The invention discloses
acorn starch and a preparation method thereof. The method comprises the following steps that 1,
acorn kernels are soaked in water, primary circulating purification is conducted, suspension I is obtained, the
liquid phase in the suspension I is liquid matter containing water-soluble
starch, and the
solid phase is the
acorn kernels containing the water-insoluble
starch; 2, primary smashing is conducted on the suspension I, secondary circulating purification is conducted on smashing products, and suspension II is obtained; 3, secondary smashing is conducted on the suspension II, third circulating purification is conducted on the smashing products, and suspension III is obtained, wherein circulating purification repeats the following steps that water-soluble starch and impurities in the acorn kernels in the suspension are extracted into the
liquid phase, and adsorption and purification are conducted on the
liquid phase; 4, the suspension III is centrifuged,
sediment is taken,
drying is conducted, and the acorn starch is obtained. According to the acorn starch and the preparation method thereof,
water consumption is less,
engineering is simple, and industrialization is easy;
tannin is adsorbed through a composite resin method, enrichment and purification of the
tannin are completed in one step, and a comprehensive utilization technology is provided for acorn kernel development.