Anti-microbial effectiveness of relative humidity-controlled carvacrol release from wheat gluten/montmorillonite coated papers
Wheat gluten coated papers containing carvacrol (15wt%) as anti-microbial agent and montmorillonite (0-7wt%) as filler were investigated as anti-microbial controlled delivery systems. The carvacrol losses were followed during the coating process and storage time at 30∞C under controlled RH from 40 t...
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Published in | Food control Vol. 22; no. 10; pp. 1582 - 1591 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.10.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Wheat gluten coated papers containing carvacrol (15wt%) as anti-microbial agent and montmorillonite (0-7wt%) as filler were investigated as anti-microbial controlled delivery systems. The carvacrol losses were followed during the coating process and storage time at 30∞C under controlled RH from 40 to 100% RH. Increasing MMT content limited carvacrol losses during the coating process. A mathematical model based on Fick’s second law was used to determine the apparent diffusivities of carvacrol from experimental data of kinetic release at 30∞C and controlled RH. Diffusivity values varied from 0.143 × 10−14 m2/s (0wt% MMT, 40% RH) to 6.010 × 10−14 m2/s (5wt% MMT, 100%RH) depending on both MMT% and RH. The carvacrol diffusivities increased with increasing RH, and the presence of a high amount of MMT (≥5wt%) accentuated the RH-induced effect. Specific aggregated structure was evidenced by SEM and TEM in the presence of carvacrol and 5wt% MMT creating a preferential pathway for carvacrol diffusion. The anti-microbial efficiency of the MMT-WG-coated papers toward Escherichia Coli was assessed and showed that the anti-microbial effect was related to the carvacrol diffusivity. The diffusivity coefficients were utilized to optimize the packaging characteristics required to develop an efficient anti-microbial system and were finally validated against Botrytis cinerea. |
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ISSN: | 0956-7135 1873-7129 |
DOI: | 10.1016/j.foodcont.2011.03.014 |