Terabe

S. Terabe, Electrokinetic cliromatography an interface between electrophoresis and chromatography . Trends Anal. Chem. 8 129-134 (1989). 

Watanabe, T. and Terabe, S., Analysis of natural food pigments by capillary electrophoresis, J. Chromatogr. A, 880, 311, 2000. 

Terabe, S., Nishi, H., and Ando, T., Separation of cytochromes c by reversed-phase high-performance liquid chromatography, J. Chromatogr., 212, 295,1981. 

Terabe, S., Otsuka, K., and Ando, T., Band broadening in electrokinetic chromatography with micellar solutions and open-tubular capillaries, Anal. Chem., 61, 251, 1989. 

Terabe, S., Yashima, T., Tanaka, N., and Araki, M., Separation of oxygen isotopic benzoic acids by capillary zone electrophoresis based on isotope effects on the dissociation of the carboxyl group, Anal. Chem., 60,1673, 1988. 

Nishi, H. and Terabe, S., Application of micellar electrokinetic chromatography to pharmaceutical analysis, Electrophoresis, 11, 691, 1990. 

Miyashita, Y., Terabe, S., and Nishi, H., Separation of antibiotics and corticosteroids by MECC, Appl. Brief DS-766, Beckman Instruments, Fullerton, CA,... 

Jia, L., Liu, B., Terabe, S., Nishioka, T. (2004). Two-dimensional separation method for analysis of bacillus subtilis metabolites via hyphenation of micro-liquid chromatography and capillary electrophoresis. Anal. Chem. 76, 1419-1428. 

QUIRINO, J.P., TERABE, S., Sample stacking of fast-moving anions in capillary zone electrophoresis, J. Chromatogr., A., 1999, 850, 339-344. 

In order to separate neutral compounds, Terabe et al. [13] added surfactants to the buffer electrolyte. Above their critical micellar concentration (cmc), these surfactants form micelles in the aqueous solution of the buffer electrolyte. The technique is then called Micellar electrokinetic capillary chromatography, abbreviated as MECC or MEKC. Micelles are dynamic structures consisting of aggregates of surfactant molecules. They are highly hydrophobic in their inner structure and hydrophilic at the outer part. The micelles are usually... 

Numerous CE separations have been published for synthetic colours, sweeteners and preservatives (Frazier et al., 2000a Sadecka and Polonsky, 2000 Frazier et al., 2000b). A rapid CZE separation with diode array detection for six common synthetic food dyes in beverages, jellies and symps was described by Perez-Urquiza and Beltran (2000). Kuo et al. (1998) separated eight colours within 10 minutes using a pH 9.5 borax-NaOH buffer containing 5 mM /3-cyclodextrin. This latter method was suitable for separation of synthetic food colours in ice-cream bars and fmit soda drinks with very limited sample preparation. However the procedure was not validated for quantitative analysis. A review of natural colours and pigments analysis was made by Watanabe and Terabe (2000). Da Costa et al. (2000) reviewed the analysis of anthocyanin colours by CE and HPLC but concluded that the latter technique is more robust and applicable to complex sample types. Caramel type IV in soft drinks was identified and quantified by CE (Royle et al., 1998). 

Relatively simple spectra are obtained from spin adducts of the hindered nitroso-arenes, and these may be further refined by deuteration of the spin trap (Terabe et al., 1973). In spite of being substantially dimerized, even in dilute solution,6 nitrosodurene (ND) has two considerable advantages over MNP. Firstly, it is more reactive towards radical addition (Table 5, p. 33). Secondly, it is not sensitive to visible light, and even on ultraviolet irradiation any photodecomposition is apparently not a major source of nitroxides. 

The tri-t-butylnitrosobenzene, TNB, is monomeric even in the solid state, but the principal advantage of this scavenger, exemplified in the mechanistic studies described in Section 3 (p. 47), is that it functions as an ambident spin trap (Terabe and Konaka, 1973). Thus, primary alkyl radicals add to form nitroxides in the normal way, but with t-alkyl radicals, addition occurs at oxygen, alkoxyaminyl radicals (ArNOR) being formed. Secondary alkyl radicals give mixtures of both species (Fig. 5). The alkoxyaminyl radicals have a lower g-value than the nitroxides (ca. 2.004 vs. 2.006) and their spectra are therefore centred at slightly higher field positions than those of the nitroxides. 

Flo. S Superimposed spectra of nitroxide and oxyaminyl radicals formed by scavenging isopropyl radicals by TBN (Terabe and Konaka, 1971). Note oxyaminyl radical (g2) centred upfield from nitroxide (g2) reflecting its lower g-factor... 

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