Journal
FOOD CHEMISTRY
Volume 211, Issue -, Pages 883-891Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.05.138
Keywords
Cell wall pectin; Depolymerisation; Softening; Tissue failure; Ethylene
Funding
- European COST Action [FA1106]
- Research Council of the KU Leuven [OT 12/055]
- Flanders Fund for Scientific Research [G.0603.08]
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Kanzi is a recently developed apple cultivar that has an extremely low ethylene production, and maintains its crispiness during ripening. To identify key determinants of the slow softening behaviour of Kanzi apples, a comparative analysis of pectin biochemistry and tissue fracture pattern during different ripening stages of Kanzi apples was performed against Golden Delicious, a rapid softening cultivar. While substantial pectin depolymerisation and solubilisation was observed during softening in Golden Delicious apples, no depolymerisation or increased solubilisation was observed in Kanzi apples. Moreover, tissue failure during ripening was mainly by cell breakage in Kanzi apples and, in contrast, by cell separation in Golden Delicious apples. Kanzi apples had lower activity of beta-galactosidase, with no decline in the extent of branching of the pectin chain. A sudden decrease in firmness observed during senescence in Kanzi apples was not due to middle lamella dissolution, as tissue failure still occurred by cell breakage. (C) 2016 Elsevier Ltd. All rights reserved.
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