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酱油中氨基酸态氮、总酸的检验

2014-09-11 16:38:50| 分类：食品检验 | 标签： |举报 |字号大中小订阅

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酱油中氨基酸态氮、总酸的检验

1、取5.0毫升酱油，定容100毫升。

2、吸取20.0毫升稀释样，于200毫升烧杯中，加水60毫升，开动磁力搅拌器。

3、用0.05摩尔浓度的氢氧化钠标准溶液滴定，到PH为8.2，加10毫升甲醛。继续滴定，到PH为9.2，记下从8.2到9.2所用的滴定液用量V，同时做空白V0。

4、计算：X=（V-V0）×C×0.014÷(V样稀液×5÷100) ×100

5、总酸，是将滴定到8.2时，耗用的氢氧化钠体积推算，将0.014换成0.090.

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