02485nab a2200265 i 4500 publ38856 20260127133053.0 260127s2026 hu o 000 eng d 2673-4079 10.3390/suschem7010001 doi 36847176 mtmt SZTE Publicatio Repozitórium hun eng Dobozi Réka Investigating the Separation Efficiency of Ultrafiltration/Diafiltration (UF/DF) of Whey by Dielectric Measurements [elektronikus dokumentum] / Dobozi Réka 2026 22 SUSTAINABLE CHEMISTRY 7 No. 1 In whey valorization, membrane separation stands out as a highly effective technique for purifying and isolating the various components of whey. The efficiency of whey ultrafiltration and diafiltration (UF/DF) largely depends on the balance between membrane selectivity, hydrodynamic conditions, and solute interactions at the membrane interface. In this study, sweet whey was fractioned using 10, 30 and 50 kDa polyether sulfone (PES) membranes under identical transmembrane pressure (TMP = 2.5 bar) with ultrafiltration and a subsequent 4-step constant volume diafiltration stages. The resulting compositional and dielectric changes were evaluated to identify optimal separation conditions and assess the applicability of dielectric parameter measurement as a rapid, non-destructive monitoring technique. Results showed that, regardless of the applied molecular weight cut-off (MWCO), using three DF cycles can wash out almost all the removable lactose from the retentates, and the dielectric assessment of both permeate and retentate fractions showed a strong, linear relationship between the change in dielectric behavior and the composition of each fraction. Analysis of the dielectric spectra confirmed that the ratio of the dielectric constant to the loss factor (ε′/ε″) exhibited a strong linear correlation (R2 > 0.98, r > 0.99) with lactose concentration in the permeate fractions of all three MWCO membranes, as well as a similarly strong correlation (R2 > 0.975, r > 0.98) with the total chemical oxygen demand (TCOD) measured in the retentate fractions. Kémiai tudományok Jákói Zoltán Péter aut Beszédes Sándor aut Szabó P. Balázs aut Kertész Szabolcs aut http://publicatio.bibl.u-szeged.hu/38856/1/suschem-07-00001-v3.pdf Dokumentum-elérés