殼聚糖基累托石改性復(fù)合薄膜的制備及抑菌性能研究
[Abstract]:Chitosan (CS) has attracted much attention in recent years because of its wide range of sources, abundant reserves and excellent film-forming properties. Chitosan has excellent biocompatibility and biodegradability, so it has great advantages in the research of chitosan edible film. However, because of the different aim, the antibacterial ability of chitosan monofilm is not up to the requirement of bacteriostasis, and the mechanical property is not very high. These defects limit the development of chitosan monomembrane. Therefore, the antimicrobial properties of chitosan membranes are improved by adding other antimicrobial materials. Rectorite (REC) is a kind of natural layered silicate with special structure. Because of its unique lamellar structure, REC has a very large specific surface area, which leads to considerable adsorption performance and synergistic enhancement ability. In recent years, the main research on REC is to prepare intercalated composite materials by solution intercalation method, which has the properties of both materials and has been enhanced due to the existence of synergistic ability. The composite is an inorganic nanocomposite with excellent properties and wide application. Cellulose acetate (CA) is one of the cellulose derivatives with good biocompatibility and biodegradability. In recent years, CA has been widely used as a substitute for cellulose and used in textile, medical and other fields. With the development of material science, the research of nano-materials is increasing day by day. As a new technology of preparing nanofibers, electrostatic spinning technology has been widely used in various fields. CA, as a cellulose derivative, has also attracted much attention in the preparation of nanofibers. The main contents and conclusions of this study are as follows: 1. The natural antimicrobial lysozyme (LY) was blended with chitosan / rectorite (REC) solution, and the chitosan composite membrane was prepared by casting method. The morphology and structural characteristics of the composite membrane were observed by scanning electron microscope. It was found that the morphology of the composite film changed greatly with the addition of rectorite. The results of X-ray diffraction also showed that the interlayer spacing of REC in the composite film increased. Thermogravimetric analysis also showed that the thermal stability of the composite film was improved with the addition of rectorite. Finally, the bacteriostatic results showed that the addition of LY and REC enhanced the bacteriostatic properties of the composite membrane. 2. 2. Chitosan was decomposed into water-soluble chitosan oligosaccharide (COS),) with lower molecular weight, and different concentrations of COS solution and COS/REC solution were prepared. The chitosan was assembled on CA nanofiber film by spin-coating apparatus. The SEM results showed that the fiber surface was uniformly covered with chitosan oligosaccharide, and the coverage area increased with the increase of concentration, and after adding rectorite, The distribution of chitosan oligosaccharides on the fiber surface was uneven, and the phenomenon of increasing the interlaminar spacing of REC in CA nanofibers was also obtained by X-ray diffraction. The results of water contact angle show that the water contact angle of the film decreases obviously with the assembly of COS, and the water absorption of the film is enhanced by the addition of REC. The bacteriostasis results showed that the CA nanocomposite membrane had excellent antibacterial properties and met the requirements of packaging materials.
【學(xué)位授予單位】:廣西大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TB383.2
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