Edible coatings,as carriers of antimicrobial compounds,have been proposed as an alternative method to preserve fresh-cut products.This research focused to improve the shelf life of fresh-cut rose apples by applying an...Edible coatings,as carriers of antimicrobial compounds,have been proposed as an alternative method to preserve fresh-cut products.This research focused to improve the shelf life of fresh-cut rose apples by applying an edible coating based on alginate cross-linked with calcium chloride(SAC)-enriched hexyl acetate(HA)as a natural antimicrobial compound.The SAC with HA in 0.01,0.03,and 0.05%(v/v)(SAC-HA)solution was evaluated for its film properties and applied to fresh-cut rose apples,and compared with the unmodified SAC coating.Postharvest quality and microbial contamination were determined every 2 days during 10 days of storage at 4℃.The film thickness,tensile strength,and elongation at break increased with the high concentrations of HA added.Films containing 0.03%HA had lower oxygen permeability(from 1.57 to 0.04×10^(-7) cm^(3)μm m^(-2) day^(-1) kPa^(-1)),as well as water vapor permeability(from 0.03 to 0.01 g mm m^(-2) day^(-1) kPa^(-1)),compared to the unmodified SAC film.Moreover,the greater coating uniformity and thickness were supported by scanning electron microscopy and Fourier transform infrared spectroscopy.The developed edible SAC coatings with 0.03%HA successfully preserved the physicochemical quality and extended the shelf life of fresh-cut rose apples for 10 days at 4℃ by retarding the respiration rate,inhibiting browning,and preventing microbial growth.Therefore,the using of SAC-HA in fresh-cut products is a promising and safe preservation technique to extend shelf life.展开更多
文摘Edible coatings,as carriers of antimicrobial compounds,have been proposed as an alternative method to preserve fresh-cut products.This research focused to improve the shelf life of fresh-cut rose apples by applying an edible coating based on alginate cross-linked with calcium chloride(SAC)-enriched hexyl acetate(HA)as a natural antimicrobial compound.The SAC with HA in 0.01,0.03,and 0.05%(v/v)(SAC-HA)solution was evaluated for its film properties and applied to fresh-cut rose apples,and compared with the unmodified SAC coating.Postharvest quality and microbial contamination were determined every 2 days during 10 days of storage at 4℃.The film thickness,tensile strength,and elongation at break increased with the high concentrations of HA added.Films containing 0.03%HA had lower oxygen permeability(from 1.57 to 0.04×10^(-7) cm^(3)μm m^(-2) day^(-1) kPa^(-1)),as well as water vapor permeability(from 0.03 to 0.01 g mm m^(-2) day^(-1) kPa^(-1)),compared to the unmodified SAC film.Moreover,the greater coating uniformity and thickness were supported by scanning electron microscopy and Fourier transform infrared spectroscopy.The developed edible SAC coatings with 0.03%HA successfully preserved the physicochemical quality and extended the shelf life of fresh-cut rose apples for 10 days at 4℃ by retarding the respiration rate,inhibiting browning,and preventing microbial growth.Therefore,the using of SAC-HA in fresh-cut products is a promising and safe preservation technique to extend shelf life.
