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As pstew mentioned, SDS based lysis followed by FASP is a very good way. However, FASP can lead to sample losses. I would use it only if you have large culture of bacterial cells. If you want totally detergent free method then, lyse cells in 8 M guanidinium hydrochloride buffered to pH 7.5-8.2 using 50 mM Tris buffer or 50 mM freshly prepared ammonium ...

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