4.7 Article

Relationship between the kinetics of β-carotene degradation and formation of norisoprenoids in the storage of dried sweet potato chips

Journal

FOOD CHEMISTRY
Volume 121, Issue 2, Pages 348-357

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2009.12.035

Keywords

Carotenoids; Dried sweet potato; Ipomoea batatas L.; Kinetics; Norisoprenoids; Oxygen; Storage; Temperature; Volatile compounds; Water activity

Funding

  1. HarvestPlus Challenge Program
  2. CIRAD, France

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The effects of storage temperature (10; 20; 30; 40 degrees C), water activity (0.13; 0.30; 0.51; 0.76) and oxygen level (0%; 2.5%; 10%; 21%) on the degradation of carotenoids and formation of volatile compounds during storage of dried sweet potato chips were evaluated. A kinetic model was developed for degradation of trans-beta-carotene and it showed that breakdown followed first order kinetics with an activation energy of 64.2 kJ mol(-1). The difference between experimental data under laboratory or field conditions fitted and data predicted by the model was less than 10% for trans-beta-carotene, or for total carotenoids. The formation of the volatile compounds, beta-ionone; 5,6-epoxy-beta-ionone; dihydroactinidiolide; beta-cyclocitral, was measured by SPME-GC-MS and was clearly related to the degradation of trans-beta-carotene. It is also suggested that carotenoid degradation in dried sweet potato was by autoxidation because of the trend in beta-carotene degradation rate in relation to water activity or oxygen level. (C) 2009 Elsevier Ltd. All rights reserved.

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