Dissertation > Excellent graduate degree dissertation topics show

Research of Making the Carboxymethyl Chitosan/Nano Materials Composite Film

Author: LvJiaMeiYue
Tutor: NiuRongLi
School: Huaqiao University
Course: Biochemistry and Molecular Biology
Keywords: carboxymethyl chitosan nano materials composite filmpreservation
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 118
Quote: 0
Read: Download Dissertation

Abstract


With the exaltation of the life level, the consumers like the high quality, nutrientand fresh food more and more. In this text, Carboxymethyl chitosan and SiO2/ZnOwere composited to make two new kinds of preservative films which were green andedible. Then, obtained the most appropriate process parameters of making films;comparative analyzed the differences among Carboxymethyl chitosan film,Carboxymethyl chitosan/SiO2composite film and Carboxymethyl chitosan/ZnOcomposite film in mechanical properties and permeance properties of water vapor. Atlast, the films was used to pack fruits,and its preservative effects was studied.Part1: Preparation of Carboxymethyl chitosan.Carboxymethyl chitosan was successfully prepared by using laboratory-madechitosan, which was preliminarily verified by infrared spectroscopy. Its averagemolecular weight was2.48×105, and the degree of carboxylation was82%.Part2: Preparation and microstructure characterization of Carboxymethyl chitosan/nano materials composite film.Taking the Permeation rate of water and elongation at break as objective function,the uniform experimental design methods were used for investigation, obtaining twooptimal formula of Carboxymethyl chitosan/nano materials composite films. Theresults indicated that the optimum process conditions was obtained, as follows: theratio of Carboxymethyl chitosan, nano SiO2and glycerol was1.125:0.055:0.775, andthe ratio of Carboxymethyl chitosan, nano ZnO and glycerol was1.625:0.055:0.775.In addition, Characteristics of the composite films were studied by X-raydiffraction(XRD), scanning electron microscopy(SEM) and energy dispersive X-rayfluorescence spectrometry(EDX). The results revealed that both of the two kinds ofnanoparticles dispersed homogeneously within the carboxymethyl chitosan matrix.Part3: Differences between Carboxymethyl chitosan film, Carboxymethylchitosan/SiO2composite film and Carboxymethyl chitosan/ZnO composite film inantibacterial property.Carboxymethyl chitosan film, Carboxymethyl chitosan/SiO2composite film andCarboxymethyl chitosan/ZnO composite film was tested qualitatively andquantitatively by an inhibition zone method and a viable cell count method,respectively. Antibacterial experimental results show that Carboxymethylchitosan-based nanocomposite films, especially ZnO-containing ones, showed apromising range of antimicrobial activity. Part4: Differences between Carboxymethyl chitosan film, Carboxymethylchitosan/SiO2composite film and Carboxymethyl chitosan/ZnO composite film inkeeping fresh properties.The result showed that: the effect of Carboxymethyl chitosan/SiO2composite filmand Carboxymethyl chitosan/ZnO composite film were close and Carboxymethylchitosan/ZnO composite film’s was a little better. Used Carboxymethyl chitosan film,Carboxymethyl chitosan/SiO2composite film and Carboxymethyl chitosan/ZnOcomposite film to pack Strawberry and Winter Jujube can keep them fresh5days and10days under ambient temperature, respectively. It was significant to extend the shelflife. The preservation effect of Carboxymethyl chitosan/nano materials compositefilm is better than Carboxymethyl chitosan film, and the sensory evaluation and theretention of nutrients were similar to the PE film.

Related Dissertations

  1. Studies on Chitosan and Its Derivatives Adsorption for Paralytic Shellfish Poisoning in Ostrea Rivularis Could,TS254.4
  2. Study on the Accumulation and Remove of Cadmium and Lead in Oysters,X174
  3. Bovine serum albumin and protamine from NOCC / alginate hydrogels release : the isoelectric point of two different biological molecules controlled trial,R943
  4. Synthesis, In-situ Mechanical and Electrical Properties of One-dimentional Carbide Nano-materials Generated from Plant Fibers,TB383.1
  5. Studies on the Preparation of Carboxymethyl Chitosan and Its Sulfonation,O636.1
  6. Effects of Carboxymethyl-chitosan on Wound Healing,R644
  7. Solvothermal Synthesis and Properties of Three-Dimensional Ordered Nihpo3 ·H2 O/Cu3 V2O （OH）2 ·2H2O Micro/Nanomaterials,TB383.1
  8. Synthesis, Characterization and Applications of Magnetic Composite Nano-materials,TB383.1
  9. Research on Crosslinked Polyphosphazene Micro- & Nano-Structured Materials,TB383.1
  10. Preparation and Properties of Polyurethane Foam Modified by Inorganic Nanoparticles,TB383.1
  11. Study on Novel Enzyme Biosensors Based on Nano Materials and Their Applications in Biological Analysis,TP212.3
  12. Preparation and Properties of Starch Nanocrystals/Natural Polymer Composite Films,TB383.2
  13. Study on Assembly and Performance of Polymer/LDH Nano-Composite Material with Supermolcular Structure,TB383.1
  14. Bola type histidine - based surfactants (H_2D) of its complex system of gas / liquid interface adsorption,O647.3
  15. Surfactant system , cobalt, nickel magnetic micro and nano Preparation and Properties of Materials,TB383.1
  16. Effects of Carboxymethyl Chitosan on the Growth of Tumor Cells and Tumor Tissue,R96
  17. Modification of Chitosan & Carboxymethyl Chitosan Grafted with Monomethoxy Poly(Ethylene Glycol),TQ316.6
  18. Study on Tat Mediated Magnetic Nanoparticles Having Composite Targeting Function,TB39
  19. Sintering of Ti-47Al-xAl2O3-yCr Nano-powder by Mechanical Activating-Spark Plasma Sintering,TB383.1
  20. Preparation and Biological Evaluation of Carboxymethyl Chitosan,R318.08
  21. Studies on Preparation, Properties and Applications of Carboxymethyl Chitosan and Its Derivatives,X703.5

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile