Dry bean (Phaseolus vulgaris) hardening and the consequences of pectin methylesterase activity in storage.
1991
Mafuleka M.M. | Ott D.B. | Hosfield G.L. | Uebersax M.A.
Pectin methylesterase (PME) activities (degree of pectin esterification) and hardness (Kramer shear force) of decorticated Malawi bean varieties (Phaseolus vulgaris) were evaluated at 4 and 8 months storage at 0.55 aw and 0.85 aw, and 16 degrees C and 35 degrees C. PME activities were significantly, higher at 4 and 8 months than in controls (2 degrees C, 0.30 aw,) and at 8 versus 4 months, irrespective of aw. Hardening increased with storage time, temperature and aw. Varieties showed significant hardness differences. PME activity influence on hardness was not clearly revealed during the 8 month storage period in the current study.
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