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Old 06-14-2016, 06:27 AM   #3
Location: Hawaii, USA

Join Date: Feb 2012
Posts: 20

Apologies for the lack of detail.

I am using fish liver tissue.

It is a tissue that I have never had too much problem carrying out extractions with before (for ethanol stored tissue). In fact the issue previously has always been too much DNA!

I have soaked the tissue prior to lysis in both water and 1 x TE, it did not seem to noticeably improve the results. Would you expect a better removal of guanidine salts with PBS?

I am pretty certain that it is co-precipitaiton of guanidine salts from the RNAlater that is the main cause of the low 260/230 ratio and also is keeping DNA bound and unaccessible - hence the low yields. Once when trying a spooling protocol (the ThermoFisher protocol to be exact), I got massive amounts of salt precipitating out. However I would be happy to be proved wrong!
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