胶体金侧向流免疫层析技术检测有机磷农药残留

目的在已制备出抗一类有机磷农药的组特异性单克隆抗体的基础上,制备胶体金,从而快速地对上述有机磷农药进行检测。方法通过鞣酸-柠檬酸三钠还原法制备出直径16.08±0.64 nm、质地均一的胶体金,并且以此标记单克隆抗体,组装胶体金免疫层析检测板。利用紫外光谱、荧光光谱、透射电镜、动态光散射等方法对胶体金及金标抗体进行鉴定。结果该检测板对标准毒死蜱的检测限为4μg/m L,检测时间为5 min。结论胶体金试纸条对毒死蜱具有较好的检测灵敏度,并且基质的干扰效应不明显。     

Hydrothermal synthesis of Y3NbO7 nanowires for the photocatalytic degradation of omeprazole sodium

Novel Y₃NbO₇ nanowires were successfully synthesized by a facile hydrothermal method using Y(NO₃)₃·6H₂O and Nb₂O₅ as raw materials. X-ray power diffraction (XRD), High resolution transmission electron microscopy (HR-TEM), UV–vis diffuse reflectance spectroscopy (UV–vis-DRS), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) techniques were employed to determine the structure, morphology, specific surface area and optical properties of the as-prepared samples. Photocatalytic examination of the samples was carried out using aqueous solution of omeprazole sodium under visible light irradiation. The effects of initial omeprazole sodium concentration and catalyst amount on the photocatalytic degradation were also investigated. Detailed characterization demonstrated that Y₃NbO₇ nanowires have cubic fluorite crystal structure with a diameter of about 20 nm and a length up to several micrometers. Photocatalytic activity tests revealed that omeprazole sodium photocatalytic reactions followed pseudo-first-order kinetics and Y₃NbO₇ nanowires exhibited greater photocatalytic activity than its bulk counterparts.