【摘要】 用钙离子螯合剂六偏磷酸钠(SHMP)溶液从甜菜干粕中提取果胶,并对提取工艺进行优化。在单因素试验的基础之上,对影响果胶得率的主要因素进行Box-Benhnken中心组合实验设计;建立六偏磷酸钠提取甜菜果胶的二次回归模型。实验结果表明,甜菜果胶的最佳提取工艺为提取时间2.4h,螯合剂SHMP质量分数1.25%,提取温度88℃,此时果胶产率为14.32%,与模型预测值接近。同时,采用间羟联苯法测定出果胶样品的半乳糖醛酸含量为73.12%。红外光谱的数据表明,果胶样品具有果胶分子的结构特征,并初步判断为低酯果胶。更多还原

【Abstract】 Pectin was isolated with sodium hexametaphosphate(SHMP) solution from sugar beet pulp. Extraction conditions affecting the yield of pectin were optimized by Box- Benhnken experimental design on the basis of single-factor tests. The results showed that the optimum extraction conditions of pectin from sugar beet pulp were as follows: extraction time 2.4h, mass fraction of SHMP1.25% and extraction temperature 88℃. Under these conditions, the experimental extraction yield of sugar beet pectin was 14.32%, which was very close to the predicted one. The total galacturonic acid content determined by meta- hydroxyldiphenyl was 73.12%. FT- IR results indicated that sugar beet pectin had molecular structure of pectin and the primary test showed it had a low degree of esterification.更多还原