Complexation Mechanism of Dextrin with Metal Hydroxides

✍ Scribed by G.Bhaskar Raju; Allan Holmgren; Willis Forsling

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 115 KB
• Volume: 200
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5332

✦ Synopsis

Monosaccharides were also found to form Schiff base com-The complexation of dextrin with metal hydroxides was studied plexes whose behavior closely resembles that of amino acids quantitatively by FT-IR and UV-visible reflectance spectroscopic and peptides. Metal-carbohydrate coordination complexes techniques. Though three hydroxyl groups are present in each have long been used as mineral supplements because of their dextrin molecule, complexation involving only two hydroxyl greater absorption in the digestive system; e.g., iron-dextrin groups situated at the C-2 and C-3 positions has been studied by compositions are used in treating iron deficiency. More remany investigators. Involvement of a third hydroxyl group situcently, metal-pectate compositions have been advocated for ated at the C-6 position was examined in the present study. Since their mineral content (3). Pectates, including polygalacturometal hydroxy sites were found to play a key role in the complexnic acids present in root systems of ''Armeria maritima,'' a ation, precipitates of Ca(OH) 2 and Pb(OH) 2 were separately mixed with dextrin solutions at different ratios. Complexes with copper-tolerant species, were found to act as major binding a stoichiometry of 2:3 (dextrin:metal ion) were identified, indicatsites for Cu 2/ ions (4). Thus there are many examples where ing the involvement of a third hydroxyl group. However, the ratio polysaccharides and their derivatives play important roles in of metal ions to hydroxyl groups of dextrin remained as 1:2. Comspecific biological functions.

plexation between dextrin and metal hydroxide via a condensation

Deiana and co-workers (5) have studied the complexation mechanism is proposed.