A kind of preparation method of nano-starch-based pickering emulsion
A nano-starch, emulsion technology, applied in nano-technology, nano-technology, nano-technology for materials and surface science, etc., can solve the problems such as nano-starch granules that have not been seen, and achieve high starch utilization and yield, granule The effect of controllable diameter shape and good dispersion
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Embodiment 1
[0025] A preparation method of nano-starch-based Pickering emulsion, comprising the following steps:
[0026] (1) Ultrasonic-enhanced starch acidolysis: configure 5%-20% (w / v) starch suspension, boil for 30 minutes to ensure complete starch gelatinization, then control the temperature of the system to 50°C, and use pulsed ultrasonic to enhance pullulanase dehydration. Amylopectin to obtain dextrin solutions of different chain lengths.
[0027] The ultrasonic intensity is 100-1000W, the frequency is 5-20kHz, and the treatment method is pulse (10s on, 10s off); starch is one of corn starch, tapioca starch and potato starch; the amount of pullulanase added is 40-1000npun / g; the reaction temperature is controlled at 45-55°C; the molecular weight range of the prepared dextrin is 10 3 -10 5 g / mol, polydispersity coefficient > 2.0.
[0028] (2) Alcohol-alcohol graded precipitation: gradually add 1 / 4, 1 / 2, 3 / 4, 1, 2 and 4 times the volume of alcohol solution to the dextrin solutio...
Embodiment 2
[0035]5% common corn starch (amylose content 25.4%) suspension was boiled for 30min in a boiling water bath to ensure complete gelatinization of starch, then the temperature of the system was controlled to 50°C, 200npun / g pullulanase was added, and 300W, 10kHz ultrasonic conditions were added. Under pulse treatment (10s on, 10s off) for 10min, a dextrin solution was obtained. Add 1 / 4, 1 / 2, 3 / 4, 1, 2 and 4 times the volume of ethanol solution, centrifuge, and dry the precipitate at 40°C, grind it, and pass it through a 100-mesh sieve. The obtained dextrin was prepared into a solution with a concentration of 0.5% (w / v), 1% (w / w) of sodium trimetaphosphate and 2% (w / w) of Span 80 were added, and after mixing, the mixed The liquid was introduced into the inlet end of the atomizing nozzle, and the carbon dioxide gas was introduced into the inlet end of the atomizing nozzle (the feed ratio of the primary nanostarch suspension to carbon dioxide was 1:200 (v / v)), under 150W ultrasonic...
Embodiment 3
[0037] 5% waxy corn starch (amylose content 3.1%) suspension was boiled in a boiling water bath for 30min to ensure complete gelatinization of starch, then the temperature of the system was controlled to 50°C, 200npun / g pullulanase was added, and sonicated at 300W, 10kHz Under the condition of pulse treatment (10s on, 10s off) for 10min, a dextrin solution was obtained. Add 1 / 4, 1 / 2, 3 / 4, 1, 2 and 4 times the volume of ethanol solution, centrifuge, and dry the precipitate at 40°C, grind it, and pass it through a 100-mesh sieve. The obtained dextrin was prepared into a solution with a concentration of 0.5% (w / v), 2% (w / w) of oxalic acid and 0.5% (w / w) of Tween 80 were added, and after mixing, the mixture was Introduce the inlet end of the atomizing nozzle, and introduce carbon dioxide gas into the inlet end of the atomizing nozzle (the feed ratio of the primary nanostarch suspension to carbon dioxide is 1:400 (v / v)), under the condition of 300W ultrasonic, the The feed liquid ...
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