橘皮中果胶提取工艺的优化及其理化性质测定

摘要

The acid extraction technique of pectin from orange peel was optimized, the effect of different decolorizers on pectin decolorization was studied and the physicochemical property of pectin from orange peel was determined to develop and utilize pectin from orange peel in production. The results show that the optimal acid extraction technique includes 1: 1.5 solid-liquid ratio, pH 1.5 and 95C for 120min and the pectin yield could be up to 12.66％ under the optimal acid extraction technique. The recovery rate of pectin after decolorization reaches 93.1％ by using AB-8 macroporous absorbent resin as a decolorizer.The pH, ash content, esterification degree and galacturomic acid content of pectin with light yellow powder, no peculiar odor and water-solubility were 2. 94, 4. 52％, 71. 63％ and 76. 05％ respectively,which accords with the standard of QB2484-2000.%为使橘皮果胶能在生产上得到广泛应用,采用酸萃取法对提取橘皮中果胶的工艺条件进行了优化,考察了优化后的果胶脱色工艺,并对提取果胶的理化性质进行了测定.结果表明:酸萃取法提取橘皮果胶的适宜工艺为以pH 1.5的水、料液比1:15(g:mL),于95℃浸提120 min,果胶得率为12.66%;AB-8型大孔吸附树脂的脱色效果较好,脱色后果胶回收率达93.1%;果胶外观呈淡米黄色粉末,无异味,溶于20倍水呈粘稠状液体,pH 2.94,灰分4.52%,酯化度为71.63%,半乳糖醛酸含量为76.05%,均符合QB2484-2000标准.