scholarly journals Antioxidant Activity of `Rio Red', `Marsh White', and Commercial Juice In Vitro Model Systems

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1135B-1135
Author(s):  
Basavaraj Girennavar ◽  
Bhimanagouda Patil ◽  
Guddadarangavvanahally Jayaprakasha
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Ethyl Acetate ◽  
Antioxidant Capacity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Model Systems ◽  
Scavenging Activity ◽  
Plant Materials ◽  
Dpph Method

Antioxidant activity is widely used as a parameter to characterize different plant materials for potential health benefits. This activity is related with compounds capable of protecting a biological system against the harmful effect of reactions that can cause excessive oxidation, involving reactive oxygen and nitrogen species (RONS). There has been growing interest in the beneficial health effects of consuming fruits and vegetables. Mainly, the presence of lycopene, ascorbic acid, and phenolic antioxidants is believed to have the protective mechanism. The free radical-scavenging activities of grapefruit extract of `Rio Red', `Marsh White', and commercial juice were extracted with different solvents, such as hexane, ethyl acetate, and chloroform. The dried extracts were screened for their radical scavenging activity using the α,α -diphenyl-β-picrylhydrazyl (DPPH) method. The ethyl acetate extracts of commercial juice and `Marsh White' were found to possess more radical scavenging activity compared with the other two extracts. However, chloroform extracts of `Rio Red' grapefruit were the most active, which may be ascribed to the presence of more lycopene. Furthermore, the antioxidant capacity of `Rio Red' and `Marsh White' extracts was assayed through the phosphomolybdenum method and expressed as equivalent to ascorbic acid (μmol·g-1 of the extract). The order of antioxidant capacity for `Rio Red' extracts was found to be hexane > chloroform > ethyl acetate, while the order for `Marsh White' was chloroform > hexane > ethyl acetate. The results indicate that the extent of antioxidant activity of the extract is in accordance with the amount of lycopene/phenolics present in that extract; commercial juice and `Rio Red' may provide a good source of antioxidants.

scholarly journals Phenolics and Carotenoids Contribute to Antioxidant Activity in Navel Orange

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1000A-1000
Author(s):  
G.K. Jayaprakasha ◽  
Clark Wilson ◽  
Bhimanagouda S. Patil
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Ethyl Acetate ◽  
Antioxidant Capacity ◽  
Fruits And Vegetables ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Navel Orange ◽  
Scavenging Activity ◽  
Freeze Dried

Consumption of fruits and vegetables has been associated with reduced risk of disease, such as neurodegenerative disorders and certain forms of cancer, and aging. Antioxidants prevent the damage to macromolecules and cells by interfering with the free radicals. Several natural compounds that posses antioxidant activity have been reported from plant sources and are commercially promoted as nutraceuticals. Citrus fruits contain certain bioactive compounds such as phenolics, flavonoids, limonoids, carotenoids, and ascorbic acid. In this context, navel oranges were freeze-dried and extracted with five different solvents, such as hexane, ethyl acetate, acetone, methanol, and 8 methanol: 2 water. The extracts were dried under vacuum and screened for their radical scavenging activity using the 1,1-diphenyl-2-picrylhydrazyl method at 250, 500, and 1000 ppm. The methanol: water and methanol extracts of navel orange were found to be maximum (92.9%) and minimum (63.89%) radical scavenging activity at 1000 ppm. Furthermore, the antioxidant capacity of all extracts was assayed through the phosphomolybdenum method and expressed as equivalent to ascorbic acid (μmol/g of the extract). The order of antioxidant capacity for navel orange extracts was found to be ethyl acetate > acetone > methanol: water > methanol > hexane. It seems that the antioxidant capacity of the extracts is in accordance with the amount of phenolics/lycopene present in each fraction and may provide a good source of antioxidants. This project is based upon work supported by the USDA–CSREES under Agreement USDA IFAFS #2001-52102-02294 and USDA #2005-34402-14401 “Designing Foods for Health” through the Vegetable and Fruit Improvement Center.

Effect of Metal Ions (Cu2+/Fe2+) on the Antioxidant Activity of L-Ascorbic Acid-Glycine Model System

2011 ◽  
Vol 396-398 ◽  
pp. 28-31
Author(s):  
Cheng Yi Lei ◽  
Da Zhai Zhou ◽  
Rong Zhao ◽  
Qi Hui Deng ◽  
Ai Nong Yu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Maillard Reaction ◽  
Antioxidative Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Model System ◽  
Model Systems ◽  
Scavenging Activity ◽  
Metal Concentrations

The influence of Cu2+, Fe2+ on the Maillard reaction were studied by heating L-ascorbic(ASA) and glycine (Gly) solutions adjusted to pH 5 at 120±2°C for 140 min in an oil bath. The presence of metals affected the intensity of browning and intermediate products, as monitored by absorbance at 420 nm and absorbance at 294 nm, sharply increased with the increase of metal concentrations applied (0.000M, 0.005M, 0.010M, 0.015M, 0.020M). Thereafter, slight increases were observed up to 0.020M. Antioxidative activity of all MRPs derived from ASA-Gly model systems sharply increased at 0.015M (P < 0.05) and slightly changes in activity were found with increasing metal concentrations up to 0.020M. Moreover, radical-scavenging activity correlated well with browning intensity and absorbance at 294 nm.

scholarly journals Antioxidant Activity in Rheum emodi Wall (Himalayan Rhubarb)

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2555
Author(s):  
Sang Koo Park ◽  
Yoon Kyung Lee
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Ethyl Acetate Fraction ◽  
Total Phenolic ◽  
Scavenging Activity ◽  
Polyphenol Content ◽  
Abts Assay ◽  
Ic50 Values

Using natural products as antioxidant agents has been beneficial to replace synthetic products. Efforts have been made to profile the antioxidant capacities of natural resources, such as medicinal plants. The polyphenol content of Himalayan rhubarb, Rheum emodi wall, was measured and the antioxidant activity was determined using DPPH and ABTS+ assay, and the oxidative stress was assessed using SOD enzymatic assay. Five different solvent fractions, n-hexane, n-butanol, ethyl acetate, dichloromethane, and water, were used for screening the antioxidant capacity in effort to determine the optimum extraction solvent. The total phenolic contents for R. emodi fractions ranged from 27.76 to 209.21 mg of gallic acid equivalents (GAE)/g of dry weight. DPPH and ABTS+ assay results are presented into IC50 values, ranged from 21.52 to 2448.79 μg/mL and 90.25 to 1718.05 μg/mL, respectively. The ethyl acetate fraction had the highest antioxidant activity among other fractions. Also, n-butanol and water fractions showed significantly lower IC50 values than the positive control in DPPH radical scavenging activity. The IC50 values of SOD assay of fractions ranged from 2.31 to 64.78 μg/mL. A similar result was observed with ethyl acetate fraction showing the highest SOD radical scavenging activity. The study suggests that the ethyl acetate fraction of R. emodi possess the strongest antioxidant activity, thus the most efficient in extracting antioxidant contents. Moreover, a highly significant correlation was shown between total polyphenol content and antioxidant activity screening assays. The compounds related to the antioxidant activity of R. emodi were identified to myricitrin, myricetin 3-galloyl rhamnoside, and myricetin, which have not been reported in studies about R. emodi before.

scholarly journals Antioxidant and Anticancer Activities of Wampee (Clausena lansium(Lour.) Skeels) Peel

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
K. Nagendra Prasad ◽  
Jing Hao ◽  
Chun Yi ◽  
Dandan Zhang ◽  
Shengxiang Qiu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Total Phenolic ◽  
Liver Carcinoma ◽  
Scavenging Activity ◽  
Anticancer Activities

Antioxidant activities of wampee peel extracts using five different solvents (ethanol, hexane, ethyl acetate, butanol and water) were determined by using in-vitro antioxidant models including total antioxidant capability, 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging activity, reducing power, and superoxide scavenging activity. Ethyl acetate fraction (EAF) exhibited the highest antioxidant activity compared to other fractions, even higher than synthetic antioxidant butylated hydroxyl toluene (BHT). In addition, the EAF exhibited strong anticancer activities against human gastric carcinoma (SGC-7901), human hepatocellular liver carcinoma (HepG-2) and human lung adenocarcinoma (A-549) cancer cell lines, higher than cisplatin, a conventional anticancer drug. The total phenolic content of wampee fraction was positively correlated with the antioxidant activity. This is the first report on the antioxidant and anticancer activities of the wampee peel extract. Thus, wampee peel can be used potentially as a readily accessible source of natural antioxidants and a possible pharmaceutical supplement.

scholarly journals Determination of in vitro antioxidant activity of the leaves extracts of Ehretia pubescens

2020 ◽  
Vol 11 (4) ◽  
pp. 6262-6267
Author(s):  
Krishnamoorthy Meenakumari ◽  
Giridharan Bupesh ◽  
Mayur Mausoom Phukan
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Biological Properties ◽  
Scavenging Activity ◽  
Reducing Power Assay

The foods from plants were known to ensure against degenerative diseases and maturing because of their antioxidant activitycredited to their high content. Information on antioxidant activity of Indian medicinal plant is abundant. To the best of our knowledge, biological properties have not been accounted in the literature for this species of . As a point, this is the first results to assess the anti-oxidant activity of the plant which belongs to the family . The antioxidant activity of Methanol, , Ethyl acetate and Aqueous extracts of E. was determined using the DPPH free radical scavenging activity, ABTS radical scavenging activity and reducing power assay. The DPPH scavenging activity showed higher activity observed in extract (63%) of E. than (54%), (44%) and aqueous (30%). the ABTS assay inhibition in extract (58%) than (43%), (38%) and aqueous (32%) extracts. The reducing power assay of different extracts was increased in extract (54%) than (40%), (34%) and aqueous (28%) extracts. Overall, the and ethyl acetate extract had higher antioxidant properties than other extract. However, in this study, extracts exhibit great potential for antioxidant activity and may be useful for their nutritional and medicinal functions.

scholarly journals The Antioxidant and Antiproliferative Activities of 1,2,3-Triazolyl-L-Ascorbic Acid Derivatives

2019 ◽  
Vol 20 (19) ◽  
pp. 4735 ◽  
Author(s):  
Anja Harej ◽  
Andrijana Meščić Macan ◽  
Višnja Stepanić ◽  
Marko Klobučar ◽  
Krešimir Pavelić ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Hydrogen Atom Transfer ◽  
Breast Adenocarcinoma ◽  
Scavenging Activity ◽  
Activity Data ◽  
Oh Groups ◽  
Mcf 7

The novel 4-substituted 1,2,3-triazole L-ascorbic acid (L-ASA) conjugates with hydroxyethylene spacer as well as their conformationally restricted 4,5-unsaturated analogues were synthesized as potential antioxidant and antiproliferative agents. An evaluation of the antioxidant activity of novel compounds showed that the majority of the 4,5-unsaturated L-ASA derivatives showed a better antioxidant activity compared to their saturated counterparts. m-Hydroxyphenyl (7j), p-pentylphenyl (7k) and 2-hydroxyethyl (7q) substituted 4,5-unsaturated 1,2,3-triazole L-ASA derivatives exhibited very efficient and rapid (within 5 min) 2,2-diphenyl-1-picrylhydrazyl (DPPH•) radical scavenging activity (7j, 7k: IC50 = 0.06 mM; 7q: IC50 = 0.07 mM). In vitro scavenging activity data were supported by in silico quantum-chemical modelling. Thermodynamic parameters for hydrogen-atom transfer and electron-transfer radical scavenging pathways of anions deprotonated at C2-OH or C3-OH groups of L-ASA fragments were calculated. The structure activity analysis (SAR) through principal component analysis indicated radical scavenging activity by the participation of OH group with favorable reaction parameters: the C3-OH group of saturated C4-C5(OH) derivatives and the C2-OH group of their unsaturated C4=C5 analogues. The antiproliferative evaluation showed that p-bromophenyl (4e: IC50 = 6.72 μM) and p-pentylphenyl-substituted 1,2,3-triazole L-ASA conjugate (4k: IC50 = 26.91 μM) had a selective cytotoxic effect on breast adenocarcinoma MCF-7 cells. Moreover, compound 4e did not inhibit the growth of foreskin fibroblasts (IC50 > 100 μM). In MCF-7 cells treated with 4e, a significant increase of hydroxylated hypoxia-inducible transcription factor 1 alpha (HIF-1α) expression and decreased expression of nitric oxide synthase 2 (NOS2) were observed, suggesting the involvement of 4e in the HIF-1α signaling pathway for its strong growth-inhibition effect on MCF-7 cells.

scholarly journals Bioassay Guided Isolation of Free Radical Scavenging Agent from the Bark of Bridelia retusa

2015 ◽  
Vol 20 (1) ◽  
pp. 97-101
Author(s):  
Khaga Raj Sharma ◽  
Achyut Adhikari ◽  
M. Iqbal Choudhary ◽  
Suresh Awale ◽  
Surya Kant Kalauni
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Soluble Fraction ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenolic ◽  
Spectroscopic Techniques ◽  
Scavenging Activity ◽  
Bioassay Guided Fractionation ◽  
Bridelia Retusa

Bioassay guided fractionation of ethyl acetate soluble fraction of methanolic extract of Bridelia retusa yielded tambulin (1), beta-sitosterol (2), and beta-sitosterol glucoside (3), and their structures were elucidated using modern spectroscopic techniques. Compounds 1-3 were evaluated for their antioxidant activity and compound 1 was found to be potent antioxidant. The DPPH assay showed that the compound 1 has potent antioxidant activity with IC50 166.15±1.92 SEM [muM] and the radical scavenging activity was found to be 86.03% where as the standard butylated hydroxy toluene (BHT) has IC50 value 128.83±2.1 SEM [muM]. The radical scavenging activity of standard butylated hydroxy toluene was about 86% .The total phenolic content in ethyl acetate soluble fraction was found to be 147.20±1.5 mg GAE/gm and the total flavonoid content was found to be 16.64±0.00 mg QE/gm.Journal of Institute of Science and Technology, 2015, 20(1): 97-101

scholarly journals Inhibition of LDL oxidation by melatonin requires supraphysiologic concentrations

1998 ◽  
Vol 44 (9) ◽  
pp. 1931-1936 ◽  
Author(s):  
P Barton Duell ◽  
David L Wheaton ◽  
Amy Shultz ◽  
Hien Nguyen
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Metal Ion ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Ldl Oxidation ◽  
Human Macrophage ◽  
Published Data ◽  
Scavenging Activity ◽  
Mediated Oxidation

Abstract Melatonin has been suggested as a potent antioxidant that may protect against development of atherosclerosis and cancer; however, these effects are unproven and controversial. The antioxidant capacity of melatonin was tested in comparison with α-tocopherol, ascorbic acid, and the melatonin precursors tryptophan and serotonin, by measuring inhibition of metal ion-mediated and human macrophage-mediated oxidation of LDL. Melatonin had weak antioxidant activity that was detectable only at concentrations 10 000- to 100 000-fold higher than physiologic concentrations. These results were comparable with published data showing that the radical scavenging activity of melatonin requires markedly supraphysiologic concentrations. In contrast, α-tocopherol was 50- to 100-fold more potent and was efficacious at physiologic concentrations. Ascorbic acid and tryptophan also were active at physiologic concentrations and were significantly more potent than melatonin. In summary, extremely supraphysiologic concentrations of melatonin had only weak antioxidant activity, which was surpassed by α-tocopherol, ascorbic acid, and tryptophan.

scholarly journals In vitro assessment of the protection from oxidative stress by various fractions of Artemisia incisa Pamp.

2011 ◽  
Vol 76 (10) ◽  
pp. 1379-1386
Author(s):  
A Aziz-Ur-Rehman ◽  
Sehrish Gulzar ◽  
Muhammad Abbasi ◽  
Tayyaba Shahzadi ◽  
Tauheeda Riaz ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Butylated Hydroxytoluene ◽  
Total Phenolic ◽  
Scavenging Activity ◽  
Aqueous Fraction ◽  
Antioxidant Power ◽  
Ic50 Value

The methanolic extract of Artemisia incisa Pamp. was dissolved in distilled water and successively partitioned with n-hexane, chloroform, ethyl acetate and n-butanol. The antioxidant potential of all these fractions and remaining aqueous fraction was evaluated by four methods, i.e., the scavenging activity of the 1,1-diphenyl-2-picrylhydrazyl radical (DPPH), the total antioxidant activity, the ferric reducing antioxidant power (FRAP) assay and the ferric thiocyanate assay. In addition, the total phenolics was determined. The obtained results revealed that among the studied fractions the ethyl acetate soluble fraction showed the most potent DPPH-radical scavenging activity with an IC50 value of 5.3 ? 0.71 ?g mL-1, which is even more effective than the standard antioxidant butylated hydroxytoluene (BHT) (IC50 value 0f 12.1? 0.92 ?g mL-1). The ethyl acetate fraction also showed the highest FRAP value (3677.13 ? 27.1 ?g TE mL-1), inhibition of lipid peroxidation (60.93 ? 0.84 % at 500 ?g mL-1) and total phenolic content (95.5 ? 0.05 ?g GAE g-1) as compared to other fractions. However, the remaining aqueous fraction was found to posses the highest antioxidant activity of all the fractions.

scholarly journals DEVELOPMENT AND EVALUATION OF HERBAL ANTIAGING CREAM FORMULATION CONTAINING ANNONA SQUAMOSA LEAF EXTRACT

2019 ◽  
pp. 210-214
Author(s):  
VANDANA MAHAWAR ◽  
KALPANA PATIDAR ◽  
NEELAM JOSHI
Keyword(s):  
Ascorbic Acid ◽  
Free Radical ◽  
Leaf Extract ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Phytochemical Analysis ◽  
Scavenging Activity ◽  
Annona Squamosa ◽  
Dpph Method ◽  
Dpph Scavenging

Objective: The aim of this research article is to develop and evaluate herbal antiaging cream using Annona squamosa leaf extract because of its antioxidant potential. Method: Free radical scavenging activity of Annona squamosa aqueous was determined by DPPH method. 0.5 ml of each solution of concentration of sample was added to 3 ml of 0.004% ethanolic DPPH free radical solution. After 30 minutes the absorbance of the preparations were taken at 517 nm by a UV spectrophotometer which was compared with the corresponding absorbance of standard ascorbic acid. The qualitative phytochemical analysis of Annona squamosa (custard apple) leaf extract shows the presence of flavonoids, tannins, alkaloids and phenols and absence of terpenoids and steroids Results: Formulation A3 shows good DPPH scavenging activity as compare to formulation A1 and A2 and ascorbic acid. Formulation A3 is stable for 3 months. Conclusion: Due to high antioxidant values of Annona squamosa it is concluded that it is possible to develop anti-aging cream using aqueous extract of Annona squamosa leaf.

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