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Preparation, Properties of Maltosyl-α-cyclodextrin

Author: ZhangYongWei
Tutor: JinZhengYu
School: Jiangnan University
Course: Food, oil and vegetable protein
Keywords: maltosyl-α-cyclodextrins pullanase purify thermal stability complex
CLC: TQ281
Type: Master's thesis
Year: 2009
Downloads: 26
Quote: 0
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Abstract


α-cyclodextrin（α-cyclodextrin） has a medium intramolecular cavity of a cylindrical shape.It has been used as complexing agents for the stabilization of oily unstable substances .Maltosyl-α-cyclodextrins have better water solubility and can be more safely and widely used in the food industry. The synthesis、purification and thermal stability of maltosyl-α-cyclodextrin was studied in this paper.In this study, the monofactorial tests and response surface method were performed to optimize the preparation process of maltosyl-α-cyclodextrin.The following optimal parameters were obtained: reaction time of 24h,reaction temperature of 57.3℃, molar ratio of maltose toα-cyclodextrin was 17:1, 440 U/gα-cyclodextrin.Qualitative analysis of the reaction products was investigated by thin layer chromatography, electron spray ionization-mass spectrometry, and infrared spectrometry. Results of electron spray ionization-mass spectrum indicated that maltosyl-α-cyclodextrin was the majority components. Results of qualitative analysis indicated that maltosyl-α-cyclodextrin was synthesized and enzymatic synthesis of maltosyl-α-cyclodextrin was relatively a specific reaction with limited quantity of by-products formed.The removal of maltose by Active Carbon Chromatography was studied. Maltose was eliminated 15%-30%-45% ethanol grads elution .Maltose went down to 1.8% with 45% ethanol elution. Sephadex G-15 silica column was used to purify maltosyl-α-cyclodextrin,and the purity can be 97%.The thermal stability of prepared maltosyl-α-cyclodextrin were determined, and the decomposition temperature of maltosyl-α-cyclodextrin was between 300 and 400℃,the peak value was about 320℃. Thermal stability of maltosyl-α-cyclodextrin was better thanα-cyclodextrin, and their decoposition temperature enhanced about 4℃.The thermal decomposition kinetics was investigated, the activation energy EA=171.95kJ/mol,and the pre-exponential factor k0 is 2.19×1010min-1.The inclusion compound of methyl red with maltosyl-α-cyclodextrin was prepared,and its strucral characterization was studied by UV and IR. Phase solubility diagram method demonstrated the molecular ratio of methyl red to maltosyl-α-cyclodextrin in the inclusion compound was 1:1.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > Production of natural organic compounds > Carbohydrates, sugars
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