产品名称：Hoechst 33342 *UltraPure grade*|Hoechst 33342 超级纯 产品价格：540 产 地：AAT Bioquest 产品货号：AAT-17530 产品规格：100 mg 背景资料 Hoechst染料是一类在显微观察中标记DNA的荧光染料。因为这类荧光染料能标记DNA，所以它们也经常用于细胞核和线粒体的显像观察。这类染料中两个相关的染料Hoechst 33258和Hoechst 33342经常使用。这两种染料都在紫外光下350nm处被激发，都在461nm处最大发射光附近发射蓝/青色荧光。Hoechst染料可以用于活细胞或者固定化细胞，并且经常用来代替其它核酸染料如DAPI。这两种染料关键的不同点在于，与DAPI相比，Hoechst 33342加有乙基，这使它具有更强的亲脂性，因此能更好的透过完整的细胞膜。在一些实验中，Hoechst 33258的渗透性明显比Hoechst 33342要弱些。这些染料也可以用来检测样品中的DNA含量，通过绘制发射光强度与DNA含量的标准曲线。 产品描述 Hoechst 33342 超级纯产品的光谱学相关参数为Ex=350nm / Em=461nm；其对应分子量大小为561.93MW。 保存建议 对于 Hoechst 33342 超级纯 产品，我们推荐使用常温进行运输。在您收到货物后，我们建议在低于-15℃温度下冷冻保存，要求储存环境干燥并避免光照。产品有效期为12个月。 The Hoechst stains are a family of fluorescent stains for labeling DNA in fluorescence microscopy. Because these fluorescent stains label DNA, they are also commonly used to visualize nuclei and mitochondria. Two of these closely related bis-benzimides are commonly used: Hoechst 33258 and Hoechst 33342. Both dyes are excited by ultraviolet light at around 350 nm, and both emit blue/cyan fluorescence light around an emission maximum at 461 nm. The Hoechst stains may be used on live or fixed cells, and are often used as a substitute for another nucleic acid stain, DAPI. The key difference between them is that the additional ethyl group of Hoechst 33342 renders it more lipophilic, and thus more able to cross intact cell membranes. In some applications, Hoechst 33258 is significantly less permeant. These dyes can also be used to detect the contents of a sample DNA by plotting a standard emission-to-content curve.
