Incorporation of bentonite clay in cassava starch films for the reduction of water vapor permeability

Abstract

Complete factorial planning 2 was applied to identify the influence of the cassava starch(A), glycerol(B) and modified clay(C) content on the water vapor permeability(WVP) of the cassava starch films with the addition of bentonite clay as a filler, its surface was modified by ion exchange from cetyltrimethyl ammonium bromide. The films were characterized by X-ray diffraction(XRD), fourier transform by infrared radiation(FTIR), atomic force microscopy(AFM) and scanning electron microscopy(SEM). The factorial analysis suggested a mathematical model thats predicting the optimal condition of the minimization of WVP. The influence of each individual factor and interaction in the WVP was investigated by Pareto graph, response surface and the optimization was established by the desirability function. The sequence of the degree of statistical significance of the investigated effects on the WVP observed in the Pareto graph was C>B>A>BC>AC. Interactions AB, BC and AC showed that the modified clay was the factor of greater significance.

Montmorillonite as a reinforcement and color stabilizer of gelatin films containing acerola juice

“…This decreasing effect of Mt on WVP of films has been observed in other studies (Romero-Bastida et al, 2015;Oliveira et al, 2016), and is ascribed to the so-called tortuous path effect, i.e. an increased diffusion path length for permeants such as water vapor through the matrix due to obstacles created by the presence of impervious particles (Tan and Thomas, 2017;Monteiro et al, 2018).…”

Effect of Clay Nanofillers on the Mechanical and Water Vapor Permeability Properties of Xylan–Alginate Films

“…Similar results were reported by Lee et al who noted that the addition of 30 wt % halloysite to chitosan films resulted in a decrease of WVP by 14.18% [ 29 ]. A study by Monteriro et al indicated that the incorporation of bentonite into cassava starch resulted in a decrease of the WVP of the films [ 64 ].…”

Comparative study on properties of starch films obtained from potato, corn and wheat using 1-ethyl-3-methylimidazolium acetate as plasticizer

“…Atomic Force Microscopy (AFM)In order to further understand the morphology of the starch films synthesized, a topographic study made by AFM to obtain qualitative (morphology) and quantitative (roughness) information of the different samples, based on the atomic interaction of their constituents[53]. Tri-and bidimensional topographic AFM images and bi-dimensional contrast phase images are presented in…”