3 4 dihydroxyphenylacetic acid/dichloromethane

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Mass spectrometry of biogenic catecholamine ion pairs by direct liquid introduction.

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The mass spectrometry of ion pairs of dopamine, noradrenaline and 3,4-dihydroxyphenylacetic acid with n-octylsulphonate has been investigated by direct liquid introduction in an acidic buffer currently used for their high-performance liquid chromatographic separation. In order to follow the fate of

Hydrophilic interaction chromatography combined with dispersive liquid-liquid microextraction as a preconcentration tool for the simultaneous determination of the panel of underivatized neurotransmitters in human urine samples.

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A simple and sensitive method using dispersive liquid-liquid microextraction (DLLME) followed by liquid chromatography coupled to mass spectrometry (LC-MS) with a hydrophilic interaction chromatography (HILIC) column was developed for the simultaneous determination of 13 compounds of different

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Herbal & Natural Medicine

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