Starch consists of two polysaccharides, amylose and amylopectin and represents approximately 20-25% of the total polysaccharide content in starch. Amylose molecules consist of single mostly unbranched chains of 500-20,000 alpha-(1->4)-D-glucose residues dependent on source (e.g. wheat, rice, potato, tapioca, etc). Amylose can form an extended shape (hydrodynamic radius 7-22 nm) but generally tends to wind up into a rather stiff left-handed single helix or form even stiffer parallel left-handed double helical junction zones. Hydrogen bonding between aligned chains causes retrogradation and releases some of the bound water (syneresis). The aligned chains may then form double stranded crystallites that are resistant to amylases. These possess extensive inter- and intra-strand hydrogen bonding, resulting in a fairly hydrophobic structure of low solubility. The amylose content of starches is thus the major cause of resistant starch formation. Synonyms: AO 512, AS 10, AS 110, AS 30, AS 30 (carbohydrate), AS 320, AS 5, AS 70, Amylose EX 1, EX-I, Kleptose Linecaps 17, Polyamylose, V Amylose, alpha-Amylose CAS No: 9005-82-7 Molecular Formula: (C6H10O5)n Molecular Weight: 12,000-16,000 Appearance: White to off-white powder Loss on Drying: 13% pH: 6.0-7.5 Sulfated Ash: 0.5% Storage and Stability: Store at 4C. Stable for 12 months after receipt.
Molecular Weight:
1200016000
CAS Number:
[9005-82-7]
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