Publication :
Low-temperature blanching as a tool to modulate the structure of pectin in blueberry purees

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Date
2017-08-10
Direction de publication
Direction de recherche
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Titre du volume
Éditeur
Journal of food science
Projets de recherche
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Numéro de revue
Résumé
Blueberry composition was characterized for 6 cultivars. It contains a good amount of dietary fiber (10% to 20%) and pectin (4% to 7%) whose degree of methylation (DM) is sensitive to food processing. A low temperature blanching (LTB: 60 °C/1 h) was applied on blueberry purees to decrease pectin DM, in order to modulate puree properties and functionalities (that is, viscosity and stability), and to enhance pectin affinity toward other components within food matrices. Fiber content, viscosity, pectin solubility, DM, and monosaccharide composition were determined for both pasteurized, and LTB+pasteurized blueberry purees. The results showed that neither the amount of fiber, nor the viscosity were affected by LTB, indicating that this treatment did not result in any significant pectin depolymerization and degradation. LTB caused a decrease both in pectin DM from 58–67% to 45–47% and in the amount of water-soluble pectin fraction, the latter remaining the major fraction of total pectin at 52% to 57%. A LTB is a simple and mild process to produce blueberry purees with mostly soluble and low-methylated pectin in order to extend functionality and opportunities for interactions with other food ingredients.
Description
Revue
Journal of food science, 82(9), 2070-2077 (2017)
DOI
10.1111/1750-3841.13826
URL vers la version publiée
Mots-clés
Blueberry , Fiber , Pectin , Low-temperature blanching , Degree of methylation.
Citation
Type de document
article de recherche