Laboratory study on the inhibitory effect of free radical scavenger on coal spontaneous combustion

2018 ◽  
Vol 171 ◽  
pp. 350-360 ◽  
Author(s):  
Jinhu Li ◽  
Zenghua Li ◽  
Yongliang Yang ◽  
Biao Kong ◽  
Chaojie Wang
Keyword(s):  
Free Radical ◽  
Laboratory Study ◽  
Spontaneous Combustion ◽  
Inhibitory Effect ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Coal Spontaneous Combustion

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.

scholarly journals Possible Protective Role of Melatonin in Pediatric Infectious Diseases and Neurodevelopmental Pathologies

2020 ◽  
Vol 10 (01) ◽  
pp. e104-e109
Author(s):  
Antonio Molina-Carballo ◽  
Antonio Emilio Jerez-Calero ◽  
Antonio Muñoz-Hoyos
Keyword(s):  
Endothelial Cell ◽  
Free Radical ◽  
Chronic Administration ◽  
Protective Role ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Energetic Metabolism ◽  
Beneficial Effects ◽  
Molecular Crosstalk

AbstractMelatonin, produced in every cell that possesses mitochondria, acts as an endogenous free radical scavenger, and improves energetic metabolism and immune function, by complex molecular crosstalk with other intracellular compounds. There is greatly increasing evidence regarding beneficial effects of acute and chronic administration of high melatonin doses, in infectious, developmental, and degenerative pathologies, as an endothelial cell and every cell protectant.

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