Since the green colour is one of the major sensory characteristics
in determining the final quality of thermally processed
green vegetables, it is important to prevent or at
least minimise chlorophyll degradation during thermal processing
in the food industry. pH control, as mentioned previously,
is one of the methods for preventing green colour loss.
Because the pH effect on chlorophyll degradation has not
been studied extensively, the present investigation was conducted
for determining the effect of pH on kinetic parameters
in green colour changes of vegetables. In this research,
kinetic parameters for chlorophyll a, chlorophyll b and
visual green colour degradation as a function of pH in buffered
solutions at pH 5.5, 6.5 and 7.5, in blanched green peas
at 70, 80, 90 and 100 C, have been studied by high performance
liquid chromatography and tristimulus colorimetry.
Since the green colour is one of the major sensory characteristicsin determining the final quality of thermally processedgreen vegetables, it is important to prevent or atleast minimise chlorophyll degradation during thermal processingin the food industry. pH control, as mentioned previously,is one of the methods for preventing green colour loss.Because the pH effect on chlorophyll degradation has notbeen studied extensively, the present investigation was conductedfor determining the effect of pH on kinetic parametersin green colour changes of vegetables. In this research,kinetic parameters for chlorophyll a, chlorophyll b andvisual green colour degradation as a function of pH in bufferedsolutions at pH 5.5, 6.5 and 7.5, in blanched green peasat 70, 80, 90 and 100 C, have been studied by high performanceliquid chromatography and tristimulus colorimetry.
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