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When using Trizol to extract RNA from animal liver, the 260/230 ratio is only 1.2. Is this due to fat interference?

Lab Techniques
Asked by:董静娟 2026-07-02 Views 242 4 answers
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K
Kevin 2026-09-11
如果电泳条带完整,260/230低可以先不纠结,看下游用途。做qPCR或建库前可以用柱式RNA Cleanup过一遍,能明显改善230,回收率一般也够用。我们以前做肝脏RNA,过柱后230能到1.7以上,RIN和28S/18S比单纯看260/230更有参考价值。注意过柱会损失一些RNA,所以得率要重新测。Trizol提取本身对多糖脂肪的去除有限。
T
Tony 2026-07-25
260/230低更常见的是氯仿取上清时带到了有机相或盐残留。肝脏匀浆太剧烈、分层后离心时间短,都会让中间层蛋白和下层有机相混上来。建议你取上清时不要贪多,留约1mm,再补等体积氯仿抽提一次,然后异丙醇沉淀;75%乙醇洗两次,第二次离心时间延长。匀浆时冰浴间歇,也可以减少有机相乳化。这种做法我做过,比值能改善不少,尤其脂肪肝样本。
飞
飞飞达人4426 2026-09-23
动物营养试验取肝脏,建议安乐死后尽快取小块,冰上剪碎再入Trizol。30mg用1mL Trizol理论上够,但电动匀浆时间要短、间歇冰浴,避免过热导致乳化。脂肪多的肝脏可先用预冷PBS轻轻冲一下血水,吸水纸吸干再入Trizol。260/230 1.2如果RNA得量和完整度都够,可以继续实验,但在报告里注明纯度偏低,避免审稿人追问。
P
Plateing9528 2026-09-24
肝脏本身脂肪和糖原确实可能影响260/230,但1.2不一定全是脂肪。你260/280有1.85、28S和18S条带也还行,说明RNA主体问题不大。糖原在异丙醇沉淀时容易一起带下来,会让沉淀变胶状、230偏高。可以试试把取样量降到20mg以内,或者Trizol加到1.5mL;异丙醇沉淀后如果沉淀偏透明,用75%乙醇多洗一次,尽量吸干。下游如果不是特别敏感的实验,可以先跑胶看完整度,别只盯230。
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