PowerPoint Presentation of malt αamylase and βamylase αamylase βamylase 1 attack on starch...
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Transcript of PowerPoint Presentation of malt αamylase and βamylase αamylase βamylase 1 attack on starch...
large granules 25 µ small granules 5 µ
by # % 13 87
by wt % 89 11
protein % 2 1.5
gel temp C 61 92
amylose % 24 40.5
amylopectin% 74 58
Barley starch granules
Comparison of malt α amylase and β amylase
α amylase β amylase
1 attack on starch molecules randomly an endo-enzyme releases maltose an exo-enzyme
2 glucosidic link attacked α 1-4 α 1-4
3 # of reducing groups produced one one
4 optimum pH 5.5 5.2
5 optimum temperature 70 C 60 C
6 presence during malting not present in barley present but inactive in barley