Protein immobilization on glutaraldehyde activated nylon membranes: effects of the activation condition
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Date
2017-06
Authors
Nur Hafizah Binti Abd Halil
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Abstract
Protein immobilization on glutaraldehyde (GA) activated nylon membranes
has been studied in this work. Nylon membranes was first activated with GA and
then immobilized with the protein. The morphology of the membranes was
characterized by scanning electron microscopy (SEM), FTIR analysis and
thermogravimetric analysis (TGA) to check the presence of glutaraldehyde. The
preliminary study was carried out to investigate the effect of three factors (incubation
time, pH and concentration of GA) on protein binding while the membrane sample is
fixed to 16 wt% of nylon polymer and 84 wt% of mixture solvent and non-solvent.
From the study, it can be found that the optimum condition of GA-activation which
are incubation time is at 40 min, at pH 7.5 and 1 wt% of GA concentration. Since the
mixture factors (concentration of polymer and mixture solvent and non-solvent) and
process factors (incubation time and pH) were inter-related, therefore Design of
Experiment (DoE) was applied. The optimum GA-activation conditions was
obtained from a crossed mixture-process design methodology (Design of
Experiment) at 25 wt% of nylon polymer, 75 wt% of mixture solvent and non- solvent, GA solution at pH 9.0 and GA activation time of 70 min, with protein
binding predicted at 2410.19 µg/cm3
. The experimental validation was conducted at
this optimum condition and the protein binding result was found at 2411.57 µg/cm3
with the standard deviation of 0.057%. The experimental result shown a small
standard deviation which means the model can be used further to predict the protein
that immobilized on glutaraldehyde activated nylon membranes.