荧光分析法(fluorescenceanalysis
荧光光谱基础; 蛋白质的荧光特性; 荧光分光光度计的结构和原理。吸收光谱和荧光光谱能级跃迁示意图 (一)荧光的产生 某些物质受紫外光或可见光照射激发后能发射出比激发光波长较长的荧光。此化学物质能从外界吸收并储存能量(如光能、化学能等)而进入激发态,当其从激发态再回复到基态时,过剩的能量可以电磁辐射的形式放射(即发光)。荧光发射的特点是:可产生荧光的分子或原子在接受能量后即刻引起发光;而一旦停止供能,发光(荧光)现象也随之在瞬间内消失。 可以引起发射荧光的能量种类很多,由光激发所引起的荧光称为致荧光。由化学反应所引起的称为化学荧光,由X线或阴极射线引起的分别称为X线荧光或阴极射线荧光。荧光免疫技术一般应用致荧光物质进行标记。(二)荧光效率 荧光分子不会将全部吸收的光能都转变成荧光,总或多或少地以其他形式释放。荧光效率是指荧光分子将吸收的光能转变成荧光的百分率,与发射荧光光量子的数值成正比。 荧光效率=发射荧光的光量分子数(荧光强度......阅读全文
Glycosphingolipid analysis
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