橘皮果胶的提取及果胶膜制备工艺参数的优化
2011-09-29武文洁
许 茹,武文洁,南 岳
(天津科技大学材料科学与化学工程学院,天津 300457)
橘皮果胶的提取及果胶膜制备工艺参数的优化
许 茹,武文洁,南 岳
(天津科技大学材料科学与化学工程学院,天津 300457)
采用3种不同的方法从橘皮中提取果胶,探讨果胶膜成膜因素对制备膜性能的影响,研究制备膜的最佳工艺.结果表明:酒石酸酸解盐析法提取果胶效果最好,提取率达10.35%;果胶质量分数、变性淀粉质量分数及助膜剂质量分数均影响制备果胶膜的抗拉强度;影响制备果胶膜抗拉强度的主要因素顺序为助膜剂质量分数>果胶质量分数>变性淀粉质量分数,果胶质量分数2.5%、助膜剂质量分数3.0%、变性淀粉质量分数10.0%为制备膜的最佳工艺条件.
橘皮果胶;提取;果胶膜
Abstract:Pectin was extracted from orange peel by three different methods. The effects of pectin concentration,glycerol concentration and modified starch on the properties of pectin film were investigated and optimal process was studied. The results showed that the total pectin extraction efficiency is 10.35% by the tartaric acid hydrolysis and salting-out method.Finally,the results indicate the effects of glycerol concentration,pectin concentration,and modified starch addition on intensity of tension of the pectin film is significant. The main sequence of the factors affecting tensile strength of pectin film is as follows:glycerol concentration>pectin concentration>modified starch addition. The optimum concentrations of pectin,glycerol and modified starch are 2.5%,3.0% and 10.0%,respectively.
Keywords:pectin from orange peel;extraction;pectin film
果胶是天然的高分子多糖聚合物,是从植物材料中制备的一群复杂胶状多聚体[1].其基本结构为以半乳糖醛酸为单位且由α-1,4-糖苷键连接而成的酸性大分子多糖.柑橘皮中约含20%的果胶,随着我国柑橘栽种面积的逐年增加,柑橘皮来源的广泛,对柑橘皮进行深加工,将提高柑橘的附加值[2–3].
目前,发达国家竞相研制环保生物可降解包装材料及可食性包装材料[4–6].虽然我国在这一领域中有一些研究成果[7–8],但是以果胶为基准物质在可食性和可降解性包装材料中的研究很少.
关于橘皮果胶提取研究的报道有酸解醇析法[9]、酸解盐析法[10]、酶提取法[11]、微波提取法[12]等.本实验以橘皮为原料,采用盐酸酸解醇析法、酒石……
