2.4- Dinitrophenylhydrazones liquid chromatography

Conditions for the separation of 2,4-dinitrophenylhydrazones by liquid-solid [69] and liquid-liquid chromatography [70] are described below. [Pg.148]

RETENTION TIMES OF 2,4-DINITROPHENYLHYDRAZONES OBTAINED WITH LIQUID-LIQUID CHROMATOGRAPHY... [Pg.149]

Fung, K. and D. Grosjean. 1981. Determination of nanogram amounts of carbonyls as 2,4-dinitrophenylhydrazones by high performance liquid chromatography. Anal. Chem. 53 168-171. [Pg.88]

Kuwata, K., M. Uerobi, and Y. Yamasaki. 1979. Determination of aliphatic and aromatic aldehydes in polluted airs as their 2,4-dinitrophenylhydrazones by high performance liquid chromatography. J. Chromatogr. Sci. 17 264-268. [Pg.91]

Formation of 2,4-dinitrophenylhydrazones of carbonyl compounds is a popular method for their derivatization. However, owing to low volatility of these derivatives, their reversed-phase high-performance liquid chromatography (HPLC) analysis seems more preferable than GC analysis. ... [Pg.311]

Liquid-liquid partition chromatography. The stationary phase consists of 1% tris(2-cyanoethoxy)propane (TCEP) on Zipax support. The mobile phase, hexane, is saturated with TCEP prior to use. A pre-column consisting of 30% TCEP on Gas-Chrom Q is used in order to prevent stripping of the liquid phase from the analytical column. The detector is set at 254 nm for monitoring the column effluent. The retention times of a number of 2,4-dinitrophenylhydrazones obtained with this system are given in Table 4.12. Gradient elution may be made with Permaphase ETH as stationary material and a gradient of hexane-chloroform. The limit of detection is ca. 5 ng per injection. [Pg.148]

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