食品科学 ›› 2012, Vol. 33 ›› Issue (22): 177-180.

• 分析检测 • 上一篇    下一篇

碘化钾-罗丹明6G分光光度法测定面粉中过氧化苯甲酰

沙 鸥1,2,李亚鑫1   

  1. 1.淮海工学院化学工程学院 2.江苏省海洋资源开发研究院分析测试中心
  • 收稿日期:2012-05-08 修回日期:2012-10-20 出版日期:2012-11-25 发布日期:2012-11-20
  • 通讯作者: 沙鸥 E-mail:7993259@163.com
  • 基金资助:

    国家自然科学基金面上项目;江苏省海洋资源开发研究院科技开放基金立项项目;淮海工学院2011年自然科学类校内课题

Spectrophotometric Determination of Benzoyl Peroxide in Wheat Flour Using KI-Rhodamine 6G System

  • Received:2012-05-08 Revised:2012-10-20 Online:2012-11-25 Published:2012-11-20
  • Contact: ou sha E-mail:7993259@163.com

摘要: 采用碘化钾-罗丹明6G分光光度法对面粉中过氧化苯甲酰(BPO)含量进行测定。在硫酸介质中,有聚乙烯醇存在下,过氧化苯甲酰氧化I-生成I3-,再与罗丹明6G形成离子缔合物,该缔合物在560nm波长处有最大吸收峰,在0.3~5.9mg/L范围内,BPO浓度与吸光度呈良好线性关系,线性方程为A=0.2174+0.0833c/(mg/mL),线性相关系数为0.9985,表观摩尔吸光系数为2.13×104L/(cm·mol)。该法用于两份市售面粉中过氧化苯甲酰的测定,平均回收率分别为96.5%和98.6%,并将测定结果与高效液相色谱测定结果进行对比,误差在5%以内,结果令人满意。

关键词: 光度法, 过氧化苯甲酰, 罗丹明6G, 面粉

Abstract: A sensitive spectrophotometric method has been developed for the determination of trace amounts of benzoyl peroxide (BPO) based on the oxidation of I- to I3- by BPO and the further reaction of I3- with rhodamine 6G to form an ion association complex in H2SO4 solution. The ion association complex had maximum absorption at 560 nm and its absorbance (A) showed a good linear relationship with BPO concentration (c, mg/mL) within the range of 0.3–5.9 mg/L: A = 0.2174 + 0.0833 c, with a correlation coefficient of 0.9985. The calculated apparent molar absorption coefficient was 2.13 × 104 L/(cm·mol). The average spike recovery rates of BPO in two commercial samples were 96.5% and 98.6%, respectively. Satisfying results were obtained in practical applications of this method with a relative error of less than 5% compared with HPLC results.

Key words: spectrophotometry, benzoyl peroxide, rhodamine 6G, wheat flour

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