By Colin F. Poole, Hal T. Butler, Myra E. Coddens, Sheila A. Schuette (auth.), Donald M. Wieland, Michael C. Tobes, Thomas J. Manger (eds.)

In 1906, Michael T. candy first built the chromatographic procedure by utilizing an adsorbant to split pigments. considering that that point, the technological advances in TLC and HPLC have caused new definitions of purity in parallel with the advances. Radiopharmaceutical chemistry is mainly depending on the chromat­ ographic method end result of the rather small quantity of fabric in so much radiopharmaceuticals-often so small that the standard actual tools of analytical chemistry can't be used. for this reason, this selection of papers represents the major to profitable radiopharmaceutical improvement via atmosphere the traditional for the pres­ of radiochemical purity. ent-day definition William C. Eckelman, Ph.D. Diagnostics affiliate Director The Squibb Institute for clinical examine New Brunswick, New Jersey Preface The chapters herein are up to date and improved types of shows that the authors made at a symposium hung on June four, 1984 in la, California below the sponsorship of the Radiopharmaceutical technological know-how Council of the Society of Nuclear medication. All manuscripts have been refereed. The cause of the symposium organizers was once to enlist contributors who paintings on a day by day foundation with the analytical and chromatographic suggestions to be mentioned on the symposium. We believe convinced that this distillation of hands-on event should be of price to graduate scholars in addition to skilled researchers in radio­ pharmaceutical chemistry and similar fields which use radiotracer methodology.

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2 Note: All assays using acetone and MEK solvents in ITLC were per- formed on the same sample vials. 5. 5, the ITLC procedures used for these materials are accurate to within 2% of the actual value of 99mTcOi present. 6. 7 for 99mTc-DisIDA and 99mTc-Glucoheptonate. 1) is accurate to within -2% of the true value. 3. 99mTcOi Measurements by lTLC of 99mTc-Glucoheptonate with Development of Wet vs. 4% 99mTcOi added to* 99mTc-Glucoheptonate after addition of excess WTcOi 33% 99mTcOi added to* 99mTc-Glucoheptonate after addition of excess 99TcOi a Duplicate assays of same vial.

Chromatogr. HPLC Magzn. 1:282-289, 1983. F. : Contemporary Practice of Chromatography. Elsevier, Amsterdam, 1984, pp. 619-700. , Piet, L. : Some quantitative aspects of high performance thin-layer chromatography. 1. Liquid. , 1985, in press. 36 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. Instrumental Evaluation of Thin-Layer Chromatograms Halpaap, H. : Thin-layer chromatographic and high-performance thin-layer chromatographic ready-for-use preparations with concentrating zones.

Quantitative measurements can be made with a photodensitometer to measure the darkening of the developed film. The disadvantages of autoradiography are that the film may require extremely long exposure times, it is difficult to quantify, particularly for wide ranges of radioactivity, and it can show false images as a result of chemical interactions between the TLC layer and the film. , 3H), a large part of their energy is absorbed by the chromatographic layer so that only a few electrons reach the photographic emulsion.

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