Separation and purification of epigallocatechin-3-gallate (EGCG) from green tea using combined macroporous resin and polyamide column chromatography

Tannase from Aspergillus melleus improves the antioxidant activity of green tea: purification and biochemical characterisation

“…which increases gallic acid concentration, consistent with previous research (Jin et al, 2015). Among the medicinal properties of green tea, its antioxidant activity deserves further attention.…”

“…This increase in antioxidant potential may be attributed to high amounts of gallic acid, which is produced during the final stage of hydrolysis. During this final stage, hydrolysable tannins present in green tea are hydrolysed, which increases gallic acid concentration, consistent with previous research (Jin et al ., ). Among the medicinal properties of green tea, its antioxidant activity deserves further attention.…”

Recovery of phenols from autohydrolysis liquors of barley husks: Kinetic and equilibrium studies

“…The values of the regression coefficient (Table 1) were almost equal to unity for all the three concentration of phenolic compounds, suggesting that the sorption kinetics of phenols followed a pseudo-second order process. The pseudo-second order model was also reported by other workers to predict the kinetics of phenols sorption (Abdullah et al, 2009;Gao et al, 2013;Jin et al 2015;Liu et al, 2012). The Elovich equation can be expressed by equation (7):…”

“…Monsanto et al (2015) found equilibrium time of 2 h for theaflavins and caffeine from black tea. The equilibrium time for genistein and apigenin from extracts of pigeon pea roots was 3.5 h and 3 h, respectively (Liu et al, 2010), for licorice flavonoids and glycyrrhicid acid from licorice roots was about 4 h (Fu et al, 2005), for vitexin and isovitexin from pigeonpea extracts about 2 h (Fu et al, 2007), and for EGCG from green tea was 3 h (Jin et al, 2015). The adsorption capacity of rosavin increased with the adsorption time and reached equilibrium after 80 min .…”

“…Thus, the adsorption process is preferred because it is a low-cost separation technique, applicable for industrial scale processes, with high adsorption capacities, possible recovery of the adsorbed molecules and easy regeneration (Abdelkreem, 2013;Kammerer et al, 2011;Soto et al, 2011). Resins have been applied for the adsorption of phenolic compounds and hydroxytyrosol from olive oil mill wastewater (Agalias et al, 2007;Frascari et al, 2016;Petrotos et al, 2016Petrotos et al, , 2013, hydroxytyrosol and tyrosol from fermentation brine wastewater (Ferrer-Poloniom et al, 2016), spinacetin and patuletin from spinach leaves (Aehle et al, 2004), polyphenols from kiwifruit juice (Gao et al, 2013), limonin and naringin from orange juice (Ribeiro et al, 2002), hesperidin from orange peel (Di Mauro et al, 1999), anthocyanins from roselle (Chang et al, 2012), narirutin from a water-extract of Citrus unshiu peels (Kim et al, 2007), genistein and apigenin from extracts of pigeon pea roots (Liu et al, 2010), anthocyanins and hydroxycinnamates from orange juice (Scordino et al, 2005), chlorogenic acid and apigenin-7-O-glucoside from artichoke wastewaters (Conidi et al, 2015), catechin, epicatechin, epicatechin gallate, epigallocatechin gallate and caffeine from green tea (Jin et al, 2015; MARK 2016), catechins and theaflavins from black tea (Monsanto et al, 2015). The study of plant extracts is complex due to the interactions of other plant constituents, which could has an impact on phenolic binding (Bretag et al, 2009;Kammerer et al, 2010).…”