apple is a fruit that is very popular today, but most of the problems found in the apple. Or in fruit browning reaction is mainly due to a Polyphenol oxidase (PPO) and peroxidase (POD), the pH of the reaction to the enzyme phenol level is between 5-7 browning reaction. this enzyme reacts with oxygen (oxidation) occurs when cells of the lives of the bruised, torn, crushed on impact, sliced or chopped enzyme. Reactive substances (substrate) and oxygen comes into contact with
the substance monophenol (colorless) is oxidized to a phenol (diphenol), which is colorless and is oxidized to be. o-quinone
which reacts with the amino acid or protein has a brown substance. And to unite the polymer molecules are large and brown, like melanin (melanin).
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