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Copper inclusion in cellulose using sodium D-gluconate complexes.

Hossam E Emam¹, Avinash P Manian, Barbora Siroká

¹Research Institute of Textile Chemistry and Textile Physics, Leopold-Franzens University of Innsbruck, A-6850 Dornbirn, Austria.

Carbohydrate Polymers

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Summary

Copper-loaded cellulose materials show promise as antimicrobial alternatives. Copper ions bind to cellulose via ligand exchange, with uptake influenced by pH and material carboxyl content.

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Estimation of Crystalline Cellulose Content of Plant Biomass using the Updegraff Method

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Published on: May 15, 2021

Area of Science:

Materials Science
Chemistry
Biotechnology

Background:

Cellulose-based materials are explored for novel applications, including antimicrobial uses.
Copper-containing materials offer potential as effective antimicrobial agents.
Copper d-gluconate complexes provide a soluble source for introducing copper into cellulosic matrices.

Purpose of the Study:

To investigate the sorption of copper ions into cellulose using copper d-gluconate complexes.
To elucidate the chemical mechanisms governing copper uptake in cellulose.
To understand the influence of pH on copper sorption and complex stability.

Main Methods:

Utilized copper d-gluconate complexes to impregnate swollen cellulose.
Studied copper sorption across a pH range of 6 to 13.
Employed spectrophotometry and cyclic voltammetry to analyze copper species and complex formation.
Calculated species distribution to estimate complex stabilities.

Main Results:

Copper sorption is pH-dependent, with higher content observed at pH 6 and 13 compared to pH 10.
Ligand exchange mechanism governs copper ion sorption into the cellulose matrix.
Carboxyl groups in cellulose are proposed as primary complex-forming sites.
Formation of solid copper deposits observed on fibers at high concentrations and prolonged immersion.

Conclusions:

The pH-dependent copper uptake is explained by the relative stabilities of copper-d-gluconate and copper-cellulose complexes.
Cellulose carboxyl content limits the maximum copper loading.
The findings support the development of copper-loaded cellulose for antimicrobial applications.