Coating papers with soy protein isolates as inclusion matrix of carvacrol

• Published in: Food research international 2007, Vol.40 (1), p.22-32
• Main Authors: Arfa, Afef Ben, Chrakabandhu, Yasinee, Preziosi-Belloy, Laurence, Chalier, Pascale, Gontard, Nathalie
• Format: Article
• Language: English
• Subjects: Antimicrobial; antimicrobial properties; biodegradability; Carvacrol; Chemical and Process Engineering; Chemical Sciences; Coating; coatings; drying; drying temperature; Engineering Sciences; food packaging; Material chemistry; packaging materials; protein aggregates; protein isolates; scanning electron microscopy; soy protein; Soy proteins; Viscosity; volatile organic compounds; water content
• ISSN: 0963-9969; 1873-7145
• DOI: 10.1016/j.foodres.2006.07.011

Antimicrobial papers were prepared by coating paper with soy protein isolate (SPI) solution as inclusion matrix of carvacrol, an antimicrobial agent. Addition of carvacrol (30% w/w of SPI) to SPI solution (10% w/v) prepared at 25 °C induced soy protein aggregates and viscosity decrease. Heat treatment (50, 70, 90 °C) of SPI solutions and carvacrol addition improved homogeneity reduced particles size and increased viscosity of solutions. The aggregated structure of SPI in the presence of carvacrol at 25 °C may play the role of a trapping structure leading to low carvacrol losses during coating and drying process of paper (9.6% against 37% after heat treatment at 90 °C) and to lower release rates specially the first three days (0.04 g/m 2/day and 0.31 g/m 2/day when SPI coating solutions were prepared at 25 and 90 °C, respectively). Regardless of the heat treatments received by the SPI solutions, residual carvacrol quantities in the coated papers after 50 days ranged between 0.6 and 0.7 g/m 2.