scholarly journals Increase in the hydroxyl radical-scavenging activity of Panax ginseng and ginsenosides by heat-processing

2018 ◽  
Vol 12 (3) ◽  
pp. 114-121 ◽  
Author(s):  
Chan Hum Park ◽  
Jae Sue Choi ◽  
Takako Yokozawa
Keyword(s):  
Hydroxyl Radical ◽  
Panax Ginseng ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Heat Processing ◽  
Scavenging Activity ◽  
Hydroxyl Radical Scavenging Activity

scholarly journals Seasonal Variability of Juniperus communis L. Berry Ethanol Extracts: 1. In Vitro Hydroxyl Radical Scavenging Activity

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4114
Author(s):  
Jozef Fejér ◽  
Ivan Kron ◽  
Daniela Gruľová ◽  
Adriana Eliašová
Keyword(s):  
Hydroxyl Radical ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Total Phenols ◽  
North East ◽  
Hydroxyl Radical Scavenging Activity ◽  
Novel Method ◽  
Ethanol Extracts

In the present study, in vitro hydroxyl radical scavenging activities, total phenols and terpene contents in 70% ethanol extracts were evaluated. Samples of crushed (CB) and non-crushed ripe juniper berries (NCB) collected at five localities in North-East Slovakia during the years 2012–2014 were compared. Standard or modified methods for determining phytochemical and antioxidant activity were used together with a novel method for the evaluation of the results after the correction of the measured values per gram of dry matter (DM). Statistically significantly higher DM contents (average values for three years) were found in the CB extracts (ranging from 18.86 to 21.91 mg/mL) in comparison to those for NCB (ranging from 2.59 to 9.90 mg/mL). Depending on the localities and years, the hydroxyl radical scavenging activity ranged from 15.52 to 32.85% for NCB and from 65.59 to 88.12% for CB, respectively. The contents of total phenols ranged from 43.75 to 246.75 mg gallic acid equivalents (GAE)/L (NCB) and from 151.84 to 278.19 mg GAE/L (CB), respectively. However, the higher content of total phenols per gram of DM was found in the NCB extracts (8.49–42.23 mg GAE/g DM) and then in CB (6.87–18.77 GAE/g DM). The results obtained in this study showed a higher efficiency for extraction from juniper berries in 70% ethanol if the pericarp was disrupted in comparison to that achieved with the maceration of intact berries.

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