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After extracting protein from porcine muscle tissue, what should I do if Coomassie Brilliant Blue staining always results in a dark background?

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Asked by:谢娟佳 2026-07-28 Views 239 4 answers
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All Answers4
余
余耗材2132 2026-08-23
R250染色过夜对肌肉样品确实容易背景深。可以把染液浓度从0.25%降到0.05%-0.1%,染1-2小时即可;或者换考马斯亮蓝G250胶体染色,背景会低很多。如果必须过夜,染完先水洗10分钟再脱色。固定也很关键:跑完胶用50%甲醇/10%乙酸固定20分钟,可减少小分子蛋白丢失并降低背景。脱色液体积至少没过胶2-3倍,小盒子容易饱和。
科
科研小哥1508 2026-09-18
肌肉组织高丰度肌动蛋白、肌球蛋白多,上样量不要大,建议每孔20-40μg总蛋白,过多会背景深、条带糊。裂解要充分,加蛋白酶抑制剂,超声或研磨助溶。如果怀疑脂质多,可用冷丙酮沉淀蛋白后重溶再定量、上样。电泳后先固定再染色。脱色过程中可把胶放到白纸上观察,背景变透明即可停,不要过度脱色导致弱条带丢失。仍背景高就换胶体考染或缩短染色时间。
T
Tom4486 2026-09-12
脱色液建议用甲醇:乙酸:水=4:1:5或5:1:4,别只用乙醇,脱色效率差。过夜染色后先用大量水漂洗胶面,再放脱色液。不要一晚上不管:前2小时每20-30分钟换一次,看到脱色液变蓝就换;之后再换一两次过夜。脱色盒里放一小块海绵或无纺布可吸附染料。想加速可微波低火加热,但胶容易开裂,不建议新手。换到第4次还很蓝,就要怀疑不是游离染料,而是样品本底。
E
Emma 2026-09-12
背景深和肌肉样品脂质、未除净的组织碎片关系很大。裂解后如果上清里飘着油脂或细颗粒,电泳时会在胶面形成非特异吸附,脱色后背景发蓝。建议裂解后4℃高速离心,取中间清液,避开上层脂肪和底部沉淀;上样前可再过一次离心。裂解液里可加0.1% Triton X-100或NP-40帮助去脂,但注意去污剂可能影响考马斯亮蓝,洗脱充分再染色。样品提取液不要放太久。
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