Screening of Free Radical Scavenging Compounds in Water Extracts ofMenthaSamples Using a Postcolumn Derivatization Method

2004 ◽  
Vol 52 (16) ◽  
pp. 5004-5010 ◽  
Author(s):  
Müberra Koşar ◽  
H. J. Damien Dorman ◽  
K. Hüsnü Can Başer ◽  
Raimo Hiltunen
Keyword(s):  
Free Radical ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Water Extracts ◽  
Radical Scavenging Compounds ◽  
Postcolumn Derivatization

scholarly journals PHYTOCHEMICAL SCREENING AND IN VITRO ANTIOXIDANT ACTIVITIES OF LEAF EXTRACTS OF ALTERNANTHERA BRASILIANA (L). KUNTZE AND ALTERNANTHERA BETTZICKIANA REGEL.

2018 ◽  
Vol 11 (6) ◽  
pp. 266
Author(s):  
Kasthuri O R ◽  
Ramesh B
Keyword(s):  
Free Radical ◽  
Secondary Metabolites ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Phytochemical Screening ◽  
Leaf Extracts ◽  
Water Extracts ◽  
Hydroethanolic Extract

Objectives: The present study was carried out to determine the phytochemical constituents and in vitro antioxidant activities of leaf extracts of Alternanthera brasiliana (L). Kuntze (A. brasiliana) and Alternanthera bettzickiana regel (A. bettzickiana).Methods: Preliminary phytochemical screening was performed in petroleum ether, chloroform, acetone, ethanol, hydroethanolic and water extracts of leaves of A. brasiliana and A. bettzickiana. The level of alkaloids, flavonoids, total phenolic content, tannins, Vitamin C, Vitamin E, GSH, and total proteins were determined in hydroethanolic, ethanol, and water extracts. Antioxidant activity of the hydroethanolic leaf extracts of A. brasiliana and A. bettzickiana were determined by 2,2-diphenyl-1-picryl-hydrazyl-hydrate free radical scavenging assay, nitric oxide scavenging assay, superoxide anion scavenging assay, ferric reducing antioxidant power assay, total antioxidant capacity, and reducing power assay.Results: The phytochemical screening of six different extracts of A. brasiliana and A. bettzickiana revealed the presence of various phytonutrients. Quantitative analysis of secondary metabolites in ethanol, hydroethanolic and water extracts of leaves of A. brasiliana and A. bettzickiana showed the presence of high amount of secondary metabolites in the hydroethanolic extract. In vitro, antioxidant assay of two plant extracts revealed that A. bettzickiana was more potent than A. brasiliana in scavenging free radicals.Conclusion: The different extracts from A. brasiliana and A. bettzickiana and specifically the hydroethanolic extract of A. bettzickiana revealed several properties such as rich source of phytonutrients, higher free radical scavenging properties, and significant antioxidant capabilities. Therefore, the bioactive compound should be isolated in future studies and could be used as a safe and serve as a potential source of natural antioxidants.

Free radical-scavenging phytochemicals of hot water extracts of Acacia confusa leaves detected by an on-line screening method

2009 ◽  
Vol 115 (3) ◽  
pp. 1019-1024 ◽  
Author(s):  
Yu-Tang Tung ◽  
Jyh-Horng Wu ◽  
Ching-Yu Hsieh ◽  
Ping-Sheng Chen ◽  
Shang-Tzen Chang
Keyword(s):  
Free Radical ◽  
Screening Method ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Hot Water ◽  
Water Extracts ◽  
Acacia Confusa ◽  
On Line

Antioxidative and Antimutagenic Activities of Healthy Herbal Drinks from Chinese Medicinal Herbs

2003 ◽  
Vol 31 (04) ◽  
pp. 523-532 ◽  
Author(s):  
Wenlung Chen ◽  
Yih-Ming Weng ◽  
Chin-Yin Tseng
Keyword(s):  
Free Radical ◽  
Pilot Plant ◽  
Mutagenic Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Medicinal Herbs ◽  
Chinese Medicinal Herbs ◽  
Water Extracts ◽  
Pilot Plant Scale

Twenty-nine Chinese medicinal herbs and three healthy herbal drinks made of those herbs in a food processing pilot plant were tested for their antioxidative, free radical scavenging, mutagenic and antimutagenic activities. Water extracts of herbs (with few exceptions) and herbal drinks showed free radical scavenging activity. All water extracts of herbs and herbal drinks showed no mutagenicity toward Salmonella typhimurium tester strains TA98 and TA100 used in the Ames mutagenic tests. In the antimutagenic tests, the mutagenic activity of 4-nitroquinoline N-oxide (NQNO) toward S. typhimurium TA98 was markedly inhibited by water extracts of herbs and herbal drinks. Based on the results, it is suggested that the herbal drinks manufactured in pilot-plant scale are safe and can be served as health-promoting drinks for the public.

scholarly journals Screening of Antioxidant Activity of 20 Kinds of Mushrooms from Southwest of China

2021 ◽  
pp. 26-32
Author(s):  
Dong-Hao He ◽  
Zhao-Hui Yu ◽  
Yi Huang
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Total Phenolic ◽  
Water Extracts ◽  
Serpula Lacrymans ◽  
Daldinia Concentrica

The ethanol and water extracts of 20 kinds of mushrooms from Sichuan Province, Southwest of China, were investigated for their antioxidant activity using DPPH assay. The results showed the ethanol extract of Serpula lacrymans, Daldinia concentrica, and Scleroderma verrucosum had well DPPH free radical scavenging activities 91.33%, 79.76% and 62.82%, respectively. Besides, the water extracts of Serpula lacrymans, Armillaria luteo-virens, and Lentinus edodes also possessed pretty high DPPH free radical scavenging activity were 95.59%, 88.76% and 86.93%, respectively. Based on the above comparison, the EC50 and total phenolic content of the ethanol extracts of Serpula lacrymans, Daldinia concentrica, and Scleroderma verrucosum were also measured. Their EC50 and total phenolic content valued of 17.87mg·mL-1, 11.19mg·mL-1 and 35.01mg·mL-1, as well as 0.0769μg·L-1, 0.0673μg·L-1 and 0.0545μg·L-1, respectively. The results showed there was a correlation between antioxidant activity and total phenolic content. Besides, the reaction time of the DPPH test affected the free radical scavenging, which reflected the difference of the extract component would impact the test method.

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