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The solid-phase microextraction (SPME) technique was evaluated for the determination of 23 carbonyl compounds in water. The carbonyl compounds in water were derivatized with omicron-(2,3,4,5,6-pentafluorobenzyl)-hydroxylamine hydrochloride (PFBHA), extracted with SPME from liquid or headspace and analyzed by GC with electron capture detection (GC-ECD). The(More)
OBJECTIVE To study the chemical constituents of Mongolian medicine Halenia corniculata. METHODS Positive phase and reversed phase silica gel, as well as Sephadex LH-20 methods were used to separate and purify. The structure of the isolated constituents was identified according to the NMR spectroscopy data and the literature data. RESULTS Nine compounds(More)
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