Complexation of methyl salicylate with ß-cyclodextrin and its release characteristics for active food packaging.

A series of methyl salicylate (MeSA)/ß-cyclodextrin (ß-CD) inclusion complexes (ICs) were prepared at different MeSA concentrations by the co-precipitation method using methyl salicylate for maintaining the quality of fresh produce. The formation of IC was confirmed through FTIR, 1H NMR, TGA, and SEM measurements. Among the grades applied, IC with 1:1 grade showed the highest MeSA entrapment efficiency (59%). The release rate of MeSA from an IC was greater at higher temperature and higher relative humidity. In addition, the MeSA release from ICs of all grades followed a diffusive nature and first-order kinetics at 25 °C under all RH conditions, except at 7 °C. These results indicate that the use of a MeSA/ß-CD IC in active packaging applications can effective maintain the quality of fresh produce.

Synthesis, characterization and applications of polymethylmethacrylate grafted psyllium as flocculant.

Polymethylmethacrylate grafted psyllium (Psy-g-PMMA) was synthesized by microwave assisted method. The grafting of the PMMA chains on the psyllium backbone was confirmed through the study of intrinsic viscosity, FTIR spectroscopy, elemental analysis, SEM and number average molecular weight (Mn). The intrinsic viscosity and number average molecular weight (Mn) of psyllium appreciably improved on grafting of PMMA chains. Further, flocculation efficacy of the graft copolymer was studied in kaolin suspension through jar test procedure, towards possible application as flocculant.