Method for preparing starch fatty acid ester through mechanical activation-microwave solid phase method
A technology of mechanical activation and starch ester, applied in the field of modified starch, can solve the problems of unstable performance and low degree of substitution, and achieve the effects of fast heating speed, no environmental pollution, and increased collision probability.
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Embodiment 1
[0033] The preparation method of fatty acid starch ester in the present embodiment may further comprise the steps:
[0034](1) Mechanically activated esterification: Mix tapioca starch and palmitic acid at a weight ratio of 10:1.2, put them into a ball mill, and mill at 60°C and 300 r / min for 60 minutes, and add 1.0% of the weight of tapioca starch dropwise during the ball milling process 2.0 mol L -1 hydrochloric acid to activate the primary starch ester and synchronously carry out the first esterification reaction to obtain the primary starch ester;
[0035] (2) Esterification by microwave heating: Take the primary starch ester out of the ball mill, adjust the water content to 24%, put it in a microwave oven, and heat it for 2 minutes under the power of 800W, so that the primary starch ester undergoes a second esterification reaction to obtain Highly substituted starch esters;
[0036] (3) Washing: After cooling the highly substituted starch ester, wash it three times with...
Embodiment 2
[0040] The preparation method of fatty acid starch ester in the present embodiment may further comprise the steps:
[0041] (1) Mechanically activated esterification: mix potato starch and lauric acid at a weight ratio of 10:3, put them into a ball mill, mill at 30°C, 400 r / min for 90 minutes, and add 1.5% tapioca starch by weight dropwise during the milling process 3.0 mol L -1 Sulfuric acid to activate the primary starch ester while synchronously carrying out the first esterification reaction to obtain the primary starch ester;
[0042] (2) Esterification by microwave heating: Take the primary starch ester out of the ball mill, adjust the water content to 20%, put it in a microwave oven, and heat it in a microwave for 3 minutes at a power of 400W, so that the primary starch ester undergoes a second esterification reaction to obtain Highly substituted starch esters;
[0043] (3) Washing: After cooling the highly substituted starch ester, wash it twice with 90% methanol to o...
Embodiment 3
[0047] The preparation method of fatty acid starch ester in the present embodiment may further comprise the steps:
[0048] (1) Mechanically activated esterification: Mix cornstarch and stearic acid at a weight ratio of 10:1.5, put them into a ball mill, and mill at 70°C and 200 r / min for 30 minutes. During the milling process, add tapioca starch by weight 1.2 % of 2.5 mol L -1 hydrochloric acid to activate the primary starch ester and synchronously carry out the first esterification reaction to obtain the primary starch ester;
[0049] (2) Esterification by microwave heating: take the primary starch ester out of the ball mill, adjust the water content to 30%, put it in a microwave oven, and heat it in a microwave for 3 minutes at a power of 80W, so that the primary starch ester undergoes a second esterification reaction to obtain Highly substituted starch esters;
[0050] (3) Washing: After cooling the highly substituted starch ester, wash it twice with 80% ethanol to obtai...
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Abstract
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