Determination of pectinmethylesterase, polygalacturonase and pectic substances in some fruits and vegetables. Part II. Study into the pectolytic tissue enzymes of Jonathan apples and some other fruits and vegetables

Polacsek Racz, M.; Pozsar Hajnal, K.

Acta Alimentaria 5(3): 189-204


ISSN/ISBN: 0139-3006
Accession: 000335859

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Details are given of the method used for pectolytic enzyme activity determination in Jonathan apples and 11 other fruits and vegetables. Pectinmethylesterase (PME) activity decreased substantially in apple extract stored at 5 deg C whereas polygalacturonase (PG) activity increased. Both PME and PG activities increased in apple and other fruits and vegetables during ripening. Quick freezing and storage of apples at -20 deg reduced the activity of both enzymes. [For similar work with tomatoes see HcA 46, 4720.].