title: The batch adsorption of the epigallocatechin gallate onto apple pomace.
abstract: The ability of apple pomace for carrying a polyphenol (epigallocatechin-3-gallate, EGCG) was examined. The adsorption characteristics of epigallocatechin gallate onto apple pomace from aqueous solution were determined over a range of concentrations (25-600 mg/L) and temperatures (25, 40 and 55 °C). The adsorption of EGCG decreased with increasing temperature. Both the Langmuir and Freundlich models adequately describe the isothermal adsorption of EGCG onto apple pomace. The Gibbs free energy change (ΔG°) for the adsorption of EGCG onto apple pomace ranged from -15.90 to -22.98 kJ/mol over the temperature range 25-55 °C, indicating the adsorption of EGCG onto apple pomace is a spontaneous process, and further that the adsorption process is likely to be dominated by a physisorption mechanism. Our results show that apple pomace has good adsorption characteristics, suggesting that apple pomace may be a useful EGCG carrier for functional food applications.
authors.affiliation: College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 35002, China; CSIRO Animal, Food and Health Sciences, Werribee, VIC 3030, Australia.
authors.forename: Liangyu
authors.initials: L
authors.lastname: Wu
authors.affiliation: CSIRO Animal, Food and Health Sciences, Werribee, VIC 3030, Australia; School of Chemical Sciences, The University of Auckland, Auckland 1142, New Zealand.
authors.forename: Laurence D
authors.initials: LD
authors.lastname: Melton
authors.affiliation: CSIRO Animal, Food and Health Sciences, Werribee, VIC 3030, Australia.
authors.forename: Luz
authors.initials: L
authors.lastname: Sanguansri
authors.affiliation: CSIRO Animal, Food and Health Sciences, Werribee, VIC 3030, Australia. Electronic address: maryann.augustin@csiro.au.
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: Augustin
mesh_terms: D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry; D005638:Fruit / Q000737:chemistry*; D027845:Malus / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D002392:Catechin; C045651:epigallocatechin gallate
keywords: Adsorption; Apple pomace; Epigallocatechin-3-gallate; Isotherm; Polyphenol