热处理过程中β-胡萝卜素的副产物分析

Analysis of β-Carotene Byproducts during Thermal Processing

应用凝胶渗透色谱等分析手段检测后发现:β-胡萝卜素熔融后只产生极少量副产物;40℃加热氯仿溶液一周会生成了从小分子化合物到聚合物的一系列物质;固态40℃加热1w后β-胡萝卜素的聚合反应和氧化反应都非常剧烈,生成了标定分子量从431到11511的副产物基本不发生降解。同时对不同条件下β-胡萝卜素样品的副产物类型和结构作了分析,并推测聚合反应可能是最主要的副反应途径。本方法有助于人们更全面地认识β-胡萝卜素在热处理过程中的变化规律。

It was found that only fewer isomerizations take place during the melting of β -carotene. When heating β -carotene solution at 40 ℃ for one week, products with molecular weight （MW） from 251 to 5283 are created, and when solid β -carotene was heated at 40℃ for one week, products with MW from 431 to 11511 are produced by serious oxidation and polymerization. In a sense polymerization might be dominant path of β-carotene producing byproducts during thermal processing according to analysis of functional groups of the byproducts, while the mechanism should be researched further.