Characterization of carnauba wax-chitosan film and its application on grape preservation
To investigate the effect of carnauba wax on the physical and functional properties of chitosan film,carnauba wax was added to the acetic acid solution containing 1 g/100 mL chitosan to prepare the composite film solutions with different concentrations(0.1,0.2,0.3,0.4,0.5 g/100 mL).Meanwhile,the film prepared from chitosan film solution without carnauba wax was used as the control group.The results showed that compared with the control group,the mechanical properties,optical barrier properties,hydrophobic properties and thermal stability of the composite films were significantly improved with the increase of carnauba wax content,which may be associated with the hydrophobicity of carnauba wax and its hydrogen bond and electrostatic interaction with chitosan molecules.When the content of carnauba wax was 0.3 g/100 mL,the composite film had good physical properties,with tensile strength of 10.64 MPa,elongation at break of 83.80％,and contact angle of 68°.In addition,carnauba wax-chitosan composite coating could decrease the decay and weight loss rate of'Jufeng'grapes,thereby maintaining its postharvest quality and prolonging its shelf life.Therefore,the addition of carnauba wax is conducive to improve the applicability of chitosan film as edible film.
natural waxedible filmtensile strengthelongation at breakgrape preservation
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