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. 2014 Apr 3;9(4):e93819. doi: 10.1371/journal.pone.0093819

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© 2014 Zhang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The activities were determined at 150 μM p-nitrophenyl acetate, and the concentrations of the tested excipients were 500 μM except that F68, EL35, RH40, lecithin, PVP and Sodium alginate were 100 μg/ml. Each data point represents the mean ± SD. The control activities by recombinant CES1A1 and CES2 were 2.62 nmol/min/mg and 35.8 pmol/min/mg, respectively.