Marinated herring processing brines, which are usually discarded, are rich in salt, protein, non-protein nitrogen, iron, fatty acids, antioxidant and even possess enzymatic activity. This study investigated the performance of ceramic ultrafiltration of two herring spice brines with a major focus on recovery of high value biomolecules such as proteins, fatty acids, minerals, and phenolic compounds. Chemical and biological oxygen demand (COD, BOD5) as well as total suspended solids (TSS) were also measured to follow the performance of the ultrafiltration. The retentates contained 75-82% (95% TSS and >85% iron was obtained using the ceramic membranes. The two permeates generated were both fat-free and contained approx. 2% of the proteins compared to the unfiltered brines, and the retention of the phenolic compounds were ranged from 0 to 39%. The results presented in this work demonstrate that ceramic ultrafiltration can recover biomolecules from marinated herring brines although pre-filtration optimization is still needed.
L W T- Food Science and Technology, 2015, Vol 63, Issue 1, p. 423-429
Ultrafiltration; Recovery; Biomolecules; Brine; Clupea harengus; Biochemical oxygen demand; Brines; Ceramic materials; Chemical oxygen demand; Fatty acids; Filtration; Iron compounds; Molecular biology; Nitrogen; Phenols; Proteins; Chemical and biologicals; Enzymatic activities; Nitrogen concentrations; Phenolic compounds; Total suspended solids; Ceramic membranes