A kind of preparation method of high amylose starch
A high-amylose and starch technology, applied in the field of starch modification, can solve the problems of cumbersome procedures, high price of high-amylose starch, etc., and achieve the effects of simple operation, easy industrial production, and content improvement
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[0015] The invention provides a kind of preparation method of high amylose starch, comprises the following steps:
[0016] (1) mixing starch with water to obtain starch milk;
[0017] (2) performing twin-screw extrusion on the starch milk to obtain high amylose starch.
[0018] The invention mixes starch and water to obtain starch milk. In the present invention, the starch is preferably one or more of corn starch, wheat starch, sorghum starch, sweet potato starch, wild acorn starch and pueraria starch. The present invention has no special requirements on the source of the starch, and conventional commercially available starch in this field can be used.
[0019] In the present invention, the amount of the water is preferably 10-15% of the starch mass, more preferably 12-14%; the mixing time is preferably 30-40min, more preferably 32-36min; in the present invention , the mixing method is preferably stirring and mixing. The present invention has no special requirements on the...
Embodiment 1
[0025] Weigh 6000 g of commercially available corn starch, and use the ultraviolet spectrophotometer method to detect the starch. After detection, the mass content of amylose in the starch is 27%, and the mass content of amylopectin is 73%.
[0026] The above-mentioned cornstarch is equally divided into 3 parts, each part is mixed with 200g of water for 40 minutes, and twin-screw extrusion is carried out at the screw speeds of 800r / min, 1200r / min and 1600r / min respectively, wherein the heating of the twin-screw extruder The zone temperature was set to 90°C, and the obtained high-amylose solids were marked as sample 1, sample 2, and sample 3, and the obtained samples 1, 2, and 3 were pulverized using a pulverizer.
[0027] The contents of amylose and amylopectin in sample 1, sample 2, and sample 3 were respectively detected by ultraviolet spectrophotometer, and the obtained results are listed in Table 1.
[0028] Table 1 The mass content of amylose and amylopectin in starch at ...
Embodiment 2
[0032] Weigh 6000g of commercially available wheat starch, and use the ultraviolet spectrophotometer method to detect the starch. After detection, the mass content of amylose in the starch is 27%, and the mass content of amylopectin is 73%.
[0033] Divide the above-mentioned wheat starch into 3 parts, mix each part with 300g of water for 40 minutes, and carry out twin-screw extrusion under the conditions of heating zone temperatures of 90°C, 93°C, and 95°C respectively, wherein the screw of the twin-screw extruder The rotational speeds were all set to 1200r / min, and the obtained high amylose solids were marked as sample 4, sample 5, and sample 6 respectively, and the obtained samples 4, 5, and 6 were pulverized by a pulverizer.
[0034] The contents of amylose and amylopectin in sample 4, sample 5, and sample 6 were respectively detected by ultraviolet spectrophotometer, and the obtained results are listed in Table 2.
[0035] Table 2 The mass content of amylose and amylopect...
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