A kind of preparation method of oxidation and schiff alkali modified high amylose corn starch
A corn starch, high amylose technology, applied in food ingredients as a gelling agent, food ingredients, food science and other directions, can solve the problems of less high amylose corn starch, can not be used in the food field, does not have high amylose corn starch gel properties, etc. Simple equipment, preserved integrity, improved thermal stability
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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%;
[0058...
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