Moisture and Temperature Triggered Release of a Volatile Active Agent from Soy Protein Coated Paper: Effect of Glass Transition Phenomena on Carvacrol Diffusion Coefficient

Abstract

Carvacrol release from SPI-coated papers was evaluated at different relative humidities (RH; 60, 80, and 100%) and storage temperatures (5, 20, and 30 degrees C). Effective carvacrol diffusivities were determined from experimental release kinetics and by using a mathematical model based on Fick's second law. Increasing storage temperature and RH lead to an increase of carvacrol diffusivity. Depending on the relative humidity, the carvacrol effective diffusivity varied from 1.71 x 10(-16) to 138 x 10(-16) m(2)/s at 30 degrees C, from 0.85 x 10(-16) to 8.78 x 10(-16) m(2)/s at 20 degrees C, and from 0.11 x 10(-16) to 7.50 x 10(-16) m(2)/s at 5 degrees C. The combined effect of relative humidity and temperature on diffusivity was particularly marked at 30 degrees C and 100% RH. The temperature and relative humidity dependence of carvacrol release was related to the glass transition phenomenon and its effect on chain protein mobility and carvacrol diffusivity.

Anti-microbial effectiveness of relative humidity-controlled carvacrol release from wheat gluten/montmorillonite coated papers

“…The carvacrol diffusion within the paper was assumed to be non-rate limiting. Indeed, the diffusivity of carvacrol in the paper (5.9 10 À14 m 2 s À1 ; Chalier et al, 2009) was 15 times higher than that observed in the gluten layer at 30 C and 60% RH (0.38e0.71 10 À14 m 2 s À1 ). Even if some carvacrol were to diffuse into the paper layer, the equilibrium would be reached very quickly (the diffusion from paper toward atmosphere being impossible due to the contact with the support) and would not disturb carvacrol diffusion occurring in the protein layer ( Fig.…”

“…The mathematical model previously presented by Chalier et al (2009) was used to model the anti-microbial agent release from the coated paper toward atmosphere. This model was successfully applied by these authors on soy protein isolate coated paper and was thus used in this study, the main assumptions being the same:…”

“…In a previous study, anti-microbial coated papers, based on isolate soy protein or modified starch as coating matrix including carvacrol, were developed and their anti-microbial properties were demonstrated toward Escherichia coli and Botrytis cinerea (Ben Arfa, . Among the studied matrices, soy protein matrix offers the highest ability to retain carvacrol during paper processing and storage and exhibited an efficient release of carvacrol triggered by high RH (Chalier, Ben Arfa, Guillard, & Gontard, 2009). Retaining carvacrol in coated matrices and controlling its release characteristic is of major significance for processing and developing active packaging.…”

State of the Art in the Development and Properties of Protein-Based Films and Coatings and Their Applicability to Cellulose Based Products: An Extensive Review

“…When applied as coatings, more results deal with plastic coatings than with paper and board coatings. In consequence to this, the application on paper has been studied only for a few proteins such as whey proteins [8,9,32,33], isolated soy proteins [214,[278][279][280][281][282], caseinates [1,7,115,121], wheat gluten [32,280,[283][284][285] and corn zein [1,37,234,235]. As could be observed so far, the literature is countless and it is of course also expected that some of the results on standalone films and on coatings on different substrates can be transferred to paper at least as trends.…”

Antimicrobial packaging system for minimally processed fruit

“…In this regard, the release rate of the active agents from the packaging material is critical in order to maintain the content of a given preservative above the minimum inhibitory concentration during the desired food shelf life (Chalier et al, 2009).…”