Preparation method for oxidized and Schiff base-modified high-amylose corn starch
A technology of corn starch and high amylose, which is applied in the field of grain processing, can solve the problems of less high amylose corn starch, cannot be used in the food field, and does not have gelatinity of high amylose corn starch, and achieves simple equipment, integrity retention, and improved thermal stability Effect
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Embodiment 1
[0045] A kind of preparation method of oxidation and Schiff base modification high amylose cornstarch, comprises the following steps:
[0046] (1) adding water to high amylose corn starch to make a starch emulsion with a mass fraction of 40%;
[0047] (2) Put the starch emulsion in a constant temperature water bath and heat it to 50°C with stirring, then adjust the pH to 8 with 1mol / L NaOH solution, and then slowly add 0.4% of the dry weight of starch Sodium hypochlorite (according to available chlorine), oxidation reaction for 4 hours, dropwise add sodium bisulfite solution with a mass fraction of 30% until the reaction is terminated, adjust the pH to 6.8±0.1 with 0.5mol / L hydrochloric acid solution, suction filter after cooling, and wash with distilled water , and then dried, pulverized, and passed through a 100-mesh sieve to obtain oxidized high-amylose corn starch, with an aldehyde content of 1.071% and a carboxyl content of 0.026%;
[0048](3) Add water to oxidized high ...
Embodiment 2
[0050] A kind of preparation method of oxidation and Schiff base modification high amylose cornstarch, comprises the following steps:
[0051] (1) adding water to high amylose corn starch to make a starch emulsion with a mass fraction of 40%;
[0052] (2) Put the starch emulsion in a constant temperature water bath and heat it until the starch emulsion reaches 50°C with stirring, adjust the pH to 8 with 1mol / L NaOH solution, and then slowly add 0.43% of the dry weight of the starch in drops. Sodium hypochlorite (according to available chlorine), oxidation reaction for 4 hours, dropwise add sodium bisulfite solution with a mass fraction of 30% until the reaction is terminated, adjust the pH to 6.8±0.1 with 0.5mol / L hydrochloric acid solution, suction filter after cooling, and wash with distilled water , and then dried, pulverized, and passed through a 100-mesh sieve to obtain oxidized high-amylose cornstarch, with an aldehyde content of 1.218% and a carboxyl content of 0.0425%;...
Embodiment 3
[0055] A kind of preparation method of oxidation and Schiff base modification high amylose cornstarch, comprises the following steps:
[0056] (1) adding water to high amylose corn starch to make a starch emulsion with a mass fraction of 40%;
[0057] (2) Put the starch emulsion in a constant temperature water bath and heat it until the starch emulsion reaches 55°C with stirring, then adjust the pH to 8 with 1mol / L NaOH solution, and then slowly add 0.2% of the dry weight of starch Sodium hypochlorite (according to available chlorine), oxidation reaction for 4 hours, dropwise add sodium bisulfite solution with a mass fraction of 30% until the reaction is terminated, adjust the pH to 6.8±0.1 with 0.5mol / L hydrochloric acid solution, suction filter after cooling, and wash with distilled water , and then dried, pulverized, and passed through a 100-mesh sieve to obtain oxidized high-amylose corn starch, with an aldehyde content of 0.526% and a carboxyl content of 0.0513%;
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