【摘要】 本文基于脱氧核糖核酸 (DNA)对有机染料中性红的共振光散射的增强效应 ,拟订了一种测定DNA的共振光散射法。在pH 5 0～ 7 0范围内 ,有机染料中性红在DNA分子表面进行长距组装导致共振光散射增强。在 335 0nm处的共振光谱散射增强程度与DNA浓度呈线性关系 ,其线性范围为 0～ 6 0 0ng·mL-1,检出限可达 12 8ng·mL-1。该方法简便、快速 ,具有较高的灵敏度和准确度。将该方法用于混合样品中DNA的测定 ,结果令人满意。更多还原

【Abstract】 The method is based on the enhancement effect of the resonance light scattering (RLS) due to the long range assembly of neutral red (NR) on the molecular surface of DNA.The RLS of NR is greatly enhanced by DNA in the pH range of 5 0-7 0.The enhanced intensity of RLS at 335 0 nm is proportional to the concentration of DNA in the range 0-600 ng·mL -1 .The detection limit is 12 8 ng·mL -1 .This method is simple,rapid and has been applied to the determination of DNA in mixed samples with satisfactory results.更多还原