I have prepared a liquid medium for fermentation with kraft lignin in water, but the lignin was not completely dissolved. After fermentation, I am wondering about the best way to filter out the residual lignin. Would a "paper" filter with a pore size of 0.45 micrometers be appropriate for this purpose?
Kurt Haunreiter
How did you isolate the lignin? You may be able to get away with filter paper. I have used medium porosity fritted glass crucibles to collect insoluble lignin as well - but those are rather large particles. You may have to go as low as 0.20 microns. If you are simply mixing lignin into a solution of water - you might try mild sonication.
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