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Exploration of a three-dimensional matrix as micro-reactor in the form of reactive polyaminosaccharide hydrogel beads using multipoint covalent interaction approach

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Abstract

Objectives

Diversity in backbone polymer composition makes hydrogel-based resources open to broad spectrum of applications. Biomacromolecules which have reactive functional groups in their structural frame and can also exhibit hydrogel properties could be utilized in biomedical, pharmaceutical and drug delivery applications after some chemical modifications.

Results

Present study aims towards development of chitosan-based hydrogel system crosslinked together with glucosyltransferase. Hydrogel structure worked as an immobilization matrix and as a microreactor system to catalyze the cleavage of a disaccharide. Uniform chitosan hydrogel beads were prepared and dextransucrase was attached using multipoint covalent interaction approach. Strong interaction was developed by linking polymeric hydrogel with the biocatalyst utilizing glutaraldehyde as spacer arms. This bifunctional crosslinking agent performed two important tasks that includes functionalization of hydrogel beads and crosslinking of this activated matrix system with enzyme fragments. Hydrogel beads required 18.0 h crosslinking time with enzyme (6.5 mg ml−1, 189.9 DSU) under specific environment (4 °C, 100 rpm) to saturate all available ends. Enzyme fragments were observed bound with hydrogel beads when screened for surface topology indicating successful crosslinking. Steady state kinetics of crosslinked dextransucrase was studied in detail and it was revealed that it can catalyse sucrose in 30.0 min at 35 °C (pH 5.5) with an energy of activation around 15.23 kJ mol−1 with increased Vmax (785 DSU ml−1) and Km (256 mM) values as compared to soluble enzyme version. Thermal stability of the crosslinked dextransucrase also particularly improved 2.5 fold at 45 °C in comparison with soluble enzyme. Improved catalytic performance suggests that multipoint covalent immobilization protocol adapted using hydrogel system could be tailored as microreactor for catalysis of profitable macromolecules.

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Funding

This research work was indigenously supported by The Karachi Institute of Biotechnology and Genetic Engineering (KIBGE), University of Karachi, Pakistan.

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Authors

Contributions

AA contributed in conceptualization, validation, formal analysis, investigation, writing- review & editing of research data, arranged resources, performed data curation and performed project administration. FS assisted in methodology, formal analysis and helped in writing the original first draft of the manuscript. SP contributed in validation of results and assisted in writing and editing of the final manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Afsheen Aman.

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The authors have no competing interests to declare.

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Aman, A., Shahid, F. & Pervez, S. Exploration of a three-dimensional matrix as micro-reactor in the form of reactive polyaminosaccharide hydrogel beads using multipoint covalent interaction approach. Biotechnol Lett 44, 299–319 (2022). https://doi.org/10.1007/s10529-022-03223-4

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  • DOI: https://doi.org/10.1007/s10529-022-03223-4

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