Evaluation on performance of dead-end ultrafiltration membrane in fractionating tilapia by-product protein hydrolysate

• Published in: Separation and purification technology Vol. 195; pp. 21 - 29
• Main Authors: Roslan, Jumardi, Mustapa Kamal, Siti Mazlina, Md. Yunos, Khairul Faezah, Abdullah, Norhafizah
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 29-04-2018
• Subjects: Dead-end ultrafiltration; Fish protein hydrolysate; Operating parameters; Peptide transmission; Permeate flux; Tilapia by-product protein hydrolysate; Dead-end ultrafiltration; Permeate flux; Peptide transmission; Operating parameters; Fish protein hydrolysate; Tilapia by-product protein hydrolysate
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2017.11.020

•Fractionation of TB protein hydrolysate using dead-end ultrafiltration was performed.•The fractionation is highly influenced by stirring speed, pH, and salt concentration.•The best conditions was achieved at 600 rpm and pH 8 for both 10 and 5 kDa membranes.•Fractionation was successfully produced peptides with sizes lower than 1000 Da.
Conversion of tilapia by-products through enzymatic hydrolysis is a promising alternative to produce a fish protein hydrolysate (FPH). Tilapia by-product (TB) protein hydrolysate consists of peptide mixtures in various sizes. Recovery of small-sized peptides is increasingly becoming a priority due to their special characteristics, which can provide an excellent physiological functions. Ultrafiltration (UF) membrane is an effective and suitable tool for fractionating small size peptides in a large scale. The objective of this study was to evaluate the membrane performance based on the permeate flux and peptide transmission. The fractionation of TB protein hydrolysate was performed through a dead-end UF membrane (10 and 5 kDa) with the effect of stirring speed (0–600 rpm), pH (3, 5, 7, 8 and 9) and salt concentration (NaCl; 0 M, 0.2 M, 0.4 M, and 0.6 M) at varies pressure (1.0, 1.5, 2.0, 2.5 and 3.0 bar). It was found that the transmembrane pressure of 2.5 bar, stirring speed of 600 rpm, pH 8 and without addition of NaCl turned out to be the best parameters which gave permeate flux of 53 L/m2h (10 kDa) and 27 L/m2h (5 kDa), while for the peptide transmission, the value of 87.33% (10 kDa) and 36.11% (5kDa) was obtained. This study indicates that by adding salt, it has lowered the permeate flux and peptide transmission. Finally, through a well-controlled of operating and physicochemical parameters, it was possible to produce peptides with sizes lower than 1000 Da.