Starch

Krakhma?l — the polysaccharide, the white under the microscope granular powder, not dissolved in the cold water, in the hot water will swell, is formed colloidal solution (starch paste); with the solution iodine it gives dark-blue painting.

The molecule of starch is heterogeneous in the sizes.

Starch is formed as a result of photosynthesis in leaves of plants, it is put aside "about the reserve" in the tubers, the rhizomes, the grains.

In the stomachic circuit of man and the animal starch yields to the hydrolysis and it is converted in , which is mastered by organism.

In the technology the transformation of starch in (process of saccharification) occurs via its kipecheniya for the elongation of several hours with the rozbavlennoy sulfuric acid (the catalytic influence of sulfuric acid on the saccharification of starch was discovered in g. K. S. ?????????). In order from the obtained solution to move away in it is added the chalk, obtaining from the sulfuric acid undissolved calcium sulfate. The latter they filter and they evaporate substance. Is obtained thick sweet mass - the starch sirup, which contains besides glucose a significant quantity of remaining products of hydrolysis of starch.

Treacle is used for the preparation of confectionery articles and for the diverse technical purposes.

If it is necessary to obtain clean glucose, then boiling starch they conduct longer than its more quantitative transformation into the glucose is achieved. Obtained after neutralization and filtration solution they congeal, until the crystals of glucose begin to fall out from it.

With heating of dry starch to 200-2shch0°S occurs its partial decomposition and it is obtained the mixture of less complex than the starch the polysaccharides ( and others).