吉林大学学报(医学版)

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自动电位滴定法和高效液相色谱法测定深颜色果蔬中维生素C浓度的比较

甘振威1, 武广恒2,刘国良1,张娅婕1,徐坤1,谢林1,甘露*   

  1. 1.吉林大学公共卫生学院预防医学实验教学中心,吉林 长春 130021;2. 吉林大学基础医学院生物化学与分子生物学实验中心,吉林 长春 130021
  • 收稿日期:2013-07-29 出版日期:2014-03-28 发布日期:2014-05-28
  • 通讯作者: 谢 林(Tel: 0431-85619455,E-mail:xielin@jlu.edu.cn) E-mail:xielin@jlu.edu.cn
  • 作者简介:甘振威(1966-),男,吉林省农安县人,高级工程师,公共卫生学硕士,主要从事食品与营养方面的研究。
  • 基金资助:

    国家自然科学基金资助课题(81102115);吉林大学2011年实验技术项目资助课题(2011)

Comparison of vitamin C concentrations  in dark colour fruits and vegetables detected by automatic potentiometric titration and HPLC method

GAN Zhen-wei1,WU Guang-heng2,LIU Guo-liang1,ZHANG Ya-jie1,XU Kun1, XIE Lin1,GAN Lu*   

  1. 1. Experimental Teaching Center of Preventive Medicine,School of Public Health,Jilin University,Changchun 130021, China;2.Experimental Center of Biochemistry and Molecular Biology,School of Basic Medical Sciences, Jilin University, Changchun 130021,China
  • Received:2013-07-29 Online:2014-03-28 Published:2014-05-28

摘要:

目的:探讨应用自动电位滴定法和高效液相色谱(HPLC)法定量测定深颜色果蔬中维生素C(Vc)浓度的可行性,为少量或批量果蔬样品Vc浓度的测定提供方法依据。方法:选取市售的15种蔬菜和15种水果的可食部分,加入一定量的草酸做Vc保护剂进行匀浆、过滤、离心处理,取一定量的上清液分别对其中的Vc浓度进行自动电位滴定和HPLC分析,对于同一红柿椒样品,分别用2种分析法对样品的Vc浓度进行准确度和精确度的测定。结果:2种分析法检测30种果蔬中Vc的浓度差异无统计学意义(P>0.05),电位法对红柿椒中Vc浓度测定的回收率为98.34%~103.98%,HPLC法对Vc浓度测定的回收率为99.66%~101.49%;电位法测定红柿椒中Vc的相对标准偏差(RSD)为1.77%~2.88%,HPLC法测定Vc的RSD为0.15%~0.32%,且HPLC法线性关系良好(R2=0.999 9)。结论:2种分析法对深颜色果蔬样品中Vc浓度测定的准确度和精密度均能满足定量分析的要求,均为较理想的测试方法。

关键词: 电位滴定, 色谱法, 高效液相, 维生素C, 果蔬, 准确度, 精确度

Abstract:

Objective  To explore the feasibility of quantitatively measuring the concentrations of vitamin  C (Vc) in         dark colour fruits and vegetables detected by  automatic potentiometric titration and high performance liquid chromatography (HPLC), and to provide experimental basis  for measurement  of Vc concentrations in  a few or amount of fruits and vegetables.Methods 15 kinds of fruits and 15 kinds of vegetables sold in supermarket were selected.After adding a small quantity of oxalic acid,these samples were crisped,filtered, and centrifuged sequentially,and then the concentrations of Vc in upper clean liquid were determined by automatic potentiometric titration and HPLC method.Accuracy and precision  test  for  the same sample were also done with two methods.Results There were no significant  differences between the detection results of Vc  concentrations detected   by  two  methods  (P>0.05), and the recovery  rates in red pepper detected with automatic potentiometric titration and HPLC methods were 98.34%-103.98%  and  99.66%-101.49%,respectively; the relative standard deviation (RSD)  were 1.77% -2.88%  and  0.15%-0.32%,respectively. The HPLC data had good linear relationship (R2 =0.999 9). Conclusion The two kinds of  test  methods are  ideal  methods for the determination of  Vc concentrations in dark colour  fruits and vegetables.They both have good accuracy and precision for the requirement of quantity analysis.

Key words: potentiometric titration;chromatography,high performance liquid, vitamin C, dark colour fruits and vegetables, accuracy, precision

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