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    Surface-Engineered Biocatalytic Composite Membranes for Reduced Protein Fouling and Self-Cleaning

    Year: 2018

    Journal: ACS Appl. Mater. Interfaces, Volume 10, AUG 15, page 27477–27487

    Authors: Vanangamudi, Anbharasi; Saeki, Daisuke; Durnee, Ludovic F.; Duke, Mikel; Vasiljevic, Todor; Matsuyama, Hideto; Yang, Xing

    Organizations: Victoria India Institute via Victoria India Doctoral Scholarship; Deakin University; Victoria University

    Keywords: biocatalysts; ultrafiltration; enzymes; antifouling; nanofibers

    A new biocatalytic nanofibrous composite ultrafiltration membrane was developed to reduce protein fouling interactions and self-clean the membrane surface. The dual-layer poly(vinylidenefluoride)/nylon-6,6/chitosan composite membrane contains a hydrophobic poly(vinylidenefluoride) cast support layer and a hydrophilic functional nylon-6,6/chitosan nanofibrous surface layer where enzymes were chemically attached. The intrinsic surface chemistry and high surface area Mow. of the nanofibers allowed optimal and stable immobilization of trypsin (TR) and a-chymotrypsin enzymes via direct covalent binding. The enzyme immobilization was confirmed by X-ray photoelectron spectroscopy and visualized by confocal microscopy analysis. The prepared biocatalytic composite membranes were nanoporous with superior permeability offering stable protein antiadhesion and self-cleaning properties owing to the repulsive mechanism and digestion of proteins into peptides and amino acids, which was quantified by the gel electrophoresis technique. The TR-immobilized composite membranes exhibited 2.7-fold higher permeance and lower surface protein contamination with 3-fold greater permeance recovery, when compared to the pristine membrane after two ultrafiltration cycles with the model feed solution containing bovine serum albumin/NaCl/CaCl2. The biocatalytic membranes retained about 50% of the enzyme activity after six reuse cycles but were regenerated to 100% activity after enzyme reloading, leading to a simple and cost-effective water remediation operation. Such surface- and pore-engineered membranes with self-cleaning properties offer a viable solution for severe surface protein contamination in food and water applications.
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