Preparation and characterization of chitosan/HP-β-cyclodextrins composites with high sorption capacity for carvacrol

• Published in: Carbohydrate polymers Vol. 97; no. 2; pp. 262 - 268
• Main Authors: Higueras, Laura, López-Carballo, Gracia, Cerisuelo, Josep P., Gavara, Rafael, Hernández-Muñoz, Pilar
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 12.09.2013; Elsevier
• Subjects: 2-Hydroxypropyl-beta-cyclodextrin; Adsorption; Applied sciences; beta-Cyclodextrins - chemical synthesis; beta-Cyclodextrins - chemistry; Biocomposite; biocomposites; carvacrol; Chitosan; Chitosan - chemical synthesis; Chitosan - chemistry; Elastic Modulus; Exact sciences and technology; Forms of application and semi-finished materials; Functional properties; glycerol; humidity; Hydroxypropyl-β-cyclodextrins; mechanical properties; Monoterpenes - isolation & purification; Optical Phenomena; Oxygen - chemistry; Permeability; Polymer industry, paints, wood; polymers; Sheets and films; sorption; Sorption of carvacrol; Steam; Technology of polymers; Temperature; Tensile Strength; Thermogravimetry; Functional properties; Hydroxypropyl-β-cyclodextrins; Sorption of carvacrol; Chitosan; Biocomposite; Composite film; Transparency; Transport properties; Color; Glycerol; Mechanical properties; Experimental study; Thermal stability; Gas permeability; Cyclodextrin; Steam permeability; Humidity effect; Binding capacity; Plasticizer; Optical properties; Phenols; Oside polymer; Essential oil; Sorbent
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2013.04.007

•Films with adjustable loading capacity of carvacrol have been developed.•HP-β-cyclodextrins enhanced sorption of carvacrol by chitosan films.•Sorption properties of films depended on plasticization by glycerol and moisture.•HP-β-cyclodextrins improved mechanical resistance and water vapour barrier properties of films.•HP-β-cyclodextrins delayed thermal degradation of chitosan films. The aim of this work was to design new polymer-based systems exhibiting an adjustable loading capacity of carvacrol depending on the film formulation. For this purpose, biocomposite films were developed employing chitosan (CS) as the polymer matrix and hydroxypropyl-β-cyclodextrins (HP-βCDs) as an adjuvant to improve the sorption of carvacrol in the polymer matrix. The morphology, optical, mechanical and barrier properties of the resulting films were investigated, and the sorption capacity of carvacrol evaluated. Biocomposites resulted highly transparent with higher mechanical resistance and moisture barrier properties. Sorption of carvacrol was greatly affected by the humidity (RH) and glycerol (G) content of the biocomposites. The highest sorption values were achieved for composites incorporating 35% glycerol and conditioned at 75% these composites retained 216% carvacrol (g/100g dry matter). These results indicate that inclusion of carvacrol in the films could be occurring by mechanisms other than formation of inclusion complexes.