高效液相色谱分析兔脑脊液中脑啡肽、脑新肽和P物质

应用高效液相色谱法分析神经肽的报道,近几年来逐渐在增多,已成功地对各种组织和体液中的肽进行分析。但在用紫外检测时,由于灵敏度低,受到一定限制。一般改进的办法是将邻苯二甲醛与肽反应,生成具有强荧光的衍生物,如用荧光检测器     

Photoluminescence of silicone oil treated by fluorocarbon plasma

We investigated photoluminescence characteristics of silicone oils treated by C2F6 and CHF3 plasma. The silicone oil treated by the C2F6 plasma emitted a white light mainly composed of 415 nm, 469 nm, and 554 nm emissions, while that treated by the CHF3 plasma emitted a pink light (415 nm). Fourier transformed infrared spectroscopy and Raman spectroscopy studies showed that the photoluminescence was correlated with the Si-C bond, the carbon-related defects and the oxygen vacancies. It was suggested that the light emitting at 554 nm was related to the Si-C bond and the carbon-related defects, while the pink emission at 415 nm was related to the oxygen vacancies.     

固体进样-石墨炉原子吸收法测定农产品中重金属元素含量

采用直接固体进样-石墨炉原子吸收光谱法(SS-GFAAS)测定农产品中镉、铅、铜和铬重金属元素含量.通过标准物质、质控样品和电感耦合等离子体质谱法比对试验验证,各元素方法检出限均低于25 pg.方法操作简单、对环境友好、重复性好、结果准确、检出限低,满足农产品检测要求.