Encapsulation of ascorbic acid into calcium alginate matrices through coacervation coupled to freeze-drying

 

R. Viveros-Contreras, D.I. Téllez-Medina, M.J. Perea-Flores, L. Alamilla-Beltrán, M. Cornejo-Mazón, C.I. Beristain-Guevara, E. Azuara-Nieto and G.F. Gutiérrez-López

 

 

  • Method for assessing stability of ascorbic acid (AA) by encapsulation by coacervation into calcium alginate matrixes.

  • Reporting coacervation by: falling drop and atomizing methods, followed by freeze-drying.

  • Reporting sorption isotherms for both types of products at 15, 25 and 35 °C.

  • The minimum integral entropy of water at aw = 0.234 in the falling drop powders, and at aw = 0.706 for the atomised one.

  • For both products, the maximum value of AA retention was at the aw corresponding to the minimum integral entropy.