Concentration of whey protein from cheese whey effluent using ultrafiltration by combination of hydrophilic metal oxides and hydrophobic polymer

Abstract

BACKGROUND In this study, hydrophilic metal oxides such as TiO2, ZrO2 and ZnO were used as modifier for the preparation of polyethersulfone (PES) mixed matrix membranes (MMMs) for the filtration of cheese whey effluent. Nano metal oxide loading concentration was varied from 0.5 to 2.5 wt%. RESULTS Characterization of metal oxide studies show that the particles are hydrophilic and nanoscaled. ZnO nanoparticles are in the form of nanocluster and of size 14.28–20.10 nm. Physio‐chemical characterization of PES MMMs indicated that the nano metal oxides dispersed well in the PES matrix. Contact angle decreased up to 59.88° for 1.5 wt% TiO2 embedded PES (TiO2ePES) MMMs. Also, 1.5 wt% TiO2ePES MMMs gives a higher water permeability of 4.62 × 10–7 m s–1 kPa–1. Among membranes, 1.5 wt% TiO2ePES, 2.0 wt% ZrO2ePES and 1.5 wt% ZnOePES MMMs showed better flux, lower percentage fouling and better rejection for individual whey proteins. CONCLUSION The whey protein from cheese whey effluent was concentrated up to maximum of 43.9 mg L–1 using 2.0 wt% ZrO2ePES MMMs. It was found that 1.5 wt% TiO2ePES MMMs gives a higher average flux of 25.09 L m–2 h–1 and a lower flux reduction percentage of 39%. © 2018 Society of Chemical Industry

Recent Advancements of UF-Based Separation for Selective Enrichment of Proteins and Bioactive Peptides—A Review

“…Adjustment of pH would allow better selectivity as performed in a work that at pH 7.2, membrane was 50% more selective than at pH 3.2, of which this finding was supported by other researches [187,188]. [189][190][191] and (b) from [186,188].…”

“…In this paper, we gathered distinguished examples of how operating parameters play a role to control fouling and concentration polarization, i.e., protein concentration, pH, and ionic strength (salt concentration) by modulating protein-protein and protein-surface interactions, and TMP toward hydrodynamics. Owing to the unique findings resulted from different types of protein sources, the discussion of each operating parameters will be divided into ma- [189][190][191] and (B) from [186,188].…”

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