食品科学

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离子电极法快速测定榨菜中硝酸盐含量

孙钟雷,许 艺,李 宇*,赵李玉   

  1. 长江师范学院生命科学与技术学院,重庆 408100
  • 出版日期:2016-07-25 发布日期:2016-07-26
  • 通讯作者: 李 宇
  • 基金资助:

    重庆市教委科学技术研究项目(KJ1401203);长江师范学院校级科研项目(2013XJZD001);
    榨菜种植与深加工创新团队项目(KJTD201322)

Rapid Determination of Nitrate Content in Pickled Mustard Tuber by Ion-Selective Electrode Method

SUN Zhonglei, XU Yi, LI Yu, ZHAO Liyu   

  1. Institute of Life Science and Technology, Yangtze Normal University, Chongqing 408100, China
  • Online:2016-07-25 Published:2016-07-26
  • Contact: LI Yu

摘要:

建立一种采用离子电极快速测定榨菜中硝酸盐含量的方法。首先组建由硝酸根离子选择电极、参比电极、离子计和计算机构成的测试仪器,然后分析温度、离子强度调节剂及干扰离子对测试的影响,并建立标准曲线和校准方程,最后采用离子电极法测定榨菜成品液和榨菜脱盐液中的硝酸盐含量,并与紫外分光光度法进行比较。结果表明:温度、离子强度调节剂及干扰离子对榨菜中硝酸盐含量的测试影响较小;离子电极法测定结果与紫外分光光度法测定结果的总体平均相对误差为4.247%,相对标准偏差小于2.0%,且t检验的显著性水平大于0.05,2 种方法测试结果无明显差异,并且离子电极法测试时间小于15 s。本方法可代替紫外分光光度法作为榨菜中硝酸盐含量的快速测定方法。

关键词: 榨菜, 硝酸盐, 离子电极法, 快速检测

Abstract:

An ion-selective electrode (ISE) method was developed for the rapid determination of nitrate in pickled mustard
tuber. Firstly, a test instrument consisting of nitrate ion-selective electrodes, reference electrode, ion meter, and computer
was assembled. Then the calibration curve was developed and the influence of temperature, ionic strength and interfering
ions on the ISE method was analyzed. Lastly, the nitrate content in pickled mustard tuber was determined by the ISE
method, and the data obtained were compared with those from conventional ultraviolet spectrophotometry. The results
showed that the temperature change did not affect the calibration curve. Addition of ionic strength regulator and the presence
of interfering ions had less influence on the standard curve. The average error between the ion-selective electrode method
and ultraviolet spectrophotometry was 4.247%, and their relative standard deviations were less than 2.0%. There were
no significant differences between the two methods by t-test. The ion-selective electrode method can be an alternative to
ultraviolet spectrophotometry for the rapid determination of nitrate content in pickled mustard tuber within 15 seconds.

Key words: pickled mustard tuber, nitrate, ion-selective electrode method, rapid detection

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