Method for preparing inulin short-chain fatty acid ester
A technology of fatty acid ester and fatty acid anhydride, which is applied in the field of preparation of inulin short-chain fatty acid ester, can solve problems such as low esterification rate, uncontrollable reaction, and environmental pollution, and achieves improved yield, simple preparation method, and high yield high rate effect
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Embodiment 1
[0028] The preparation of embodiment 1 inulin propionate
[0029] Add inulin to pyridine at 40°C to dissolve, stir during the dissolution process, and stir for 20 minutes to make the concentration of inulin in pyridine reach 30%, then add propionic anhydride dropwise to the pyridine solution, when propionic anhydride and When the molar ratio of inulin is 3:1, the dropwise addition is completed, the reaction time of the esterification reaction is 24h, and the reaction temperature is 40°C. After the reaction is completed, add deionized water for treatment, extract twice with dichloromethane, and organic The phases were sequentially extracted with saturated sodium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, concentrated by rotary evaporation, and dried by a vacuum pump to obtain the product inulin propionate. The yield of the product was 87%, and the degree of esterification was is 2.86.
Embodiment 2
[0030] The preparation of embodiment 2 inulin propionate
[0031] Add inulin to pyridine at 60°C to dissolve, stir during the dissolution process, and stir for 10 minutes to make the concentration of inulin in pyridine reach 15%, then add propionic anhydride dropwise to the pyridine solution, when propionic anhydride and When the molar ratio of inulin is 1:1, the dropwise addition is completed, the reaction time of the esterification reaction is 30h, and the reaction temperature is 20°C. After the reaction is completed, add deionized water for treatment, extract twice with dichloromethane, and The phases were sequentially extracted with saturated sodium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, concentrated by rotary evaporation, and dried by a vacuum pump to obtain the product inulin propionate, and the yield of the product was 82%, and the degree of esterification was is 2.26.
Embodiment 3
[0032] The preparation of embodiment 3 inulin propionate
[0033]Add inulin to pyridine at 20°C to dissolve, stir during the dissolution process, and stir for 20 minutes to make the concentration of inulin in pyridine reach 40%, then add propionic anhydride dropwise to the pyridine solution, when propionic anhydride and When the molar ratio of inulin is 5:1, the dropwise addition is completed, the reaction time of the esterification reaction is 12h, and the reaction temperature is 60°C. After the reaction is completed, add deionized water for treatment, extract twice with dichloromethane, and organic The phases were sequentially extracted with saturated sodium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, concentrated by rotary evaporation, and dried by a vacuum pump to obtain the product inulin propionate. The yield of the product was 83%, and the degree of esterification was is 2.50.
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