原文由 ruojun 发表:
jiankang123朋友询问如何用酶标仪测定BCA蛋白浓度,可以用图示一下吗?有知道的么?
1. 根据样品数量,按50体积BCA试剂A加1体积BCA试剂B(50:1)配制适量BCA工作液,充分混匀。BCA工作液室温24小时内稳定。
2. 完全溶解蛋白标准品,取10微升稀释至100微升,使终浓度为0.5mg/ml。蛋白样品在什么溶液中,标准品也宜用什么溶液稀
释。但是为了简便起见,也可以用0.9%NaCl或PBS稀释标准品。
3. 将标准品按0, 1, 2, 4, 8, 12, 16, 20微升加到96孔板的标准品孔中,加用于稀释标准品的溶液补足到20微升。
4. 加适当体积样品到96孔板的样品孔中,加用于稀释标准品的溶液到20微升。
5. 各孔加入200微升BCA工作液,37℃放置30分钟。
注:也可以室温放置2小时,或60℃放置30分钟。BCA法测定蛋白浓度时,吸光度会随着时间的延长不断加深。并且显色反应
会因温度升高而加快。如果浓度较低,适合在较高温度孵育,或延长孵育时间。
6. 测定A562,540-595nm之间的波长也可接受。根据标准曲线计算出蛋白浓度。
常见问题:
1. 测定标准曲线时发现随着标准品浓度的增加吸光度或颜色没有明显变化。
可能的原因是样品中含有严重干扰BCA法测定蛋白浓度的物质,详细的BCA法的兼容性列表请参考下网页:
http://www.beyotime.com/Compatibility Chart For BCA Kit.pdf
2. 是否每次测定时都需要做标准曲线?
建议每次测定时都做标准曲线。因为BCA法测定时颜色会随着时间的延长不断加深,并且显色反应的速度和温度有关,所以除非精确控制显色反应的时间和温度,否则如需精确测定宜每次都做标准曲线。
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