BCA Protein Assay Kit

BCA蛋白定量试剂盒

¥298.00

CW0014S

500 microplate assays or 50 tube assays

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  • 产品参数
  • 产品说明书
  • FAQs
  • 相关文献
BCA蛋白定量法是目前广泛使用的蛋白定量方法之一。本产品是基于BCA(Bicin-choninic Acid)法研制而成,实现了对蛋白质进行快速、稳定、灵敏的浓度测定。其原理是在碱性环境下蛋白质分子中的肽链结构能与Cu2+络合生成络合物,同时将Cu2+还原成Cu+。BCA试剂可敏感特异地与Cu+结合,形成稳定的有颜色的复合物。在562 nm处有高的光吸收值,颜色的深浅与蛋白质浓度成正比,可根据吸收值的大小来测定蛋白质的含量。本试剂盒含有牛血清白蛋白(BSA)溶液作为蛋白质标准品溶液,测定范围为20~2000 μg/ml。
保存条件 运输条件
BSA Standard Solution:2-8℃,others RT(15-30℃) 常温
Q1:微量BCA蛋白定量试剂盒(CW2011)与BCA蛋白定量试剂盒(CW0014)的主要区别是什么?
A1:

微量BCA蛋白定量试剂盒(CW2011)适用于低浓度蛋白样品,检测范围更灵敏(2.5-200 μg/mL),而标准BCA试剂盒(CW0014)适用于较高浓度范围(20-2000 μg/mL)。

Q2:样本浓度超出标准曲线范围应如何处理?
A2:

若样本浓度过高,应进行适当稀释;若浓度过低,建议浓缩样本或使用灵敏度更高的微量BCA蛋白定量试剂盒 (CW2011)

Q3:标准曲线 R² 值不达标可能的原因?
A3:

通常由加样误差引起,建议校准移液器并确保操作准确;可剔除明显偏差点后重新拟合曲线,但需确保标准曲线包含不少于5个有效浓度点。

Q4:BCA 试剂出现沉淀是否影响使用?
A4:

可于 37℃孵育并搅拌助溶;若出现微生物污染,则不建议继续使用。

Q5:是否可用纯水直接溶解BSA标准品?
A5:

建议使用与待测蛋白样品相一致的稀释液(如PBS、生理盐水或样品缓冲液)来溶解和稀释BSA标准品,以保持标准品与样品背景的一致性和结果的准确性。

Q6:每次实验是否都需要制作标准曲线?
A6:

是的,由于显色受时间和温度影响显著,建议每次实验均制作新的标准曲线以保证准确性。

Q7:低浓度点吸光值接近空白孔,准确度差怎么办?
A7:

这是信噪比不足所致,建议延长孵育时间或提高孵育温度以增强信号;若信噪比仍不足,可舍弃该点但需保留至少5个有效浓度点。

Q8:BCA工作液如何保存?
A8:

工作液需现配现用,在室温密封条件下可稳定保存24小时;为防止操作误差,配制时建议额外多配制1-2个样本的用量。

Q9:哪些物质会干扰 BCA 测定?
A9:

较高浓度的还原剂(如 DTTβ-巯基乙醇)、脂类、硫酸铵等会干扰测定。建议查阅产品说明书中的干扰物质表,或换用 Bradford 法试剂盒(CW0013CW8213)。

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