Q 溴化乙锭(EB)用途是什么？

溴化乙锭(EB)EB不能穿过活细胞膜,可通过死细胞破损膜对细胞核DNA染色,含一个可嵌入堆积碱基之间的一平面基团,该基团固定位置及与碱基密切接近,致染料与DNA结合现荧光,因EB-DNA复合物荧光产率远大于未结合染料荧光,当电泳凝胶中含游离EB,可测少量DNA,是高灵敏荧光试剂,也是重要荧光染料,常测DNARNA.与DNA结合抑制DNA复制转录;Ethidium bromide (EtBr) is the most commonly used nucleic acid stain for PAGE or agarose gel electrophoresis. The fluorescence of EtBr increases 21-fold upon binding to double-stranded RNA and 25-fold on binding double-stranded DNA so that destaining the background is not necessary with a low stain concentration (10 渭g/ml). Ethidium bromide has been used in a number of fluorimetric assays for nuc leic acids. It has been shown to bind to single-stranded DNA (although not as strongly) and triple-stranded DNA. Because of its ability to bind to DNA, EtBr is an inhibitor of DNA polymerase. Antiprot ozoal (Trypanosoma).;溴化乙锭是一种高度灵敏的荧光染色剂，用于观察琼脂糖和聚丙烯酰胺凝胶中的DNA。溴化乙锭用标准302nm 紫外光透射仪激发并放射出橙红色信号，可用Polaroid 底片或带CCD 成像头的凝胶成像处理系统拍摄。 对于在电泳后进行凝胶染色，应先用水将储存液样品稀释到 0.5μg/ml，再将凝胶孵育 15-30 分钟。通常无需脱色，但是如果必须降低背景色，则可在水中脱色 15 分钟。然后可在紫外灯箱（254nm 波长）中检测 DNA 条带。也可将溴化乙啶加到凝胶和电泳缓冲液（终浓度 0.5μg/ml）中，并在电泳后立即显影。