“…In most cases, due to the physicochemical properties of this group of compounds, analytical procedures include derivatization step. Frequently used as a derivatization reagents are such derivatives of hydrazine as: 2,4-dinitrophenylhydrazine (DNPH) [5,12,17,21], 2,4,6-trichlorophenylhydrazine (TCPH) [20], 2,3,4,5,6-pentafl uorophenylhydrazine (PFPH) [14], 5-(dimethylamino)-naphthalene-1-sulfon-hydrazide (DNSH) [19], 3-methylbenzothiazole-2-hydrazine (MBTH) [11], 4-(N.N-dimethylaminosulfonyl)-7-N-methylhydrazino-2,1,3-benzoxadiazole (MDBDH) [9], 5-amino-4-sulfanylphthalhydrazide (ASPH) [8], hydroxylamine derivatives (O-benzylhydroxylamine (BOA) [10], o- (2,3,4,5,6-pentafl uorobenzyl)-hydroxylamine (PFBHA) [15], Hantzscha reagents (1,3-cykloheksadion (CHD), 5,5-dimethyl-1,3-cykloheksadion (Dimedon), 4-amino--3-penten-2-one (Fluoral P), acetylacetone, acetoacetanilid or 2-aminoethanethiol (cysteamine), 3-amonofl uoroethan [6,22]. DNPH is the commonly used derivatization agent for high performance liquid chromatography (HPLC), whereas PFBHA is usually used for gas chromatography.…”