食品科学 ›› 2011, Vol. 32 ›› Issue (16): 209-212.doi: 10.7506/spkx1002-6630-201116044

• 分析检测 • 上一篇    下一篇

番红花红O修饰铅笔芯电极测定水果酸度

罗济文,陈宪明,韦庆敏,庞 起,姚燕春   

  1. 玉林师范学院化学与生物系
  • 出版日期:2011-08-25 发布日期:2011-07-26
  • 基金资助:
    国家自然科学基金地区项目(20863008);广西教育厅科研基金资助项目(200708LX164)

Safranine O Modified Pencil Graphite Electrode and Its Application for Determination of Fruit Acidity

LUO Ji-wen,CHEN Xian-ming,WEI Qing-min,PANG Qi,YAO Yan-chun   

  1. (Department of Chemistry and Biology, Yulin Normal University, Yulin 537000, China)
  • Online:2011-08-25 Published:2011-07-26

摘要: 在含番红花红O的磷酸盐缓冲溶液(phosphate buffered salines,PBS)中,采用循环伏安法在预处理过的铅笔芯电极表面生成聚番红花红O薄膜,考察溶液的pH值、扫描电位范围对修饰过程的影响。在-1.0~0.0V(vs SCE)的扫描电位范围和酸性介质中形成的薄膜,在空白PBS中具有较高电活性和稳定性,并且在pH1.5~7.5之间,阳极伏安峰电位与pH值有良好的线性关系。利用这种关系测定橙子和西红柿活体及果汁的酸度取得满意结果。

关键词: 番红花红O, 铅笔芯, 水果, 酸度测定

Abstract: A safranine O (SO) polymer film was formed by cyclic voltammetry on the surface of a pretreated pencil electrode (PGE) in SO-containing phosphate buffered saline (PBS). The effects of buffer pH and potential scan range on the modification process were investigated. The polymer film formed in an acidic solution (pH 6.01) and a potential scan range between-1.0 V and 0.0 V (vs SCE) showed high electrochemical activity and good stability in blank PBS solutions, and a good linearity between the voltammetric peak potential and the buffer pH was obtained in the pH range of 1.5-7.5. This modified electrode could be used for determining the acidity of oranges, tomatoes and juice with satisfying results.

Key words: safranine O, pencil graphite, fruit, acidity determination

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