4.3 Article

Ultrasound-assisted swelling of bacterial cellulose

Journal

ENGINEERING IN LIFE SCIENCES
Volume 17, Issue 10, Pages 1108-1117

Publisher

WILEY
DOI: 10.1002/elsc.201700085

Keywords

Bacterial cellulose; PEG-FITC; Polymerization; Swelling; Ultrasound

Funding

  1. European Regional Development Fund under scope of Norte2020 - Programa Operacional Regional do Norte [UID/BIO/04469/2013, POCI-01-0145-FEDER-00668, NORTE-01-0145-FEDER-000004]
  2. Ministry of Education [2015R1D1A1A01060747]
  3. European Union Horizon 2020 research and innovation programme [NMP-06-2015-683356 FOLSMART]

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Bacterial cellulose (BC) was obtained by static cultivation using commercial BC gel from scoby. BC membranes (oven dried and freeze-dried) were swelled with 8% NaOH, in the absence and in the presence of ultrasound (US), for 30, 60, and 90 min. The influence of swelling conditions on both physico-chemical properties and molecules entrapment was evaluated. Considering the highest levels of entrapment, an optimum swelling procedure was established: 8% NaOH for 30min at room temperature in the presence of US. Native and PEGylated laccase from Myceliophthora thermophila was immobilized on BC membranes and a different catalytic behaviour was observed after immobilization. Native laccase presented activity values similar to published reports (5-7U/gBC) after immobilization whereas PEGylated enzymes showed much lower activity (1-2U/gBC). BC swelled membranes are presented herein as a potential support for the preparation of immobilized enzymes for industrial applications, like phenolics polymerization.

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