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Study on Determination Method of Pectic Substance in Jujube
Author(s): 
Pages: 126-128
Year: Issue:  9
Journal: Acta Agriculturae Jiangxi

Abstract: 介绍了采用咔唑硫酸分光光度法测定红枣中果胶含量.通过实验获得了较佳的测定条件:浓硫酸用量12 mL,水解温度为85~90 ℃,水解时间为20 min,1.5 g/mL咔唑乙醇溶液用量为1 mL,显色温度为25 ℃左右,显色时间为30 min.其相应测定波长为530 nm,平均回收率为98.4%~102.15%,相对标准偏差为0.0432%,测定红枣果胶含量为2.76%.本方法简单准确,显色稳定,灵...
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