Method for accurate extraction of sweet potato starch

Abstract

The invention provides a method for accurate extraction of sweet potato starch. The method comprises the following steps: (1) crushing sweet potatoes directly without washing to obtain a sweet potato pulp; (2) diluting the sweet potato pulp with water at a weight ratio of the sweet potato pulp to the water of 1:(3-5), and then filtering to obtain filtrate; (3) adding a mixed solution containing abrasive powder of gypsum, a sweet potato leaf extract and soybean oil into the filtrate with the added amount of 0.1% of the weight of the filtrate, then stirring uniformly, wherein during the preparation of the mixed solution, the weight ratio of the abrasive powder of gypsum to the sweet potato leaf extract to the soybean oil is 10:1:1, the abrasive powder of gypsum is put dissolved in water at first to obtain saturated gypsum water, and then the sweet potato leaf extract and the soybean oil are added and are stirred uniformly to obtain the mixed solution; (4) after stirring uniformly, standing for deposition to ensure that the mud, the sweet potato starch and the water in the filtrate are separated into an upper layer, a middle layer and a lower layer; (5) evacuating the water at the upper layer, and taking out the sweet potato starch; (6) performing sun-drying or oven-drying on the sweet potato starch, and bagging.

Description

technical field [0001] The invention relates to food processing, in particular to a fine extraction method of sweet potato starch. Background technique [0002] The nutritional value of sweet potato is very high, it contains a variety of vitamins and trace elements, and is also rich in lysine. Regular consumption is conducive to balanced nutrition, so it has always been a favorite food for people. In the process of processing starch by traditional natural sedimentation method, sweet potatoes must be cleaned in advance before beating. Many manufacturers use mechanical cleaning, which requires adding sweet potato cleaning machines. Some use manual cleaning, which will inevitably increase labor and labor intensity. In a word, whether it is mechanical or manual cleaning, it will consume a lot of manpower and material resources, which will increase the production cost. Furthermore, when the traditional natural sedimentation method processes starch, the water consumption is lar...

AI Technical Summary

Problems solved by technology

Some use artificial cleaning, which is bound to increase labor and labor intensity

In short, whether it is mechanical or manual cleaning, it takes a lot of manpower and material resources, which increases production costs.

Furthermore, when the traditional natural sedimentation method processes starch, the water consumption is large, the sedimentation time is long, the production cycle is long (about 24 hours), and the starch extraction rate is lower than 85%.

When settling, the separation effect of sweet potato starch and soil and other impurities is poor, resulting in low purity of sweet potato starch, poor whiteness, off-white, and poor taste