A new way of valorizing biomaterials: the use of sunflower protein for 1 a-tocopherol microencapsulation

Alla Nesterenko (1) , Isabelle Alric (1) , Frédéric Violleau (2) , Françoise Silvestre (1) , Vanessa Durrieu (1)

1 CAI - Chimie Agro-Industrielle
2 Toulouse INP - Institut National Polytechnique (Toulouse)

Biopolymer based microparticles were efficiently prepared from sunflower protein (SP) wall material and a-tocopherol (T) active core using a spray-drying technique. Protein enzymatic hydrolysis and/or N-acylation were carried out to make some structural modifications to the vegetable protein. Native and hydrolyzed SP were characterized by Asymmetrical Flow Field-Flow Fractionation (AsFlFFF). Results of AsFlFFF confirmed that size of proteinic macromolecules was influenced by degree of hydrolysis. The effect of protein modifications and the influence of wall/core ratio on both emulsions and microparticle properties were evaluated. Concerning emulsion properties, enzymatic hydrolysis involved a decrease in viscosity, whereas acylation did not significantly affect emulsion droplet size and viscosity. Microparticles obtained with hydrolyzed SP wall material showed lower retention efficiency (RE) than native SP microparticles (62-80% and 93% respectively). Conversely, acylation of both hydrolyzed SP and native SP allowed a higher RE to be reached (up to 100%). Increasing T concentration increased emulsion viscosity, emulsion droplet size, microparticle size, and enhanced RE. These results demonstrated the feasibility of high loaded (up to 79.2% T) microparticles.

Mots clés: Sunflower protein; A-tocopherol; Enzymatic hydrolysis; N-acylation; Microencapsulation; Spray-drying

Domaines: Biotechnologies; Biotechnologie; Matériaux

Alla Nesterenko, Isabelle Alric, Frédéric Violleau, Françoise Silvestre, Vanessa Durrieu. A new way of valorizing biomaterials: the use of sunflower protein for 1 a-tocopherol microencapsulation. Food Research International, 2013, vol. 53 (1), pp. 115-124. ⟨10.1016/j.foodres.2013.04.020⟩. ⟨hal-00868071⟩