According to the chemistry of sour taste proposed in this study,
the following strategy to reduce the sensory sourness can be provided:
‘‘not only reduce free hydrogen ions, (namely elevate pH
value), but also reduce the undissociated hydrogen ions contained
in the protonated acid species.’’ In these acids, where the pKa is
less than 2.0, it is no use reducing its content, as the acid species
is almost all anion which does not bind hydrogen ions at a pH of
about 4.0. For acids in which pKa is over 2.0, it is necessary to
reduce their content in beer for the purpose of lowering the sour
taste. The common organic acids in beer, such as acetic acid, lactic
acid, citric acid, succinic acid, pyruvic acid and fumaric acid, usually
have pKa values of more than 2.0. Therefore it will be necessary to reduce these organic acid concentrations if the sensory sourness
of a beer is to be alleviated.
According to the chemistry of sour taste proposed in this study,the following strategy to reduce the sensory sourness can be provided:‘‘not only reduce free hydrogen ions, (namely elevate pHvalue), but also reduce the undissociated hydrogen ions containedin the protonated acid species.’’ In these acids, where the pKa isless than 2.0, it is no use reducing its content, as the acid speciesis almost all anion which does not bind hydrogen ions at a pH ofabout 4.0. For acids in which pKa is over 2.0, it is necessary toreduce their content in beer for the purpose of lowering the sourtaste. The common organic acids in beer, such as acetic acid, lacticacid, citric acid, succinic acid, pyruvic acid and fumaric acid, usuallyhave pKa values of more than 2.0. Therefore it will be necessary to reduce these organic acid concentrations if the sensory sournessof a beer is to be alleviated.
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