【摘要】 研究了阴离子染料荧光桃红B(PB)对鱼精脱氧核糖核酸(fsDNA)和阳离子表面活性剂溴化十六烷基三甲铵(CTMAB)的共振光散射光谱有协同增强作用,建立了一种定量测定fsDNA的灵敏度高、操作简便的共振光散射(RLS)方法。在pH 5.33和离子强度低于0.03 mol/L的条件下,fsDNA与CTMAB和PB共同作用产生最大散射波长为340 nm的特征共振光散射增强(RLSE)信号。在优化条件下,测定fsDNA的线性范围为0.01~3.0 mg/L,检出限(3δ)为1.4μg/L。方法成功应用于合成样中DNA的测定。更多还原

【Abstract】 A highly sensitive resonance light scattering(RLS) method for the determination of fsDNA was developed.It was based on the enhancement of the intensity of RLS by the synergistical action of phloxine B(PB),fsDNA and cetyltimethylammonium bromide(CTMAB).At pH 5.33 and with ionic strength lower than 0.03 mol/L,the wavelength of the maximum intensity of RLS was 340 nm.Under optimum conditions,the linear range of the calibration curve was 0.01-3.0 mg/L with a detection limit of 1.4 μg/L.The method has been applied to the determination of DNA in synthetic samples with satisfactory results.更多还原