In conclusion, the recoveries of all the isoflavones in
soybean, soaked bean, soybean and tofu ranged from
65% to 91% based on the extraction and HPLC method
used in this study. The concentrations of glucosides,
acetylglucosides and malonylglucosides in soybeans
must follow a decreased order for the increase of both
soaking temperature and time, because of conversion to
aglycones by cleaving the ester or glucosidic group.
However, for aglycones, the concentrations increased
with above condition. During heating of soymilk, the
concentrations of glucosides and acetylglucosides
showed an increase while malonylglucosides decreased
and the aglycones did not show significant change.
In conclusion, the recoveries of all the isoflavones insoybean, soaked bean, soybean and tofu ranged from65% to 91% based on the extraction and HPLC methodused in this study. The concentrations of glucosides,acetylglucosides and malonylglucosides in soybeansmust follow a decreased order for the increase of bothsoaking temperature and time, because of conversion toaglycones by cleaving the ester or glucosidic group.However, for aglycones, the concentrations increasedwith above condition. During heating of soymilk, theconcentrations of glucosides and acetylglucosidesshowed an increase while malonylglucosides decreasedand the aglycones did not show significant change.
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