摘要
设计了简便可行的光度滴定装置；探讨了光度滴定法同时测定酱油中游离酸和游离氨基氮的测定条件。结果表明，此法操作简便、快速，有良好的重现性和精密度。用该法测定酱油中的游离酸和游离氨基氮，取得了回收率分别为９９．４％～１０３％和９７．３％～１０１％、变动系数分别为２．２％～２．８％和０．３９％～１．４％的良好效果。经ｔ检验，用本方法测定酱油中游离酸和游离氨基氮不引起系误差，并且测定结果与我国国家标准方法（ＧＢ－５００９－８５）的测定结果相一致。因此，光度滴定法同时测定酱油中游离酸和游离氨基氮是可行的。
This paper probes into the conditions of simultaneous determination of free acid and freeamino nitrogen in soy sauce with a simple and handleable device for spectrophtometrictitration.The experimental results showed that this method was simple,rapid and of good re-peatability and high precision,The recoveries of free amino nitrogen and free acid were 97.3%～101% and 99.4%～103% respectively,and their coefficients of variation were 0.39%～1.4%and 2.2%～2.8% respectively.The text results were in keeping with those of GB5009.39-85.In short,this method is practical in determination of soy sauce.
出处
《江西农业大学学报》
CAS
CSCD
1996年第1期85-90,共6页
Acta Agriculturae Universitatis Jiangxiensis
关键词
光度滴定法
测定
酱油
游离酸
游离氨基氮
spectrophotometric titration
determination
free acid
free amino nitrogen
