Preparation method and application of acetylated starch nano-micelle
A technology of acetylated starch and nano micelles, which is applied in the direction of climate change adaptation, medical preparations of non-active ingredients, pharmaceutical formulations, etc., can solve the limitations of the application of nano-carrier systems, no special functional groups, short amylose and Acid-thinned starch has less charge and other problems, and achieves the effects of controllable particle size, broad application prospects, and simple process route
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Embodiment 1
[0041] Embodiment 1: the impact of ethanol concentration on the molecular weight of acid-thinned starch
[0042] (1) the waxy cornstarch solution is adjusted into the starch milk that concentration is 25% with ethanol solution, and the volumetric concentration of ethanol solution is as shown in table 1;
[0043] (2) Add hydrochloric acid (hydrochloric acid:starch=1:25, v / w) into the starch milk in (1) under stirring, control the reaction temperature to 65°C, and the reaction time to 1h.
[0044] (3) After step (2), add Na to the reaction system 2 CO 3 Solution, stirred for 5min;
[0045] (4) After the acid hydrolysis reaction, wash with water and filter, and the obtained starch sample is dried, pulverized and sieved to obtain the acid hydrolyzed starch.
[0046] Table 1 Effect of ethanol concentration on the molecular weight of acid-thinned starch
[0047]
[0048] Note: WCS—waxy corn raw starch; HE90—acid-thinned starch obtained at 90% ethanol concentration; HE70—acid-...
Embodiment 2
[0050] Embodiment 2: the preparation of acid-thinned starch
[0051] (1) with 90% ethanol solution, the waxy cornstarch solution is transferred into a starch milk with a concentration of 25%;
[0052] (2) Add hydrochloric acid (hydrochloric acid:starch=2:25, v / w) into the starch milk in (1) under stirring, control the reaction temperature to 65°C, and the reaction time to 1h.
[0053] (3) After step (2), add Na to the reaction system 2 CO 3 Solution, stirred for 5min;
[0054] (4) After the acid hydrolysis reaction, wash with deionized water and filter, and the obtained starch sample is dried, pulverized and sieved to obtain the acid hydrolyzed starch.
Embodiment 3
[0055] Embodiment 3: Effect of the ratio of acetic acid and acetic anhydride on the properties of acid-thinned starch
[0056] (1) Place the starches (HE70 and HE90) obtained in Example 1 with ethanol concentrations of 70% and 90% in an oven, and dry them overnight at 45° C. to control the moisture content below 8%.
[0057] (2) Take 10 g of the starch obtained in (1), add glacial acetic acid and acetic anhydride to prepare starch milk with a concentration of 20%; the ratios of glacial acetic acid and acetic anhydride are 25:25 and 35:15, respectively. Under the stirring state, the reaction temperature was controlled to be 70° C., and the reaction time was 1 h.
[0058] (3) add catalyzer concentrated sulfuric acid (concentration is 98%) to (2) reaction system, add-on is 10% (concentrated sulfuric acid volume / starch quality);
[0059] (4) After the esterification reaction, the starch was precipitated with ice water, washed several times with deionized water to pH 5.5-6.5, filt...
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