Cabrera MP, Assis CRD, Neri DFM, Pereira CF, Soria F, Carvalho LB. High sucrolytic activity by invertase immobilized onto magnetic diatomaceous earth nanoparticles.
ACTA ACUST UNITED AC 2017;
14:38-46. [PMID:
28480172 PMCID:
PMC5406527 DOI:
10.1016/j.btre.2017.03.001]
[Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 03/25/2017] [Accepted: 03/29/2017] [Indexed: 11/26/2022]
Abstract
Innovative biocatalyst with good properties to produce invert sugar.
mDE-APTES-invertase showed 92.5% of residual specific activity.
High sucrolytic activity (3358 U mg−1 protein) by mDE-APTES-invertase was obtained.
Remarkable results of thermal and storage stability, and reuse for mDE-APTES-invertase were found.
Invertase immobilized on magnetic diatomaceous earth nanoparticles (mDE-APTES-invertase) with high sucrolytic activity was obtained by an easy and low-cost method. An experimental design was carried out to investigate the best immobilization conditions and it allowed obtaining an immobilized derivative with a residual specific activity equal to 92.5%. Then, a second experimental design selected the mDE-APTES-invertase with higher specific activity in relation to other derivatives reported in the literature (2.42-fold). Thermal and storage stability for immobilized invertase were found to be 35 °C for 60 min (85% retained activity) and 120 days storage period (80% retained activity), respectively. Besides, a residual activity higher than 60% and 50% were observed for mDE-APTES-invertase after reuse in short and long term, respectively. Given the simple and efficient method to obtain an immobilized derivative with high activity, the mDE nanoparticles appear to be a promising matrix for invertase immobilization as well as for other biomolecules.
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