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Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants for energy storage.
The chemical formula of the starch molecule is (C 6 H 10 O 5) n. Starch is made up of long chains of sugar molecules that are connected together. The linear polymer amylose is the most basic form of starch, while amylopectin is the branched form.
18 Σεπ 2024 · The basic chemical formula of the starch molecule is (C 6 H 10 O 5) n. Starch is a polysaccharide comprising glucose monomers joined in α 1,4 linkages. The simplest form of starch is the linear polymer amylose ; amylopectin is the branched form.
Chemical Test for Starch or Iodine. Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil. Iodine - KI Reagent: Iodine is not very soluble in water, therefore the iodine reagent is made by dissolving iodine in water in the presence of potassium iodide.
10 Νοε 2023 · Starch or amylum is a homopolymer (each yields only one type of monosaccharide (glucose) after complete hydrolysis) composed of D-glucose units linked by α - (1→4) glycosidic bonds. The α - (1→4) glycosidic linkage between the glucose units is formed by starch synthases.
The classic test for the presence of starch is reaction with iodine. If starch molecules are present in a substance, the addition of iodine yields a deep blue color, which results from I 2 being trapped inside the spiral structures of amylose molecules.
Starches can be chemically dyed by reacting a procion dye with 2,4,6‑trichloro‐triazine or 2,4‑dichloro‐triazine , followed by reaction with alkaline starch [170,171]. A chloro group on the triazine ring of the dye derivative is replaced by a starch hydroxyl group to form a stable ether linkage between the dye and the starch.
