Microencapsulation of Chia Seed Oil (Salvia hispanica L.) in Spray and Freeze-Dried Whey Protein Concentrate/Soy Protein Isolate/Gum Arabic (WPC/SPI/GA) Matrices

• Published in: Proceedings Vol. 53; no. 1; p. 22
• Main Authors: María Gabriela Bordón, Gabriela Noel Barrera, Maria C. Penci, Andrea Bori, Victoria Caballero, Pablo Ribotta, Marcela Lilian Martínez
• Format: Journal Article
• Language: English
• Published: MDPI AG 01-09-2020
• Subjects: chia seed oil; complex coacervation; freeze and spray drying; microencapsulation; oxidative stability; ternary wall material blend
• ISSN: 2504-3900
• DOI: 10.3390/proceedings2020053022

Microencapsulation by different drying methods protects chia seed oil (CSO) against oxidative degradation, and ultimately facilitates its incorporation in certain foods. The aim of this work was to analyze the influence of freeze or spray drying, as well as of the coacervation phenomena in a ternary wall material blend—whey protein concentrate/soy protein isolate/gum arabic (WPC/SPI/GA)—on the physico–chemical properties of microencapsulated CSO. Differential scanning calorimetry studies indicated that the onset, peak, and end set temperatures for denaturation events shifted from 72.59, 77.96, and 78.02 to 81.34, 86.01, and 92.58 °C, respectively, in the ternary blend after coacervation. Oxidative stability indexes (OSI) of powders were significantly higher (p < 0.05) for both drying methods after inducing coacervation—from 6.45 to 12.04 h (freeze-drying) and 12.05 to 15.31 h (spray drying)—which was possibly due to the shifted denaturation temperatures after biopolymer interaction. It can be concluded that the ternary WPC/SPI/GA blend constitutes an adequate matrix to encapsulate CSO.