Gram Of Extract Research Articles

The effect of Polygonum hyrcanicum Rech. f. hydroalcoholic extract on oxidative stress and nephropathy in alloxan-induced diabetic mice

Diabetic nephropathy, characterized by inflammation and oxidative stress, poses a management challenge. This study investigates the effect of Polygonum hyrcanicum extract on diabetic nephropathy in alloxan-induced diabetic mice. In this experimental animal study, the P. hyrcanicum extract was prepared using continuous macerations. Thirty male Albino mice, divided into five groups, were induced with alloxan-induced diabetes. They received intraperitoneal injections of the plant extract (100 and 200 mg/kg) and metformin (300 mg/kg) for four weeks. Kidney and blood samples were collected to assess protein carbonyl, glutathione, lipid peroxidation, TNF-α and IL-6 levels. The amount of total flavonoid and phenolic content in the hydroalcoholic extract of P. hyrcanicum were 7.5 ± 0.3 mg of quercetin and 88.2 ± 1.3 mg gallic acid per gram of extract respectively. The antioxidant activity level of the hydroalcoholic extract was determined to be 1.78 ± 0.51 mM equivalent per gram of extract. Alloxan administration resulted in a significant reduction in glutathione levels and a significant increase in protein carbonyl, lipid peroxidation, TNF-α, and IL-6 levels. Hydroalcoholic extract of P. hyrcanicum effectively reduced oxidative stress markers and inflammatory cytokines (TNF-α, IL-6), indicating its potential in mitigating diabetic nephropathy. However, no significant difference in efficacy was observed between the 100 mg/kg and 200 mg/kg doses in terms of reducing these toxicities.

Influence of hydrothermal processing conditions on the functionality of Phaeodactylum tricornutum extracts

Microalgae are an underutilized biomass source of nutritionally valuable extracts with promising texturizing capacities that can be used for food applications. This also requires the development of environmentally friendly extraction technologies. Hydrothermal processing was used in this study to investigate the effects of temperature (up to 225 °C) on the extracts from the diatom Phaeodactylum tricornutum. The relationship between protein and polysaccharides' presence and functionality was assessed, based on structure, composition, bioactivity, and rheological behavior. An optimal condition of non-isothermal processing at 120 °C resulted in the extract with gelling capacity (at 20 % w/w extract concentration). This extract is rich in carbohydrates in oligosaccharide form (9 g per 100 g extract) and protein (16 g per 100 g extract), which indicates nutritional relevance and possible prebiotic effects. Moreover, after an additional purification step with food-grade solvents, this extract was able to gel at 5 % w/w concentration. These combined with its significant antioxidant activity (over 100 μmol Trolox equivalents per gram of extract in all studied conditions, using the ABTS method) point towards new possibilities for the application of Phaeodactylum tricornutum extracts in novel clean-label vegan foods. Overall, these findings suggest that the novel approach proposed in this work, based on hydrothermal processing, is feasible and compatible with the need for the application of simple purification steps with food-grade solvents. Furthermore, it reinforced the relevance of the carbohydrate fractions and carbohydrate-protein interactions from microalgae.

Quantification of phenolic compounds in dietary supplements and antioxidant activities

Dietary supplements (DS) are products that are recommended for the treatment of various health issues, especially during the global pandemic, and the accuracy of the labeling information of these supplements plays a significant role in human health. In this study, a novel high performance liquid chromatography-diode array detector (HPLC-DAD) method was developed and validated to determine the accuracy of the labeling information of commercial dietary supplements containing phenolic compounds (rutin, quercetin, and resveratrol). The mobile phase, flow rate, and column temperature were optimized. Validation studies were carried out to prove the validity of the developed method. The limit of detection (LOD) and limit of quantification (LOQ) values ​​of rutin, quercetin, and resveratrol were found in the range of 4.83-6.62 ng/mL and 16.09-22.07 ng/mL, respectively. Recoveries% were calculated in the range of 99.52-100.19% and 99.78-100.34% in the intra-day and inter-day analysis, respectively. The IC50 values of the dietary supplement extracts obtained by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method ranged from 0.08 to 0.76 mg/mL. Total Antioxidant Capacity (TAC) values of DS1, DS2, DS3, DS4, DS5, measured employing the Cupric Reducing Antioxidant Capacity (CUPRAC) method, were found to be 0.09, 0.03, 0.10, 0.10 and 0.40 mmol trolox per gram of extract, respectively. KEY WORDS: Dietary supplement, HPLC-DAD, Phenolic compound, Antioxidant activity Bull. Chem. Soc. Ethiop. 2024, 38(4), 853-862. DOI: https://dx.doi.org/10.4314/bcse.v38i4.3

In vitro Immunostimulant Activity of the Polyphenolic Extract from the Arctic Brown Algae Fucus vesiculosus.

Polyphenols (PP) found in brown algae are known for their wide range of biological activities including noteworthy antitumor properties. This article presents a method for obtaining an active polyphenolic extract from the Arctic alga Fucus vesiculosus with 98% purity and radical scavenging activity equivalent to 862mg of ascorbic acid per gram of extract. Immunostimulant effects of polyphenols were assessed in vitro using venous blood from two groups of people: healthy people (HP) and people with chronic undifferentiated lymphocytic leukemia (LP). Polyphenols activated the surface properties of immunocompetent cells. Specifically, polyphenols dose-dependently increased the percentage of cells' spreading and adhesion by 2-3 times. Additionally, polyphenols increased the number of activated lymphocytes in the LP blood to levels characteristic of HP. Given their natural origin, high activity, non-toxicity, and straightforward production process, these studied polyphenols exhibit immense potential for use as new pharmaceuticals or as active components with immunostimulatory effects.

Antioxidant potential and determination of total phenolic and flavonoid content of Bugis ginseng (Talinum paniculatum Gaertn) leaf water extract

Bugis ginseng (Talinum paniculatum Gaertn.) leaves function as a traditional medicine to increase breast milk production, to increase appetite, to improve the immune system and as an antibacterial as we as medicine for ulcers. Flavonoids are phenolic compounds, one of the secondary metabolites in plants that function as antioxidants. This study aims to determine the total phenol content, total flavonoids and antioxidant activity of water extract of Bugis ginseng leaves. Quantitative determination of total phenols using the Folin-Ciocalteu method was expressed as gallic acid equivalent (GAE) per gram of extract. Total flavonoid content using the AlCl3 method was expressed as Quercetin equivalent (QE) and in vitro antioxidant activity with DPPH (2, 2-diphenyl-1-picrylhydrazyl) expressed in terms of IC50 (inhibition concentration). The results showed that water extraction of ginseng leaves showed a total phenol content of 8.37 mg GAE/g extract, a total flavonoid content of 2.12 mg QE/g extract and an IC50 value of 60.27 ug/ml.

Phytochemicals, Health-Promoting Effects, and Enzyme Inhibition Traits of Phlomis stewartii Extracts.

Phlomis stewartii is a wild, perennial woody plant used for diverse therapeutic targets. The present work evaluated the influence of independent variables such as extraction time, solvent concentration, and speed in the range of (100 mL, 150 mL, and 200 mL), (2 h, 5 h, and 8 h), and (100 rpm, 150 rpm, and 200 rpm), respectively, on extraction yields, phytochemical components, total phenolic contents (TPC), and total flavonoid contents (TFC) of P. stewartii extract. In the present work, response surface methodology (RSM) was applied to optimize the extraction yield. High-performance liquid chromatography (HPLC) was performed to detect the bioactive constituents of the extracts. The potent extracts were analyzed to study α-amylase and α-glucosidase inhibitory activities. Under the optimized conditions of solvent concentration (200 mL), extraction time (8 h), and speed (150 rpm), the whole plant methanol extract (WPME) showed a maximum extraction yield of 13.5%, while the leaves methanol extract (LME) showed a maximum TPC of 19.5 ± 44 mg of gallic acid equivalent (GAE) per gram of extract and a maximum TFC of 4.78 ± 0.34 mg of quercetin equivalent (QE) per gram of extract. HPLC analysis showed the presence of p-coumaric, gallic acid, quercetin, salicylic acid, sinapic acid, and vanillic acid. LME showed the highest α-amylase inhibitory activity (IC50 = 46.86 ± 0.21 µg/mL) and α-glucosidase inhibitory activity (IC50 value of 45.81 ± 0.17 µg/mL). Therefore, in conclusion, LME could be considered to fix the α-amylase and α-glucosidase-mediated disorders in the human body to develop herbal phytomedicine.

Photoprotection-related properties of a raw extract from Gordonia hongkongensis EUFUS-Z928: A culturable rare actinomycete associated with the Caribbean octocoral Eunicea fusca.

UV filters in current sunscreen formulations can have negative effects on human health, such as endocrine disruption and allergic reactions, as well as on the environment, including bioaccumulation and coral health toxicity. As a result, there is a need to find alternative compounds that serve as safer and more ecofriendly active ingredients. This study successfully isolated actinomycetes from the octocoral Eunicea fusca and assessed their potential as producers of photoprotective compounds. The use of bio-based chemical agents, particularly natural products, has been a highly effective strategy for discovering bioactive compounds, especially in marine invertebrates and their associated microbiota. Eighteen bacterial isolates were obtained and subsequently employed to prepare raw methanolic extracts from seven-day submerged cultures in Zobell marine broth. The resulting extracts were screened for 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging capacity and characterized by total phenolic and flavonoid content measurements. After screening, the Gordonia hongkongensis EUFUS-Z928-derived raw extract exhibited the best antioxidant profile, i.e. DPPH and ABTS radical scavenging of 4.93 and 6.00 µmol Trolox per gram of extract, respectively, and selected for further photoprotection-related analysis. Thus, this extract demonstrated a UV-absorbing capacity of 46.33% of the in vitro sun protection factor calculated for 30 µg/mL oxybenzone but did not exhibit any cytotoxicity on human dermal fibroblasts (HDFa cell line) at concentrations up to 500 µg/mL. The liquid chromatography-mass spectrometry chemical characterization of this extract showed compounds with structural features associated with free radical scavenging and UV absorption (i.e. photoprotection-related activities). These findings highlighted the potential of the microbiota associated with E. fusca and confirmed the feasibility of exploiting its metabolites for photoprotection-related purposes.

Cardioprotective effects of Callicarpa tomentosa leaf extract in Wistar albino rats against isoproterenol-induced myocardial necrosis: Phytochemical analysis and in vitro antioxidant study

BackgroundGlobally, cardiovascular disease (CVD) remains the foremost cause of mortality. Conventional medications are associated with several complications, necessitating an alternative, safe and efficacious medicine. Therefore, the study was planned to assess the cardioprotective efficacy of Callicarpa tomentosa (CT) leaf extract against isoproterenol (ISO)-induced myocardial failure in experimental rats. Materials and methodsCT leaf extract was subjected to phytochemical analysis, total phenolic and flavonoid content measurement, and in vitro antioxidant evaluation. Additionally, the protection from myocardial injury was evaluated based on the estimation of biomarkers including CK-MB, CKNAC, and LDH in both the low-dose (200 mg/kg) and high-dose (400 mg/kg) groups of rats. We measured endogenous antioxidants in heart tissue to estimate the antioxidant potential. Histopathological analysis confirmed the biochemical results. ResultsThe findings of this study indicated that the CT leaf extract contained several phytoconstituents such as alkaloids, flavonoids, steroids and triterpenoids, cardiac glycosides, carbohydrates, phenols, saponins, and tannins. The CT's total phenol content was 33.3 ± 0.14 mg GAE (Gallic Acid Equivalent) per gram of extract, while its total flavonoid concentration was 76.5 ± 1.2 mg QUE (Quercetin Equivalent). In the DPPH assay, CT had a mean inhibitory effect of 60.06 ± 1.358 g/ml, whereas its IC50 in the H2O2 radical scavenging activity assay was 102.85 ± 0.194 g/ml. The electrocardiograms of the treated animals demonstrated considerable recovery from ISO-induced electrophysiological abnormalities as well and the amount of endogenous biomarkers was significantly reduced in animals that receivedCT treatment. Additionally, the use of CT reversed the effects of ISO administration on SOD activity, increased GSH levels, and lowered LPO levels. The damage to the heart tissues was significantly reduced, with the tissue architecture appearing closer to normal in groups that received high doses of CT. ConclusionThese results suggest that C. tomentosa leaf extract has potent antioxidant activity and provides protection against isoproterenol-induced cardiac necrosis in Wistar albino rats. The cardioprotectivebenefits are attributed to the presence of active components in the extract, which aid in the restoration of antioxidant equilibrium and the reduction of damage caused by oxidative stress.

Response surface methodology and artificial neural network modeling as predictive tools for phenolic compounds recovery from olive pomace

This study optimized the extraction of three major phenolic compounds (oleuropein, tyrosol, and verbascoside) from olive pomace using microwave- and ultrasonic-assisted methods. Screening factorial design (SFD) and central composite design (CCD) were employed, and response surface methodology (RSM) and artificial neural networks (ANN) were used for data modeling. The microwave-assisted method in the SFD yielded higher compound amounts, with verbascoside showing a four-fold increase compared to the ultrasonic-assisted method. Factors like vessel diameter, ultrasonic power using UAE, and solvent acidity in both techniques had minimally impacted extractability. CCD-RSM revealed temperaturés significantly affect on oleuropein, but improved tyrosol recovery, with the effect on verbascoside being influenced by the temperature range. RSM and ANN integration enhanced understanding and prediction of factor behavior. Microwave-assisted extraction at 113 °C for 26 min, with minimum ramp time of 7.7 min, yielded 67.4, 57, and 5.1 mg of oleuropein, tyrosol, and verbascoside per gram of extract, respectively, with a prediction error ranging from 0.83 to 15.19.

Formulation of anti-malaria capsules based on the fruit of Picralima nitida (Stapf) T. Durand and H. Durand (Apocynaceae

Malaria is a parasitic disease that is widely spread throughout the world. The annual number of cases is estimated at around 500 million; the African continent is the most affected, accounting for 95% of cases. For the treatment, WHO recommends artemisinin-based combinations; unfortunately, the cost of these combinations is relatively high, making them difficult to afford. This justifies the search for new antimalarial drugs. A large number of plant species in Cameroon have been identified as anti-malarial medicinal plants. Picralima nitida is one of the plants traditionally used to treat malaria in traditional medicine, and its in vitro and in vivo antimalarial activity and toxicological profile have already been scientifically demonstrated. The aim of the present study was to formulate capsules based on the aqueous extract of Picralima nitida fruit, in an attempt to rationalize its use in the treatment of malaria. The aqueous extract of Picralima nitida fruit was prepared by maceration and then stabilized; its physicochemical characteristics were determined. The daily quantity of extract required for the treatment of malaria was determined in milligrams of total alkaloids. Finally, the extract was stabilized before being filled into capsules using European pharmacopoeia techniques. The capsules were also tested according to European Pharmacopoeia 11th edition techniques. The extract was obtained in 6.25% yield. The extract was soft, hygroscopic, brown in color, very bitter in flavor and caramel in odor. The following phytochemical groups were present in the extract: alkaloids, phenolic compounds, flavonoid tannins, anthocyanins, saponins, terpenes, sterols. Total alkaloid content was 0.11g per gram of extract. To stabilize the extract and make it suitable for capsule filling, 25% colloidal silica and 13% microcrystalline cellulose were added. The stabilized extract showed good flowability (flow time 6s, Carr index 11.8% and Hausner index 1.13), a moderately fine powder texture (d50 < 300um) and homogeneous distribution. The daily dose determined for a 60 kg adult was 3900mg of extract, corresponding to 313 mg of total alkaloids, which could be divided into 8 N°0 or 12 N°00 capsules. On inspection, the capsules were found to comply with the requirements of the 11th edition of the European Pharmacopoeia. The characteristics of the formulated capsules are favorable to make them a good candidate for the various phases of clinical trials with a view to making them an improved traditional medicine (ITM)

Dynamic Maceration of Acerola (Malpighia emarginata DC.) Fruit Waste: An Optimization Study to Recover Anthocyanins

Acerola (Malpighia emarginata DC.) is a tropical fruit with a vibrant red color attributed to anthocyanins, natural pigments, with several applications in the food, nutraceutical, and cosmetic industries. Therefore, the suitability of acerola fruit waste for producing anthocyanin colorants by dynamic maceration was investigated. The extraction process was optimized by combining the factors time (2–90 min), temperature (20–90 °C), and ethanol percentage (0–100%) in a central composite rotatable design (CCRD) coupled with response surface methodology (RSM). The extraction yield determined by a gravimetric method and the levels of cyanidin-O-deoxyhexoside and pelargonidin-O-deoxyhexoside anthocyanins quantified in the 20 run extracts by HPLC-DAD were used as dependent variables. After fitting the experimental data to a quadratic equation, the obtained statistically valid predictive models were used to determine optimal macerating conditions. Under global settings (25 min processing at 41 °C with 12% ethanol), the extraction yielded 57.1% (w/w) and each gram of extract contained 2.54 mg of anthocyanins. Overall, this study highlights the renewable potential of acerola fruit waste for obtaining natural anthocyanin extracts that could represent a sustainable alternative to artificial colorants used in food and other products.

Phytochemical Analysis, Antioxidant, and Antihyperglycemic Activities of Crataegus monogyna Jacq Aqueous Extract

Objective This study aims to evaluate the phytochemical composition, antioxidant, and antihyperglycemic (in vivo, in vitro, and in silico) activities and acute toxicity of Crataegus monogyna Jacq ( C monogyna) aqueous extracts. Methods The study analyzed the aqueous extract of C monogyna through various methods such as phytochemical screening, and the high-performance liquid chromatography-ultraviolet (HPLC-UV)-visible analysis. The extract was also tested for antioxidant potential, acute toxicity, antihyperglycemic effect, and inhibitory effect on the pancreatic α-amylase enzyme. Additionally, the study used the molecular docking approach to identify the most potent ligands in the extract. Results The phytochemical screening of the aqueous extract of C monogyna showed the presence of flavonoids, tannins, coumarins, sterol, and triterpene. The extract was rich in total polyphenols (1.65 ± 0.04 mg gallic acid equivalent per gram of extract [GAE/g] DM), total flavonoids (0.33 ± 0.03 EQ/g DM), and condensed tannins (0.28 ± 0.01 EC/mg DM). HPLC-UV-visible analysis identified 9 phenolic compounds, with high levels of gallic acid and caffeic acid. The C monogyna extract has a high antioxidant activity with an IC50 of 9.23 ± 0.01 mg/mL by DPPH and 8.32 ± 0.02 mg/mL by FRAP. The aqueous extract of C monogyna was not toxic to albino mice. The glucose tolerance test showed a significant antihyperglycemic effect, with an IC50 of 0.070 ± 0.008 mg/mL for the inhibition of pancreatic α-amylase activity by the aqueous extract of C monogyna. The in vivo inhibitory effect of the extract on the pancreatic α-amylase enzyme was confirmed. Two flavonoids, catechin, and rutin, were identified as potent inhibitors of the activity of α-amylase in the in silico part of the study, compared to the native ligand, Acarbose. Conclusion The study found that C monogyna has significant antioxidant and antihyperglycemic properties. The presence of catechin and rutin may contribute to these effects. The results suggest that C monogyna could be used as a dietary supplement to prevent and treat diabetes.

Antioxidant Properties of Extracts From Cultured and Wild Macromycetes

The antioxidant properties of benzene, methanol, and ethanol extracts from Agaricus bisporus, Lentinula edodes, Pleurotus ostreatus (cultivated species); Fomes fomentarius, Inonotus obliquus и Trametes versicolor (wild species) were studied. The total content of flavonoids and antioxidant activity were evaluated (DPPH, PFRAP, CUPRAC and β-carotene bleaching assay). The yield of benzene extracts was up to 1.9%; methanol up to 7.2%; ethanol to 9.6%. The content of total flavonoids in methanol and ethanol extracts from wild macromycetes was up to 29.5 mEq of rutin per gram of extract. Extracts from macromycetes showed low antioxidant activity in the PFRAP and CUPRAC reactions. It was found that methanol extracts from F. fomentarius and T. versicolor, as well as ethanol extracts from L. edodes, F. fomentarius and T. versicolor, have high antiradical activity against DPPH and β-carotene radical.

Antioxidant Activity Test of Caulerpa racemosa Extract from Takalar District Using the FRAP (Ferric Reducing Antioxidant Power) Method

Sea grapes or Caulerpa racemosa contain alkaloids, flavonoids, tannins, phenols and steroids. These compositions work as antioxidants. Antioxidants are compounds that can contribute one or more electrons to free radicals, so that the free radicals can be suppressed. The goal of this study was to determine the antioxidant activity of sea grape (Caulerpa racemosa) extract using the FRAP method. Extraction of sea grapes (Caulerpa racemosa) applied maceration and methanol methods. Absorbance of antioxidant activity was measured using a UV-VIS spectrophotometer at a wavelength of 700 nm. The results showed that sea grape extract (Caulerpa racemosa) had an antioxidant activity of 152 mg AAE/g extract. It means that in each gram of extract, it is equivalent to 152 mg of ascorbic acid.

The Cytotoxic Effect of the Tarragon (Artemisia dracunculus L.) Hydroalcoholic Extract on the HT-29, MKN45, and MCF-7 Cell Lines

Background::Cancer is one of the problems facing societies today and despite new advances in chemotherapy and cancer treatment, there are still many cancers that do not respond to today’s treatments. Tarragon with the scientific name of Artemisia dracunculus L. has various flavonoid and polyphenolic compounds and many therapeutic effects. Objectives: This study aimed to investigate the cytotoxicity of this plant on different categories of cancer cels. Methodes: After collecting the shoots of tarragon and extracting them by the maceration method, the weight of the extract with a yield of 22.25% was 12.9 g. After examining the presence of flavonoids and total phenol, the extract’s antioxidant activity was examined using DPPH and FRAP methods. Finally, MTT tests on three cancer cell lines, MCF-7, HT-29, and MKN45, were done using different concentrations of tarragon extract (100, 200, 500, and 1000 μg/mL). Results: Total flavonoids were detected at 24±1.18 mg of quercetin per gram of extract, and total phenols were detected at 59±2.21 mg of gallic acid per gram of extract. Examining the inhibitory effect of DPPH compared to vitamin C, it was found that the hydroalcoholic extract of tarragon has a 50% inhibitory effect. According to the standard curve, the amount of iron reduced by tarragon hydroalcoholic extract is equal to 405±0.11 μg/ml. The cytotoxic effect of tarragon hydroalcoholic extract on MCF7, MKN45, and HT-29 cell lines was investigated, and their IC50 values were 1065.669, 881.19, and 743.870 μg/mL, respectively. The A. dracunculus L extract inhibits the growth of cancer cells in various cell lines.

Effect of solvent, pH, extraction time and temperature on the extraction of phenolic compounds and antioxidant activity of Carpobrotus edulis

Two 23 factorial design studies were performed to determine the effect of solvent, pH, extraction time and temperature on the extraction of phenolics and radical scavenging activity contained in crude leaf extracts of Carpobrotus edulis. For the aqueous model, pH 9, 72 h and 40 °C provided the highest yield (31.03 ± 0.58%), while the highest yield for the methanolic extracts was obtained using the same temperature and pH, but with a longer extraction time of 168 h (64.21 ± 2.12%). Quantitative phytochemical analysis was performed to determine the amount of phenolics, tannins and flavonoids contained in the crude extracts. When water was used as an extraction solvent, the highest concentration of phenolics was obtained using pH 9 and extracting for 72 h at 40 °C (6.42 ± 0.03 milligrams Gallic Acid Equivalent per gram of extract). However, when methanol was used as a solvent, the highest concentration of phenolics was obtained when the same pH and time of extraction was used, but at a lower temperature (25 °C) – 7.44 ± 0.50 mg GAE/g of extract. Antioxidant activity was determined using the ABTS and DPPH assays. For both, methanol extracts produced lower IC50 values than the aqueous extracts. The best combination of extraction conditions for aqueous extracts is pH 9, and 72 h of extraction at 40 °C. This produced the lowest IC50 values for both assays (298.28 μg/mL for DPPH and 140.77 μg/mL for ABTS assay). When methanol is used as a solvent, the extraction conditions producing the lowest IC50 values were pH 9, 72 h and 25 °C for the DPPH assay (109.84 μg/mL), and pH 5, 168 h and 25 °C for the ABTS assay (26.79 μg/mL). These values are all higher than for the positive control, ascorbic acid. A positive correlation exists between phenolic content and radical scavenging activity – higher phenolic content resulted in higher radical scavenging activity. Pearson’s correlation coefficient was higher for the aqueous extracts than for the methanol extracts. Thus, extraction conditions must be modified to maximise extraction of phenolics, to obtain maximum radical scavenging activity.

Microwave-Assisted Extraction of Polyphenols from Eucalyptus Bark—A First Step for a Green Production of Tannin-Based Coagulants

Tannins are natural polyphenolic compounds widely found in plants. The production of natural coagulants for water treatment is one of their new applications. Polyphenols extraction is the first step for synthesizing tannin-based coagulants. Eucalyptus globulus bark (EGB), an abundant by-product of the pulp and paper industry, usually applied as fuel for energy production, was used in this work as a tannin source. The extraction of polyphenols from EGB was studied using water as a solvent. Extraction assays employing different extraction techniques were conducted. Microwave-assisted extraction showed superior performance and was further optimized. The influence of irradiation time, water-to-bark ratio, and temperature were evaluated using Response Surface Methodology. The extraction yield and the total phenolic content of the extract were modeled as function of the extraction conditions. The overall best conditions that maximize both responses were obtained through multi-response optimization. Optimized values (15% of extraction yield and a phenolic content of 354 mg of gallic acid equivalents per gram of extract) were predicted for an extraction time of 15 s, a liquid-to-solid ratio of 48.5 mL/g, and 141 °C. The extract generated under these conditions presented a condensed tannin content of 645 mg/g, expressed in terms of catechin equivalents. EGB presented good tannin-extractable contents to produce natural coagulants.

Chemical Composition of Ducrosia flabellifolia L. Methanolic Extract and Volatile Oil: ADME Properties, In Vitro and In Silico Screening of Antimicrobial, Antioxidant and Anticancer Activities.

In the present study, the chemical composition of the volatile oil and methanolic extract from Ducrosia flabellifolia Boiss. was investigated. The antimicrobial, antioxidant, and anticancer activities of the methanolic extract from D. flabellifolia aerial parts were screened using experimental and computational approaches. Results have reported the identification of decanal (28.31%) and dodecanal (16.93%) as major compounds in the essential oil obtained through hydrodistillation. Farnesyl pyrophosphate, Methyl 7-desoxypurpurogallin-7-carboxylate trimethyl ether, Dihydro-Obliquin, Gummiferol, 2-Phenylaminoadenosine, and 2,4,6,8,10-dodecapentaenal, on the other hand, were the dominant compounds in the methanolic extract. Moreover, the tested extract was active against a large collection of bacteria and yeast strains with diameter of growth inhibition ranging from 6.67 ± 0.57 mm to 17.00 ± 1.73 mm, with bacteriostatic and fungicidal activities against almost all tested microorganisms. In addition, D. flabellifolia methanolic extract was dominated by phenolic compounds (33.85 ± 1.63 mg of gallic acid equivalent per gram of extract) and was able to trap DPPH• and ABTS•+ radicals with IC50 about 0.05 ± 0 mg/mL and 0.105 ± 0 mg/mL, respectively. The highest percentages of anticancer activity were recorded at 500 µg/mL for all cancer cell lines with IC50 about 240. 56 µg/mL (A-549), 202.94 µg/mL (HCT-116), and 154.44 µg/mL (MCF-7). The in-silico approach showed that D. flabellifolia identified compounds bound 1HD2, 2XCT, 2QZW, and 3LN1 with high affinities, which together with molecular interactions and the bond network satisfactorily explain the experimental results using antimicrobial, antioxidant, and anticancer assays. The obtained results highlighted the ethnopharmacological properties of the rare desertic D. flabellifolia plant species growing wild in Hail region (Saudi Arabia).

Dried samples characterization and determination of total phenol and flavonoid of ethanol extract from Musa paradisiaca l. fruit peel

Background: Bananas are a widely consumed food in Indonesia. However, after consuming bananas, the skin is typically discarded since it is seen as useless or of no use. The phenolic and flavonoid compounds contained in banana peel have many health benefits. Aim: The purpose of this study was to characterize dried samples and investigate the phenol and flavonoid content of the peel of Musa paradisiaca L. Method: The determination of dried samples' characteristics, including water content, water-soluble extract content, ethanol-soluble extract content, total ash content, and acid-insoluble ash content. The extraction of peels was performed by maceration with 70% ethanol. Using UV-Vis spectrophotometry, the phenolic and flavonoid content of a sample was determined. Total phenol is given as gallic acid equivalent (GAE) (mg/g), whereas total flavonoids are expressed as quercetin equivalent (QE) (mg/g). Results: The results indicated that the dried form of banana peel exhibits a number of characteristics that match the standards. The flavonoid concentration was 10.92 mg QE per gram of extract, whereas the total phenol concentration was 47.82 mg GAE per gram of extract. Conclusion: The characteristics of dried samples met the standards. In addition, the peel extract's total phenol and flavonoid content was 47.82 ± 2.61 GAE/g extract and 10.92 ± 0.54 mg QE/g extract, respectively.

Analysis of total phenolics and flavonoids content from methanol extract of Caesalpinia bonduc (L.) Roxb. seeds and antioxidant activity assay

Caesalpinia bonduc (L.) Roxb. seed is known as gorek seed contain secondary metabolites such as alkaloids, tannins, flavonoids, and phenolics, due to the content of these secondary metabolites so that this plant has antioxidant activity. This study aimed to determine total phenolic and flavonoid contents of methanol extract of gorek C. bonduc seeds as well as antioxidant activity. Extraction of gorek C. bonduc seeds was carried out with methanol, then quantitative determination of total phenolic by the Folin-Ciocalteu method as Gallic Acid Equivalent (GAE)/gram of extract, flavonoid content by AlCl3 method as Quercetin Equivalent (QE)/gram of extract, and in vitro antioxidant activity with DPPH (2,2-diphenyl-1-picrylhydrazyl) method was in IC50 (inhibition concentration). Based on the results of research, the phytochemical screening of methanol extract of gorek C. bonduc seeds showed alkaloids, flavonoids, saponins, tannins, and phenolics. The determination of the total phenolic and flavonoid content were obtained 0.55 ± 0.02 mgGAE/g and 0.50 ± 0.02 mgQE/g, respectively. The antioxidant activity of methanol extracts and ascorbic acid showed IC50 values were 3770.77 ppm and 3.36 ppm respectively.