References
- Lister , J.H. 1996 . The Chemistry of Heterocyclic Compounds Vol. 54 , 254 New York : Wiley .
- Shen , F. , Yuan , W. and Zhang , G. 2001 . Clinical applications of pentoxifylline for kidney diseases . Chin. J. New Drugs Clin. Remark , 20 ( 2 ) : 146 – 148 . (in Chinese)
- Qian , T. , Liu , W. and Li , L. 1990 . Adsorption Resin and Its Applications 617 pp Beijing : Chem. Ind. Press . (in Chinese)
- Kurata , H. , Kawai , A. , Seki , M. and Furusaki , S. 1994 . Increased alkaloid production in a suspension culture of coffea aarabica cells using an adsorption column for product removal . J. Ferment. Bioeng. , 78 ( 1 ) : 117 – 119 .
- McHugh , M. and Krukonis , V. 1994 . Supercritical Fluid Extraction, Principles and Practice , 2nd Ed. Vol. Boston , 4 pp Butterworth-Heinemann .
- Johannsen , M. and Brunner , G. 1994 . Solubilities of the xanthines caffeine, theophlline and thoebromine in supercritical carbon dioxide . Fluid Phase Equilibria , 95 : 215 – 226 .
- Saldana , M.D.A. , Mohamed , R.S. and Mazzafera , P. 2000 . Supercritical carbon dioxide extraction of methylxanthines from mate tea leaves . Braz. J. Chem. Eng. , 17 ( 3 ) : 251 – 259 .
- Li , S. and Hartland , S. 1996 . New industrial process for extracting cocoa butter and xanthine with supercritical carbon dioxide . J. Am. Oil Chem. Soc. , 73 ( 4 ) : 423 – 429 .
- Wang , T. 2001 . “ Supercritical fluid extraction ” . In Handbook of Solvent Extraction Edited by: Wang , J. and Chen , G. 1020 – 1022 . Beijing : Chem. Ind. Press . (in Chinese)
- Hu , X. , Dai , W. , Wang , X. , Guo , Z. , Liao , B. and Bai , R. 1995 . Study of extraction process of caffeine by chloroform . J. Tsinghua Univ. (Sci. Technol.) , 35 ( 3 ) : 13 – 19 . (in Chinese)
- Hamm , W. 1992 . “ Liquid–Liquid extraction in food processing ” . In Science and Practice of Liquid–Liquid Extraction Edited by: Thorton , J.D. Vol. 2 , 334 – 337 . Oxford : Clarendon Press .
- Hu , X. 1999 . Recovery of theophylline in effluent with 2-ethylhexanol extraction process . Sep. Sci. Technol. , 34 ( 14 ) : 2905 – 2922 .
- Hu , X. 1997 . Recovery of chloroform from effluent with solvent-distillation process . Sep. Sci. Technol. , 32 ( 12 ) : 2039 – 2050 .
- Lo , T.C. , Baird , M.H.I. and Rama , R.N.V. 1992 . The reciprocating plate column-development and applications . Chem. Eng. Commun. , 116 ( 67 ) : 66 – 88 .