共查询到20条相似文献,搜索用时 0 毫秒
1.
Yousef Fazaeli Amir R. Jalilian Mostafa M. Amini Ali Rahiminejad-kisomi Saeed Rajabifar Fatemeh Bolourinovin Sedigheh Moradkhani 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(1):17-24
[67Ga]labeled tetraphenyl porphyrin ([67Ga]-TPP) was prepared using freshly prepared [67Ga]GaCl3 and tetraphenyl porphyrin (TPPH2) for 30–60 min at 25 °C (radiochemical purity: >97 ± 1% ITLC, >98 ± 0.5% HPLC, specific activity: 13–14 GBq/mmol). Stability
of the complex was checked in final formulation and human serum for 24 h. The partition coefficient was calculated for the
compound (log P 1.89). The biodistribution of the labeled compound in vital organs of wild-type rats was studied using scarification studies
and SPECT imaging up to 24 h. A detailed comparative pharmacokinetic study performed for 67Ga cation and [67Ga]-TPP. The complex is mostly washed out from the circulation through kidneys and can be an interesting tumor imaging/targeting
agent due to low liver uptake and rapid excretion through the urinary tract. 相似文献
2.
Autoradiolysis of the 2-deoxy-2-[<Superscript>18</Superscript>F]fluoro-D-glucose radiopharmaceutical
E. Búriová F. Macášek F. Melichar M. Kropáček L. Procházka 《Journal of Radioanalytical and Nuclear Chemistry》2005,264(3):595-602
Summary To control virtually the toxic compounds and to improve quality control of the solution of 2-deoxy-2-[18F]fluoro-d-glucose (2-[18F]FDG), the products of its autoradiolysis were analyzed by high-performance liquid chromatography with electrospray mass spectrometric and radiometric detectors (HPLC/MS/RAD), thin layer chromatography on TLC silica plate and HPTLC on amino modified silica plate. Except Kryptofix™ 2.2.2, glucose and fluoride anion, no by-products and impurities were observed by LC/MS analysis of fresh 2-[18F]FDG samples. The analysis performed in the time interval of 6 to 48 hours after the end of 2-[18F]FDG synthesis indicated that the activity of the autoradiolysis products separated by HPLC did not exceed 1.3%. As the main autoradiolysis products of 3.3 . 10-5 to 4.4 . 10-5M 2-[18F]FDG solution of original specific activity 0.5-1.5 GBq . cm-3 were established: arabinose - 2.8 μM (G= 0.07/100 eV), gluconic and glucuronic acids 1.8-0.5 μM (G =0.01-0.05/100 eV), arabinose and araburonic acids occurred under 0.5 μM concentration at residual glucose contents about 0.14 mM. Radiation chemical yields of active products were calculated from molar activity of 2-[18F]FDG and the percentage of their activity: 0.5% radiochemical yield of 2-[18F]fluoroglucuronic acid corresponds to the G = 0.004/100 eV and 0.3% yield of 2-[18F]fluorogluconic acid issues G = 0.003/100 eV. 相似文献
3.
K. M. El-Azony 《Journal of Radioanalytical and Nuclear Chemistry》2010,284(2):315-320
A preparation of 125I-celecoxib is carried out via an electrophilic substitution reaction. The reaction parameters studied were celecoxib concentration,
reaction temperature, pH of the reaction mixture and kinds of oxidizing agents in order to obtain a high radiochemical yield
of the 125I-celecoxib. Using 3.7 MBq of Na125I, 150 μg (3.9 mM (mmol/L)) of celecoxib, and 1.6 mM (mmol/L) of chloramine-T (CAT) as oxidant at pH 4 and 60 °C for 15 min
a maximum radiochemical yield of 125I-celecoxib (65%) was obtained. The labeled compound was separated and purified by means of high pressure liquid chromatography
(HPLC). The biological distribution in infected mice indicates the suitability of radioiodinated celecoxib as imaging of tumor. 相似文献
4.
M. Patt A. Schildan B. Habermann O. Mishchenko J. T. Patt O. Sabri 《Journal of Radioanalytical and Nuclear Chemistry》2010,283(2):487-491
Quantum dots functionalized on the outer surface with either amino- or carboxyl functions were labelled with [18F]fluoroethyltosylate and [11C]methyliodide in order to use the positron emitter-labelled fluorescence agents for multimodality imaging techniques, i.e.
fluorescence imaging and positron emission tomography. 18F-Labelling of both compounds was realized with yields up to 5% as determined by size exclusion chromatography, which is twice
as much as reported in literature before [1]. 11C-Labelling of amino- and carboxyl-QDs proceeded with good yields (up to 45 and 35%, respectively) under optimized reaction
conditions. In general for both QD-types and both labelling agents the labelling yield increased with the amount of QDs used
in the reaction as well as with reaction time and reaction temperature. 相似文献
5.
A. M. Şenışık Ç. İçhedef A. Y. Kılçar E. Uçar K. Arı D. Göksoy Y. Parlak Bedriye Elvan Sayıt Bilgin S. Teksöz 《Journal of Radioanalytical and Nuclear Chemistry》2018,316(2):457-463
This study describes a single step conjugation of Glycylglycine (GlyGly) which is a small peptide, with [18F]FDG via oxime formation. Amiooxy-functionalization of GlyGly (AO-GlyGly) was accomplished through the reaction of Boc-aminooxy succinimide ester. Conjugation reaction was performed at 100 °C for 30 min in a vial containing AO-GlyGly and [18F]FDG solution. The radiolabeled product ([18F]FDG-GlyGly) was obtained with 98.65?±?0.35% yield without any purification step which makes this method more attractive for 18F radiolabeling. The present study is concluded with an in vivo pilot animal PET study to assess biodistribution and kinetics of chemoselectively [18F]FDG tagged GlyGly in vivo. 相似文献
6.
Jianyong Li Yunshang Yang Junxi Liu Rongcai Zhao Fenyi Yu Runhua Lu 《Journal of Radioanalytical and Nuclear Chemistry》2005,265(1):127-131
Summary The water-soluble fullerene derivative C60(OH)x was radiolabeled with 67GaCl3. The labeling yields were determined by radio-PLC. The effects of pH, reaction time, temperature and the amount of C60(OH)x on the labeling yields were studied. The stability of 67Ga-C60(OH)x was also examined. The results showed that the labeling yields could reach 97% under the best labeling conditions and the radiochemical purity of 67Ga-C60(OH)x solution kept at 37 °C remained at 88% after 212 hours. The biodistribution studies of 67Ga-C60(OH)x in mice showed a high localization of 67Ga-C60(OH)x in the bone marrow, bone, liver and spleen with slow clearance and a negligible accumulation in the blood. These data suggest that the water-soluble C60(OH)x, having the same properties as microcolloids, may be used as a carrier of drug system for lymphatic targeting. 相似文献
7.
PET with 68Ga from the TiO2- or SnO2- based 68Ge/68Ga generators is of increasing interest for PET imaging in nuclear medicine. In general, radionuclidic purity (68Ge vs. 68Ga activity) of the eluate of these generators varies between 0.01 and 0.001%. Liquid waste containing low amounts of 68Ge activity is produced by eluting the 68Ge/68Ga generators and residues from PET chemistry. Since clearance level of 68Ge activity in waste may not exceed 10 Bq/g, as stated by European Directive 96/29/EURATOM, our purpose was to reduce 68Ge activity in solution from >10 kBq/g to <10 Bq/g; which implies the solution can be discarded as regular waste. Most efficient
method to reduce the 68Ge activity is by sorption of TiO2 or Fe2O3 and subsequent centrifugation. The required 10 Bq per mL level of 68Ge activity in waste was reached by Fe2O3 logarithmically, whereas with TiO2 asymptotically. The procedure with Fe2O3 eliminates ≥90% of the 68Ge activity per treatment. Eventually, to simplify the processing a recirculation system was used to investigate 68Ge activity sorption on TiO2, Fe2O3 or Zeolite. Zeolite was introduced for its high sorption at low pH, therefore 68Ge activity containing waste could directly be used without further interventions. 68Ge activity containing liquid waste at different HCl concentrations (0.05–1.0 M HCl), was recirculated at 1 mL/min. With Zeolite
in the recirculation system, 68Ge activity showed highest sorption. 相似文献
8.
Preparation and evaluation of [<Superscript>201</Superscript>Tl](III)-DTPA complex for cell labeling
A. R. Jalilian Y. Yari-Kamrani M. Kamali-Dehghan S. Rajabifar 《Journal of Radioanalytical and Nuclear Chemistry》2008,275(1):109-114
Due to interesting physical properties and wide availability of 201Tl as a SPECT radionuclide, the incorporation of this nuclide into DTPA for cell labeling was targeted. Thallium-201 (T
1/2 = 3.04 d) in Tl+ form was converted to Tl3+ cation in the presence of O3/6M HCl and di-isopropyl ether, controlled by RTLC/gel electrophoresis methods. The final evaporated activity reacted with
cDTPA in normal saline to yield [201Tl](III)DTPA at room temperature after 0.5 hour, followed by solid phase extraction purification using C18 Sep-Pak column (radiochemical yield >95%). Radiochemical purity of more than 99% was obtained using RTLC with specific activity
of about 260 GBq/mmol. The stability of the tracer was checked in the final product in the presence of human serum at 37 °C
up to 3 days. The partition coefficient was also measured. The labeled compound was used in red blood cell (RBC) labeling.
The cell uptake ratio was determined at 4, 25 and 37 °C up to 3 hours. 相似文献
9.
The 99mTc(CO)3(H2O)-DEDT complex was prepared by a two-step procedure involving the preparation of the precursor fac-[99mTc(CO)3(H2O)3]+, followed by the addition of sodium salt of diethyl dithiocarbamate (DEDT). The radiochemical purity (RCP) of the product
was over 90% as measured by thin layer chromatography (TLC). No decomposition of the complex at room temperature was observed
over a period of 6 hours. Its partition coefficient indicated that it was a lipophilic complex. The electrophoresis results
showed the complex was neutral. Biodistribution in mice demonstrated that the complex can penetrate the intact blood-brain
barrier (BBB) and the brain uptake (ID%/g) was 4.22 at 5-minute post-injection, suggesting the complex may lead to a further
development of the radiopharma ceutical as a brain perfusion tracer. 相似文献
10.
Marin Ayranov Dorothea Schumann 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(3):649-654
The station for pions cancer therapy was operated at PSI from 1980 to 1992. After a cooling time of 12 years it’s made of
copper beam dump was cut and samples were taken for analytical purposes. The sampling collected about 500 g of high active
copper chips that can be used for separation of exotic radionuclides. The analyses by gamma spectrometry, LSC and AMS showed
main nuclides present to be 60Co, 54Mn, 22Na, 65Zn, 26Al, 53Mn, 59Ni, 63Ni, 55Fe and 60Fe and 44Ti with a daughter nuclide 44Sc. In the frame of ERAWAST project a procedure combining selective precipitation and ion exchange for the separation of the
rare radionuclides from the copper beam dump was developed. The proposed separation procedure is easy for remote controlled
implementation in a hot cell. The ion exchange separation of Ni, Al, Mg, Ti and Fe was complete and high decontamination factors
for copper and cobalt were achieved. Based on the developed procedure a remotely controlled system for separation of exotic
radionuclides from the copper chips was set up. The full scale system was installed in a hot cell where high activity levels
can be handled. In order to evaluate the reliability and functionality of the system extensive tests have been done. During
the test period 13.86 g in total of the proton irradiated copper beam dump were processed for separation of 26Al, 59Ni, 53Mn, 44Ti and 60Fe. The results showed that the system was operational and the radionuclide separation was selective with high chemical yield.
The procedure manages as well the generated liquid wastes containing high level of 60Co activity. 相似文献
11.
F. Yurt Lambrecht O. Yilmaz K. Durkan P. Unak E. Bayrak 《Journal of Radioanalytical and Nuclear Chemistry》2009,281(3):415-419
Linezolid is the first of new class of antibiotics, the oxazolidinones, and exhibits activity against many gram-positive organisms,
including vancomycin-resistant Enterococcus faecium, methicillin-resistant Staphylococcus aureus, and penicillin-resistant Streptococcus pneumoniae. Aim of the study: Linezolid was to label with I-131 and potential of the radiolabeled antibiotic was to investigate in inflamed
rats with S. aureus (S. aureus) and sterile inflamed rats with turpentine oil. Linezolid was labeled with I-131 by iodogen method. Biodistribution of [131I]linezolid was carried out in bacterial inflamed and sterile inflamed rats. Radiolabeling yield of [131I]linezolid was determined as 85 ± 1% at pH 2. After injecting of [131I]linezolid into bacterial inflamed and sterile inflamed rats, radiolabeled linezolid was rapidly removed from the circulation
via the kidneys. Binding of [131I]linezolid to bacterial inflamed muscle (T/NT = 77.48 at 30 min) was five times higher than binding to sterile inflamed muscle
(T/NT = 14.87 at 30 min) of rats. [131I]linezolid showed good localization in bacterial inflamed tissue. It was demonstrated that [131I]linezolid can be used to detect S. aureus inflammation in rats. 相似文献
12.
N. Saemian G. Shirvani H. Matloubi 《Journal of Radioanalytical and Nuclear Chemistry》2007,274(3):631-634
Three 1,2-diaryl pyrroles selective COX-2 inhibitors, 2-(4-fluorophenyl)-5-methyl-1-(4-methylsulfonyl-phenyl)-1H pyrrole,
2-(4-fluorophenyl)-1-[4-(methylsulfonyl) phenyl]-1H-pyrrole and 4-[2-(4-fluorophenyl)-1H-pyrrol-1-yl]benzenesulfon-amide,
all three labeled with 14C in the 2-position were prepared from para-fluoro-benzaldehyde-[carbonyl-14C]. 相似文献
13.
Sara Vosoughi Amir R. Jalilian Simindokht Shirvani-Arani Ali Bahrami-Samani Nafiseh Salek 《Journal of Radioanalytical and Nuclear Chemistry》2017,311(3):1657-1664
166Ho is one of the most effective radionuclides used for radiosynovectomy. One method to deliver this radioisotope to target tissue is via the 166Dy/166Ho in vivo generator system. The aim of this work was to prepare 166Dy/166Ho-chitosan (166Dy/166Ho-CHIT) in vivo generator for radiosynovectomy applications. 166Dy obtained by the irradiation of natural 164Dy target. 166Dy was separated from 166Ho by extraction chromatographic method (separation yield; 93% and separation factor;1.7). Chitosan labeling was performed in acetic acid with 99.3 ± 0.6% radiochemical purity. Biodistribution studies on intraarticular injected rats demonstrated high retention in the knee joint even 7 days showing no radioactivity leakage from the injection site into other organs as well as any translocation of the daughter nucleus after β? decay of 166Dy. 相似文献
14.
A. A. Kamyshova A. Z. Kreindlin P. V. Petrovskii A. S. Peregudov Yu. A. Borisov A. A. Koridze 《Russian Chemical Bulletin》2005,54(12):2805-2812
The reaction of [Cp*2RuBr]+Br− with bromine in CH2Cl2 (CD2Cl2) in an inert atmosphere at room temperature produces the complexes [Cp*Ru(Br)C5Me4CH2Br]+Br3
− (syn conformer), [Cp*Ru(Br)C5Me3(CH2Br)2]+ (syn and anti conformers), and [Ru(Br)(C5Me4CH2Br)2]+ (syn conformer). All complexes were characterized by 1H and 13C NMR spectroscopy; the former complex, by elemental analysis. These complexes were also prepared by the reaction of [Cp*RuC5Me4CH2]+BF4
− with bromine in CH2Cl2.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2712–2718, December, 2005. 相似文献
15.
S. P. Patil D. B. Kalgutkar N. Jayachandran V. K. P. Unny 《Journal of Radioanalytical and Nuclear Chemistry》2005,266(1):75-78
Summary An attractive and simple method has been developed for the preparation of ammonium [14C]thiocyanate from [14C]thiourea which eliminates the necessity of handling highly hazardous potassium [14C] cyanide. [14C]thiourea was isomerized to ammonium [14C]thiocyanate by heating the aqueous solution of thiourea (12%) in a sealed tube at 160 °C for 24 hours. The product formed was purified by silica-gel column chromatography. A radiochemical yield of 92.7% was obtained based on [14C]thiourea. The specific activity of the product obtained was 53.3 mCi/mmol (1.97 GBq/mmol) and the radiochemical purity was greater than 99%. This method has not been reported so far for the production of this labeled compound. 相似文献
16.
Hydrogenation of 7-phenyltricyclo[4.1.0.02,7]heptane-1-carboxylic acid over Raney nickel occurred in the syn-stereoselective fashion to give anti-7-phenylbicyclo[3.1.1]heptane-exo-6-carboxylic acid. The latter was used to synthesize 4,5-benzotricyclo[4.4.0.02,7]dec-4-en-3-one and two isomeric higher homologs, 5,6-benzotricyclo[5.4.0.02,8]undec-5-en-3-and-4-ones. 相似文献
17.
18.
The formation and fragmentation energies of the proton and sodium cation complexes with monosubstituted methane, cyclohexane,
and benzene derivatives in which carbon atoms are bonded to substituents (NH2, OH, F, Cl, Br, ONO2, NO2, COOH, CN, and Ph) were calculated by the B3LYP/6-31G(d) method. For [M + Na]+ complexes, the formation energies are much lower (and differ from one another to a much lesser extent), while the dissociation
energies are much higher, than the corresponding energies of the [M + H]+ complexes. Na+ cation shows a lower selectivity toward localization at functional groups in molecules compared to H+.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 246–249, February, 2008. 相似文献
19.
20.
S. Pommé E. García-Toraño G. Sibbens S. Richter R. Wellum A. Stolarz A. Alonso 《Journal of Radioanalytical and Nuclear Chemistry》2008,277(1):207-210
High-resolution alpha-particle spectrometry was performed on three uranium materials enriched in 235U. Besides the 235U peaks, separate peaks belonging to impurity traces of 234U could be quantified. Relying on the isotopic composition of the uranium, as determined by mass spectrometry, the ratio of
the half-lives of 238U and 235U was determined via the activity ratio of 234U and 235U in the materials. As an intermediate link, the 234U/238U half-life ratio was taken from published mass spectrometric analyses of ‘secular equilibrium’ uranium material. The resulting
half-life ratio T
1/2(238U)/T
1/2(235U) = 6.351±0.031 is in agreement with the commonly adopted half-life values determined by Jaffey et al. 相似文献