Large and small starch granules prepared from Proctor barley contain high levels of firmly bound protein. Experiments with α-amylase under simulated mashing conditions suggest that this protein limits the rate of starch breakdown during mashing. Gel electrophoresis shows hordein to be a principal component. Treatment with cysteine or malt endopeptidase changes the nature of the associated protein.
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Slack et al. (1979) studied this question.
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