Maximum Antioxidant Activity Research Articles

CHEMICAL ANALYSIS AND BIOLOGICAL ACTIVITY OF TURKESTAN SOAPROOT ALLOCHRUSA GYP-SOPHILOIDES (REGEL) SCHISCHK GROWING IN THE SOUTH OF KAZAKHSTAN

Allochrusa gypsophiloides (Regel) Schischk. Turkestan soaproot (TSR), a Central Asian endemic has commercial value as a producer of triterpene saponins. Spectrophotometric determination of saponins was carried out in the roots and the aerial part of wild plants during vegetation in the south of Kazakhstan. The level of saponins, phenols, and flavonoids in the seeds, aerial parts, and roots was assessed. The following ascending order in the saponins content: seeds-aerial part-root, was revealed. An increase in the saponins levels in the roots during the growing season with a maximum of 9.6% in fruiting was established. A high saponins amount (6%) was detected in the aerial part during the flowering which decreased twice at the fruiting. The antioxidant activity and foaming index of the total ethanol extracts from the initial and deposited plant materials were determined. The maximum antioxidant activity (35.5%) and antiradical properties (IC50 1480) in vitro were found in extracts from the aerial part with the highest content of flavonoids and phenols. It was revealed that long-term storage of roots contributes to an increase in saponins levels and in their surfactant properties. The data obtained indicate the possibility of alternative use of the aerial parts of Allochrysa gypsophiloides at the flowering for obtaining triterpene saponins and phenolic substances with antioxidant activity.

Green Synthesis of Zinc Oxide Nanoparticles Using Chamomile and Green Tea Extracts and Evaluation of Their Anti-inflammatory and Antioxidant Activity: An In Vitro Study.

Background An important field of study in contemporary material science is the synthesis of metallic nanoparticles. The wide range of uses for zinc nanoparticles in industries like diagnosis and antimicrobial catalysis has sparked particular interest in them. Plant extracts are used to synthesize zinc nanoparticles, opening up a wide range of potential applications. Hence, the current study aims to demonstrate the anti-inflammatory and antioxidant activity of zinc oxide nanoparticles mediated by green tea and chamomile tea combination. Materials and methods Leaves of green tea and chamomile tea were combined in a ratio of 1 gram each. To make a 1-molar solution of the extract, the weighted extracts were thoroughly mixed with 100 ml of distilled water in conical flasks. To synthesize nanoparticles, a magnetic stirrer and an orbital shaker were used alternately with an extract of chamomile and green tea, 0.016 g of zinc oxide, and 90 ml of distilled water at 900 rpm. By using an albumin denaturation assay, the synthesized nanoparticles' anti-inflammatory activity was assessed. Bovine serum albumin (BSA) and egg albumin (EA) were the reagents used in the assay. The antioxidant activity of zinc oxide nanoparticles, which is mediated by chamomile and green tea, was determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and H2O2 (hydrogen peroxide) radical scavenging assays. An independent sample t-test was done to compare the anti-inflammatory and antioxidant potentials of zinc oxide nanoparticles mediated by green tea and chamomile tea combination and control using SPSS Statistics version 22.0 software (IBM Corp. Released 2013. IBM SPSS Statistics for Windows, Version 22.0. Armonk, NY: IBM Corp.), and any p-value less than 0.05 was considered statistically significant. Results In this study, the anti-inflammatory activity and antioxidant activity were assessed at variable concentrations of the reaction mixture. The combination of chamomile and green tea extracts mediated by zinc oxide nanoparticles at 50μl concentration showed the maximum anti-inflammatory activity and antioxidant activity at 87% inhibition, respectively. Conclusion Both assays successfully demonstrated better anti-inflammatory and antioxidant activity of zinc oxide nanoparticles mediated by chamomile and green tea combination when compared to control and, therefore, could be evaluated as a potential therapeutic agent.

Stabilization of the Antioxidant Properties in Spray-Dried Microcapsules of Fish and Chia Oil Blends.

Even with healthy foods, there is still a need to protect the functionality during processing. The stabilization and enrichment of fish oil (FO) extracted from fish fillets using solvent extraction might make this healthy oil more available. FO was stabilized by mixing it with chia seed oil (CSO) at 50:50 at room temperature. The antioxidant properties of the blends were evaluated using the total phenolic content (TPC), free radical scavenging activity (DPPH), ferric reducing antioxidant potential (FRAP), and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) activities with FO and CSO as controls. The blends of FO and CSO increased the oxidative stability, while FO was the most susceptible to degradation. The stability and bioactivity of antioxidants against environmental factors were improved by using encapsulation. Response surface methodology (RSM) was used to optimize spray-drying operating conditions for spray-dried microcapsules (SDMs). The independent variables were the inlet air temperature (IAT), which varied from 125 to 185 °C; wall material (WM) concentration, which varied from 5 to 25%; pump speed (PS), which varied from 3 to 7 mL/min; and needle speed (NS), which varied from 3 to 11 s. The results indicated that the maximum antioxidant activity of SDM was obtained at 140 °C IAT, 10% WM, 4 mL/min PS, and 5 s NS, while the minimum value was obtained at 170 °C IAT, 20% WM, 6 mL/min PS, and 9 s NS. The IAT had a significant effect on the antioxidant activities, and the stability of SDMs was increased. These SDMs can be used in the formulation of food matrices due to their therapeutic and nutritional properties.

The Antioxidant Activities In Vitro and In Vivo and Extraction Conditions Optimization of Defatted Walnut Kernel Extract.

The objective of this study was to determine the antioxidant activities of defatted walnut kernel extract (DWE) and whole walnut kernel extract (WE) in vitro and in vivo. Three spectrophotometric methods, DPPH, ABTS, and FRAP, were used in in vitro experiments, and mice were used in in vivo experiments. In addition, response surface methodology (RSM) was used to optimize reflux-assisted ethanol extraction of DWE for maximum antioxidant activity and total phenolic content. The results of in vitro experiments showed that both extracts showed antioxidant activity; however, the antioxidant activity of DWE was higher than that of WE. Both extracts improved the mice's oxidative damage status in in vivo studies. An ethanol concentration of 58%, an extraction temperature of 48 °C, and an extraction time of 77 min were the ideal parameters for reflux-assisted ethanol extraction of DWE. The results may provide useful information for further applications of defatted walnut kernels and the development of functional foods.

Effects of supplementation with algerian Nigella sativa bioactive compounds on quality of yogurt

The characteristics of Algerian Nigella sativa (Ns) seeds were investigated after extraction with three aqueous ethanol concentrations (40, 60 and 80%) at three seed concentrations (2.5, 5 and 7.5%) referred as T, F and S, respectively. Aqueous ethanol extraction (40%) at 2.5 and 5% Ns seed concentration [T40% and F40%] had the highest total phenolic and total flavonoid contents. Higher seed (7.5%) and aqueous ethanol concentrations (60 and 80%) extracts [S60% and S80%] exhibited the maximum antioxidant activity. T80% and S40% extract exerted high antimicrobial activity against Escherichia coli and Staphylococcus aureus, respectively. Four stirred yogurts formulated with 0, 0.5, 1 and 2% of S60% extract were evaluated for physicochemical and sensory properties; two of these formulated yogurts were further investigated for stability under refrigerated storage (4 °C for 21 days). Yogurt formulated with 0.5% of S60% extract exhibited the highest antioxidant activity, high titratable acidity, low pH and increasing syneresis during storage. However, the control yogurt had higher syneresis than the fortified yogurt (60 vs 46% at 21 days storage).

Chemical composition, antioxidant, anti-inflammatory, anti-diabetic activities, in silico PASS, ADMET study and molecular docking of essential oils from Cinnamomum glanduliferum at various drying conditions

Cinnamomum glanduliferum is an aromatic evergreen plant of family Lauraceae. In this work, various drying conditions like sun, shade and oven (at 40°C and 50°C) were used to explore the variation in the essential oil composition, antioxidant, anti-inflammatory, anti-diabetic activities, as well as in silico ADMET and molecular docking study of leaves of the C. glanduliferum species. Fresh and dried samples were hydro-distilled using Clevenger equipment, and the resulting essential oil was analysed by GC and GC-MS. Egg albumin was used to perform in-vitro anti-inflammatory action. The antioxidant capacity was evaluated using DPPH radical scavenging, H2O2 radical scavenging, and iron metal chelating activities. α-Amylase inhibition activity was also performed on all samples. 1,8-Cineole (44.26 to 58.80%), sabinene (16.68 to 20.50%), and α-terpineol (9.04 to 10.50%) were the main components of the oils of the dried samples. The shade-dried sample had the highest essential oil yield, followed by the sun-dried, oven-dried at 50°C, and oven-dried at 40°C. The maximum antioxidant and α-amylase inhibitory activities were demonstrated by oven -dried plant material at 40°C, whereas the lowest activities were exhibited by an oven sample at 50°C. On the other hand, oven dried samples at 50°C had the highest anti-inflammatory activity; while oven dried samples at 40°C had the lowest. Drying procedures influenced essential oil composition and yield. The sample dried in an oven at 40°C preserved the most 1,8-cineole, indicating it the most effective drying method for C. glanduliferum. Furthermore, the oven 40°C sample demonstrated significant antioxidant and anti-diabetic activities.

Bioconversion of chicken feather wastes into value added bioactive peptide by Geobacillus thermodenitrificans PS41 strain

A need for an economically attractive method for feather waste utilization, lead us to research for a new effective technology assuring an outcome of valuable product. In this study, keratinase producing Geobacillus thermodenitrificans a bacterial isolate PS41 was used to convert feather waste into bioactive peptides. Feather peptide under 15 kDa had shown a maximum antioxidant activity and it was identified as radical oxygenase of Propionibacterium acne. The purified feather peptide from PS41 showed antibacterial activity, anticancer activity against human alveolar basal epithelial cells, and larvicidal activity against Aedes aegypti, Anopheles stephensi, and Culex quinquefasciatus larvae in comparison to non-targeted organisms like zebra fish embryo and brine shrimp. The wound healing rate was significantly higher in peptide treated groups in comparison to standard and control groups respectively. Peptide treated wound had exhibited promisingly complete healing after 5 days of treatment in cat fish model and after 12 days of treatment in wistar albino rat. Histological analysis on experimental animal model showed that the tissue regenerating efficacy of peptide was more than the standard.

The Effect of Storage Conditions on potential antioxidant activity of orange and Pomelo Juice

Appropriate storage conditions seem critical to preserving the antioxidant activity of fruits and veggies. This study was assessed to determine the effect of storage conditions on the antioxidant activity of orange and pomelo juice. The pomelo and orange juice samples were stored for 30 days at room(25°C) temperature, chilling (5°C), and frozen (-4 °C) temperature, chilling, and frozen temperature. The antioxidant activity of pomelo and orange juice was determined by the DPPH assay method by using a UV-visible spectrophotometer. The storage time and temperature significantly alter the antioxidant activity of the pomelo and orange juice with a significant difference of (p<0.05). The antioxidant activity of pomelo and orange juice decrease from 300.23 to 160.14 µmol TE / 100 g and 232.50 µmol to 101.76 TE / 100 g, respectively, at room temperature. Similarly, the activity reduced from 300.23 to 266.22 µmol TE / 100 g and 232.50 to 215.18 µmol TE / 100 g respectively at the chilling condition, which was considered less as compared to room temperature. Interestingly, the pomelo juice and orange retain 90% and 94% of its antioxidant activity from 300.23 to 270.55 µmol TE / 100 g and 232.50 to 218.10 µmol TE / 100 g. Hence, the frozen condition is best for retaining the maximum antioxidant activity in both members of the citric family. Therefore, storage conditions are essential factors for fruits quality and antioxidant potential.

Fabrication and characterization of Kappaphycus alvarezii biomass based thin-film and its applications

The present investigation is aimed at developing films using biomass of seaweed Kappaphycus alvarezii blended with natural additives both without glycerol (K) and with glycerol (KG) and to use the same in enhancement of shelf life of tomatoes. The natural additives used were Azadirachta indica oil (K1), A. indica leaves extract (K2), Citrus limon leaves extract (K3), A. indica gum (K4), Prunus amygdalus gum (K5), Moringa indica gum (K6) and the extract and oil of A. indica leaves (K7). The result showed that the moisture content ranged from 10.3 ± 1.2–19.9 ± 0.4%, thickness 0.01–0.10 mm, and swelling index above 45% in all the prepared films. The tensile strength and transparency were higher for K6, KG6, K and KG respectively. KG6 and K3 films showed maximum phenolic content, antioxidant and antimicrobial activity. The promising results of current investigation proved the suitability of the film in enhancing the shelf life of tomatoes to 14 days at room temperature.

Performance evaluation of different grown ber (Ziziphus mauritiana) cultivars under low-temperature storage

ABSTRACT Ber (Ziziphus mauritiana), also known as “Chinese date” or “jujube,” belongs to the Rhamnaceae family. The current research was designed to assess the effect of storage temperatures (5°C and 15°C) on ascorbic acid content, reducing sugar content, and titratable acidity of four ber (Z. mauritiana) varieties, i.e. Karela, Aakash, Pak white, and Dil-Bahar. For this purpose, fresh ber (Z. mauritiana) varieties were acquired from the Regional Agriculture Research Institute (RARI), Bahawalpur. In the first phase, these ber (Z. mauritiana) varieties were subjected to proximate analysis of reducing sugar contents, titratable acidity, antioxidant activity, and total phenolic contents. Maximum total phenolic content (144.38 ± 0.03 mgGAE/100 g) and antioxidant activity (39 ± 0.06%) were observed in Dil-Bahar variety. In the second phase, stored ber (Z. mauritiana) varieties were subjected to a storage study at 0, 7th, and 14th days for comparative evaluation based on titratable acidity, reducing sugar content, and ascorbic acid content. The results showed that the fruits stored at 5°C showed a maintained level of ascorbic acid content (31.26 ± 0.02 mg/100 g), reducing sugars (41.25 ± 0.02%), and titratable acidity (3.36 ± 0.01%) in Karela. On the contrary, Karela stored at 15°C showed a reduction in ascorbic acid content (28.12 ± 0.02 mg/100 g) and titratable acidity (1.21 ± 0.01%) and an increase in reduced sugar content (46.48 ± 0.03%). Moreover, Dil-Bahar variety showed higher ascorbic acid content (51.69 ± 0.05 mg/100 g), titratable acidity (3.51 ± 0.02%), and reducing sugar content (33.29 ± 0.01%) at 5°C. It was concluded that cultivars showed the best results at low storage temperatures of 5°C.

Antioxidant, photo-catalytic activities of biogenic Cu-Ni nano-composite using Terminalia chebula extract

Copper-nickel (Cu-Ni) Bimetallic nanoparticless have been synthesized in an eco-friendly manner using an aqueous extract of the polyphenol-rich Terminalia chebula fruit. The UV–Visible spectral analysis showed that a characteristic peak at λ max 530 nm which confirms the formation of Copper-Nickel (Cu-Ni) Bimetallic nanoparticles and that it was monodisperse. The FTIR and EDX studies revealed that polyphenols in the aqueous extract of Terminalia chebula were utilized for producing the Cu-Ni Bimetallic nanoparticles. The XRD studies confirmed the resultant Copper-Nickel (Cu-Ni) compound was FCC. The sphere shape was confirmed by TEM analysis, with an average size of 20.6 nm. The objective of this study was to evaluate the photocatalytic and antioxidant properties of the biosynthesized Copper-Nickel (Cu-Ni) Bimetallic nanoparticles. Both Congo red dye and Eosin-Y are known to cause cancer. They were broken down by a catalyst in 30 and 60 min, respectively, and their degradation was found to follow first-order dynamics. Maximum antioxidant activity against DPPH was observed at 150 µg/ml, with an EC50 of 78.51 and an EC90 of 65.01 µg/ml.

SUBCRITICAL WATER AS A TOOL FOR OBTAINING EXTRACTS OF SECONDARY PLANT METABOLITES WITH HIGH ANTIOXIDANT ACTIVITY FROM GINKGO BILOBA L. LEAVES

Extracts of secondary plant metabolites (SPM) with high antioxidant activity (AOA) are gaining more and more attention as biologically active additives. To obtain them, methods of "green chemistry" are increasingly being considered. In the present work, to obtain extracts with high antioxidant activity enriched of polyphenols from the leaves of Ginkgo biloba (GB), medium of a subcritical water (SCW) was used in the temperature range from 100 to 220 °C. The use medium of the SCW for extraction processes allows not only to increase the extraction of SPM from the plant matrix, but also to achieve a change in the phytochemical profile of the obtained extracts.
 The polyphenol profile of extracts leaf’s GB was studied by UV/Vis spectrophotometry, as well as the dependence of the content of SPM, in the form of the sum of polyphenolic compounds (including flavonoids) and AOA of extracts, on the extraction method: in medium of SCW or water-alcohol (traditional) extraction. It has been shown that the content of polyphenolic compounds and the AOA of extracts depend on the extraction conditions (temperature of SCW). It was demonstrated that the extract obtained from leaves of GB in SCW at 220 °C contains the highest amount of polyphenolic compounds and demonstrates the maximum AOA (EC50=34.7 μg/ml) among the obtained extracts. The presented results demonstrate the promise of using SCW to obtain extracts from leaves of GB with a high content of polyphenols for the development of pharmaceuticals and food supplements with high AOA.

Exploring promising electron-shuttling characteristics of Perilla frutescens and potential anti-viral activity via bioenergy generation in microbial fuel cells

To decipher synergistic interactions of herbal medicine for disease treatment, prior studies showed that electron-shuttling catalysis and bioenergy-generating stimulation endow immense significance to the efficacy of herbal medicines on disease treatment. In fact, the electrochemical activity of these herbal medicines is even associated with the antiviral capabilities of traditional Chinese medicine (TCM), making it an effective preventive remedy against virus-caused infections (e.g., COVID-19). Formerly screened Perilla frutescens was thus explored for its electron shuttling capability and bioenergy generation performance to confirm its potential for anti-COVID19 treatment. To evaluate the bioenergy-generating and electron-mediating characteristics of P. frutescens, microbial fuel cells (MFCs) were used as the platform of evaluation. The different extraction process was performed to determine the most promising ES-abundant herbal extract that exhibited maximum bioenergy production and significant antioxidant activity. The findings indicated that the essential oil-removed P. frutescens water extract (GPF-S-H2O) performed the optimal stimulating bioenergy generation and antioxidant activity, as revealed by power density measurement, DPPH, and FRAP assay. The removal of volatile compounds from the herb significantly improved its electrochemical activity. GPF-S-H2O in appropriate amount could generate the maximal bioenergy expression and efficient electron transfer.

Evaluation of cinnamaldehyde derivatives as potential protective agents against oxidative-stress induced myotube atrophy using chemical, biological and computational analysis

Skeletal muscle atrophy, associated with increased morbidity, mortality and poor quality of life, is a metabolic disorder with no FDA approved drug. Oxidative stress is one of the key mediators of atrophy that influences various cell signaling molecules. The goal of this study is to identify potential antioxidant agents that could be used to treat atrophy. In this study in vitro and in situ screening of different cinnamaldehyde (CNA) derivatives for their antioxidant effects was done along with computational analysis to understand the relationship between their chemical structure and biological activity.Data show that 2-hydroxycinnamaldehyde (2HCNA) worked better than other CNA analogues at physiological pH, while 4-Fluoro-2-methoxycinnamaldehyde (4FoCNA) showed the maximum antioxidant activity under acidic conditions. However, these derivatives (2HCNA and 4FoCNA) were found to be toxic to the cultured myotubes (mature myofiber) under both physiological and pathophysiological conditions. Immunofluorescence, bright-field microscopic and biochemical studies conducted using live C2C12 cells showed that pre-incubation with other CNA analogues i.e. 2-methoxycinnamaldehyde (2MeCNA) and 2-benzyloxycinnamaldehyde (2BzCNA) not only maintained the normal morphology of myotubes but also protected them from H2O2-induced atrophy. These compounds (2MeCNA and 2BzCNA) showed higher stability and antioxidant potential, as indicated by computer simulation data analyzed by Density Functional Theory (DFT) based molecular modeling. Overall, the chemical, biological, and computational studies reveal the therapeutic potential of CNA analogues (BzCNA and MeCNA) against oxidative-stress induced muscle atrophy in C2C12 cells.

Microwave-assisted extraction of shikimic acid from different morphological parts of water hyacinth (Eichhornia crassipes)

Water hyacinth is a proliferative aquatic weed which destructs biodiversity. Though water hyacinth is a notorious weed, it is a useful resource if used judiciously. One of the important compounds in water hyacinth is shikimic acid, a precursor to produce antiviral drug oseltamivir phosphate. A greener extraction of shikimic acid, phenolic compounds and estimation of antioxidant activity of extract were performed using microwave-assisted extraction from the different morphological parts of water hyacinth. Impact of parameters such as extraction time, solvent volume, temperature and power has been studied. Among various parts of the plant, stem contained higher shikimic acid (2.70%, w/w), leaves had higher total phenolic content (12.15 mg GAE/ g biomass) and extract from stem exhibited the maximum antioxidant activity (75.13%). Further, the optimization of process parameters using central composite design was employed to maximize the yield of shikimic acid (2.61%, w/w) which was achieved at 1.08 min, 45 °C, and 30 mL. Although Ultrasound-assisted extraction has provided a higher yield (3.2%, w/w) of shikimic acid compared to microwave-assisted extraction, the extraction time was reduced by 96% in case of microwave-assisted extraction, thereby reducing energy consumption, utility requirement and carbon emission.

Synthesis, In Silico Studies, and Antioxidant and Tyrosinase Inhibitory Potential of 2-(Substituted Phenyl) Thiazolidine-4-Carboxamide Derivatives.

Heterocyclic nuclei have shown a wide variety of biological activities, highlighting their importance in drug discovery. Derivatives of 2,4-subsituted thiazolidine have a structural similarity with the substrates of tyrosinase enzymes. Hence, they can be used as an inhibitor to compete against tyrosine in the biosynthesis of melanin. This study is focused on design, synthesis, biological activities, and in silico studies of thiazolidine derivatives substituted at positions 2 and 4. The synthesized compounds were evaluated to determine the antioxidant activity and tyrosine inhibitory potential using mushroom tyrosinase. The most potent tyrosinase enzyme inhibitor was compound 3c having IC50 value 16.5 ± 0.37 µM, whereas compound 3d showed maximum antioxidant activity in a DPPH free radical scavenging assay (IC50 = 18.17 µg/mL). Molecular docking studies were conducted using mushroom tyrosinase (PDB ID: 2Y9X) to analyze binding affinities and binding interactions of the protein-ligand complex. Docking results indicated that hydrogen bonds and hydrophobic interactions were mainly involved in the ligand and protein complex. The highest binding affinity was found to be -8.4 Kcal/mol. These results suggest that thiazolidine-4-carboxamide derivatives could serve as lead molecules for development of novel potential tyrosinase inhibitors.

Synergistic effect of microwave heating and thermosonication on the physicochemical and nutritional quality of muskmelon and sugarcane juice blend

Melons (Cucumis melo L.) are highly popular due to its delicate and delightful flavor in the worldwide. However, the flavor of the melon juice was easily affected by thermal treatments and unpleasant cooking smell during production process. Sugarcane (Saccharum officinarum) juice is a proven nutritious beverage with high levels of antioxidants, polyphenols, and other beneficial nutrients. Due to its low sugar content, combined with sugarcane, muskmelon-sugarcane blend juice gives an appealing and exotic drink. The research was planned to evaluate the effect of thermo-sonication (20 kHz, 70% amplitude, 5, 10 and 15 min) and microwave (90 °C, 400 W, 120 sec) on physicochemical parameters including pH, titratable acidity, total soluble solids (TSS), total phenolic contents (TPC), total flavonoid contents (TFC) and antioxidant capacity of muskmelon and sugarcane juice blend, during storage of 90 days at refrigeration (4±1 °C). The statistical results showed that synergism of sonication and microwave treatments had a significant (p ≤ 0.05) influence on pH, TSS, titratable acidity, TPC, TFC and antioxidant capacity. T3 (15 min of sonication and 120 s of microwave) showed the maximum TSS (12.00±0.40 °B), pH (5.07±0.02), TPC (484.33±10.41 mg GAE/100 mL), TFC (261.73±11.32 mg CE/100 mL), and antioxidant activity (381.62±17.72 µg AAE/100 mL), as compared to untreated samples. Thermosonication for 15 min caused maximum retention of TPC, TFC and antioxidant capacity of blend juice during 90 days of storage, whereas in untreated samples these parameters were found highly decreased during storage. Thus, sonication and microwave can be recommended as an alternative to both conventional pasteurization processes and chemical preservatives.

Optimization of Conditions for Microwave-Assisted Extraction of Polyphenols from Olive Pomace of Žutica Variety: Waste Valorization Approach.

Olive pomace is a by-product of olive oil production that is toxic to the environment. The purpose of this study was to evaluate the methods of olive pomace valorization through the implementation of novel technology, the so-called microwave-assisted extraction process. To determine the total polyphenol content (TPC) and antioxidant activity (AA), polyphenol extraction using MAE was performed. Response surface methodology was used to determine the best extraction conditions, whereby the effects of three factors, solid ratio (g/50 mL), time (s), and power (W), were measured. The ferric reducing antioxidant power (FRAP) method was used to assess AA, whereas the spectrophotometric Folin-Ciocalteu (FC) method was used to determine TPC. The highest TPC of 15.30 mg of gallic acid equivalents per gram of dried weight (mg GAE/gdw) was generated after 105 s at 450 W, with a solid concentration of 1 g/50 mL, while the maximum AA was 10 mg of ascorbic acid equivalents per gram of dried weight (mg AAE/gdw). Numerical optimization revealed that 800 W, 180 s, and 1 g/50 mL were the best conditions for obtaining maximum TPC and AA.

ANTIBACTERIAL POTENTIAL AND PHYTOCHEMICAL INVESTIGATION OF MEDICINAL PLANT (EUPHORBIA HIRTA LINN)

Euphorbia hirta linn (E. hirta) is a medicinal plant, also known as asthma weeds which are mainly used against human pathogenic diseases such as digestive tract problem, asthma, coughs, diarrhea, dysentery, typhoid fever, inflammation, chronic bronchitis, and other pulmonary disorders. The native of these plants is in Asia, Australia, and East and West Africa. In the present study antibacterial activities, antioxidant activities, and phytochemicals were estimated from 20% isopropanol and aqueous extract of different parts (leaf, fruit, stem, root) of E. hirta. The maximum antioxidant activity, Phenolic contents, and flavonoids showed 0.418 mg/ml in aqueous fruit extract, 0.176 and 0.43 mg/ml in aqueous leaf extract respectively. Some other bioactive compounds were also observed from both 20% extracts of different segments of E. hirta qualitatively. Furthermore, some biomolecules were estimated in higher amounts from E. hirta plant extracts as total sugar 0.168 mg/ml from the aqueous extract of the fruit, total protein 0.453mg/ml from isopropanol extract of the fruit, and the reducing sugar contents 0.08 mg/ml from aqueous root extract. Different parts of the understudy plant (E. hirta) extracts exhibited antibacterial activity against E. coli and K. pneumonia. Whereas only aqueous and isopropanol extract of root and stem and aqueous extract of fruit showed negative antibacterial activity against S. pneumonia. The result suggested that E. hirta may be used for the treatment of different infectious diseases due to the presence of different phytochemicals.

The Use of Carbon Dioxide as a Green Approach to Recover Bioactive Compounds from Spent Coffee Grounds.

Spent coffee grounds (SCG) contain bioactive compounds. In this work, given the increasing demand to valorize waste and use green technologies, SCG were submitted to extraction by carbon dioxide (CO2) in supercritical and liquid conditions. The extraction parameters were varied to obtain the maximum yield with the maximum antioxidant activity. The use of supercritical and liquid CO2 with 5% ethanol for 1 h provided yields (15 and 16%, respectively) comparable to those obtained by control methods for 5 h and extracts with high total polyphenolic contents (970 and 857 mg GAE/100 g oil, respectively). It also provided extracts with DPPH (3089 and 3136 μmol TE/100 g oil, respectively) and FRAP (4383 and 4324 μmol TE/100 g oil, respectively) antioxidant activity levels higher than those of hexane extracts (372 and 2758 μmol TE/100 g oil, respectively) and comparable to those of ethanol (3492 and 4408 μmol TE/100 g oil, respectively). The SCG extracts exhibited linoleic, palmitic, oleic, and stearic acids (predominant fatty acids) and furans and phenols (predominant volatile organic compounds). They were also characterized by caffeine and individual phenolic acids (chlorogenic, caffeic, ferulic, and 3,4-dihydroxybenzoic acids) with well-known antioxidant and antimicrobial properties; therefore, they could be used in the cosmetic, pharmaceutical, and food sectors.