In this study, the low methoxyl pectin-carboxymethyl cellulose-based montmorillonite (LMP-CMC-MMT, LCM) nanocomposite films with nine ratios of LMP:CMC (from 10:0 to 0:10) and different MMT contents (1-8 wt%) were prepared. The mechanical properties, colour, opacity and water vapour permeability (WVP) of composite films were investigated. The maximum of tensile strength (TS) of composite films was 39.85 AE 2.51 MPa at LMP:CMC ratio of 4:6 and 4 wt% MMT (LCM47), which indicated the formation of hydrogen bonds between MMT and LMP-CMC. The reduction of WVP of the LCM47 composite film was 333% of that of the CMC film due to the tortuous path caused by MMT incorporation. LCM composite films had the higher b*-and DE*-values and lower L*-values in comparison with LMP-CMC (LC) composite films. The LCM composite films showed a decrease in transparency as MMT content increased.

The aim of this study was to evaluate the kinetics of potassium sorbate (PS) loaded in low methoxyl pectin/carboxymethyl cellulose (PS-LMP/CMC) films into 95% ethanol. The ratio of LMP and CMC was changed from 8:2 to 0:10 by modulating the composition of the initial casting solution, and the corresponding diffusion coefficients were obtained from 0.26 3 10 212 to 2.11 3 10 212 cm 2 /s and showed a good linear relationship with the ratio of CMC in LMP/CMC films. The diffusivity and partition coefficient were increased with the increasing of CMC content. A decrease in temperature from 60C to 4C resulted in a reduction of diffusion coefficients from 3.11 3 10 212 to 0.93 3 10 212 cm 2 /s. The activation energy for the diffusion of PS in LMP/CMC (4:6) film was 16.42 kJ/mol. The release experiment at 15C showed that it is reliable to predicted release profile of PS from LMP/CMC (4:6) film according to the Fickian model.

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