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- W2118435268 abstract "MethytMknic sdd (MMA) and 801118 shortdaln dlcarboxyk acids were derivatized with the fluorescent iabellng reagent l-pyrenyldlazomethane (PDAM) in an aqueous matrix. The derivatization of MMA and ethyimaionic acid (EMA) proceeded and leveled otf rapklly at bw pH, whefeas at akallne pH, the fluorescent derivative was progrdvely fmed over a perkd of more than 24 h, and ~fiuorescence ylekl was obtained. The PDAM esters of MMA and EMA had an excitatbn maximum at 340 nm and emlsdon mama at 376 and 395 MI. They wem stable for days h aqueous media at room temperature. The MMA derivative was Identified as l-pyrenybnethyl methyhralonate monoester by mass spectrometry, and formation of l-pyrenyimethyl methylmaionate diester could not be demonstrated. The free carboxylk acid moiety and the ionization of this group may explain the unlque chromatographic properties of the MMA derivative, 1.e. a marked increase in the capacity factor In a reversed-phase system by decreashg the pH of the moblle phase. The MMA derivatlve was separated from PDAM esters of several other short-chain dicarboxylic acids by a acetonitrile gradlent in formate buffer, pH 2.5. These data may form the basls for the construction of automated MMA assays involving derive tkatkn In aqueous media followed by liquid chromatography." @default.
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- W2118435268 date "1992-02-01" @default.
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- W2118435268 title "Formation in an aqueous matrix and properties and chromatographic behavior of 1-pyrenyldiazomethane derivatives of methylmalonic acid and other short-chain dicarboxylic acids" @default.
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- W2118435268 doi "https://doi.org/10.1021/ac00027a013" @default.
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