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Synthesis, Properties and Application of Magnetic Starch

Author: WangYanLi
Tutor: LiuZhongDong
School: Henan University of Technology
Course: Of Food Science
Keywords: Starch Magnetic starch Mass susceptibility Immobilized enzyme
CLC: O636.12
Type: Master's thesis
Year: 2009
Downloads: 117
Quote: 0
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Abstract


Oxidation magnetization ordinary corn starch and waxy corn starch as raw material, the adsorption and embedded Fe304 magnetic particles, prepared magnetic starch. Exploration and analysis of of magnetic starch synthesis and its influencing factors, research and analysis part of their nature, structure and magnetic properties. Select the amount of ferrous chloride the starch dosage, pH, temperature factors, as an indicator to the quality of the magnetic susceptibility and particle size, single-factor test. And on this basis, to select waxy corn starch as raw material, experimental design and analysis of the response surface. The results show that the magnetic waxy corn starch synthesis conditions: the amount of ferrous chloride 20.4g, starch dosage of 14.3g, pH11.2, temperature 70 ° C; order of the size of the impact of various factors on the magnetic mass susceptibility of waxy corn starch as: the amount of ferrous chloride gt; the pH gt; starch dosage gt; temperature. There is some interaction between the amount of ferrous chloride, and the temperature, the amount of starch, and temperature, pH and temperature, the amount of starch and pH; interaction between the amount of ferrous chloride and the amount of starch, the amount of ferrous chloride and pH obvious. The experiment on the magnetic mass susceptibility of the starch χm, particle size, infrared spectra, magnetic domain structure, crystalline structure, surface structure and morphology, thermal stability and other properties were determined and analyzed. Waxy corn starch of experimentally measured magnetic mass susceptibility χm GT; 0 magnetic waxy corn starch is paramagnetic substance; magnetic force microscope to observe the magnetic waxy maize starch samples prepared under optimum conditions, filled with a homogeneous distribution of the particulate or stripe magnetic domain; infrared absorption spectrum of scans, magnetic waxy corn starch appeared the the Fe304 crystal characteristic absorption peak, the surface of the magnetic starch rich in hydroxy and carboxy; the X-ray diffraction showed that, magnetic after denaturation, waxy corn starch peak diffraction characteristics weakened and Fe304 crystal diffraction spikes; scanning electron microscopy revealed that the magnetic degeneration, waxy corn starch surface structure has greatly changed, but the particle morphology remained unchanged, or round and polygonal main; particle size analysis results show that the magnetic degeneration, waxy corn starch, the particle diameter becomes slightly larger, average 15.8μm about; thermal gravimetric analysis results showed that, compared with the ordinary waxy corn starch, magnetic degeneration heat of the waxy corn starch stability has improved. Experiment magnetic starch microspheres as the carrier, using glutaraldehyde cross-linking method has been successfully immobilized lipase immobilized lipase and free enzyme in the different part of the enzymatic properties, and the lipase is immobilized, the enzyme activity is free 35% of the enzyme activity; compared to the free enzyme has a wider pH range; the free enzyme catalytic temperature of 40 ° C, the immobilized enzyme catalytic temperature of 45 ° C, an improved 5 ° C than the free enzyme description fixed after the lipase of the heat resistance is improved.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Natural polymers ( polymer ) > Polymer polysaccharides > Starch, dextrin,glycogen, inulin
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