Tadashi Nakatani

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Studies of the dietary intake of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and dioxin-like coplanar polychlorinated biphenyls (dioxin-like PCBs), collectively referred as dioxins, were conducted using the total diet study (TDS) method with food purchased in Osaka City, Japan during 2000-2002. The daily intake of(More)
Penicillium sp. NTC-47, which had been isolated from a soil sample, produced novel dihydroquinolinones when cultured with okara (the insoluble residue of whole soybean). These metabolites, 1 and 2, were crystalline products with molecular formulas of C17H17NO5 and C17H17NO4, respectively. The structure of 1 was established to be(More)
This study analysed the concentrations and toxic-equivalent (TEQ) levels of dioxin congeners in mackerel commercially available in Japan in early 2000s. The content of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like coplanar polychlorinated biphenyls (DL-PCBs) was determined in 17 mackerel samples from(More)
Toxic equivalent (TEQ) levels of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDDs/DFs) and coplanar polychlorinated biphenyls (CoPCBs) were analyzed in both crude (n = 5) and refined-hardening fish oils (n = 2), which are used in part as the raw materials of margarine and shortening, and in some retailed fish (n = 6), which may be similar to those(More)
The contents and composition of tetrodotoxin (TTX) and paralytic shellfish toxins (PSTs) in skin, muscle, and internal organs of two samples of marine puffer fish Canthigaster rivulata from Wakayama prefecture, Japan, were analyzed. Liquid chromatography-mass spectrometry (LC-MS) and high-performance liquid chromatography with post-column derivatization and(More)
A validation study was carried out on a rapid method for the simultaneous determination of pesticide residues in vegetables and fruits by LC-MS/MS. Preparation of the test solution was performed by a solid-phase extraction technique with QuEChERS (STQ method). Pesticide residues were extracted with acetonitrile using a homogenizer, followed by salting-out(More)
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