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CELL WALL CHARACTERISTICS AND FIRMNESS OF FRESH PACK CUCUMBER PICKLES AFFECTED BY PASTEURIZATION AND CALCIUM CHLORIDE 1
Author(s) -
HOWARD L. R.,
BUESCHER R. W.
Publication year - 1990
Publication title -
journal of food biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 47
eISSN - 1745-4514
pISSN - 0145-8884
DOI - 10.1111/j.1745-4514.1990.tb00819.x
Subject(s) - pectin , pasteurization , chemistry , cell wall , food science , calcium , sugar , solubility , galactose , cellulose , biochemistry , organic chemistry
ABSTRACT Changes in cell wall pectic substances, degree of pectin methylation, bound Ca ++ , neutral sugar composition, and firmness were determined in mesocarp tissue of pasteurized and nonpasteurized fresh pack cucumber pickles. Large changes in solubility characteristics of pectic substances occurred in cell walls of nonpasteurized pickles that were attenuated by pasteurization. In particular, water and alkali soluble pectins declined, and nonextractable pectins increased during the first month of storage. The major changes in pectic substance solubility appeared to be related to reductions in the degree of pectin methylation with a minor influence of CaCl 2 . Galactose in cell walls of nonpasteurized pickles was substantially reduced, and the reduction in galactose was hindered by CaCl 2 or pasteurization. The amount of bound Ca ++ appeared to be associated with tissue firmness after one month in storage, since firmer tissue had more cell wall bound Ca ++ . While firmness was associated with the amount of bound Ca ++ , the amount of bound Ca ++ was dependent on the supply of Ca ++ and the degree of pectin methylation.