Bài báo khoa học

In this paper, the chitosan-silver nanocomposite film was synthesized by green chemistry method, with selective gas permeability, containing safe antibacterial agent to increase the storage time of plum (Prunus Salicina) has been studied. The ethanol extract of Cleistocalyx Operculatus leaves was used to reduce silver ions in acidic solutions of AgNO 3 and chitosan. The formation of silver nanoparticles with small size of 10 - 20 nm distributed on chitosan films was determined by transmission electron microscopy (TEM) and UV-Vis spectroscopy. Preparation of film forming suspension from 1% chitosan solution and silver nanoparticle solution in ethanol extract of Cleistocalyx Operculatus leaves with different volume ratios by magnetic stirrer combined with heating. After cleaning, plums were dipped in film-forming suspensions for 30 seconds. The results show that the quality of coated plums is stable and the shelf life is higher than that of the control sample (without the film forming treatment). The chitosan-silver nanocomposite film forming system was mixed in a volume ratio of 3:1 for the best results, plums were stored for 12 days at room temperature. This approach can easily be used in large-scale production of chitosan biofilms containing silver nanoparticles.