橘皮残渣中水不溶性膳食纤维提取工艺研究

Extraction process of insoluble dietary fiber from orange peel residue

提取果胶和橙皮苷后残余的橘皮渣是一种极好的水不溶性膳食纤维来源。为了进一步实现对橘皮渣的二次利用,研究了采用化学方法从残余的橘皮渣中提取水不溶性膳食纤维(IDF)的提取工艺,同时对IDF的脱色工艺也进行了研究。结果表明,水不溶性膳食纤维最佳提取工艺条件是:NaOH浓度0.25mol/L、碱浸泡温度50℃、碱浸泡时间1.0h、固液比1∶15。膳食纤维脱色最优参数为:H2O2浓度为4%、脱色温度60℃、脱色时间3h、pH为9。在该条件下,不溶性膳食纤维产率为65.98%,提取率高达92.86%,产品颜色为乳白色。

Orange peel residue after extracting pectin and hesperidin is an excellent source of water insoluble dietary fiber. In order to further implement the secondary use of orange peel residue,the preparation of IDF from the residual slag by chemical methods and its bleaching were studied. The results showed that the optimum condition of IDF extraction was 0.25mol/L of the sodium hydroxide concentration,50% of the extraction temperature,1：15 of the ratio of material and liquid and extracting for 1 hour. The optimum condition of the decoloration of IDF was 4% of H202 concentration,60℃ of the decoloration temperature, pH 9 and decolorizing for 3 hours. Under these conditions,the IDF yield and extraction rate were 65.98% and 92.86%, respectively,for the milky white color.