Preparation method of modified starch nanocrystal
A technology of starch nanocrystals and modified starch, applied in the field of modified starch development, can solve the problems of short carbon chain, low reaction efficiency and degree of substitution, etc., and achieve the effect of expanding the scope of application
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[0028] A method for preparing modified starch nanocrystals, using waxy rice starch as a raw material, using dilute sulfuric acid to hydrolyze raw starch granules to prepare starch nanocrystals, and using dodecenyl succinic anhydride as a modifier, lipase method The surface of the starch nanocrystal is hydrophobically modified to prepare the dodecenyl succinic acid modified starch nanocrystal. The process is:
[0029] (1) Starch pretreatment conditions:
[0030] Prepare 2-4M sulfuric acid solution, add 10%-20% starch, stir evenly, and then place it in an ultrasonic cell pulverizer for treatment. The ultrasonic treatment power is 400-600W, below 25°C, each action time is 30s, and the interval is 30s. The processing time is 50-60 minutes;
[0031] (2) Restricted degradation conditions of starch:
[0032] Place the ultrasonically treated starch milk in a constant temperature water bath at 30-40°C and stir at a speed of 100-200rpm for 72-96 hours, centrifuge the obtained nanocry...
Embodiment 1
[0040] Prepare a 3M sulfuric acid solution, add 10% waxy rice starch, and then act for 40 minutes under the condition of ultrasonic power of 500W and 25°C. The starch slurry was placed at 40° C. and stirred at a speed of 100 rpm for 72 hours, centrifuged to remove the supernatant, and the precipitate was washed with deionized water until it was neutral, and then freeze-dried.
[0041] Dodecenyl succinic anhydride was dissolved in absolute ethanol (30% V / V) and 10% wt of starch nanocrystals were added, then ultrasonically dispersed for 1 h, and 2‰ lipase and After molecular sieve, the mixture was stirred and reacted at 100 rpm for 36 h under the condition of 45° C. water bath. Molecular sieves and enzymes were removed by filtration, washed three times with 80% ethanol, and then vacuum-dried at 40° C. to obtain dodecenyl succinic anhydride modified starch nanocrystals. The degree of substitution was 0.089 as measured by back titration.
Embodiment 2
[0043] Prepare a 4M sulfuric acid solution, add 15% waxy rice starch, and act on it for 60 minutes under the condition of ultrasonic power 400W and 25°C. The starch slurry was placed at 50° C. and stirred at a speed of 100 rpm for 96 hours, centrifuged to remove the supernatant, and the precipitate was washed with deionized water until it was neutral, and then freeze-dried.
[0044] Dodecenyl succinic anhydride was dissolved in absolute ethanol (40% V / V) and then 15% wt of starch nanocrystals were added and ultrasonically dispersed for 1 h, and 5‰ lipase and After molecular sieve, the mixture was stirred and reacted at 100 rpm for 48 hours under the condition of 40° C. water bath. Molecular sieves and enzymes were removed by filtration, washed three times with 90% ethanol, and then vacuum-dried at 40° C. to obtain dodecenyl succinic anhydride modified starch nanocrystals. The degree of substitution was 0.148 as measured by back titration.
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