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Thermal degradation of agar: Mechanism and toxicity of products

文献类型： 外文期刊

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

作者机构： 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

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

期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）

ISSN： 0308-8146

年卷期： 2018 年 264 卷

页码：

收录情况： SCI

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.

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