Chelating, film‐forming, and coagulating ability of the chitosan–glucan complex from Aspergillus niger industrial wastes

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Abstract
Waste mycelia of Aspergillus niger from a citric acid production plant are simply treated with boiling 30–40% NaOH aqueous solutions for 4–6 hr to obtain the insoluble chitosan‐glucan complex whose infrared, ESR, and x‐ray diffraction spectra are reported. A number of transition‐ and post‐transition‐metal are chelated and collected by chitosan‐glucan with higher yields than by animal chitosan. Immediate flocculation occur upon mixing chitosan‐glucan dispersions with alginate and polymolybdate solutions. Membranes are also obtained from chitosan–glucan dispersions in acetic acid or in chloral and dimethyl formamide mixtures.