✦ LIBER ✦

Protolytic and complexing properties of microcrystalline chitosan with Co(II), Zn(II), and Cu(II) ions

✍ Scribed by Kazimiera Henryka Bodek; Aleksander Kufelnicki

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 445 KB
Volume: 57
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1995.070570515

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✦ Synopsis

It has been evidenced that microcrystalline chitosan (MCCh) with a determined (by the potentiometric method in nonaqueous medium) degree of deacetylation of 0.87 acts as a polymeric chelating agent with cobalt(I1) and zinc(I1). The predomination of hydrolytic reactions, in the case of copper(I1) ions, has been attributed to a change in crystalline character of the ligand. The protolytic reactions have been studied using the Katchalsky-Spitnik equation. The pH profiles have been shown for Co(I1)-MCCh and Zn(I1)-MCCh systems and the corresponding equilibrium constants have been determined as well. Both the amino and hydroxyl groups are involved in Co2+ complexation, whereas for Zn2+, the complexes are formed only via amino nitrogen.

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