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.
|Titolo:||Anti-microbial effectiveness of relative humidity-controlled carvacrol release from wheat gluten/montmorillonite coated papers|
MASCHERONI, ERIKA (Primo)
|Parole Chiave:||nti-microbial system ; Packaging ; Agropolymer ; Clay ; Carvacrol ; Diffusivity|
|Settore Scientifico Disciplinare:||Settore AGR/15 - Scienze e Tecnologie Alimentari|
|Data di pubblicazione:||ott-2011|
|Digital Object Identifier (DOI):||10.1016/j.foodcont.2011.03.014|
|Appare nelle tipologie:||01 - Articolo su periodico|