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酱油中铵盐的检验

2014-09-11 17:17:03| 分类：食品检验 | 标签： |举报 |字号大中小订阅

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酱油中铵盐的检验

1、于250毫升三角瓶中，加入10毫升（20克/L）硼酸溶液，加入甲基红-溴甲酚绿混合指示剂2-3滴。

2、吸取酱油2毫升，加水150毫升，加1克氧化镁，蒸馏30分钟。

3、用0.1摩尔浓度的盐酸标准溶液滴定，至出现紫红色，计数V，同时做空白V0.

4、计算：X=（V-V0）×C×0.014÷2

5、酱油中铵盐（以氮计）的含量，不得超过氨基酸态氮含量的30%

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