食品科学
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庞向东，张 梅，江 虹*
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重庆市教委科技基金资助项目（KJ1401226）
PANG Xiangdong, ZHANG Mei, JIANG Hong
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摘要：
建立定量测Fe（Ⅲ）的瑞利光散射新方法，并研究适宜的反应条件及瑞利散射光谱特征。结果发现，在pH 3.4～6.8的Tris-盐酸介质中，Fe（Ⅲ）与溴甲酚绿结合，导致瑞利光散射明显增强，并产生新的瑞利散射光谱。最大瑞利散射峰位于波长339 nm处，在此波长处，瑞利散射增强程度（ΔIRLS）与Fe（Ⅲ）质量浓度在0.005～0.17 mg/L范围内呈良好的线性关系，检出限为0.002 4 mg/L。方法可用于市售奶粉中Fe含量的测定，结果满意。
关键词: 溴甲酚绿, 铁, 奶粉, 瑞利散射
Abstract:
A new Rayleigh light scattering (RLS) method for quantifying Fe(Ⅲ) was developed. In Tris-HCl buffer medium at pH 3.4–6.8, Fe(Ⅲ) could be bound to bromocresol green to form a new product, leading to a distinctly enhanced RLS and the appearance of a new RLS. The maximum Rayleigh scattering peak was located at 339 nm. The RLS intensity (ΔIRLS) was directly proportional to Fe(Ⅲ) concentration in the range of 0.005 to 0.17 mg/L with the limit of detection being 0.002 4 mg/L. Therefore, a new and accurate Rayleigh light scattering method for quantifying Fe(Ⅲ) was developed. The optimal reaction conditions and Rayleigh scattering spectral characteristics were investigated. The method has been applied to the determination of iron in milk powder with satisfactory results.
Key words: bromocresol green, iron, milk powder, Rayleigh scattering
中图分类号:
O657.3
庞向东，张 梅，江 虹*. 溴甲酚绿探针瑞利光散射技术快速测定奶粉中的铁[J]. 食品科学, doi: 10.7506/spkx1002-6630-201520028.
PANG Xiangdong, ZHANG Mei, JIANG Hong. Fast Determination of Iron in Milk Powder by Rayleigh Light Scattering Technique with Bromocresol Green as Probe[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201520028.
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