文献类型：期刊文献

英文题名：Thermal degradation of agar: Mechanism and toxicity of products

作者：Ouyang, Qian-Qian[1,3];Hu, Zhang[1];Li, Si-Dong[1];Quan, Wei-Yan[1];Wen, Li-Li[1];Yang, Zi-Ming[2];Li, Pu-Wang[2]

机构：[1]Guangdong Ocean Univ, Sch Chem & Environm Sci, Zhanjiang 524088, Peoples R China;[2]Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Zhanjiang 524001, Peoples R China;[3]Guangdong Ocean Univ, Sch Ocean & Meteorol, Zhanjiang 524088, Peoples R China

年份：2018

卷号：264

起止页码：277

外文期刊名：FOOD CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000433335900035)、、EI(收录号：20182105216553)、Scopus(收录号：2-s2.0-85047005325)、WOS

基金：The authors would like to acknowledge the financial support of the Central Public-Interest Scientific Institution Basal Research Fund for the Chinese Academy of Tropical Agricultural Sciences, China (No. 1630122017011) for this work.

语种：英文

外文关键词：Agar; Gel strength; Thermal degradation; Degradation product; Degradation mechanism

外文摘要：The mechanism of the thermal degradation and the toxicity of the thermal degradation products of agar were studied using TG/DTA, Fourier-transform infrared spectroscopy and pyrolysis gas chromatography/mass spectrometry. It was found that the thermal degradation of agar is a single-step reaction, the thermal degradation temperature (T-0, T-p, T-f) increases with increasing gel strength (P) and the influence of P on the thermal degradation rate is modest. The thermal degradation of agar is an exothermic reaction, and the activation energy of the reaction increases with increasing P. In the thermal degradation, agar is first decomposed into 3,6-anhydropyran galactopyranose and galactopyranose, then 3,6-anhydropyran galactopyranose, and finally furyl hydroxymethyl ketone, through loop opening, dehydration and hydrogen transfer. Galactopyranose follows three degradation pathways, and its final degradation products are 3,4-atrosan, D-allose, furfural and 5-(hydroxymethyl)-2-furancarboxaldehyde. Of the degradation products, furyl hydroxymethyl ketone, furfural, and 5(hydroxymethyl)-2-furancarboxaldehyde show some toxicity to humans.