D. Haeusler, M. Mitterhauser, L. Mien, K. Shanab, R. Lanzenberger, E. Schirmer, J. Ungersboeck, L. Nics, H. Spreitzer, H. Viernstein, R. Dudczak, et al.
Abstract Since, to date very limited information on the distribution and function of the adenosine A3 receptor is available, the development of suitable radioligands is needed. Recently, we introduced [ 18F]FE@SUPPY (5-(2-[ 18F]fluoroethyl) 2,4-diethyl-3-(ethylsulfanylcarbonyl)-6-phenylpyridine-5-carboxylate) as the first PET-ligand for the A3R. Regarding the metabolic profile – this class of dialkylpyridines comprises two ester functions within one molecule, one carboxylic and one thiocarboxylic – one could expect carboxylesterases significantly contributing to cleavage and degradation. Therefore, our aim was the development of [ 18F]FE@SUPPY:2 (5-ethyl 2,4-diethyl-3-((2-[ 18F]fluoroethyl)sulfanylcarbonyl)-6-phenylpyridine-5-carboxylate), the functional isomer containing the label at the thiocarboxylic moiety. For satisfactory yields in high scale radiosyntheses, a reaction temperature of 75 °C has to be applied for at least 20 min using 20 mg/mL of precursor. So far, 6 complete high-scale radiosyntheses were performed. Starting from an average of 51.2±21.8 GBq (mean±SD) [ 18F]fluoride, 5.8±4.1 GBq of formulated [ 18F]FE@SUPPY:2 (12.0±5.4%, based on [ 18F]fluoride, not corrected for decay) were prepared in 75±8 min.
{"title":"Radiosynthesis of a novel potential adenosine A3 receptor ligand, 5-ethyl 2,4-diethyl-3-((2-[18F]fluoroethyl)sulfanylcarbonyl)-6-phenylpyridine-5-carboxylate ([18F]FE@SUPPY:2)","authors":"D. Haeusler, M. Mitterhauser, L. Mien, K. Shanab, R. Lanzenberger, E. Schirmer, J. Ungersboeck, L. Nics, H. Spreitzer, H. Viernstein, R. Dudczak, et al.","doi":"10.1524/RACT.2009.1663","DOIUrl":"https://doi.org/10.1524/RACT.2009.1663","url":null,"abstract":"Abstract Since, to date very limited information on the distribution and function of the adenosine A3 receptor is available, the development of suitable radioligands is needed. Recently, we introduced [ 18F]FE@SUPPY (5-(2-[ 18F]fluoroethyl) 2,4-diethyl-3-(ethylsulfanylcarbonyl)-6-phenylpyridine-5-carboxylate) as the first PET-ligand for the A3R. Regarding the metabolic profile – this class of dialkylpyridines comprises two ester functions within one molecule, one carboxylic and one thiocarboxylic – one could expect carboxylesterases significantly contributing to cleavage and degradation. Therefore, our aim was the development of [ 18F]FE@SUPPY:2 (5-ethyl 2,4-diethyl-3-((2-[ 18F]fluoroethyl)sulfanylcarbonyl)-6-phenylpyridine-5-carboxylate), the functional isomer containing the label at the thiocarboxylic moiety. For satisfactory yields in high scale radiosyntheses, a reaction temperature of 75 °C has to be applied for at least 20 min using 20 mg/mL of precursor. So far, 6 complete high-scale radiosyntheses were performed. Starting from an average of 51.2±21.8 GBq (mean±SD) [ 18F]fluoride, 5.8±4.1 GBq of formulated [ 18F]FE@SUPPY:2 (12.0±5.4%, based on [ 18F]fluoride, not corrected for decay) were prepared in 75±8 min.","PeriodicalId":21029,"journal":{"name":"Radiochimica Acta Radiochimica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86721684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract 109Cd was produced at a cyclotron vianatAg(p, n) 109Cd reaction by irradiation of an electroplated target with 15 MeV protons. The obtained yield was 70 kBq/μA h. The separation was performed using hematite nano-particles as sorbent which were synthesized by a solid-state chemical reaction method. The effect of different parameters, such as pH and the sorbent concentration, on extraction efficiency were investigated. The phase morphology, nanostructure and size of nano-particles were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The chemical and radionuclidic purity of 109Cd was determined by ICP-AES and HPGe detector gamma-ray spectrometry, respectively.
{"title":"Separation of 109Cd from silver targets by nanohematite","authors":"M. Sadeghi, H. Karami, P. Sarabandi, M. Mirzaee","doi":"10.1524/RACT.2009.1664","DOIUrl":"https://doi.org/10.1524/RACT.2009.1664","url":null,"abstract":"Abstract 109Cd was produced at a cyclotron vianatAg(p, n) 109Cd reaction by irradiation of an electroplated target with 15 MeV protons. The obtained yield was 70 kBq/μA h. The separation was performed using hematite nano-particles as sorbent which were synthesized by a solid-state chemical reaction method. The effect of different parameters, such as pH and the sorbent concentration, on extraction efficiency were investigated. The phase morphology, nanostructure and size of nano-particles were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The chemical and radionuclidic purity of 109Cd was determined by ICP-AES and HPGe detector gamma-ray spectrometry, respectively.","PeriodicalId":21029,"journal":{"name":"Radiochimica Acta Radiochimica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89591942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Aslam, S. Sudár, M. Hussain, A. A. Malik, H. Shah, S. Qaim
Abstract The radionuclide 64Cu (T1/2=12.7 h) is an important non-standard positron emitter, suitable for combining PET imaging and targeted therapy. Its production in no-carrier-added form is done via charged particle induced reactions, and considerable amount of cross section data are available in the literature. We evaluated seven reactions, namely 64Ni(p, n) 64Cu, 64Ni(d, 2n) 64Cu, 68Zn(p, αn) 64Cu, 66Zn(p, 2n) 64Cu, 64Zn(d, 2p) 64Cu, 66Zn(p, α) 64Cu and natZn(d, x) 64Cu. Data analysis was generally limited up to about 25 MeV and the consistency check of experimental data was carried out using the nuclear model codes STAPRE, EMPIRE and TALYS. In a few cases experimental data were available up to 100 MeV; the consistency check in the high energy region was done only using the code TALYS. A statistical procedure (supported by nuclear model calculations) was then used to fit the data. The derived recommended sets of data, together with 95% confidence limits, are reported. The integral yields calculated from those data are also given. A critical comparison of the various production routes of 64Cu is presented. The 64Ni(p, n) 64Cu reaction, utilizing a highly enriched target, is the method of choice.
{"title":"Charged particle induced reaction cross section data for production of the emerging medically important positron emitter 64Cu: A comprehensive evaluation","authors":"M. Aslam, S. Sudár, M. Hussain, A. A. Malik, H. Shah, S. Qaim","doi":"10.1524/RACT.2009.1670","DOIUrl":"https://doi.org/10.1524/RACT.2009.1670","url":null,"abstract":"Abstract The radionuclide 64Cu (T1/2=12.7 h) is an important non-standard positron emitter, suitable for combining PET imaging and targeted therapy. Its production in no-carrier-added form is done via charged particle induced reactions, and considerable amount of cross section data are available in the literature. We evaluated seven reactions, namely 64Ni(p, n) 64Cu, 64Ni(d, 2n) 64Cu, 68Zn(p, αn) 64Cu, 66Zn(p, 2n) 64Cu, 64Zn(d, 2p) 64Cu, 66Zn(p, α) 64Cu and natZn(d, x) 64Cu. Data analysis was generally limited up to about 25 MeV and the consistency check of experimental data was carried out using the nuclear model codes STAPRE, EMPIRE and TALYS. In a few cases experimental data were available up to 100 MeV; the consistency check in the high energy region was done only using the code TALYS. A statistical procedure (supported by nuclear model calculations) was then used to fit the data. The derived recommended sets of data, together with 95% confidence limits, are reported. The integral yields calculated from those data are also given. A critical comparison of the various production routes of 64Cu is presented. The 64Ni(p, n) 64Cu reaction, utilizing a highly enriched target, is the method of choice.","PeriodicalId":21029,"journal":{"name":"Radiochimica Acta Radiochimica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82397766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The vacancy transfer probabilities from K-shell to L2-, L3- and L-shell/subshells were measured in FexZn1-x thin film alloys. The samples were excited by γ photons with energy 59.5 keV from a 50 mCi 241Am radioisotope source. The emitted K X-rays were detected by an Ultra-LEGe having a resolution of 150 eV at 5.9 keV. For comparison with experimental results, theoretical calculations have been made using radiative and nonradiative transition rates. The measured results are in good agreement with theoretically calculated values within experimental errors. FexZn1-x thin film alloys were electrochemically deposited on aluminum substrates from sulfate bath. In conclusion, it was found that the vacancy transfer probabilities changed in FexZn1-x thin films for different compositions of x.
{"title":"Investigation of K to L shell/subshell vacancy transitions of Zn and Fe in FexZn1-x thin film alloys","authors":"Ö. Söğüt","doi":"10.1524/RACT.2009.1662","DOIUrl":"https://doi.org/10.1524/RACT.2009.1662","url":null,"abstract":"Abstract The vacancy transfer probabilities from K-shell to L2-, L3- and L-shell/subshells were measured in FexZn1-x thin film alloys. The samples were excited by γ photons with energy 59.5 keV from a 50 mCi 241Am radioisotope source. The emitted K X-rays were detected by an Ultra-LEGe having a resolution of 150 eV at 5.9 keV. For comparison with experimental results, theoretical calculations have been made using radiative and nonradiative transition rates. The measured results are in good agreement with theoretically calculated values within experimental errors. FexZn1-x thin film alloys were electrochemically deposited on aluminum substrates from sulfate bath. In conclusion, it was found that the vacancy transfer probabilities changed in FexZn1-x thin films for different compositions of x.","PeriodicalId":21029,"journal":{"name":"Radiochimica Acta Radiochimica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85807101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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