食品科学 ›› 2011, Vol. 32 ›› Issue (6 ): 311-313.doi: 10.7506/spkx1002-6630-201106071

• 技术应用 • 上一篇    下一篇

纳米氧化铁修饰电位型抗坏血酸传感器的研制

刘 芳1,郭志慧2,郑行望2   

  1. 1.文山学院生化系 2.陕西师范大学化学与材料科学学院
  • 收稿日期:2010-05-27 修回日期:2011-01-21 出版日期:2011-03-25 发布日期:2011-03-03
  • 通讯作者: 刘芳 E-mail:lflyd7125315@126.com

Development of Nano-Fe2O3-modified Potentiometric Sensor for Ascorbic Acid

LIU Fang1,GUO Zhi-hui2,ZHENG Xing-wang2   

  1. 1. Department of Bio-chemistry, Wenshan University, Wenshan 663000, China;
    2. College of Chemistry and Materials Science, Shaanxi Normal University, Xi’an 710062, China
  • Received:2010-05-27 Revised:2011-01-21 Online:2011-03-25 Published:2011-03-03
  • Contact: LIU Fang E-mail:lflyd7125315@126.com

摘要: 将纳米氧化铁修饰电极制备成电位型传感器用于抗坏血酸的测定,并研究其性能、测定条件及干扰物质的影响。结果表明:该传感器在pH6.5的磷酸缓冲溶液中对抗坏血酸标准溶液的线性范围1.0×10-6~1.0×10-3mol/L呈良好的线性关系(r=-0.9969),斜率为-30.2,检出限为8.9×10-7mol/L。利用该传感器测定橙汁和VC药片中的抗坏血酸,获得令人满意的结果。

关键词: 电位型传感器, 抗坏血酸, 纳米氧化铁, 修饰电极

Abstract: Nano-Fe2O3-modified graphite electrode was prepared and used as a new potentiometric sensor for the detection of ascorbic acid. The properties, determination conditions and factors of this potentiometric sensor were explored. Results indicated that the linear range of this sensor in phosphate buffer solution with pH 6.5 ranged from 1.0 × 10-6 to 1.0 × 10-3 mol/L (r = -0.9969) with-30.2 mV/pC slope and 8.9 × 10-7 mol/L detection limit. This sensor has been used for determining ascorbic acid in orange juice and vitamin C tablets with satisfactory results. 

Key words: Nano-Fe2O3, modified electrode, potentiometric sensor, ascorbic acid

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