Calorimetric and other interaction studies on mineral-starch adsorption systems

Khosla, N. K. ; Bhagat, R. P. ; Gandhi, K. S. ; Biswas, A. K. (1984) Calorimetric and other interaction studies on mineral-starch adsorption systems Colloids and Surfaces, 8 (4). pp. 321-336. ISSN 0166-6622

Full text not available from this repository.

Official URL:

Related URL:


Studies have been made on adsorbabilities of starch, phosphorylated starch and starch constituents - amylose and amylopectin - on hematite and also calcite. The adsorption process is slow, partially irreversible, non-physical and appreciably exothermic. For a small starch concentration, ΔH on hematite reaches a maximum of 314 J/g starch adsorbed, and then falls off at higher concentration, probably due to partial deanchorage and reorientation of adsorbed molecules initially lying flat on the surface. Adsorption isotherm patterns, including pH-dependence behaviour, are similar for starch and amylopectin. The magnitude of adsorption of amylose, compared to that of amylopectin (nearly 20 times bulkier), is larger on a molar basis but smaller on a g/cm2 basis. Thus, interpretation of calcite-starch adsorption data should be made in terms of amylose as well as amylopectin. For the hematite-starch system, adsorption of amylopectin is of crucial importance. Conductometric data and IR spectrograms point to specific chemical interactions between starch constituents and ions such as Fe2+ and Ca2+. These are evidence of the existence of chemisorption bonds of amylose as well as of amylopectin interacting on calcite and hematite surfaces.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:11508
Deposited On:09 Nov 2010 06:44
Last Modified:02 Jun 2011 06:12

Repository Staff Only: item control page