I am preparing CTAB buffer and I read that addition of PVP (Polyvinylpyrrolidone) helps to remove phenolic compounds. Most of the times in protocols there is no additional information about average molecular weight of used PVP, but I found in some, where it was specified that it was PVP 40 (mol wt 40 000) for DNA extraction. But I wanted to know if I can use the same for RNA extraction or should I use PVP 360 (mol wt 360 000)?

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