
A diastase (z; from Greek διαστασις, `separation`) is any one of a group of into maltose. Alpha amylase degrades starch to a mixture of the disaccharide maltose, the trisaccharide maltotriose, which contains three α (1-4)-linked glucose residues, and oligosaccharides known as dextrins that contain the α (1-6)-linked glucose branches. .....
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http://en.wikipedia.org/wiki/Diastase

• (n.) A soluble, nitrogenous ferment, capable of converting starch and dextrin into sugar.
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http://thinkexist.com/dictionary/meaning/diastase/

A mixture of enzymes present in malt which converts starch into maltose. This action forms the basis of the brewing process.
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<physiology> A soluble, nitrogenous ferment, capable of converting starch and dextrin into sugar. ... The name is more particularly applied to that ferment formed during the germination of grain, as in the malting of barley; but it is also occasionally used to designate the amylolytic ferment contained in animal fluids, as in the saliva. ... ...
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(di´ә-stās) a combination of enzymes produced during germination of seeds, and contained in malt; it converts starch into maltose and then into glucose.
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http://www.encyclo.co.uk/local/21001
Di'a·stase noun [ Greek ... separation, from ..., ... to stand apart;
dia` through + ..., ..., to stand, set: confer French
diastase . Confer
Diastasis .]
(Physiol. Chem.) A soluble, nitrogenous ferment, capable of converting starch and dextrin into sugar. » The n...
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http://www.encyclo.co.uk/webster/D/59

Type: Term Pronunciation: dī′a-stās Definitions: 1. A mixture, obtained from malt and containing amylolytic enzymes (principally α- and β-amylases), that converts starch into dextrin and maltose; used to make soluble starches, to aid in digestion of starches in certain types of dyspepsia, and to digest glycogen in histolog...
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http://www.medilexicon.com/medicaldictionary.php?t=24538

Diastase is a complex nitrogenous organic compound contained in germinating barley, oats, saliva and in the secretions of the pancreas. It is an enzyme which causes the fermentation of starch first into dextrine and then into glucose. The diastases from different sources are perhaps different. It is obtained by digesting in a mixture of three parts...
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http://www.probertencyclopaedia.com/browse/GD.HTM

An enzyme mixture capable of gelatinizing and converting starch to dextrins and sugars.
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http://www.winning-homebrew.com/brewing-terms.html

An enzyme possessing the power to convert starches into dextrose and maltose.
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https://www.encyclo.co.uk/local/21409

an enzyme that breaks down starch into maltose, then dextrose, and is present in malt.
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https://www.infoplease.com/dictionary/diastase
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