A kind of method utilizing esterified starch to prepare resistant dextrin
A technology for esterifying starch and resistant dextrin is applied in the field of preparing resistant dextrin to achieve the effects of reducing the amount of activated carbon, low viscosity and high light transmittance
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Embodiment 1
[0035] (1) Cornstarch and water are mixed into starch milk with a starch mass percentage of 35%, and stirred evenly;
[0036] (2) Use 2.5wt% NaOH to adjust the pH of the starch milk to 8.8-9.0, adjust the reaction temperature to 33°C, and stir for 40 minutes; add 4% acetic anhydride on a dry basis of the starch dropwise to the stirring starch milk, and mix at 60 After the dropwise addition of acetic anhydride is completed, NaOH is added dropwise to adjust the pH, and the pH of the feed solution is maintained at 8.4-8.6 during the entire reaction process; after the addition of acetic anhydride is completed, the pH reaction is continued for 30 minutes to obtain esterified starch milk;
[0037] (3) Add 2.5wt% HCl to the starch milk after esterification to neutralize the pH to 4.3-4.5, then add 35wt% hydrogen peroxide with 0.1% starch dry basis to react for 10 minutes to obtain esterified starch;
[0038] (4) Adjust the pH of esterified starch to 2.0-2.3 with 2.5wt% HCl, stir and ...
Embodiment 2
[0043] (1) Cornstarch and water are mixed to form starch milk with a starch mass percentage of 40%, and the mixture is evenly stirred;
[0044] (2) Use NaOH with a mass fraction of 3.0% to adjust the pH of the starch milk to 8.8-9.0, adjust the reaction temperature to 35°C, and stir for 40 minutes; add 8% acetic anhydride on a dry basis of starch dropwise to the stirring starch milk, and Add dropwise within 60-70min, and at the same time add dropwise NaOH to adjust the pH, and keep the pH of the feed solution during the entire reaction process at 8.4-8.6; after the dropwise addition of acetic anhydride, continue to maintain the pH for 30min to obtain esterified starch milk;
[0045] (3) Add 3.0wt% HCl to the starch milk after esterification to neutralize the pH to 4.3-4.5, then add 35wt% hydrogen peroxide with 0.1% starch dry basis to react for 10 minutes to obtain esterified starch;
[0046] (4) Adjust the pH of esterified starch to 2.0-2.3 with 3.0wt% HCl, stir and keep warm...
Embodiment 3
[0051] (1) Cornstarch and water are mixed to form starch milk with a starch mass percentage of 40%, and the mixture is evenly stirred;
[0052] (2) Use NaOH with a mass fraction of 3.5% to adjust the pH of the starch milk to 8.8-9.0, adjust the reaction temperature to 35°C, and stir for 40 minutes; add 8% acetic anhydride on a dry basis of starch dropwise to the stirring starch milk, and Add dropwise within 60-70min, and at the same time add dropwise NaOH to adjust the pH, and keep the pH of the feed solution during the entire reaction process at 8.4-8.6; after the dropwise addition of acetic anhydride, continue to maintain the pH for 30min to obtain esterified starch milk;
[0053] (3) Add 3.5wt% HCl to the starch milk after esterification to neutralize the pH to 4.3-4.5, and then add 35wt% hydrogen peroxide with 0.1% starch dry basis to react for 10 minutes to obtain esterified starch;
[0054] (4) Use 3.5wt% HCl to adjust the pH of the esterified starch to 2.0-2.3, stir and...
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