粮油食品科技

中国科技核心期刊

小麦粉中溴酸钾含量快速测定方法研究
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Rapid determination of potassium bromate content in wheat flour
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    摘要:

    根据溴酸钾(KBrO3)可在酸性条件下氧化3,3′,5,5′-四甲基联苯胺(TMB)而显色的原理,建立了小麦粉中溴酸钾定性检测的目视比色法和定量检测的分光光度法。研究了体系酸度、显色液用量、反应时间对显色的影响,并确立了最优化的实验条件。结果表明:在最优化实验条件下,显色体系〖JP3〗的颜色随溴酸钾含量的升高而逐渐加深,溴酸钾浓度在0~4 mg/L范围内符合比尔定律,线性回归方程为ΔA=0.2437C-0.005 2,R2=0.999 3。可用于实际样品的测定,目视比色法可快速确定溴酸钾的含量范围,分光光度法的回收率为96.51%~101.70%,RSD为1.79%~3.12%,能够满足市场监管的需求。

    Abstract:

    According to the theory that 3,3′,5,5′-tetramethylbenzidine(TMB) can be oxidized under acid condition by potassium bromate (KBrO3) and the principle of color reaction, potassium bromate content in wheat flour was detected by qualitative detection of visual colorimetry and quantitative detection of spectrophotometry. The effects of system acidity, color liquid dosage, reaction time on the change of color were studied, and the experimental conditions were optimized. Results showed that under the optimal experimental conditions, the color gradually deepened as the potassium bromate content rose, and the concentration of potassium bromate within the range of 0~4 mg/L in line with the beer′s law. The linear regression equation was ΔA=0.2437 C-0.0052 with R2=0.999 3. These methods can be applied in practice, visual colorimetric method can determine the content of potassium bromate rapidly and the recovery rate of spectrophotometric method was 96.51%~101.70%, RSD 1.79%~3.12%, which can meet the needs of the supervise of food safety in the market.

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刘海顺,宋立山,巩蔼,张德伟.小麦粉中溴酸钾含量快速测定方法研究[J].粮油食品科技,2015,23(3):66-68.

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  • 在线发布日期: 2015-09-06
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