No-waste production method for peeled sweet potato starch

Abstract

The invention discloses a no-waste production method for peeled sweet potato starch. The provided method comprises the following steps: step 1. the sweep potato is peeled and / or the speck is removed; step 2. the sweep potato obtained in the step 1 is squeezed to obtain coarse size and coarse potato residue; and step 3. the coarse size obtained in the step 2 is treated to obtain starch in the coarse size and a first by-product, i.e., sweet potato size; the coarse potato residue obtained in the step 2 is treated to obtain starch in the coarse potato residue and a second by-product, i.e., potato powdered residue; and the coarse size and the washing water obtained during the coarse potato residue treatment are treated to obtain a third by-product containing polysaccharide and protein and water, and the water can be further taken as the washing water for the sweet potato, the starch and the coarse potato residue. The method can utilize all the nutritious substances in the sweet potato and is free from the influence of reduction of the starch content during the storage process of the sweet potato, and the application of the sweet potato size and the concentrated solution of the washing water provides a possibility of prolonging the processing cycle of the sweet potato starch.

Description

technical field [0001] The invention relates to the field of agricultural product processing, in particular to a waste-free production method of peeled sweet potato starch. Background technique [0002] Sweet potato is a crop that naturally maintains hybrid advantage. It has the characteristics of high and stable yield, drought resistance and barrenness. Even under drought-prone and barren cultivation conditions, it can achieve high yield. The world's high-yield record is 17515t / hm 2 , China's highest production record of 12513t / hm 2 . In addition, sweet potato is also a major drought-resistant crop, and its water consumption coefficient is only 300-350, which is 1 / 3 of that of wheat and 1 / 5 of that of rice. Not only can maintain certain economic benefits, but also has important ecological effects. [0003] Sweet potatoes are rich in starch, soluble sugar, crude protein, crude fiber and crude fat. In the past, sweet potatoes were mostly used as rations for farmers. Since...

AI Technical Summary

Problems solved by technology

After processing, the sweet potato raw material components are mainly divided into three parts: one is the starch products that enterprises rely on for survival; the other is difficult to handle, which will cause serious pollution to the environment after discharge, and a large amount of sweet potato starch processing waste liquid with soluble sugar and protein as the main components; The third is that the quality is low, and it is difficult to produce good economic benefits. The potato dregs products with starch and dietary fiber as the main components

[0005] In fact, although the starch content in sweet potatoes is rich, and the starch content in some fresh sweet potatoes is as high as 30% or more at the early stage of harvesting, due to the active amylase in sweet potatoes, this enzyme can reduce the starch in sweet potato raw materials to a very large extent during storage. The rapid degradation into dextrin and polysaccharide substances that are difficult to recycle leads to less and less starch products obtained through production with the extension of storage period, and the concentration of starch processing waste liquid that causes environmental pollution is getting higher and higher

Although in the best processing cycle, in order to obtain the greatest economic benefits, most starch processing enterprises even adopt the emergency measures of harvesting and processing at the same time, but this method is difficult to reverse the short processing cycle of fresh sweet potato starch, and the long-term idleness of plants and equipment. Compared with corn and potatoes, the passive situation of sweet potato starch processing has become the least advantageous project. So far, there are very few processing enterprises with large investment scale

[0006] Aiming at the waste liquid and waste residue produced in the processing of sweet potato starch, researchers have carried out a lot of research work. These researches have a good laboratory in alleviating the pollution level of sweet potato starch processing waste liquid to the environment and improving the application value of waste residue. effect, but there are still some difficulties in transformation and application in enterprises. The main reason is not the feasibility of production technology, but the quality of waste liquid and waste residue that starch processing enterprises can provide.

In the production process, enterprises add a large amount of washing water and antioxidants to ensure the quality of starch, so that the concentration of available substances in waste liquid is low, and the environment for reuse is poor, resulting in the application value of waste liquid, especially in food processing. really hard to improve

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