食品科学 ›› 2008, Vol. 29 ›› Issue (12): 525-527.

• 分析检测 • 上一篇    下一篇

离子选择性电极法测定卡拉胶中钾含量

 张立新, 唐美君, 薛峰, 范晓, 赵夕龙, 刘秀   

  1. 青岛大学化学化工与环境学院; 兖矿集团第二医院小儿科; 中科院海洋研究所;
  • 出版日期:2008-12-15 发布日期:2011-12-08

Determination of Potassium Content in Carrageenan Using Potassium Ion Selective Electrode Method

 ZHANG  Li-Xin, TANG  Mei-Jun, XUE  Feng, FAN  Xiao, ZHAO  Xi-Long, LIU  Xiu   

  1. 1.College of Chemistry,Chemical Engineering and Environmental,Qingdao University,Qingdao 266071,China; 2.Pediatrics,Second Hospital of Yanzhou Mineral Corporation,Jining 273500,China; 3.Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China
  • Online:2008-12-15 Published:2011-12-08

摘要: 卡拉胶中钾离子的含量会影响卡拉胶的凝固性,为测定卡拉胶中钾的含量,本实验将商品卡拉胶用盐酸-硝酸(1:3)湿法处理后,配成一定浓度的溶液,用四苯硼钠滴定法做对照,采用钾离子选择性电极法对卡拉胶中的钾含量进行了测定,建立了一种简便、快速、准确的测定卡拉胶中钾含量的方法,标准曲线方程:y=48.14x+175.45,相关系数为0.9942。用此方法测得卡拉胶样品中的钾含量为5.36%,相对标准偏差(RSD)为0.65%。

关键词: 卡拉胶, 钾含量, 钾离子选择电极, 四苯硼钠滴定法

Abstract: The gelling characteristics of carrageenan are closely connected with its potassium content. To determine the potassium content in carrageenan,the solution of potassium from carrageenan sample was prepared using wet treating method with HCl-HNO3(1:3) and determined with potassium ion selective electrode method,employing the results of sodium tetraphenylborate titration method as control. A quick,simple and accurate method was established. The standard curve is:y=48.14x+175.45 with the correlation coefficient 0.9942. It was found experimentally that the potassium content in one carrageenan sample is 5.36% with the RSD 0.65%.

Key words: carrageenan, potassium content, potassium ion selective electrode, sodium tetraphenylborate titration