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Volume 44 (2003)
- Issue 6 Pages 269-
- Issue 5 Pages 213-
- Issue 4 Pages 181-
- Issue 3 Pages 145-
- Issue 2 Pages 77-
- Issue 1 Pages 1-
Volume 44, Issue 3
Displaying 1-6 of 6 articles from this issue
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Tomoaki MORIYAMA, Kumiko SHINDOH, Yoji TAGUCHI, Hisayoshi WATANABE, Ak ...2003 Volume 44 Issue 3 Pages 145-149
Published: June 25, 2003
Released on J-STAGE: January 21, 2009
JOURNAL FREE ACCESSMilled rice and bran were prepared from brown rice (Oryza sativa japonica) using a commercial scale rice-mill to investigate the changes in cadmium (Cd) content caused by the milling process. Rice sample solution was prepared by microwave digestion using HNO3 and HF, then analyzed by ICP-MS. Cd was measured at m/z 114 in interference correction with MoO and Sn. The digestion method was validated with 4 kinds of certified reference material of “rice flour”. We found that the Cd content was reduced only slightly by the milling process. When the Cd concentration of brown rice was regarded as 100, the relative content of the milled rice was 97 (average of 6 samples). In addition, the reduction of the Cd content was only slight when milled rice was processed to “wash-free” rice. The relative Cd content of the bran was 139 when that of brown rice was regarded as 100. These results support the hypothesis that the Cd content is not greatly decreased by the milling process.View full abstractDownload PDF (521K) -
Masakazu HORIE, Harumi TAKEGAMI, Kazuo TOYA, Yoshinori KIKUCHI, Hiroyu ...2003 Volume 44 Issue 3 Pages 150-154
Published: June 25, 2003
Released on J-STAGE: January 21, 2009
JOURNAL FREE ACCESSA simple and reliable method using liquid chromatography-electrospray ionization-mass spectrometry (LC/ESI-MS) has been developed for the determination of the macrolide antibiotics spiramycin and tilmicosin in meat and fish. The drugs were extracted from meat and fish with 0.2% metaphosphoric acid-methanol (6 : 4), and the extracts were cleaned up on an Oasis HLB cartridge (60 mg). Positive ionization produced the molecular related ions, (M+2H)2+, at m/z 350.2, 422.3 and 435.3 for neospiramycin I, spiramycin I and tilmicosin, respectively. The LC separation was performed on a Capcell Pak MG-C18 column (150×2 mm i.d.) with a gradient system of 0.02% formic acid-acetonitrile as the mobile phase at a flow rate of 0.2 mL/min. The molecular-related ions of the drugs were very clear under this condition. The calibration graph for each drug was rectilinear from 0.05 to 5 ng with selected ion monitoring (SIM). The recoveries of the drugs from meat and fish fortified at the level of 0.2 μg/g was 73.2-89.2%, with high precision. The limits of detection of the drugs in meat and fish were 0.01 μg/g.View full abstractDownload PDF (592K) -
Hiroshi FUJIKAWA, Akemi KAI, Satoshi MOROZUMI2003 Volume 44 Issue 3 Pages 155-160
Published: June 25, 2003
Released on J-STAGE: January 21, 2009
JOURNAL FREE ACCESSA new logistic model for bacterial growth was developed in this study. The model is based on a logistic model, which is often applied for biological and ecological population kinetics. The new model is described by a differential equation and contains an additional term for suppression of the growth rate during the lag phase, compared with the original logistic equation. The new model successfully described sigmoidal growth curves of Escherichia coli and Salmonella under various initial conditions. Data for E. coli were obtained from our experiments and data for Salmonella from the literature. When the new model was compared with a modified Gompertz model, which is widely used by many predictive microbiology researchers, it proved to be superior to the Gompertz model. Further, Salmonella growth at varying temperature could be well simulated by the new model. These results indicate that the new model will be a useful tool to predict bacterial growth under various temperature profiles.View full abstractDownload PDF (231K)
Reports
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Harumi KONDO, Eiko AMAKAWA, Hiroshi SATO, Yoko AOYAGI, Kazuo YASUDA2003 Volume 44 Issue 3 Pages 161-167
Published: June 25, 2003
Released on J-STAGE: January 21, 2009
JOURNAL FREE ACCESSAn analytical method was developed for determination of organochlorine, pyrethroid and nitrogen-containing pesticide residues in agricultural products by GC/MS, GC-ECD and GC-FTD. Pesticides were extracted with acetonitrile, and the organic layer was cleaned up on C18 and ENVI-Carb/LC-NH2 cartridges. Pesticides were determined by GC/MS, GC-ECD and GC-FTD.
Detection limits of pesticides by GC/MS and GC were below 1∼30 ng/g and 1∼3 ng/g, respectively. Recoveries of 27 out of 53 pesticides determined by GC/MS and 47 out of 53 determined by GC were 70∼120%. This method was useful for the multiresidue analysis of pesticides in agricultural products. Pesticide residues in 81 domestic crops were investigated from April 2001 to March 2002. Residues of 31 pesticides were detected from 21 crops.View full abstractDownload PDF (427K) -
Yukiko ABE, Takiko SUGITA, Chiseko WAKUI, Tatsuhiro NIINO, Chikako YOM ...2003 Volume 44 Issue 3 Pages 168-174
Published: June 25, 2003
Released on J-STAGE: January 21, 2009
JOURNAL FREE ACCESSWe investigated the labeling and content of plasticizers of soft plastic toys. First, we investigated material labeling in 96 products purchased in fiscal years 2000 and 2001. Among these products, 43% of those purchased in fiscal 2000 and 68% of those purchased in fiscal 2001 were labeled. We then investigated the kinds and amounts of plasticizers in 73 soft polyvinyl chloride (PVC) toys. Three kinds of phthalates and six other kinds of plasticizers were detected in the soft PVC toys. Diisononyl phthalate, di(2-ethylhexyl) phthalate, diisononyl adipate, and O-acetyl tributyl citrate were detected at high frequency, and in large amounts. The average total content of all plasticizers was 280 mg/g for the products purchased in fiscal 2000 and 227 mg/g for those in fiscal 2001. In fiscal 2001, antioxidants, 4-nonylphenol, and bisphenol A were investigated in addition to plasticizers.View full abstractDownload PDF (523K) -
Seisaku YOSHIDA, Shuzo TAGUCHI, Yukio TANAKA, Shinjiro HORI2003 Volume 44 Issue 3 Pages 175-179
Published: June 25, 2003
Released on J-STAGE: January 21, 2009
JOURNAL FREE ACCESSS-421 is a synergist for pyrethroid and organophosphorus pesticides, and is widely used in termiticides or commercial household insecticides. S-421 is mutagenic, stable and ubiquitous in the environment, and has been detected in household dust, surface water, sediments and rainwater. Here we describe the concentration of S-421 residues in domestic and imported fish collected in Osaka. S-421 was extracted with acetone/hexane, purified through silica gel 40 and quantified by ECD-GC. S-421 was detected in 36 out of 44 samples of domestic fish and shellfish analyzed, at a level of <0.2 to 2.3 ng/g (mean: 0.6 ng/g), and in 27 out of 43 imported samples at a level of <0.2 to 1.0 ng/g (mean: 0.2 ng/g). The levels of S-421 detected in fish were lower than those of DDTs and almost the same as those of HCHs. More attention should be paid to the behavior in the environment of S-421, as well as other persistent organochlorine pollutants, such as HCHs, DDTs and chlordane.View full abstractDownload PDF (303K)
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