@article{ref1,
title="Determination of Malathion Metabolites in Biological Samples by LC/MS",
journal="Japanese Journal of Toxicology and Environmental Health",
year="1994",
author="Katagi, M. and Tsuchihashi, H. and Tatsuno, M.",
volume="40",
number="4",
pages="357-364",
abstract="The procedure for the determination of the main metabolites of malathion (MA), malaoxon (MO), malathion dicarboxylic acid (DCA), malathion α, β-monocarboxylic acid (α, β-MCA), desmethyl malathion (DM-MA), in addition to unchanged MA was investigated using positive-ion mode thermospray liquid chromatography-mass spectrometry (TSP-LC/MS). Following the solid-phase extraction of the sample at pH 2 using Sep-Pak C18 cartridge with methanol as eluent, the extract was analyzed on TSP-LC/MS. LC analyses were performed on C18-bonded phase using methanol-100 mM ammonium acetate (60: 40 v/v, pH 3.65 with trifluoro acetic acid) as eluent at a flow rate of 1.0 ml/min. Every mass spectrum of MA and its metabolites provided both the protonated molecular ion [M + H]+ and the ammonium adduct ion [M + NH4]+. By the solid-phase extraction, they were recovered relatively well, and the detection limits were ranged from 0.2 μg/ml to 2.5 μg/ml by scan mode, ranged from 5 ng/ml to 200 ng/ml by selected ion monitering (SIM) mode. In the urine sample, the coefficients of variations for the prepared method by SIM mode were ranged from 3.3‥ to 7.2‥ at 500 ng/ml level of each metabolite. For a blood sample of a female, who had committed suicide by taking MA, TSP-LC/MS analysis were attemped following the prepared method, the metabolites such as α-MCA were detected, and it was possible to prove that she had taken MA. © 1994, The Pharmaceutical Society of Japan. All rights reserved.<p /><p>Language: en</p>",
language="en",
issn="0013-273X",
doi="10.1248/jhs1956.40.357",
url="http://dx.doi.org/10.1248/jhs1956.40.357"
}