Extractant synergistic ultrasound extraction of pectin from banana peel and preparation of pectin composite films
Pectin was extracted from banana peels of bananas cultivated in Zhangzhou Tianbao area using a synergistic ultrasound extraction method with various extracting agents. Chitosan-pectin (CS-PEC) composite films were then prepared using chitosan (CS) and the extracted pectin (PEC) as film-forming materials,along with glycerol as a plasticizer and calcium chloride as a cross-linking agent. The effects of the chitosan-to-pectin blending ratio,glycerol concentration,calcium chloride concentration,and crosslinking time on mechanical properties,barrier properties,thermal sealing performance,and water resistance of the composite films were investigated. The results indicated that a combination of ethylenediaminetetraacetic acid (EDTA) and ultrasound was the most effective extraction method. The optimal preparation process for the CS-PEC composite film was:a chitosan-to-pectin ratio of 3︰1 (g/g),0.4％ glycerol,2％ calcium chloride,and a 5-minute crosslinking time. The CS-PEC composite film showed a peroxide value of 2.70 MEQ/kg,a water vapor transmission coefficient of 0.87 g·mm/m²·day·kPa,a tensile strength of 14.42 Mpa,an elongation at break of 11.3％,a heat sealing strength of 159 N/m,and a swelling degree of 38％. These results demonstrated that CS-PEC composite film had promising comprehensive properties.
chelating agentultrasoundbanana peelpectincomposite film
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