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Development Of 7-(N,N-dimethylaminosulfonyl)-5-N-(4-N-aminoethyl)piperazino-2,1,3-benzoxadiazole As A Water-soluble Fluorogenic Reagent For The Sensitive Liquid Chromatographic Determination Of Saturated Carboxylic Acids.

C. Huang, T. Santa, K. Imai
Published 2002 · Chemistry, Medicine

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A reversed-phase high-performance liquid chromatographic (HPLC) method for the femtomole determination of nine saturated carboxylic acids, n-butyric (C4), n-hexanoic (C6), n-caprylic (C8), n-decanoic (C10), lauric (C12), n-tetradecanoic (C14), palmitic (C16), stearic (C18) and arachidic (C20), based on the condensation reaction of these acids with a newly synthesized water-soluble benzofurazan fluorescent reagent, 7-(N,N-dimethylaminosulfonyl)-4-N-(4-N-aminoethyl)piperazino-2,1,3-benzoxadiazole (DBD-PZ-NH2), was developed. The derivatization reaction proceeds with 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide (EDC) in the presence of the catalyst 4-(dimethylamino)pyridine (DMAP). A model derivative of the reagent with n-caprylic acid (C8) was synthesized for fluorescence excitation/emission characterization. Depending on the solvents, including water, methanol, acetonitrile, 1,4-dioxane or N.N-dimethyformamide (DMF), the C8 derivative has a fluorescence emission with a fluorescence quantum yield (phi) ranging from 0.01 to 0.20 in the region from 545 to 580 nm. An exponential increase in phi was observed with increasing acetonitrile content. The calculated detection limits (signal-to-noise ratio = 3:1) of the proposed method for the above nine carboxylic acids were 9.1, 4.0, 2.5, 2.2, 2.0, 1.8, 1.2, 1.0 and 1.3 fmol, respectively. Biological samples including Intralipos 20% and rat plasma were analysed satisfactorily.
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