Omni-RapidTM快速蛋白定量试剂盒的原理与传统BCA蛋白定量法类似,但采用了一种不同于BCA(Bicin-choninic Acid)的全新特殊的螯合剂,从而实现了对蛋白质浓度进行快速、稳定、灵敏的测定。其原理是在碱性环境下蛋白质分子中的肽键能与Cu2+形成络合物,将Cu2+还原成Cu+,Cu+与螯合物结合,从而发生颜色反应。本试剂盒中的螯合剂可敏感特异地与Cu+结合,只需室温孵育5min即可形成稳定的橙黄色水溶性复合物,而传统BCA法则需在37℃下孵育30min才可完成颜色反应。该橙黄色的复合物在480nm处有强光吸收值,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。本试剂盒含有一系列浓度的蛋白质标准品溶液(BSA溶液),即取即用,无需稀释,方便快捷。
简单快速
室温5min完成显色反应方便快捷
提供即用型标准品,省去繁琐的稀释步骤准确性高
变异系数远小于考马斯亮蓝染色法线性范围宽
灵敏,检测范围:20~2,000μg/mL兼容性好
与大多数金属离子、螯合剂及去污剂兼容性较好配置显色工作液:
a. 计算显色工作液总量:
工作液总量 = (BSA标准品样本个数+待测样本个数)×复孔数×每个样本显色工作液体积
举例:BSA标准品样本个数为8个,待测样本个数3个,复孔数3个。
显色工作液总量 = (8个BSA标准品样本+3个待测样本)×3个复孔×200μL(每个样本工作液体积) = 6.6 mL
b. 根据计算出的所需显色工作液用量,将试剂A和试剂B按照50:1的体积比,配制显色工作液,充分混匀。
注意:
⑴试剂B刚加入试剂A时,会出现灰蓝色沉淀,但只需混匀几秒钟,沉淀就会消失,形成透亮的绿色溶液;
⑵建议工作液现用现配,在室温下,工作液会逐渐变为深绿色,但只要在1.5h内使用,对定量的准确性不会造成影响。
⑵由于加样可能存在误差,建议配制BCA工作液时,多配制1~2个孔。
定量检测:
① 分别取 即用型BSA标准品①~⑧ 各20μL加到 96孔板中( BSA标准品 使用前须充分溶解摇匀)
② 用1×PBS或0.9%生理盐水将样品适当稀释(可以多作几个梯度,如2倍、4倍、8倍稀释),加20μL到96孔板的样品孔中;
③ 各孔加入200μL显色工作液,充分混匀,盖上96孔板盖,室温孵育5min,即可进行检测;
注意:由于颜色反应速度较快,须保证在20~30min之内完成读值。如果必须在30min后才能读值,可提前加入50μL 1 M HCl终止反应。
④ 用酶标仪测定每个样品及BSA标准品的A480,注意要减去空白对照( 标准品① +工作液)的A480。
⑤ 绘制标准曲线,计算样品中的蛋白浓度。
注意:数据处理时需要去除明显错误的值。待测样品浓度可以从标准曲线中查得, 实际浓度需要乘以样品的稀释倍数。如果是计算机绘制的曲线,可以从计算机给出的线性方程式计算出待测样品的浓度。
1. 本产品可以采用酶标仪(微孔检测法)或者分光光度计(试管检测法)测定蛋白浓度,如使用普通的分光光度计测定,需根据比色皿的最小检测体积,适当加大BCA工作液的用量使不小于最小检测体积,样品和标准品的用量可相应按比例放大也可不变。使用分光光度计测定蛋白浓度时,每个试剂盒可以测定的样品数量可能会显著减少;
2. 建议每次测定蛋白样品时,都须绘制标准曲线,以获得准确数据解;
3. 完成室温孵育5 min后,须在20~30 min内完成检测,否则会影响蛋白定量的准确度;
4. 如待测样品中含较多的干扰物质(具体见附表),可采用其它蛋白定量产品;
5. 为了您的安全和健康,请穿实验服并戴一次性手套操作;
6. 本产品仅限科研使用。
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