Amylose-iodine complex formation without KI: Evidence for absence of iodide ions within the complex
✍ Scribed by Vincent T. Calabrese; Arshad Khan
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 143 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
Amylose-iodine (AI) complex has been synthesized in aqueous solution without added KI. Complex formation (with solid iodine in amylose solution) is maximized at approximately 35°C and decreases beyond that temperature. Ion-selective electrode (ISE) measurements of an aqueous solution of iodine and AI complex indicate that there is no change in the I Ϫ ion concentration when the complex forms. This suggests that I Ϫ ions (including I 3 Ϫ , I 5 Ϫ , and others) cannot be involved in forming the AI complex. The present work also reports a new and simple method for providing both the iodine-binding capacity (IBC) of amylose and the dissociation mechanism for the AI complex.