield of simplicia (23.8% w/w) and extract (11.3% w/w) was produced during the harvest time of 12.00-13.00 WIB, followed by harvesting at 17.00-18.00 and 06.00-07.00 WIB. All extracts contain flavonoids, while the total flavonoid content in each extract showed significant differences. The highest total flavonoid content (4.423+0.029 mgQE/g extract) was related at the harvest time of 17.00-18.00 WIB and the lowest value (4.331+ 0.026 mgQE/g extract) was recorded at the harvest time of 06.00-07.00 WIB. Our findings in Orthosiphon aristatus, may pave the route towards the optimization of quality and quantity by selecting the best harvesting time of the plants.

Analysis of Total Phenol and Flavonoid Compounds in Temulawak (Curcuma xanthorrhiza Roxb.) Tablets Based on Differences in Maltodextine Concentration

Temulawak (Curcuma xanthorrhiza Roxb.) has empirical phenolics and flavonoids which can act as antioxidants. The purpose of this study was to produce tablets of temulawak (Curcuma xanthorrhiza Roxb.) with variations in the addition of maltodextrin concentration and to find the best results. This research was conducted using a non-factorial Randomised Block Design (RBD) with 3 treatment levels, the ratio of maltodextrin to 1:2 (50%), 1:4 (25%) and 1:6 (16.70%). The results of this study showed that all tablets formed met the requirements of BPOM Number 32 of 2019 such that the tablets must be less than or equal to 10% and all the shaped tablets had a uniform weight. The tablets with 1:2 (50%) treatment had the highest value which was able to produce the highest total mean value of phenolics and flavonoids when compared with 1:4 (25%), 1:6 (16,70%) and control treatments. In a 1:2 (50%) treatment, the total phenolic value was 3.63 mg GAE/g ± 0.09, while the total flavonoid value was 6.11 mg QE/g ± 0.30. Therefore, it can be stated that the maltodextrin concentration treatment with a ratio of 1:2 (50%) was the optimum method for producing temulawak (Curcuma xanthorrhiza Roxb.) tablets in this study.

Comparative study of bioactive compound content and antioxidant activity in different extraction methods of Syzygium Polyanthum leaves

Link of Video Abstract: https://youtu.be/VtCPJX9TPg4 Background : Syzygium Polyanthum is classified among the 5,000 medicinal plant species documented in the Indonesian Medicinal Herb Index. It is utilised for a variety of purposes in traditional medicine and has potential health benefits. Extraction of medicinal plants is crucial to separate active plant materials or secondary metabolites. The aim of the study was to compare extracts of Syzygium Polyanthum Leaves using different methods: maceration and UAE in extracting flavonoids, phenolic compounds and antioxidant activity. Methods: the bioactive component content and antioxidant activity of Syzygium polyanthum leaves extracted using two different methods—maceration and ultrasound-assisted extraction (UAE)—are compared. 96% ethanol was employed as the extracting solvent in the maceration and UAE extraction processes for S. polyanthum.The bioactive substances in both extracts were determined using Liquid Chromatography-High Resolution Mass Spectrometry (LC-HRMS). Result: The amount of total phenolic, flavonoid, and IC50 in S. polyanthum leaves was evaluated between the maceration extraction method and UAE. Liquid chromatography-high Resolution Mass Spectrometry (LC-HRMS) analysis was utilized to detect the presence of bioactive compounds, then classified according to the PubChem database's taxonomy. There were comparable amounts of flavonoids in both extracts (60.194 mg QE/g and 60.074 mg QE/g). According to the DPPH assay, the total phenol for the extracts obtained by maceration and UAE was 94.63 ± 2.18 mg GAE/g and 122.87 ± 5.99 mg GAE/g extracts respectively, and the IC50 for the extracts obtained by maceration and UAE were 88.21 ± 1.38 μg/mL and 41.23 ± 6.11 μg/mL. Conclusion: The findings of the study indicated that the ultrasonic-assisted extraction (UAE) approach yielded significantly greater quantities of total phenolic and flavonoid compounds, as well as exhibited stronger antioxidant activity, when compared to the maceration extraction method. The utilisation of the UAE approach resulted in a significant rise in the antioxidant activity of S. polyanthum leaves.

Chromatographic Profiles and Determination of Total Flavonoid Content of the Ethyl Acetate Fraction of Kalangkala Leaves (Litsea Angulata Blum) Using Uv-Vis Spectrophotometry

Background: Kalangkala is a fruit plant typical of Kalimantan and belongs to the species of the genus Litsea which is thought to have potential as a natural antioxidant. Empirically, some people in South Kalimantan use the kalangkala plant, especially the seeds of the fruit, to treat boils. One of the compounds that have antioxidant and antibacterial content is flavonoids.Objectives: To determine the thin layer chromatography profile of the total flavonoid compound of the ethyl acetate fraction and to calculate the total flavonoid content of the ethyl acetate fraction of the leaf extract of Kalangkala (Litsea angulata Blum).Method: Thin Layer Chromatography Profile and Determination of Total Flavonoid Content of the Ethyl Acetate Fraction of Kalangkala Leaf Extract using the UV-Vis Spectrophotometry method. The data were then analyzed qualitatively and quantitatively.Results: The chromatographic profile of the total flavonoids of the ethyl acetate fraction of Kalangkala leaf eluent that was most optimal was Ethyl acetate : n-Hexane (3:7) because it showed the most stains, namely 5 stains. And in the uv-vis spectrophotometry method, the total flavonoid content of the ethyl acetate fraction of Kalangkala leaves (Litsea angulata Blum) was 0.9 mg QE/g.Conclusion: Kalangkala leaf extract on the TLC profile using ethyl acetate : n-Hexane (3:7) showed a total of 5 stains. And the value of the total flavonoid content of the ethyl acetate fraction of kalangkala leaves was 0.9 mg QE/g.

Ultrasound-assisted deep eutectic solvent extraction of bioactive compounds from persimmon calyx.

This study aimed to investigate the ultrasound-assisted extraction of bioactive compounds from persimmon (Diospyros kaki) calyx by deep eutectic solvents (DES) with different molar ratios. For this reason, the prepared DES extracts' total phenolic-flavonoid compounds and antioxidant activities (1,1-diphenyl-2-picrilhydrazyl radical scavenging activity [DPPH•], Cupric Reducing Antioxidant Capacity (CUPRAC), and ferric reducing antioxidant power [FRAP]) were investigated as a result of the experimental design and optimization study conducted for this purpose. A sonication time of 20min was determined as the optimal condition. Under these conditions, a molar ratio of 1.9:1 (lactic acid:choline chloride) and a water ratio of 70% provided the highest phenolic/flavonoid compounds and antioxidative activity. Correlations among water ratio, molar ratio, and sonication time were determined using principal component analysis (PCA). In conditions where total flavonoid compound, FRAP, and DPPH• are high due to PCA, it can be concluded that the sonication time is at high level; on the contrary, the water and molar ratios are at low level. In conclusion, ultrasound-assisted extraction using DES proved effective in persimmon calyx. Therefore, it can be recommended to use these environmentally friendly green solvents as an alternative to organic solvents in preparing extracts in various fields. PRACTICAL APPLICATION: This study shows the effectiveness of the ultrasound-assisted green extraction method using persimmon calyx specified as waste. These findings are compelling in the food industry in terms of consumers being now aware of green technology and the discovery that calyx is a good source of bioactive compounds.

Effects of black seed oil combined with olive oil or honey on antioxidant activities, phenolic content, and identification and quantification of thymoquinone, a key bioactive compound

The plant Nigella sativa (NS) has a rich history in folk medicine, being utilized for various illnesses and as tonic drugs. Furthermore, thymoquinone (TQ), a major compound found in the seeds of NS, may exhibit antioxidant activity. In addition to black candles, traditional medicine employs olive oil and honey to nourish the body. Some folk medicine systems combine NS, honey, and olive oil for improved efficacy; however, knowledge regarding the antioxidant properties of black seed oil (BSO), BSO with olive oil (BSOO), and BSO with honey (BSOH) remains limited. Therefore, in this study, we investigated the antioxidant properties of BSO, BSOO, and BSOH. Gas chromatography-mass spectrometry analysis showed that BSO contained 73.48 ± 1.23 mg/kg TQ. BSO, BSOO, and BSOH exhibited remarkable antioxidant activity, with NO scavenging activities of 94.32, 76.53, and 50.37, respectively. The 2,2-diphenyl-1-picrylhydrazyl and metal chelating activity assays (with half-maximal inhibitory concentration values), oxygen radical antioxidant capacity, and total flavonoid compound content of BSO were 0.135 ± 0.003 mg/mL, 0.005 ± 0.003 mg/mL, 32 ± 0.4 μM Trolox/g extract, and 997 ± 20 mg catechin equivalent/g of extract, respectively. These results are potentially linked to the increased antioxidant activity, as suggested by Pearson's correlation coefficients. In the ferric-reducing antioxidant power assay, the highest antioxidant activity was demonstrated by BSOO and BSOH, with total phenolic content of 7288 ± 300 mM FeSO4/mg and 346 ± 17 mg of gallic acid equivalent/g E, respectively. This study affirms the potent antioxidant properties of BSO, BSOO, and BSOH, emphasizing the importance of further research on NS infusion as a promising antioxidant agent and its application as an anti-aging and tonic drug.

Influence of agitation and solvent percentage on the extraction of phytochemical compound from Asystasia gangetica

This study aims to investigate the influence of agitation and solvent percentage on the phytochemical extraction from Asystasia gangetica through response surface methodology and to optimize the extraction condition. The experiment was conducted based on the central composite design with two variables: solvent percentage and agitation speed. The total phenolic compound (Folin–Ciocalteu method), total flavonoid compound (Dowd method), and antioxidant activity (modified DPPH free radical scavenging assay), were analyzed through the analysis of variance. All models were significant (p-value <0.05) with strong R2 values (over 80 %), indicating satisfactory regression analysis. The optimum condition is achieved at 204 rpm agitation speed and 72 % solvent percentage with total phenolic, total flavonoid, and antioxidant activity at its maximum value of 0.2086 mg/ml, 0.2082 mg/ml, and 1.0494 nmol/ul, respectively. The influence of factors on each phytochemical varies, with both being significant for total flavonoid compound extraction and insignificant for antioxidant activity. Meanwhile, for the total phenolic compound, the solvent percentage is insignificant. Determining the significant factors during phytochemical extraction could be useful in tailoring the suitable range to maximize yield. The bioactive compounds and nutritional composition of A. gangetica could be used to develop functional foods and development of drugs to manage various disease.

Ultrasound-Assisted Extraction of Antioxidant Compounds from "Cẩm" Purple Rice Bran for Modulation of Starch Digestion.

Purple rice, locally known as "Cẩm" rice, is cultivated in the southern region of Vietnam. The bran of "Cẩm" rice is often disregarded and underutilized; nevertheless, it harbours substantial nutritive value, particularly in terms of antioxidant compounds. Additionally, sonication, an emerging and "green" technological approach, has been employed to augment the extraction efficiency of these antioxidants. This research is aimed at optimizing and maximizing the antioxidant recovery capacity including phenolic and total flavonoid compounds, along with their antioxidant activities, through the assistance of ultrasound waves. The effect of the extract on the starch digestion process was also investigated. The study employed the Box-Behnken experimental design, encompassing three variables: extraction time (20-40 minutes), temperature (60-80°C), and solvent-to-material ratio (8 : 1 to 12 : 1). Analysis was conducted on total phenolic compounds, total flavonoid content, and antioxidant activities. Results demonstrated that the peak yield of antioxidant compounds and their corresponding activities were attained at an extraction duration of 29.38 minutes, a temperature of 69°C, and a solvent-to-material ratio of 9.92. Under these optimal conditions, the yields were as follows: total phenolic compounds at 60.821 mg GAE/g, total flavonoid compounds at 3.2696 mg QE/g, percentage inhibition of DPPH at 74.778%, and FRAP value at 54.112 μmol Fe (II)/g. The established models were validated and exhibited a strong alignment between predicted and actual values, with disparities of less than 3% under optimal conditions. Furthermore, the extract was codigested with cooked corn starch, revealing a dose-dependent effect on starch digestibility. The sluggishness of digestion rate was observed when 20 mg of the extract was supplemented to 200 mg of cooked corn starch. This suggests that rice bran extract holds promise as an effective ingredient for mitigating starch digestion, particularly beneficial for individuals dealing with diabetes.