3Ni Y N, Zhang G W, Kokot S. Simultaneous spectrophotometric determination of mahol, ethylmahol, vanillin and ethylvanillin in foods by multivariate calibration and artificial neural rletworks[J]. Food Chemistry, 2005, 89(3): 465-473.
4Lowri S L S de Jager, Gracia A G A P, Gregory W G W D. Deter- mination of coumarin, vanil lin, and ethyl vanillin in vanilla ex- tract products: liquid chromatography mass spectrometry method development and validation studies[J]. Journal of Chromatography A, 2007, 1 145( 1-2): 83-88.
5Jager D E, Lowri S, Perfetti G A, et al. Comparison of head space- SPME-GC-MS and LC-MS for the detection and quantifi cation of coumarin, vanillin, and ethyl vanillin in vanilla extract products [J]. Food Chemistry, 2008, 107(4): 1 701-1 709.
6Low K H, Sorensen E. Optimal operation of extractive distillation in different batch configurations[J]. AICHE J, 2002, 48:1 034- 1 050.
7Hilal N, Yousef G. Operating parameters effect on methanol-ace- tone separation by extractive distillation separ[J]. Sci Tech, 2002, 37:3 291-3 303.
