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Related Experiment Video

Updated: Jul 3, 2026

Engineering a Bilayered Hydrogel to Control ASC Differentiation

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Published on: May 25, 2012

Adsorption of BSA on strongly basic chitosan: Equilibria.

H Yoshida¹, H Nishihara, T Kataoka

¹Department of Chemical Engineering, University of Osaka Prefecture, 1-1, Gakuen-cho, Sakai, Osaka 593, Japan.

Biotechnology and Bioengineering

|May 1, 1994

Summary

A new chitosan adsorbent, Chitopearl 2503, shows higher bovine serum albumin (BSA) adsorption capacity than DEAE Sepharose. Adsorption is pH-dependent and sensitive to salt concentration, indicating electrostatic interactions are key.

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Area of Science:

Biochemistry
Materials Science
Chemical Engineering

Background:

Bovine serum albumin (BSA) is a key protein in biological research and therapeutics.
Efficient protein adsorption materials are crucial for purification and separation processes.
Chitosan-based materials offer potential as novel adsorbents due to their unique properties.

Purpose of the Study:

To evaluate Chitopearl 2503, a novel crosslinked chitosan, as an adsorbent for BSA.
To compare the adsorption performance of Chitopearl 2503 with DEAE Sepharose Fast Flow.
To investigate the influence of pH and salt concentration on BSA adsorption.

Main Methods:

Equilibrium isotherm studies were conducted for BSA adsorption on Chitopearl 2503 and DEAE Sepharose Fast Flow.
The effect of pH and sodium chloride (NaCl) concentration on adsorption was analyzed.
Langmuir equation was used to correlate the equilibrium data.
Inorganic ion exchange was measured to confirm adsorption mechanisms.

Main Results:

Chitopearl 2503 demonstrated favorable BSA adsorption at pH > pI (isoelectric point, ~4.8).
Adsorption capacity decreased significantly with increasing NaCl concentration, with no adsorption at 200 mol/m³.
The Langmuir equation provided a reasonable fit for the equilibrium data.
Chitopearl 2503 exhibited a 1.3 to 2.2 times higher saturation capacity for BSA compared to DEAE Sepharose Fast Flow.
Adsorption mechanism involves electrostatic attraction and protonation reactions.

Conclusions:

Chitopearl 2503 is a highly effective adsorbent for BSA, outperforming DEAE Sepharose Fast Flow.
BSA adsorption on Chitopearl 2503 is primarily governed by electrostatic interactions, influenced by pH and ionic strength.
The material's hard nature and resistance to compression make it suitable for column-based applications.