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在弱酸介质中,硫化镉量子点(CdS-QDs)与硫酸依替米星(ETM)在静电引力和疏水作用力下,形成粒径更大的聚集体,导致共振瑞利散射(RRS)、二级散射(SOS)和倍频散射(FDS)显著增强,其最大散射峰分别位于310 nm(RRS),568 nm(SOS),320 nm(FDS).在一定范围内ETM浓度与三种散射增强程度(ΔI)成正比,可用于ETM的测定,其中RRS的灵敏度最高,其检出限(3σ)为1.6 ng/mL.考察了共存离子的影响,表明方法有良好的选择性.据此发展了以CdS-QDs作探针,高灵敏、简便测定ETM的共振瑞利散射新方法,用于人血清和尿样中ETM的测定,平均回收率在94.5%~113.7%之间.
In weak acid medium, cadmium sulfide (CdS-QDs) and etimicin sulfate (ETM) form larger aggregates under the electrostatic force and hydrophobic force, resulting in resonance Rayleigh scattering (RRS) The maximum scattering peak (SOS) and frequency doubling scattering (FDS) were significantly enhanced at 310 nm (RRS), 568 nm (SOS) and 320 nm (FDS), respectively. Which is proportional to the degree of enhancement (ΔI) and can be used for the determination of ETM, of which RRS has the highest sensitivity with a detection limit (3σ) of 1.6 ng / mL. The effects of coexisting ions are examined, indicating good selectivity of the method A new method for the determination of ETM using CdS-QDs as a probe and high sensitive and simple method was developed for the determination of ETM in human serum and urine samples. The average recoveries ranged from 94.5% to 113.7%.