This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. Recovery of catechin and epicatechin from sago waste effluent. Supercritical CO 2 desorption of catechin and epicatechin from activated carbon. Adsorption of catechin and epicatechin in binary system.
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b s t r a c tThe recovery of valuable phenolic compounds (catechin and epicatechin) from sago waste effluent by activated carbon adsorption was studied in this work. Single and binary component of catechin and epicatechin was studied in static mode using synthetic effluent. Langmuir model was applied to evaluate the adsorption equilibrium data in single system. In binary system, the modified extended Langmuir model by inclusion of surface coverage was used to represent the adsorption data. All experimental data were well represented either by Langmuir model or its modified form. For kinetic study, it was found that pseudo-second order model represents the experimental data better than pseudo-first order model. Adsorption study using real sago waste effluent indicated that activated carbon adsorption process is promising for recovery of valuable phenolic compounds. Supercritical CO 2 extraction of phenolic compounds from activated carbon resulted in low recovery. The addition of ethanol as co-solvent significantly enhanced the desorption of catechin and epicatechin from activated carbon.
The extraction of phytochemicals from Mimosa pudica Linn (MPL) using supercritical CO 2 has been studied and the results are presented in this paper. The significant variables affecting this extraction were investigated by DOE analysis. The effect of temperature and pressure on phytochemical yields was explored by measuring total phenolic compound (TPC), total flavonoid content (TFC), and total alkaloid compound (TAC).The maximum yield of TPC, TFC, and TAC extracted from MPL were 74.83 mg GAE/gram dry MPL, 30.93 mg QE/gram dry MPL and 14.23 mg HE/gram dry MPL, respectively. The work of Chrastil was used to correlate the experimental data. It was found that temperature and pressure greatly affected the yield of phytochemicals, whereas the effect of extraction time on the extraction yield diminished after 2h. Qualitative analysis of the phytochemicals extracted from MPL was performed by High Performance Liquid Chromatography (HPLC).The SC-CO 2 extraction was more selective than soxhlet extraction based on the HPLC spectra.
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