食品科学 ›› 2007, Vol. 28 ›› Issue (3): 305-308.

• 分析检测 • 上一篇    下一篇

离子选择性电极浓度直读法快速测定火棘果中的微量钙

 高向阳, 朱玲, 孙灵霞   

  1. 河南农业大学食品科学技术学院; 河南农业大学食品科学技术学院 河南郑州450002; 河南郑州450002;
  • 出版日期:2007-03-15 发布日期:2011-12-31

Determination of Micro-calcium in Pyracantha fortuneana Fruit by Direct-reading Method of Ca Ion Selective Electrode

 GAO  Xiang-Yang, ZHU  Ling, SUN  Ling-Xia   

  1. College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, China
  • Online:2007-03-15 Published:2011-12-31

摘要: 目的:为火棘果中钙含量的测定提供一种准确、快速、简便、直观的测定方法,并为火棘果功能性成分的开发提供科学依据。方法:用干法灰化处理样品,用钙离子选择性电极浓度直读法快速测定了火棘果中的钙,实验对离子强度调节剂和掩蔽剂的用量,缓冲剂的用量以及最佳适用pH范围、方法回收率、精密度、检出限及线性范围作了探讨。结果:实验结果表明:方法的线性范围为0.731~4017mg/L,检出限为1.21×10-2mg/L,回收率为92.36%~108.50%,方法的RSD%为1.6%(n=6)。结论:该法用于火棘果中钙的测定快速、简便、成本低廉,结果令人满意。

关键词: 离子选择性电极, 浓度直读, 钙, 火棘果

Abstract: Purposes: To provide a kind of accurate, fast, simple, and direct reading method for calcium content in Pyracantha fortuneana fruit, for its functional compositions in scientific study. Methods: To measure the calcium content in Pyracantha fortuneana fruit by calcium-selective electrode—direct reading concentration method. The experiment studied the TISAB (total ionic strength adjustment buffer), the optimal scope of pH and the recovery, precision, and detection limit of this method. Results: The linear range is 0.731~4017mg/L, the detection limit 1.21×10-2mg/L, the recovery is 92.36%~108.50%, and the RSD% is 1.6%(n=6). Conclusions: This method is fast and simple for the determination of the calcium in Pyracantha fortuneana fruit. The cost is low and the result is satisfatory.

Key words: ion-selective electrode, direct-reading method, calcium, Pyracantha fortuneana fruit