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Influence of soy protein’s structural modifications on their microencapsulation properties: a-tocopherol microparticles preparation

Nesterenko, Alla and Alric, Isabelle and Silvestre, Françoise and Durrieu, Vanessa Influence of soy protein’s structural modifications on their microencapsulation properties: a-tocopherol microparticles preparation. (2012) Food Research International, 48 (2). 387-396. ISSN 0963-9969

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Official URL: http://dx.doi.org/10.1016/j.foodres.2012.04.023


Enzymatic and chemical modifications of soy protein isolate (SPI) were studied in order to improve SPI properties for their use as wall material for a-tocopherol microencapsulation by spray-drying. The structural modifications of SPI by enzymatic hydrolysis and/or N-acylation were carried out in aqueous media without any use of organic solvent neither surfactant. Emulsions from aqueous solutions of native or modified SPI and hydrophobic a-tocopherol, were prepared and spray-dried to produce a-tocopherol microparticles. The effect of protein modifications and the influence of the core/shell ratio on both emulsions and microparticles properties were characterised. The obtained results demonstrated that oil-in-water emulsions prepared with modified proteins had lower droplet size (0.5-0.9 μm) and viscosity (3.6-14.8 mPa×s) compared to those prepared with native proteins (1.1 μm and 15.0 mPa×s respectively). Efficiency of oil retention decreased after protein hydrolysis from 79.7 to 38.9%, but the grafting of hydrophobic chain by acylation improved efficiency of a-tocopherol retention up to 94.8%. Moreover, higher emulsion viscosity, particle size and process efficiency were observed with the increase of a-tocopherol amount.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://dx.doi.org/10.1016/j.foodres.2012.04.023
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Laboratory name:
Laboratoire de Chimie Agro-Industrielle - LCA (Toulouse, France) - Fractionnement et transformation des agroressources
Laboratoire de Chimie Agro-Industrielle - LCA (Toulouse, France) - Lipochimie et Réactivité Chimique des Agromolécules
Deposited On:16 Nov 2012 10:29

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