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1.
Analysis of the globins from fast human haemoglobins by isoelectrofocusing on polyacrylamide gel rods 总被引:2,自引:0,他引:2
M Castagnola P Caradonna L Cassiano C Degen F Lorenzin D Rossetti M L Salvi 《Journal of chromatography. A》1984,307(1):91-102
The globins from all fast haemoglobin (Hb) components obtainable by Bio-Rex 70 cation-exchange chromatography were examined by isoelectrofocusing on polyacrylamide gel rods with 8.0 mol/l urea. From this analysis HbA1a1 and HbA1a2 seem to be very heterogeneous components. HbA1b is separable into two components, one of which is varied in both the beta chains. Between HbA1b2 and the well-known HbA1c components two chromatographic peaks are separated, one with a noticeable percentage of glucosylated beta chain and one that probably contains HbF. HbA1c has both beta chains glucosylated, while HbA1x seems to be a beta monoglucosylated Hb form. Finally, the early part of the HbAo peak has a large amount of glucosylation on both alpha and beta chains. 相似文献
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When probing nuclear spins in materials on the nanometer scale, random fluctuations of the spin polarization will exceed the mean Boltzmann polarization for sample volumes below about (100 nm){3}. In this Letter, we use magnetic resonance force microscopy to observe nuclear spin fluctuations in real time. We show how reproducible measurements of the polarization variance can be obtained by controlling the spin correlation time and rapidly sampling a large number of independent spin configurations. This allows significant improvement in the signal-to-noise ratio for nanometer-scale magnetic resonance imaging. 相似文献
4.
Exploring the Synthesis of a New Group of Chiral Ammonium Salts with Specific Configurations at the Stereogenic Nitrogen Centers
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Dr. Prisca K. Eckert Christopher Golz Dr. Patrick Degen Cornelia Werner Prof. Dr. Heinz Rehage Prof. Dr. Carsten Strohmann 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(12):3268-3272
A group of new chiral dications with a fixed, specific configuration at the stereogenic nitrogen center was created. Stereoselective synthesis and recrystallization give the diastereomerically and enantiomerically pure dications, including a chiral amphiphile with surface‐active properties. 相似文献
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An improved method for the determination of 1-hydroxy-3-aminopropylidene-1,1-bisphosphonate (pamidronate) in human urine and plasma is described. The procedure is based on a co-precipitation of the bisphosphonates (pamidronate and 6-amino-1-hydroxypentilidene-bisphosphonate, used as internal standard) with calcium phosphate. After centrifugation the precipitate is redissolved in hydrochloric acid, followed by a second precipitation. Then the bisphosphonates are dissolved in ethylenediaminetetraacetic acid, derivatized with fluorescamine, and separated by high-performance liquid chromatography. Using fluorescence detection, the limit of quantitation for pamidronate was 0.8 mumol/l in plasma and 0.7 mumol/l in urine. 相似文献
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A sensitive and specific quantitative assay has been developed for the determination of 4-hydroxyandrostenedione (4-OHA), a potent aromatase inhibitor used in the treatment of estrogen-dependent breast cancer. This steroid has a high first-pass metabolism and is extensively metabolized, mainly by glucuronidation. Plasma levels of unchanged 4-OHA are very low, even after high peroral doses. The analytical method is based on the addition of 17 alpha-ethinylestradiol (internal standard), liquid-liquid extraction from biological material followed by extractive alkylation with pentafluorobenzyl bromide and quantitation by gas chromatography. The method has been validated for sensitivity, accuracy and precision and was found to be suitable for application to pharmacokinetic and bioavailability studies of peroral formulations of 4-OHA. 相似文献
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P H Degen 《Journal of chromatography. A》1979,176(3):375-380
A gas chromatographic method is described for the specific determination of unchanged hydralazine in plasma. On treatment with 2,4-pentanedione, hydralazine is converted into 1-(3,5-dimethyl-1-pyrazolyl)phthalazine, a stable compound which is easily extracted from biological material and determined quantitatively by gas chromatography with nitrogen-specific detection. 4-Methylhydralazine is used as an internal standard. The sensitivity of the method is ca. 10 ng/ml. Hydrazones of hydralazine do not interfere with the assay. 相似文献