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Degradation kinetics of some phenolic compounds in subcritical water and radical scavenging activity of their degradation products
Author(s) -
Khuwijitjaru Pramote,
Plernjit Jiraporn,
Suaylam Boonyanuch,
Samuhaseneetoo Suched,
Pongsawatmanit Rungnaphar,
Adachi Shuji
Publication year - 2014
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21898
Subject(s) - caffeic acid , chemistry , syringic acid , gallic acid , scavenging , phenolic acid , chlorogenic acid , protocatechuic acid , dpph , degradation (telecommunications) , vanillic acid , phenols , catechin , organic chemistry , kinetics , ferulic acid , nuclear chemistry , rutin , chromatography , antioxidant , polyphenol , telecommunications , physics , quantum mechanics , computer science
The degradation of 10 phenolic compounds including 9 phenolic acids (caffeic, chlorogenic, p ‐coumaric, gallic, gentisic, p ‐hydroxybenzoic, protocatechuic, syringic and vanillic acids) and one flavanol (catechin) in subcritical water at the initial concentration of 100 mg/L was investigated in a temperature range of 100–250°C for 30–120 min in a batch‐type vessel. The degradation process followed the first‐order kinetics model. After treatment at 250°C for 30 min, all the compounds completely disappeared. We also demonstrated that the subcritical water treatment of some phenolic compounds, especially, caffeic acid, resulted in products that were quite stable at high temperature and exhibited a high DPPH radical scavenging activity, that is retaining about 50% of the DPPH radical scavenging activity compared to the original caffeic acid solution after the treatment at 250°C for 120 min.