离子选择性电极法测定卡拉胶中钾含量  

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

作　　者：张立新[1] 唐美君 薛峰[1] 范晓[3] 赵夕龙[1] 刘秀[1] 

机构地区：[1]青岛大学化学化工与环境学院,山东青岛266071 [2]兖矿集团第二医院小儿科,山东济宁273500 [3]中科院海洋研究所,山东青岛266071

出　　处：《食品科学》2008年第12期525-527,共3页Food Science

基　　金：山东省教育厅项目(J04B14);山东省科技攻关项目(2004G2205117)

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%。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%.

关 键 词：卡拉胶 钾含量 钾离子选择电极 四苯硼钠滴定法 

分 类 号：R284.1[医药卫生—中药学]