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Biomedical subjects

T Nambara

Publications and source records attributed to T Nambara.

At least 163 records · Page 9Linked to original sources
PubMed1980

Determination of captopril in biological fluids by gas-liquid chromatography.

The quantitation of captopril in biological fluids by gas-liquid chromatography using a flame photometric detector is described. Captopril was converted into an adduct with N-ethylmaleimide and then into the hexafluoroisopropyl ester. The latter derivative was separated on a 2% OV-210 column and determined by employing the captopril-N-hexylmaleimide adduct as an internal standard. The blood level and urinary excretion of captopril administered intravenously to dogs were measured by the proposed method.

Animals↗
PubMed1980

A novel immunization procedure involving pretreatment with cross-reacting steroid conjugated to a copolymer of D-glutamic acid and D-lysine for production of low cross-reactive antisera.

Anti-testosterone and anti-5 alpha-dihydrotestosterone antisera have been produced by pretreatment of mice with a cross-reacting steroid coupled to a copolymer of D-glutamic acid and D-lysine to inhibit production of cross-reacting antibodies before immunization with the specific steroid conjugated to a protein. 15 beta-Carboxyethylmercapto derivatives were used as haptens. The cross-reactivities of the anti-testosterone and anti-5 alpha-dihydrotestosterone antisera with 5 alpha-dihydrotestosterone and with testosterone were 0.49 and 13.5%, respectively.

Animals↗
PubMed1980

Preparation and antigenic properties of dehydroepiandrosterone sulfate-bovine serum albumin conjugates having a linkage through the position in ring D.

The preparation and antigenic properties of two different types of dehydroepiandrosterone sulfate-bovine serum albumin (BSA) conjugates in which the hapten is linked to the carrier protein through the C-17 or C-15 position have been described. Antibodies raised against these antigens in rabbits possessed the high affinity (Ka = 1.43 x 10(9)--2.20 x 10(9) M-1) to dehydroepiandrosterone sulfate. Antiserum elicited by immunization with the hapten-15 beta-BSA conjugate was specific to dehydroepiandrosterone sulfate, exhibiting no significant cross-reactivities for other sulfated steroids and no cross-reactions for free steroids and their glucuronides with an exception of 16 alpha-hydroxydehydroepiandrosterone 3-sulfate (16.8%).

Animals↗
PubMed1979

Determination of estrogen ring D glucuronides in pregnancy plasma by direct radioimmunoassay without hydrolysis.

A direct radioimmunoassay method using highly specific antisera without prior deconjugation has been developed for determination of estradiol 17-glucuronide and estriol 16-glucuronide in human plasma. Antisera were elicited in the rabbit by immunization with antigens in which the steroid haptens are linked to a carrier protein through the C-2 or C-4 position. After treatment with Rivanol the protein of albumin-free antiserum was covalently bound to a p-arylamine glass bead support through the cross-linkage with glutaraldehyde. A simple and reliable assay method employing the antibody-glass preparation was established and applied to measurement of estrogen ring D glucuronide concentration in peripheral plasma throughout normal pregnancy.

Animals↗