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
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/016666...
Related URL: http://dx.doi.org/10.1016/0166-6622(84)80127-4
Abstract
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 |
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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 |
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