Inhibitory effect of free radical scavenger, MCI-186, in the increase of hydroxyl radical induced by iminodipropionitrile in rats

2004 ◽  
Vol 219 (1-2) ◽  
pp. 41-44 ◽  
Author(s):  
Nobuatsu Nomoto
Keyword(s):  
Free Radical ◽  
Hydroxyl Radical ◽  
Inhibitory Effect ◽  
Free Radical Scavenger ◽  
Radical Scavenger

Study on Antioxidant Activity of Dihydromyricetin-Zinc(II) Complex

2011 ◽  
Vol 183-185 ◽  
pp. 863-867 ◽  
Author(s):  
Chun Wu ◽  
Xin Ping Zheng ◽  
Lin Lin Chen
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Hydroxyl Radical ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Free Radical Scavenger ◽  
Superoxide Anion Radical ◽  
Radical Scavenger ◽  
Scavenging Activity ◽  
Dpph Radical

Dihydromyricetin-zinc(II) complex was synthesized. The scavenging activity of DPPH radical, hydroxyl radical, superoxide anion radical and alkane radical by dihydromyricetin-zinc(II) complex were determine, moreover compared with Vc. The results showed that dihydromyricetin-zinc(II) complex possessed strong scavenging activities on DPPH•, hydroxyl radical, superoxide anion radical and alkane radical with correspounding maximum scavenging rate 74%, 70% , 65% and 50% at the concentration from 0.1 mmol/L to 0.5 mmol/L, respectively, which were higher than Vc. These results suggested that dihydromyricetin-zinc(II) complex would be an effective free radical scavenger.

Control of Sonoluminescence in Carbon Dioxide Containing Di Water at near Neutral pH Conditions

2012 ◽  
Vol 187 ◽  
pp. 177-180 ◽  
Author(s):  
Sangita Kumari ◽  
Manish Keswani ◽  
Satish Kumar Singh ◽  
Mark Beck ◽  
Eric Liebscher ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Free Radical ◽  
Light Emission ◽  
Radical Scavenging ◽  
Inhibitory Effect ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Chemical Systems ◽  
Ph Conditions ◽  
Radical Scavenging Ability

Light emission in sound-irradiated liquids, known as Sonoluminescence (SL), is associated with the phenomenon of cavitation that affects wafer damage during megasonic processing of wafers. It has been shown that the intensity of SL can be substantially decreased through the dissolution of carbon dioxide in deionized water. However, such dissolution decreases the pH to roughly 4.0, which is not very desirable for the removal of contaminant particles. This paper reports two chemical systems that are capable of taking advantage of the effect of CO2 while allowing the use of slightly higher pH values. Specifically, NH4OH/CO2 and NH4HCO3/dilute HCl systems have been shown to be capable of well controlled reduction in SL at pH 5.7 or 7.0. In order to test whether the free radical scavenging ability of CO2 may be responsible for its strong SL-inhibitory effect, the effect of a well known free radical scavenger, dimethyl sulfoxide (DMSO), on SL produced in DI water has been investigated.

OPTIMASI KONDISI EKSTRAKSI SENYAWA AKTIF ANTIOKSIDAN DARI BIJI ANGGUR

2019 ◽  
Vol 3 (2) ◽  
pp. 35
Author(s):  
Kartini Kartini ◽  
Azminah Azminah
Keyword(s):  
Free Radical ◽  
Optimum Condition ◽  
Active Compound ◽  
Grape Seed ◽  
Free Radical Scavenger ◽  
Water Bath ◽  
Radical Scavenger ◽  
Optimum Conditions ◽  
Ethanolic Solution ◽  
Reduced Pressure

In order to prepare standardized extract, optimization of extraction conditions of grape seed has been done. These conditions are type of menstrum (50, 70 and 96% of ethanolic solution), length of extraction (1, 2 and 4 hours) also method of evaporation (reduced pressure and opened air). Activity on free radical scavenger used as parameters to determine optimum conditions. Based on EC50 (concentration which scavenge 50% amount of free radical) can be concluded that optimum condition for extracting antioxidant active compound from grape seed are 70% ethanolic solution as menstrum, length of extraction 1 hour and evaporation on opened air use water bath.

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