Method for preparing methyl starch
A technology of methyl starch and starch, which is applied in the field of chemical modification of natural polysaccharide polymers, can solve the problems that the efficiency of starch is difficult to be greatly improved, and achieves remarkable thickening and emulsifying effects, good cold water solubility, low cost effect
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Embodiment 1
[0023] (1) Add 9 parts of absolute dry tapioca starch, 2 parts of activator urea, 3 parts of sodium chloride and 20 parts of 95% ethanol into the reactor, react at 58°C; add 1 part of cetyltrimethylammonium bromide 1, 1 part of tetrabutylammonium bromide and 3 parts of ammonium chloride are mixed catalysts, then add 57 parts of dimethyl carbonate, and react at 58 ° C for 2 hours;
[0024] (2) Warm up to 69°C, add 4 parts of 50% potassium carbonate aqueous solution dropwise, react for 8 hours, wash, extract, dry and pulverize the product to obtain methyl starch after cooling.
[0025] The parts are parts by mass.
[0026] The 1H NMR spectra of starch at δ5.05, 4.6, 3.6, 3.42, and 3.35 are the absorptions of H-1, H-4, H-3, H-2, H-5, and H-6 on starch glucose residues, respectively peak. Compared with starch, in the 1H NMR spectrum of the product of this example, there is a sharp absorption peak at δ3.15, which is the characteristic absorption of methoxy. It shows that the pro...
Embodiment 2
[0029] (1) Add 9 parts of absolute dry potato starch, 4 parts of urea and 19 parts of 95% ethanol into the reactor to start the reaction; then add 5 parts of tetrabutylammonium bromide, 58 parts of dimethyl carbonate, Down reaction 1.5 hours;
[0030] (2) Warm up to 68°C, add 5 parts of 51% potassium carbonate aqueous solution dropwise, react for 7 hours, wash, extract, dry and pulverize the product to obtain methyl starch after cooling.
[0031] The parts are parts by mass.
[0032] The 1H NMR spectrum of the product in this example is the same as in Example 1, except that the absorption peak at δ3.15 is weaker and the peak area is smaller. It shows that the product is indeed methyl starch.
[0033] The determination of methoxyl content adopts Zeisel methoxyl determination method. After determination, the methoxyl content of the methyl starch prepared in this embodiment is 3.3%.
Embodiment 3
[0035] (1) 10 parts of dry corn starch, 4 parts of urea and 17 parts of 95% ethanol are added to the reactor to start the reaction; 5 parts of cetyltrimethylammonium bromide and 60 parts of dimethyl carbonate are added, React at 53°C for 1 hour;
[0036] (2) Warming up to 74°C, adding 4 parts of 52% potassium carbonate aqueous solution dropwise, reacting for 8 hours, washing, extracting, drying and pulverizing the product after cooling to obtain methyl starch.
[0037] The parts are parts by mass.
[0038] The 1H NMR spectrum of the product in this example is the same as in Example 1, except that the absorption peak at δ3.15 is weaker and the peak area is smaller. It shows that the product is indeed methyl starch.
[0039] The determination of methoxyl content adopts Zeisel methoxyl determination method. After determination, the methoxyl content of the methyl starch prepared in this embodiment is 3.8%.
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