Study On The Preparation Of Nanopartcles Loaded Metal Form Polysaccharides Containing Carboxy Group And Characterization Of Their Structure And Properties

Cellulose chitosan and alga were typical natural macromolecule, which were abundant in nature. Polysaccharides had some excellent properties, such as nontoxicity,biocompatible, biodegradation. Now it was used widely in themedical materials, the food, and the textile. So it was hotspot for the functional modification and the application of the polysaccharides, which caught more attention in recent years.Most of polysaccharides were not soluble. Through modifying the polysaccharides hydroxyls group to carboxyl group, it could increase the soluble ability and the ability that loaded metal ion. In the experiments, the effect of physical properties, the ion concentration, the pH value, the temperature, the stirred speed had been studied and those parameters, influence was also investigated. Through FTIR, SEM, WAXD, some subjects were investigated for the polysaccharides loaded ion particles, such as the chemical structure, the morphology, and the antibacterial ability. The main results were obtained as follows:1 During the oxidizing reaction, the influence on the oxidizing reaction speed was investigated, such as the component weight ratio, the pH value and the morphology of polysaccharides. The molecular structure of oxidized material was characterized’ through FTIR, SEM, and WAXD. The results showed that C₆ hydroxyls of chitosan and cellulose group could be oxidized into carboxyl group in TEMPO—NaOCl—NaBr oxidation system, while C₂ and C₃ hydroxyls group were not oxidized at the same time. The full-oxidized chitosan and cellulose could be dissolved in water.2 The polysaccharides concentration, the silver ion concentration the pH value the temperature and the stirring speed were investigated, which influenced the morphology and the silver content that polysaccharides loaded. The molecular structure and the morphology of particles were characterized through FTIR and SEM. When polysaccharides concentration was 0.1-0.2% and the silver ion concentration was 5-25mmol/l and the pH value was 3-6, the results show that the diameter of particles was 13-496nm.3 The physical properties, the polysaccharides concentration, the copper ion concentration the pH value the temperature were investigated, which influenced the morphology and the content for the carboxyl methyl chitosan, the oxidized chitosan loaded copper particles. The molecular structure, the morphology and the antibacterial ability had been studied with FTIR, SEM, WAXD. When the polysaccharides concentration was 0.1-0.2% and the copper ion concentration was 25-73mmol/l and the pH value was 3-6 and the temperature was 15-40°C, the diameter of particles was about 13-800nm. The antibacterial ability of polysaccharides loaded copper ion had been improved greatly. The antibacterial ability reached as 99%. Especially, when CMCS concentration was 0.1266% the copper ion concentration was 73mmol/l the pH value was 4.56 and the temperature was 25℃, CMCS loaded copper particles was hollow.4 The physical properties, the polysaccharides concentration, the copper ion concentration the pH value the temperature were investigated, which influenced the morphology and the content of the alga and the oxidized cellulose and the carboxyl methyl cellulose loaded copper particles. The molecular structure, the morphology and the antibacterial ability had been studied with FTIR, SEM, WAXD. When the polysaccharides concentration was 0.2-0.4% and the copper ion concentration was 50mmol/l and the pH value was 3.5-5.5 and the temperature was 15-40°C, the diameter of particles was 56-382 nm. The antibacterial ability of polysaccharides loaded copper ion had been improved. The antibacterial ability reached as 99%.