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Improved colorimetric determination of chitosan concentrations by dye binding
Asaf Mendelovits1, Tami Prat, Yotam Gonen
1Tel Hai College, Environmental Sciences Department, Upper Galilee 12210, Israel.
Applied Spectroscopy
|July 26, 2012
Summary
This study introduces a faster, more sensitive method for quantifying chitosan in water using a colorimetric technique. By measuring uncomplexed dye after centrifugation, sensitivity improves to over 2 ppm.
Area of Science:
- Analytical Chemistry
- Polymer Science
Background:
- Chitosan is increasingly used, necessitating efficient quantification methods.
- Existing colorimetric methods use dye binding but lack optimal sensitivity.
Purpose of the Study:
- To develop an improved, highly sensitive colorimetric method for chitosan quantification.
- To enhance existing dye-binding techniques for better detection limits.
Main Methods:
- A colorimetric assay involving Cibacron Brilliant Red 3B-A (BR) dye and chitosan.
- Centrifugation to sediment the chitosan-dye complex.
- Spectrophotometric measurement of uncomplexed dye in the supernatant.
Main Results:
- The improved method achieves a sensitivity exceeding 2 ppm for chitosan.
- Equilibration time was found to have no significant impact on measurements.
- Potential for mechanistic insights through charge measurements and spectral shifts.
Conclusions:
- The developed centrifugation-based colorimetric method offers enhanced sensitivity for chitosan detection.
- This technique provides a simple and effective approach for water solution analysis.
- Further studies can explore the interaction mechanism between chitosan and the BR dye.
