PMID- 17851144 OWN - NLM STAT- MEDLINE DCOM- 20071219 LR - 20121115 IS - 1570-0232 (Print) IS - 1570-0232 (Linking) VI - 858 IP - 1-2 DP - 2007 Oct 15 TI - Liquid chromatography-tandem mass spectrometric method for determination of mosapride citrate in equine tissues. PG - 135-42 AB - A simple method for determination of mosapride citrate and its metabolite, des-p-fluorobenzyl mosapride (M-1), in equine muscle, liver, kidney, adipose tissue and intestine by liquid chromatography-tandem mass spectrometry has been developed. (+/-)-4-Amino-5-chloro-2-ethoxy-N-[[4-(2-chlorobenzyl)morpholinyl]methyl]benzamide was used as an internal standard. The analytes and internal standard were spiked and extracted from tissues by acetonitrile. The chromatographic separation was performed on a reversed-phase TSK-GEL SUPER ODS column with a mobile phase of acetonitrile-0.05% (v/v) formic acid containing 5 mmol/L nonafluoropentanoic acid (2:3, v/v). The method exhibited a large linear range from 0.0005 to 0.2 microg/mL for both mosapride citrate and M-1 (r>0.9976). In the intra-day assay (n=5), the relative standard deviations (RSDs) ranged from 1.1 to 7.8% for mosapride citrate and 1.6 to 7.2% for M-1. In the inter-day assay (n=3), the RSDs ranged from 1.0 to 13% for mosapride citrate and 0.8 to 11% for M-1. The extraction recovery at 1.28 microg/g of mosapride citrate from equine tissues ranged from 97 to 107%. The lower limit of quantification for mosapride citrate was found to be 0.004 microg/g. Stability studies were carried out at different storage conditions. The method reported is reliable, precise, and accurate and it has the capacity to be used for determination of mosapride citrate and its metabolite in tissue samples. FAU - Aoki, Yoichi AU - Aoki Y AD - Department of Analytical Chemistry, Research Institute for Animal Science in Biochemistry and Toxicology, Sagamihara, Kanagawa 229-1132, Japan. FAU - Hakamata, Hideki AU - Hakamata H FAU - Igarashi, Yu AU - Igarashi Y FAU - Uchida, Kazunari AU - Uchida K FAU - Kobayashi, Hisato AU - Kobayashi H FAU - Hirayama, Norio AU - Hirayama N FAU - Kotani, Akira AU - Kotani A FAU - Kusu, Fumiyo AU - Kusu F LA - eng PT - Journal Article DEP - 20070822 PL - Netherlands TA - J Chromatogr B Analyt Technol Biomed Life Sci JT - Journal of chromatography. B, Analytical technologies in the biomedical and life sciences JID - 101139554 RN - 0 (Benzamides) RN - 0 (Morpholines) RN - I8MFJ1C0BY (mosapride) SB - IM MH - Adipose Tissue/chemistry MH - Animals MH - Benzamides/*analysis/standards MH - Chromatography, High Pressure Liquid/*methods MH - Horses MH - Intestines/chemistry MH - Kidney/chemistry MH - Liver/chemistry MH - Morpholines/*analysis/standards MH - Muscles/chemistry MH - Reference Standards MH - Reproducibility of Results MH - Tandem Mass Spectrometry/*methods EDAT- 2007/09/14 09:00 MHDA- 2007/12/20 09:00 CRDT- 2007/09/14 09:00 PHST- 2007/02/15 00:00 [received] PHST- 2007/07/26 00:00 [revised] PHST- 2007/08/13 00:00 [accepted] PHST- 2007/09/14 09:00 [pubmed] PHST- 2007/12/20 09:00 [medline] PHST- 2007/09/14 09:00 [entrez] AID - S1570-0232(07)00588-0 [pii] AID - 10.1016/j.jchromb.2007.08.017 [doi] PST - ppublish SO - J Chromatogr B Analyt Technol Biomed Life Sci. 2007 Oct 15;858(1-2):135-42. doi: 10.1016/j.jchromb.2007.08.017. Epub 2007 Aug 22.