Biomedical subjects

M Shimamine

Publications and source records attributed to M Shimamine.

At least 19 recordsLinked to original sources

PubMed1993

[Studies on identification of drugs of abuse by diode array detection. I. Screening-test and identification of benzodiazepines by HPLC-DAD with ICOS software system].

For the establishment of screening-test and identification of 20 benzodiazepines (Alprazolam, Bromazepam, Chlordiazepoxide, Clonazepam, Clotiazepam, Cloxazolam, Diazepam, Estazolam, Fludiazepam, Flunitrazepam, Flurazepam, Lorazepam, Lormetazepam, Medazolam, Midazepam, Nimetazepam, Nitrazepam, Oxazepam, Prazepam, Triazolam), the optimum separation condition on HPLC was investigated by using Interactive Computer Optimization for HPLC Separation (ICOS) software. The two eluent systems of 0.02M KH2PO4 (pH 3.1)-methanol-acetonitrile (66.4:5.7:27.9) and 0.1% TFA-methanol-acetonitrile (61.6:16.1:22.3) were selected by HPLC analyses using ICOS. These optimum separation conditions enabled the screening test and identification of the 20 benzodiazepines on HPLC with photodiode array detection.

Benzodiazepines↗

PubMed1993

[Studies on the identification of psychotropic substances. IX. Preparation and various analytical data of reference standard of new psychotropic substances, N-ethyl methylenedioxyamphetamine, N-hydroxy methylenedioxyamphetamine, mecloqualone, 4-methylaminorex, phendimetrazine and phenmetrazine].

The reference standards of N-Ethyl methylenedioxyamphetamine, N-Hydroxy methylenedioxy-amphetamine, Mecloqualone, 4-Methylaminorex. Phendimetrazine and Phenmetrazine were chemically prepared from commercial chemicals. Their purities determined by HPLC were more than 99.8%. The standard spectra and chromatograms of the standards such as TLC, UV, IR, HPLC, GC/MS and NMR were measured. For the identification of these six drugs in forensic laboratory, their mass fragmentation and NMR spectra were discussed.

3,4-Methylenedioxyamphetamine↗

PubMed1992

Hair analysis for drugs of abuse. IV. Determination of total morphine and confirmation of 6-acetylmorphine in monkey and human hair by GC/MS.

The reliable analytical method for total morphine in hair was established by GC/MS-SIM. The calibration curve for morphine in hair showed linear over 0.5-100 ng/mg hair. Though the limit of detection was 0.1 ng/mg hair with an S/N > 3 of the base ion(m/z 429) for morphine, the limit of confirmation by detection of three major ions was 0.5 ng/mg. The hydrolytic extraction of the morphine analogs in hair with 10% HCl for 1 h at 100 degrees C gave quantitative recovery of morphine. The reproducibility of recovery of morphine spiked to the control hair was 2.9-7.3% in a concentration range between 2 and 50 ng/mg hair. The three monkeys were administered once a day with morphine at 10 mg/kg and heroin at 2.5 mg/kg, respectively, for 10 days and their back hair newly grown for 10 weeks was cut for analysis. The levels of total morphine in monkey hair intoxicated with morphine and heroin were 3.4 and 5.2 ng/mg, respectively. Taking their doses into account, it is concluded that the morphine level in hair from monkeys administered with heroin was 6 times higher than that with morphine. In hair from monkeys and humans intoxicated with heroin, 6-acetylmorphine was detected at the level of 0.7-7.2 ng/mg as a major component in hair together with morphine and no heroin. Drug concentrations of sectional hair shaft cut 2 cm each from the root side were compared with the self-reported drug histories of three cases. The results of sectional analysis of heroin abuser's hair suggested that the relationship between the distribution of morphine along hair shaft and the drug use history showed a good correlation, though the accumulation of heroin metabolites in body could result from chronic use of heroin.

Animals↗

PubMed1992

[Studies on origin of illicit methamphetamine. I. The relationship of enantiomeric compositions between methamphetamine and its raw material (ephedrine)].

In order to elucidate the relationship of enantiomeric compositions between methamphetamine (MA) and its raw materials, ephedrine (EP) enantiomers, commercial EP samples and MA samples prepared from them were analyzed by HPLC using GITC-prelabeling. The GITC derivatives were separated on ODS column using methanol-water-acetic acid (45:54:1) at a flow rate of 1.2 ml/min for EP and tetrahydrofuran-water-acetic acid (29:70:1) at a flow rate of 1 ml/min for MA. The chromatographic conditions resulted in such a good separation of four EP and two MA enantiomers that 1/1000 enantiomeric impurities could be detected and discriminated from the major enantiomer with good reproducibility. Moreover, it was demonstrated that the asymmetric center at alpha-position of amino group was entirely retained throughout the reductive reaction of the EP samples, and that the MA samples inherited the enantiomeric character from the EP samples used. This method was applied to discriminative analysis of MA samples seized in Japan.

Chromatography, High Pressure Liquid↗

PubMed1992

[Studies on the identification of psychotropic substances. VIII. Preparation and various analytical data of reference standard of some stimulants, amfepramone, cathinone, N-ethylamphetamine, fenethylline, fenproporex and mefenorex].

The Reference Standards for amfepramone, cathinone, N-ethylamphetamine, fenethylline, fenproporex and mefenorex were prepared. Their purities determined by HPLC were more than 99.5%. For the identification and determination of these six drugs, their analytical data were measured and discussed by TLC, UV, IR, HPLC, GC/MS and NMR.

Alkaloids↗

PubMed1991

Hair analysis for drug abuse: I. Determination of methamphetamine and amphetamine in hair by stable isotope dilution gas chromatography/mass spectrometry method.

Determination of methamphetamine and amphetamine in hair was performed by gas chromatography/mass spectrometry using stable isotope-labeled internal standards, 2-methylamino-1-phenylpropane-2,3,3,3-d4 and 2-amino-1-phenylpropane-2,3,3,3-d4. Extraction of hair with methanol/5M hydrochloric acid (20:1) using ultrasonication was chosen as the standard method. The calibration curves for amphetamines in the hair were linear from 1 to 100 ng/mg (r greater than 0.99). The detection limit was 0.5 ng/mg at the 95% confidence level. The coefficients of variation (CV) (n = 8) of analysis using the spiked hair with methamphetamine were from 0.7 to 6%. The CV (n = 8) of analysis of the methamphetamine abuser's hair was 17.5%. Sectional analysis of monkey and human hair after methamphetamine ingestion suggested a good correlation between the duration of drug use and drug distribution in the hair.

Adult↗

PubMed1990

[Studies on the identification of psychotropic substances (VII). Preparation and various analytical data of standard references of some hallucinogens, 3,4-methylenedioxyamphetamine (MDA), 3,4- methylenedioxymethamphetamine (MDMA) and 5-methoxy-3,4- methylenedioxyamphetamine (MMDA)].

The Reference Standards of 3, 4-methylenedioxyamphetamine (MDA), 3, 4-methylenedioxymethamphetamine (MDMA) and 5-methoxy-3,4-methylenedioxyamphetamine (MMDA) were prepared. Their purities determined by HPLC were 99.8% for DMA hydrochloride, 99.8% for MDMA hydrochloride and 99.5% for MMDA hydrochloride. For the identification and determination, various analytical data of the three drugs were measured and studied by TLC, UV, IR, HPLC, GC/MS and NMR.

3,4-Methylenedioxyamphetamine↗

PubMed1989

[Studies on the identification of psychotropic substances. VI. Preparation and various analytical data of reference standards of some hallucinogens, 2,5-dimethoxy-4-methylamphetamine (STP), 2,5-dimethoxy-4-bromoamphetamine (DOB) and 2,5-dimethoxy-4-ethylamphetamine (DOET)].

The Reference Standards of 2,5-dimethoxy-4-methylamphetamine (STP), 2,5-dimethoxy-4-bromoamphetamine (DOB) and 2,5-dimethoxy-4-ethylamphetamine (DOET) were prepared. Their purities measured by HPLC were 99.5% for STP hydrochloride, 99.8% for DOB hydrobromide and 99.5% for DOET hydrochloride. For the identification and determination, various analytical data of the three drugs were obtained by using UV, IR, HPLC, GC/MS and NMR, and the discrimination were discussed.

DOM 2,5-Dimethoxy-4-Methylamphetamine↗

PubMed1987