Abstract
The objective of this study was to develop a bioprocess for lactose hydrolysis in diverse dairy matrices, specifically skim milk and cheese whey, utilizing column reactors employing a core–shell enzymatic system featuring β-galactosidase fused to a Cellulose Binding Domain (CBD) tag (β-galactosidase-CBD). The effectiveness of reactor configurations, including ball columns and toothed columns operating in packed and fluidized-bed modes, was evaluated for catalyzing lactose hydrolysis in both skim milk and cheese whey. In a closed system, these reactors achieved lactose hydrolysis rates of approximately 50% within 5 h under all evaluated conditions. Considering the scale of the bioprocess, the developed enzymatic system was capable of continuously hydrolyzing 9.6 L of skim milk while maintaining relative hydrolysis levels of approximately 50%. The biocatalyst, created by immobilizing β-galactosidase-CBD on magnetic core-shell capsules, exhibited exceptional operational stability, and the proposed bioprocess employing these column reactors showcases the potential for scalability.
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Acknowledgements
We would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (grant no. 308515/2020-0, no. 306010/2021-6,) and Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) for the scholarships, and Universidade do Vale do Taquari – Univates, CNPq (grant no. 405688/2021-0) and FAPERGS (grant no. 19/2551-0001740-5, no. 20/2551-0000524-0, no. 22/2551-0000397-4 (Bioprocess and Biotechnology for Food Research Center—Biofood)) for the financial support granted for this research paper. We also thank Quatro G Pesquisa & Desenvolvimento Ltda for their support in the experiment.
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AG: Conceptualization, investigation, methodology, formal analysis, writing—original draft preparation, and writing—reviewing and editing. RS: Investigation, and methodology. GR: Conceptualization, methodology, formal analysis, writing—original draft preparation, and writing—reviewing and editing. JMC: Resources, and supervision. GV: Conceptualization, formal analysis, resources, supervision, writing—original draft preparation, and writing—reviewing and editing. CFVS: Conceptualization, investigation, methodology, formal analysis, resources, supervision, writing—original draft preparation, and writing—reviewing and editing.
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Gennari, A., Simon, R., Renard, G. et al. Lactose hydrolysis in packed-and fluidized-bed reactors using a recombinant β-galactosidase immobilized on magnetic core-shell capsules. Bioprocess Biosyst Eng 47, 263–273 (2024). https://doi.org/10.1007/s00449-023-02960-8
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DOI: https://doi.org/10.1007/s00449-023-02960-8