Starch is a group of polysaccharides, composed of glucopyranose units joined together by-glucosidric linkages. It conforms to the molecular formula, (C6-H10O5)n, where n varies from a few hundred to over one million. Starch is found as the reserve carbohydrate in various parts of plants and is enzymatically broken down to glucose to other carbohydrates according to the metabolic needs of the plants. Industrially, starch is broadly divided into two types viz., natural and modified. Natural starches also designated as unmodified starches or simply starches are obtained from grains such as sorghum. From roots like potato, tapioca and arrowroot, and from the pith of the stems of certain palms such as sago. They are further classified into cereal starches and root starches. The characteristics of the natural starches are changed by chemical or enzymatic action and the products of these reactions are termed modified starches. This group includes dextrin, acid-modified starches, oxidized starches, starch esters, starch ethers, dialdehyde starches, and cationic starches. Starch can be obtained from maize, sorghum, roots and tubers such as tapioca, arrowroot, potato and from the pith of the stems of certain palms such as sago. Physical and chemical properties of starch vary according to the raw material from which it is derived. Starch is a high polymeric carbohydrate with the molecular formula (C6H10O5)n where n varies from a few hundred to over one granules, usually made up of both a linear polymer (amylose) and a branched polymer dissolves in hot water. Starch granules gelatinize in water when the temperature is raised to about 60-700C. At higher temperatures they well progressively to form a paste or solution and the shorter, linear molecules dissolve. The solutions form a gel on cooling depending upon the variety and concentration of starch present. Starch is an absorbent for water. Under normal atmospheric conditions most starches contain 10-17% moisture. Starch and Glucose are reserved carbohydrates of plants and are therefore widely distributed in their crude form. They can be found in almost all fruits, vegetables and corns. There is no definite information as to how they were initially obtained. But different countries are known to be using different agricultural sources for production of starch. While Japan and the European countries produce starch from potatoes, America from corn, countries like Thailand and Brazil are understood to be producing starch mainly from tapioca. In the case of India, starch is being produced from Maize as well as tapioca. While the units producing starch from maize are concentrated in large sector, the units producing starch from tapioca are large concentrated in the small-scale sector. Commercially glucose is produced from starch only and these two products are generally made in the same unit side by side. The history of starch and glucose Industry dates back to early forties before the Second World War starch used to be imported from European countries. But owing to difficulties in importing starch and difficulties in continuing the production of cotton textiles (where starch finds its extensive use in the manufacture of adhesives, sizing and finishing in textiles) two units namely Anil starch products with their factories located at Ahmedabad, in the year 1939 and 1941 respectively. Starch and Glucose can be used in different end use industries such as in the manufacture of adhesives, sizing and finishing in textiles, thickening agents in gravies, custards, and confectioneries. Sizing papers, Cosmetics, explosives, reagent, face powders, indicators in domestic analysis, water soluble packaging films, book bindings fabrics, distilled liquors, malt sugar, cattle feed ingredient, rubber reinforcing resins etc.
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