摘要
研究了Fe^3+与脱氧核糖核酸(DNA)的共振瑞利散射(RRS)光谱和适宜的反应条件。实验结果表明,在pH2.20的Britton—Robinson缓冲溶液中,Fe^3+与DNA自身的共振瑞利散射峰均较弱,但当二者发生静电作用形成缔合物后,体系的共振光散射峰增强,最大散射峰位于320.0nm处。当Fe^3+浓度为2.75×10^-3 mol/L时,在0—8.4mg/L范围内,共振光散射强度与DNA的浓度呈线性关系。检出限为2.60μg/L。据此建立了一种定量测定DNA的简便、快速的新方法。本方法用于合成样品中痕量DNA的测定,回收率为93%~101%.
A novel method based on the enhanced resonance Rayleigh scattering (RRS) of Fe ( Ⅲ) - DNA complex in Britton - Robinson buffer solution of pH 2.20 was proposed for the determination of DNA. The RRS intensity was measured at A320 nm, the maximum scattering wavelength of Fe ( Ⅲ ) - DNA complex. The characteristics of RRS spectra of Fe ( Ⅲ ) - DNA complex, the effects of pH, Fe ( Ⅲ ) concentration, the sequence of adding the reagents and the coexistent substances were studied. The RRS intensity was directly proportional to the concentration of DNA in the range of 0.0 - 8.4 mg/L with a detection limit of 2.60 μg/L. The method has been applied to the determination of DNA in synthetic samples with a recovery range of 93% - 101%.
出处
《分析测试学报》
CAS
CSCD
北大核心
2007年第6期876-879,共4页
Journal of Instrumental Analysis
基金
内蒙古自然科学基金资助项目(200607010205)
内蒙古自治区高等学校科学研究项目(NJ05040)
关键词
共振瑞利散射
脱氧核糖核酸
铁(Ⅲ)
resonance Rayleigh scattering
deoxyribonucleic acid (DNA)
Fe ( Ⅲ )