Immobilization of <i>Lactobacillus acidophilus</i> β-galactosidase on chitosan obtained from the shells of the African giant snail, <i>Achatina achatina</i>

Authors

  • Ferdinand C. Chilaka Department of Biochemistry, University of Nigeria, Nsukka
  • Arinze L. Ezugwu Department of Biochemistry, University of Nigeria, Nsukka
  • Emeka H. Oparaji Department of Biochemistry, University of Nigeria, Nsukka
  • Ozoemena E. Eje Department of Biochemistry, University of Nigeria, Nsukka

DOI:

https://doi.org/10.26538/tjnpr/v8i3.32

Keywords:

adaptation, immobilization, Achitina achatina, chitosan, properties, β-galactosidase, Lactobacillus acidophilus

Abstract

High enzyme activity and reusability are the major factors that limit enzyme application in the industry. This study explored the properties of Lactobacillus acidophilus β-galactosidase immobilized on Achatina chitosan, for improved enzyme reusability in industry. β-Galactosidase was produced from environmentally well-adapted Lactobacillus acidophilus. The enzyme was purified by ion exchange chromatography using DEAE-cellulose and had a molecular weight of 43kDa. Mg2+ was a major positive effector of the β-galactosidase activity. Chitin was extracted from Achatina shells by demineralization and deproteination, and deacetylated to chitosan. The chitin and chitosan yields were 74.64% and 58.60%. However, a hypochlorite-decolorized chitin, deacetylated to chitosan, gave a yield of 71%. FTIR spectra of chitin showed major bands at 711 cm-1, 855 cm-1, 1082 cm-1, and 1438 cm-1 for chitin and for chitosan at 6778 cm-1, 711 cm-1, 851 cm-1, 1082 cm-1 and 1436 cm-1. The β-galactosidase was immobilized on chitosan beads by adsorption and covalent linkage using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide (EDC/NHS), and glutaraldehyde, separately. The enzyme had optimal temperature and pH of 70°C and 5.5. The Michaelis-Menten constant (KM) and maximal velocity (Vmax) of the free and immobilized β-galactosidase were 0.262/0.251mM, and 270.27/290 μmol/min using p-NPG as substrate, and 0.53/10.02 mM and 250/275 μmol/min for lactose as substrate, respectively. Covalent immobilization by glutaraldehyde improved the β-galactosidase activity more than adsorption, in comparison to EDC/NHS. The results show that extracellular β-galactosidase from Lactobacillus acidophilus, isolated from dairy wastewater, can be immobilized on chitosan support produced using cheaply available Achatina shell chitosan for greater reusability.

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Published

2024-03-30

How to Cite

Chilaka, F. C., Ezugwu, A. L., Oparaji, E. H., & Eje, O. E. (2024). Immobilization of <i>Lactobacillus acidophilus</i> β-galactosidase on chitosan obtained from the shells of the African giant snail, <i>Achatina achatina</i>. Tropical Journal of Natural Product Research (TJNPR), 8(3), 6693–6699. https://doi.org/10.26538/tjnpr/v8i3.32

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