食品科学 ›› 2009, Vol. 30 ›› Issue (6): 216-218.doi: 10.7506/spkx1002-6630-200906049

• 分析检测 • 上一篇    下一篇

双波长分光光度法测定食品中的钙

王玉宝,陈玉静* ,候法菊   

  1. 鲁东大学化学与材料科学学院
  • 收稿日期:2008-04-25 修回日期:2008-07-28 出版日期:2009-03-15 发布日期:2010-12-29
  • 通讯作者: 陈玉静 E-mail:rabbit197968@sina.com
  • 基金资助:

    鲁东大学科研基金项目(L20082901)

Dual-wavelength Spectrophotometric Determination of Calcium in Food

WANG Yu-bao,CHEN Yu-jing*,HOU Fa-ju   

  1. (College of Chemistry and Materials Science, Ludong University, Yantai 264025, China)
  • Received:2008-04-25 Revised:2008-07-28 Online:2009-03-15 Published:2010-12-29
  • Contact: CHEN Yu-jing*, E-mail:rabbit197968@sina.com

摘要:

本实验研究偶氮胂I 与钙的显色反应,在平平加存在下,pH9.5 的NH3-NH4Cl 缓冲体系中,钙与偶氮胂Ⅰ形成稳定的紫色络合物,以480nm 为参比波长,570nm 为测定波长,建立了双峰双波长分光光度法测定钙含量的新方法。结果表明:本法较单波长光度法有较高的灵敏度,表观摩尔吸光系数为6.16 × 104L/mol·cm,钙含量在0~1.3μg/ml 范围内符合比尔定律。该方法用于食品中钙的测定,结果满意。

关键词: 双波长分光光度法, 偶氮胂Ⅰ,

Abstract:

In the presence of peregal, calcium reacts with arsenazo Ⅰ to form a stable purple complex in NH3-NH4Cl buffer solution (pH 9.5), and then with the measuring and reference wavelengths of 570 nm and 480 nm respectively, a new dual-wavelength dual-peak spectrophotometric method for the determination of calcium content was developed in this study. The results showed that the dual-wavelength spectrophotometer is more sensitive than the single-wavelength spectrophotometer, ε0 = 6.16×104 L/mol·cm, and the calcium content accords with Bill’s law in the range of 0 to1.3 μg/ml. The method was applied in the etermination of calcium in milk powder and glucose samples. The obtained results are satisfying.

Key words: dual-wavelength spectrophotometry, rsenazo Ⅰ, calcium

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