Starch gelatinization and in vitro digestibility behaviour after heat treatment: Comparison between plantain paste and piece of pulp. uri icon

abstract

  • Over the 65-100 degrees C range and at a water content of 1.6 kg kg(-1) db, a comparison was conducted between plantain paste (dispersion made of flour and water) and pulp pieces after cooking to evaluate their respective degree of starch gelatinization (alpha) and in vitro digestibility. Below 76 degrees C and at 100 degrees C, the gelatinization behaviour of starch into pulp pieces and paste was similar, whereas at 85 degrees C a significant mean relative difference was observed in between. For alpha in the 0-1 range, pieces of plantain pulp exhibited a lower rapidly digestible starch fraction (30%) and a higher resistant starch fraction (33%) than the flour paste, suggesting some structural effects. Both Weibull and exponential models showed a good fit for alpha over temperature range and starch digestibility fractions over alpha. Although no explicit relationship was established between the intact pulp structure and grinded flour state of plantain, the evaluation of the degree of starch gelatinization and digestibility of a plantain flour paste, could be used to predict the gelatinization and digestibility behaviour of plantain starch in entire pieces of pulp. (C) 2016 Elsevier Ltd. All rights reserved.

publication date

  • 2016
  • 2016