共查询到20条相似文献,搜索用时 62 毫秒
1.
L. Reyes-Herrera G. Ferro-Flores J. Lezama-Carrasco M. A. Gonzalez-Zavala F. Ureña-Nuñez E. Avila-Ramirez 《Journal of Radioanalytical and Nuclear Chemistry》1995,199(6):507-516
An alkaline kit formulation (pH 9) to obtain [99mTc]MAG3 with radiochemical puritives over 98% has been developed, avoiding the addition of filtered air to the vial, the use of large amounts of99mTc activity (i.e., 3.7 GBq) or the reconstitution of large volumes. The use of this radiopharmaceutical in mice showed a minimal accumulation in the hepatobiliary system (0.37±0.3% I.D., 1 h postinjection). However, in rabbits we always obtained good image quality. 相似文献
2.
N. H. Agha K. H. Nashat N. N. Yousif 《Journal of Radioanalytical and Nuclear Chemistry》1989,134(2):333-341
A formulation of stannous-diethyl-IDA freeze-dried kit, containing 50 mg diethyl-IDA and 0.4 mg hydrated stannous chloride, to be labelled with technetium has been developed for hepatobiliary scintigraphy. Gel chromatography column scanning technique has been applied for determination of technetium fractions in the preapration. The optimal pH value of the preparation with a high hepatobiliary specificity was found between 5.5 to 6.0. Effect of ligand to metal ratio on the stability of the prepared Sn-diethyl-IDA solution prior mixing with technetium has been investigated. The reaction conditions (initial pH) between the ligand and stannous ion affects the percent hydrolysis of the labelled compund, i.e. the formation rate of the complex. The organ distribution data of99mTc-diethyl-IDA in mice for 60 minutes post injection were satisfactory. The radiopharmaceutical exhibits rapid blood clearance, great hepatic clearance and very short hepatocyte transit time. Uptake of the radiopharmaceutical in various organs of mouse at 5 minute post injection showed that the greater part of the injected radioactivity has distributed between liver and intestine. However, about 12% and 60% of the injected dose has been found in liver and intestine respectively. The renal uptake of the HB agent in mice is relatively low and decreases with time to become about 0.3% at 60 minutes post injection. Blood clearance data of the radiopharmaceutical kit in rabbits showed that the HB agent is-rapidly cleared, since the initial decrease was very fast with a half-time of 1.5 minutes. 相似文献
3.
N. Ramamoorthy S. A. Balakrishnan S. M. Gaitonde P. M. Pandey U. N. Nayak M. C. Patel R. B. Patel P. Ramanathan 《Journal of Radioanalytical and Nuclear Chemistry》1989,134(2):423-431
Methods for the preparation and analysis of a new renal radiopharmaceutical,99mTc-thiodiglycolic acid (TDGA), are reported. The kit for Tc-TDGA contains a lypophilized acidic (pH 2.5) mixture of 5 mg TDGA and 0.05 mg SnCl2·2H2O. Acetate buffer has been found to be a suitable solvent for paper chromatography of99mTc-TDGA. The results of the quantitative organ distribution studies in rats and rabbits indicated the characteristics of99mTc-TDGA to be intermediate to the renal tubular agent131I-Hippuran and the GFR agent99mTc-DTPA.Parts of this work have been presented at the Indo-US Seminar on Radiopharmaceuticals-cum-17th Ann. Conf. of Soc. Nucl. Med. (India) held at Bangalore in Jan. 1986 and at the 18th Ann. Conf. of Soc. Nucl. Med. (India held at Madras in Dec. 1986. Also a part of this work has been included in the dissertation of N. Ramamoorthy submitted to the University of Bombay for the Ph. D. degree in chemistry. 相似文献
4.
M. S. Jovanović B. Zmbova T. Maksin V. Jovanović M. Odavić M. Rastovac N. Simova 《Journal of Radioanalytical and Nuclear Chemistry》1990,141(1):91-99
A procedure for obtaining a stable99mTc(V)-DMSA kit and methods for its radiochemical and biological control are described. The effect of pH on radiopharmaceutical stability of the complex was studied. The kinetic parameters of99mTc(V)-DMSA were determined on rats and compared to the corresponding values for renal99mTC-DMSA. Clinical tests showed that99mTc(V)-DMSA is suitable agent for detecting the primary medullar carcinoma of thyroid, as well as for detection of thyroid metastasis. 相似文献
5.
A. Perera C. Perez M. B. Torres A. Henandez F. C. Heres T. Moreira A. Gutierrez A. Gigato I. Hernandez L. Alberti O. Marrero L. Martinez J. M. Sanfiz E. Sanchez J. Rodriguez L. O. Marrero G. Parra 《Journal of Radioanalytical and Nuclear Chemistry》1999,240(2):481-487
The aim of this work was to obtain a freeze-dried kit for direct99mTc-labeling of human polyclonal IgG. The labeling procedure was carried out by Schwarz's method. The best yields of99mTc-IgG were obtained by using sodium pyrophosphate decahydrate as a weak chelating agent. Performed tests showed the stability
of the radiopharmaceutical up to 24 hours. Plasma clearance in rats was fitted to a biexponential curve withT
1/2α=(0.1 ±0.9) h andT
1/2β=(10±3) h. The organs with higher uptake of radiopharmaceutical were lung, kidneys and blood. In a rabbit model the abscess
target/background ratio was 3–6 according to time of the scintigraphic images. Thirty patients with musculoskeletal infection
were studied. Twenty-one lesions were detected and confirmed by culture/biopsy. 相似文献
6.
Mohamed A. Motaleb Mostafa Y. Nassar 《Journal of Radioanalytical and Nuclear Chemistry》2014,299(3):1759-1766
Phytochlorin [21H, 23H-Porphine-7-propanoicacid, 3-carboxy-5-(carboxymethyl)13-ethenyl-18-ethyl-7,8-dihydro-2,8,12,17-tetramethyl-,(7S,8S)] was labeled with 99mTc and the factors affecting the labeling yield of 99mTc-phytochlorin complex were studied in details. At pH 10, 99mTc-phytochlorin complex was obtained with a high radiochemical yield of 98.4 ± 0.6 % by adding 99mTc to 100 mg phytochlorin in the presence of 75 μg SnCl2·2H2O after 30 min reaction time. The molecular modeling study showed that the structure of 99mTc-phytochlorin complex presents nearly linear HO–Tc–OH unit with an angle of 179.27° and a coplanar Tc(N1N2N3N4) unit. Biodistribution of 99mTc-phytochlorin complex in tumor bearing mice showed high T/NT ratio (T/NT = 3.65 at 90 min post injection). This preclinical study showed that 99mTc-phytochlorin complex is a potential selective radiotracer for solid tumor imaging and afford it as a new radiopharmaceutical suitable to proceed through the clinical trials for tumor imaging. 相似文献
7.
The chemical condition of99mTc eluate obtained from a99Mo-99mTc generator is a function of the source, time elapsed after elution and age of the eluate. The radiochemical purity and stability of99mTc labeled MAb-170 (Tru-Scint®ADTM, photoactivated monoclonal antibody kit) preparations was evaluated comparing pertechnetate source of known age and elution history. The effect of H2O2, a radiolytic impurity in99mTc eluates, on the active kit components stannous ion and photoactivated MAb and radiolabeling, yield has been investigated. The lyophilized Tru-Scint® ADTM kit has been labeled with 20 to 80 mCi in 0.5 to 4.0 ml of Sodium Pertechnetate99mTc Injection, USP. The eluates were obtained from three brands of generators and used up to six hours after elution. The kits were reconstituted either with Sodium Pertechnetate99mTc Injection, USP or Sodium Chloride Injection, USP, 0.9% containing known amounts of H2O2. The reconstituted kits were analyzed for radiolabeling yield and radiochemical impurities, stannous ion and protein sulfhydryl group. The results indicated that the radiolabeling yield is a function of both the chemical condition of99mTc eluate, generator brand and the radiolabeling parameters like reconstitution volume and activity. The observed radiolabeling yield differences did not depend on the amount of chemical technetium in the eluate. The major radiochemical impurities at 15-minute post labeling have been identified as the99mTc-buffer complex and column adsorbed reduced99mTc (99mTc-Ad) species and not the unreduced99mTcO
4
–
. 相似文献
8.
J. L. Vučina 《Journal of Radioanalytical and Nuclear Chemistry》1996,212(5):333-340
The in vitro stability of99mTc (Sn)-PyP as a function of experimental conditions of the preparation of the kit and time elapsed after labeling has been tested. The preparation was protected by using nitrogen-purged reactant solutions and kit vials and by ascorbic acid. The samples under nitrogen are stable for 6 h when the content of99mTc-pertechnetate raises to 5%. The best stability was achieved by addition of 5 g of ascorbic acid per ml of the kit (content of99mTc-pertechnetate about 0.5%). To accelerate the decomposition, exogenous hydrogen peroxide was used. In this case it was found that the presence of 10 g of ascorbic acid inhibits the effect both of oxygen and peroxide (6 g H2O2/ml of the kit). Radiochemical purity of99mTc (Sn)-PyP remains practically unchanged for 6 h (content of99mTc-pertechnetate about 0.5%). 相似文献
9.
Labelling of meso-2,3-dimercaptosuccinic acid (DMSA) with technetium-99m was reinvestigated. Dependence of the 99mTc-DMSA complex formation on the molar ratio of DMSA:reducing agent (SnCl2·2H2O) and pH was studied. Five different types of 99mTc-DMSA complexes were determined. Especially three different complexes were established in the clinically used and prepared
DMSA kit labelled with 99mTc under alkaline condition. This radiopharmaceutical is used as imaging agent of the primary medullary carcinoma in the thyroid
gland and different metastasis types. The existence of all complexes was observed by paper chromatography, paper electrophoresis
and high performance liquid chromatography. 相似文献
10.
Y. F. Shafiq M. H. S. Al-Hissoni M. A. Abdel-Azeez M. H. Jassm A. M. Al-Hilli 《Journal of Radioanalytical and Nuclear Chemistry》1991,148(1):133-143
The distribution of four different commercially available A, B, C, D kits (99mTc-sulfur colloid) for hepatoimaging was compared in mice by organ radioassay and in rabbits for blood clearance. The distribution of kits A and C (single step kits) was assessed in the human by blood clearance, external liver, spleen measurement, and scintillation camera imaging. Kit A reaches a high concentration in liver within 15–20 minutes with relatively high surrounding tissue background, and superior spleen scintiphotos. However, when kit C was used, a high activity concentration in the liver was reached within 10–15 minutes with low tissue background and faint visualization of the radiotracer in the spleen. Blood clearance of the four99mTc-sulfur colloids was determined in rabbits. The data obtained indicated that the four hepatoagents exhibit rapid blood clearance but the initial decrease of blood activity curve of kit D was relatively faster than the other three hepatic agents. The biodistribution is similar for the four99mTc-S-colloids but the blood retained higher activity residue using kit A compared with others. The formation of99mTc-sulfur colloid using kits B, D (multistep kits) involves many steps after the addition of99mTcO
4
–
to the reagent. These procedures are time consuming, required facilities at the medical institutions and give rise to the radiation exposure. While single step kits A and C have the same diagnostic value, the use of kit C allows a reduction of absorbed radiation, which may be useful in the liver exploration in children. 相似文献
11.
V. Jovanović 《Journal of Radioanalytical and Nuclear Chemistry》1987,117(1):23-34
Physico-chemical characterization of99mTc-radiopharmaceuticals is presented. Limiting pH values, iso-osmotic pressure and the apparent coefficient values between two immiscible phases are determined too. A selection of radiochromatographic methods /stationary or mobile phase/ for routine quality control of99mTc radiopharmaceuticals for radiochemical purity was made. The methods chosen are simple, accurate, sufficiently sensitive and fast in operation. The mean values were determined for99mTc radiopharmaceutical distribution per organs, characteristic for the tested preparates and for radiochemical purity, as well as the time interval from injection to sacrifice of the animals. 相似文献
12.
Betül Taşdelen 《Journal of Radioanalytical and Nuclear Chemistry》2011,287(2):491-495
[99mTc-EDDA-HYNIC-D-Phe1, Tyr3]-Ocreotide (99mTc-EDDA-HYNIC-TOC) increasingly emerges to be an alternative tool for somatostatin receptor (SSTR) scintigraphy of neuroendocrine
tumours. The high quality of this radiopharmaceutical and its uniformity are very important facts for application of this
preparation in clinical practice. Various factors may influence the radiochemical purity (RCP) of certain reagent kits. Some
of these include the amount of activity added to the reagent kit, heating time and the age of the formulated kit. The effect
of these factors on RCP of 99mTc-EDDA-HYNIC-TOC has been investigated using high performance liquid chromatography (HPLC) and instant thin layer chromatography
(ITLC). 相似文献
13.
A. Owunwanne R. E. O'Mara C. O'Brien 《Journal of Radioanalytical and Nuclear Chemistry》1980,59(2):571-578
The in vivo and in vitro stability of99mTc hydroxyethlylidene diphosphonate, 99mTc methylenediphosphonate and99mTc pyrophosphate in plasma has been studied using paper chromatographic technique as the analytical tool. The results indicate that the amounts of99mTc activity found both at the origin and Rf range of99mTcO4 ? for in vivo experiments are slightly greater than those for either in vitro or control experiments. However, this amount of99mTc activity represents about 0.16–0.4% of the injected dose. Therefore, it is suggested that99mTc phosphorus radiopharmaceuticals are stable in vivo and neither oxidation nor hydrolysis of these bone imaging agents occurs in the blood. 相似文献
14.
Saad H. Al-Kouraishi 《Journal of Radioanalytical and Nuclear Chemistry》1988,125(1):213-220
An instant kit of cysteine (amino acid) to be labelled with99mTc was prepared. Optimal conditions were found, and a procedure to prepare the kit ready to use in liophilized form to gain the highest labelling yield. More than 95% labelling yield was obtained when99mTc (TcO
4
–
) eluted from99mTc-generator was added to the contents of the kit. Each kit contains 0.66 mg of SnCl2·2H2O as stannite and 66 mg cysteine in lyophilized form. The formulation of cysteine tin (kit) was stable for nearly three months giving labelling yield more than 95%. Using GCS technique, different species of technetium and labelled cysteine were identified when Sephadex (G-50, G-25) was applied. Biodistribution of the labelled preparation revealed that kidney was the target organ. The ratio of accumulated dose in kidneys/liver was greater than 2. 相似文献
15.
Betül Taşdelen 《Journal of Radioanalytical and Nuclear Chemistry》2011,290(2):283-287
Technetium-99m-sestamibi (99mTc-MIBI) is a small, lipophilic and cationic compound used for myocardial perfusion imaging. In addition, 99mTc-MIBI has been shown to be useful in identifying several types of tumors, such as breast, lung and thyroid cancers. The
high quality of this radiopharmaceutical and its uniformity are very important facts for application of this preparation in
clinical practice. The monograph for 99mTc-MIBI recommends at least 90% radiochemical purity (RCP) for clinical use. Various factors may influence the RCP of certain
reagent kits. Some of these include the amount of activity added to the reagent kit, heating time and the age of the formulated
kit. The effect of these factors on RCP of 99mTc-MIBI has been investigated using high performance liquid chromatography (HPLC) and instant thin layer chromatography. 相似文献
16.
F. P. Castronovo Jr. M. S. Potsaid S. Kopiwoda M. Peterson 《Journal of Radioanalytical and Nuclear Chemistry》1980,60(1):291-300
One formulation of14C labeled and another of99mTc labeled 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea (CCNU) were administered i.v. to tumor (glioma) bearing rats. The
radiopharmacokinetics of14C-CCNU were followed up to 24 hours post injection. On a per organ basis the blood, liver, small bowel, kidney cortex and
muscle contained most of the activity. Optimum tumor to organ ratios occurred at 4–12 hours. The99mTc-CCNU biodistribution was determined at 4 hours and compared to99mTc-NaTcO4. Tumor capsule to brain (29.5) and to muscle (10.59) ratios suggest99mTc-CCNU to be a potential tumor seeking agent.
Funded in part by USPHS Grant RR-05486-12. 相似文献
17.
M. A. Motaleb 《Journal of Radioanalytical and Nuclear Chemistry》2007,272(1):167-171
Prompt localization of infection sites is essential for initiating appropriate therapeutic measures. There have been major
advances in the management of patients suffering from infective and/or inflammatory disorders as a result of introduction
of newer drugs with high sensitivity and specificity. Since the last decade, 99mTc-ciprofloxacin was used as a biologically active radiopharmaceutical to diagnose inflammation but it has some problems related
to radiochemical purity and stability. The aim of this study is to develop simple and easy formulation of cefoperazone (other
broad spectrum antimicrobial agent) with 99mTc a ready to use labeling kit for infection imaging. The optimum condition that gives high labeling yield of 99mTc-cefoperazone complex, 97.9%, was achieved by using 3 mg cefoperazone, 100 μg Sn(II), at pH 8 and 10-minute reaction time.
For in vivo binding of 99mTc-cefoperazone pharmacokinetic studies were carried in experimentally induced infection, in the left thigh, using Staphylococcus aureus in rats. Both thighs of the rats were dissected and counted and the ratio of bacterial infected thigh/contralateral thigh
was then evaluated. The time for maximum accumulation of 99mTc-cefoperazone at the site of infection (T/NT = 4.5) was 45-minute post intravenous injection, followed by gradual decline. So, 99mTc-cefoperazone complex is simple and stable preparation for infection imaging after 45-minute post injection. 相似文献
18.
D. Janković D. Djokić T. Maksin M. Orlić 《Journal of Radioanalytical and Nuclear Chemistry》2002,251(3):463-466
The purpose of this study was to compare some physicochemical characteristics as well as pharmacokinetic behavior of 99mTc-PAH, as a novel renal agent, with 99mTc-MAG3 and 131I-OIH. 99mTc-PAH was prepared from lyophilized kit by adding 99mTcO4
–. Labeled complex was stabile and high radiochemical purity radiopharmaceutical, with a low percentage of protein bound to human albumin and hydrophilic character. In spite of its smaller renal uptake, 99mTc-PAH gave satisfactory renal images. 99mTc-PAH showed faster urinary elimination than 99mTc-MAG3 and similar to those one for 131I-OIH. The comparison of pharmacokinetic parameters of 99mTc-PAH, 99mTc-MAG3 and 131I-OIH indicated the favorable characteristics of 99mTc-PAH. 相似文献
19.
P. Unak F. Y. Lambrecht F. Z. Biber İ. E. Medine S. Teksoz 《Journal of Radioanalytical and Nuclear Chemistry》2004,261(3):587-591
Famotidine, a gastrointestinal drug was labeled with 99mTc and its radiopharmaceutical potential was observed on male Albino Wistar rats. Labeling yield was over 95%. Average specific
activity and n-octanol/water partition coefficient (lipophilicity) were approximately 74 MBq/mg-0.66 GBq/mg and 3.4, respectively.
Biodistribution studies were performed on Albino Wistar rats. The activity per gram tissue was calculated and time-activity
curves were generated. The majority of the activity was observed in stomach, small intestines and kidneys. Liver and kidneys
showed lower uptake compared to other H2-receptor rich tissues. Results show that 99mTc-famotidine is H2receptor specific.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
20.
C. H. Paik F. Vieras W. C. Eckelman R. C. Reba 《Journal of Radioanalytical and Nuclear Chemistry》1980,60(1):281-289
99mTc-labeled transferrin was prepared by reduction of99mTcO
4
−
; with stannous DTPA or stannous citrate followed by equilibration of the technetium chelate with human transferrin. The rate
of transfer of99mTc to transferrin in the presence of 0.015M citrate buffer was dependent on pH in the order pH 2.1> pH 7.2> pH 4.1> pH 5.9.
The incorporation rate was inversely proportional to the concentration of DTPA and citrate buffer. The replacement of citrate
buffer by acetate buffer or oxalate buffer reduced drastically the formation of99mTc-labeled transferrin at pH 4.1. The formation of99mTc-labeled transferrin prepared from the reduction of99mTcO
4
−
with stannous citrate was faster than that from the reduction with stannous DTPA in the presence of 0.015M citrate buffer
and pH 2.5. Equilibration of transferrin with99mTc-labeled pyrophosphate did not produce99mTc-labeled transferrin at pH 4.5. The ligand exchange labeling of99mTc to transferrin in 0.015M citrate did not cause appreciable denaturation of the protein at all pH values. This method also
enabled labeling of the protein in a low concentration (2.6·10−4 M) via tin reduction. Sequential external imaging of the99mTc-labeled transferrin in Sprague-Dawley rats bearing Walker-256 carcinosarcoma showed optimal tumor localization occurred
at 3 hr after injection. In spite of this,99mTc-labeled transferrin does not appear to be a suitable imaging agent because of the low tumor to blood ratio of99mTc (0.50±0.17) at 3 hr post injection. This is similar to that of6 7Ga-citrate (0.43±0.15%). 相似文献