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Sporamin is a storage protein in sweet potato tubers. In batch fermentation of recombinant Saccharomyces cerevisiae using selective yeast nitrogen base, the specific trypsin inhibitory activity of sporamin can reach a level of 463 U/g-cell and total volumetric activity of 1574 U/l. However, using non-selective YPAD medium (20 g/l glucose, 10 g/l yeast extract, 10 g/l peptone and 10 g/l ammonia sulphate),...
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