Electromigration feasibility of green tea catechins

Effect of process unit operations and long-term storage on catechin contents in EGCG-enriched tea drink

“…and solvents were water + 0,05% trifluoroacetic acid (TFA, purity >99%, Laboratoire MAT, Québec, QC, Canada) for phase A and acetonitrile (HPLC grade, EMD Chemicals Inc., Gibbstown, NJ, USA) + 0.05% TFA for phase B. All other parameters of the HPLC method were the same as those used by Labbé, Araya-Farias, Tremblay, and Bazinet (2005) which were based on the National Institute of Standards and Technology method (Dalluge, Nelson, Thomas, & Sander, 1998).…”

Fouling behavior of aqueous solutions of polyphenolic compounds during ultrafiltration

“…Membrane-based technologies can provide interesting alternatives. Labbe et al (2005) have recently proposed the use of electrodialysis for separation of phenolic catechin compounds from tea brews. Ultrafiltration (UF) has also been proposed for the separation of polyphenolic compound (Gökmen et al, 2003;D'Alvise et al, 2000;Decloux et al, 2000;Borneman et al, 1997;Nawaz et al, 2006).…”

Improved peptide fractionation by electrodialysis with ultrafiltration membrane: Influence of ultrafiltration membrane stacking and electrical field strength

“…A conventional electrodialysis cell is used, in which some ion-exchange membranes are replaced by ultrafiltration ones so that compounds of higher molecular weights can be separated. The first tested applications were pursued to isolate polyphenols from tobacco extract [1] and from green tea infusion [2]. More recently, the use has been extended by Poulin et al [3,4] to the selective fractionation of bioactive peptides from a ␤-lg tryptic hydrolysate and more precisely for the isolation of the anti-hypertensive and cationic peptide ␤-lg 142-148: a total transmission of 10.8% and an average relative concentration of 25% were reached when working with a feed solution adjusted at pH 5.…”