DNA链荧光染色。

DAPI是一种可以穿透细胞膜的蓝色荧光染料。和双链DNA结合后可以产生比DAPI自身强20多倍的荧光。和EB(ethidium bromide)相比，对双链DNA的染色灵敏度要高很多倍。

DAPI染色常用于细胞凋亡检测，染色后用荧光显微镜观察或流式细胞仪检测。DAPI也常用于普通的细胞核染色以及某些特定情况下的双链DNA染色。

DAPI的*激发波长为340nm，*发射波长为488nm；DAPI和双链DNA结合后，*激发波长为364nm，*发射波长为454nm。

本DAPI溶液用水配制，加热有助于溶解。

用于细胞核染色时，推荐的DAPI工作浓度为0.5-10μg/ml。

运输与保存方法
常温运输。粉末在室温下稳定，需避光储存。
注意事项
1)DAPI对人体有一定刺激性，请注意适当防护。
2)荧光染料都存在淬灭的问题，建议染色后尽量当天完成检测。
3)为减缓荧光淬灭可以使用抗荧光淬灭封片液。
4)为了您的安全和健康，请穿实验服并戴一次性手套操作。
配制母液
用双蒸水溶解，终浓度为1mg/ml。本产品不可以用缓冲液直接溶解。-20℃可保存1年，建议分装保存，避免反复冻融。
使用方法
1.配制工作液：用双蒸水或PBS稀释母液，配制成所需要的工作的浓度（0.5-10μg/ml）。
2.固定的细胞或组织染色：
对于固定的细胞或组织样品，固定后，适当洗涤去除固定剂。DAPI染色通常在其他染色的*进行。如果不需要进行其它染色，则直接进行DAPI 染色。
a)对于贴壁细胞或组织切片：加入适量DAPI染色液，覆盖住样品即可。
对于悬浮细胞：至少加入待测染色样品体积3倍的染色液，混匀。室温放置3-5分钟。
b)吸除DAPI染色液，用TBST、PBS或生理盐水洗涤2-3次，每次3-5分钟。
c)直接在荧光显微镜下观察或封片后荧光显微镜下观察。激发波长360nm，发射波长460nm。
3. 活细胞或组织染色：
a)细胞培养物中加入适量DAPI染色液，约1/10细胞培养基体积，必须充分覆盖住待染色的样品。通常对于六孔板一个孔需加入1ml染色液，对于96孔板一个孔需加入100μl染色液。
b)在 37℃培养细胞 10～20 分钟。
c)用 PBS或合适的缓冲液洗细胞两次。

d)直接在荧光显微镜下观察或封片后荧光显微镜下观察。激发波长360nm，发射波长460nm。

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