Browsing by Author "Ibrahim A.B."

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    Preparation and biological profile of 99mTc-lidocaine as a cardioselective imaging agent using 99mTc eluted from 99Mo/99mTc generator based on AlMo gel
    (Springer Netherlands, 2017) Sakr T.M.; Ibrahim A.B.; Fasih T.W.; Rashed H.M.; Radioactive Isotopes and Generators Department; Hot Laboratories Centre; Atomic Energy Authority; Cairo; 13759; Egypt; Pharmaceutical Chemistry Department; Faculty of Pharmacy; October University of Modern Sciences and Arts (MSA); Giza; Egypt; Labeled Compounds Department; Hot Labs Center; Atomic Energy Authority; P.O. Box 13759; Cairo; Egypt
    The current study is aimed to prepare 99mTc-lidocaine as a new myocardial perfusion-imaging agent. The used 99mTc was obtained from Al. 99Mo-molybdate(VI) gel matrix. 99mTc-lidocaine showed higher (15.4. 0.11% ID/g) and faster (15. min post injection) cardiac uptake than the recently studied 99mTc-valsartan and 99mTc-procainamide. Consequently, 99mTc-lidocaine will be a valuable myocardial SPECT agent for diagnosis of emergency patients. Besides, the receptor affinity study confirmed the selectivity of 99mTc-lidocaine for sodium channels in the heart. 2017, Akadmiai Kiad, Budapest, Hungary.
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    Radioiodinated doxorubicin as a new tumor imaging model: preparation, biological evaluation, docking and molecular dynamics
    (Springer Netherlands, 2018) Ibrahim A.B.; Alaraby Salem M.; Fasih T.W.; Brown A.; Sakr T.M.; Labeled Compounds Department; Hot Labs Center; Atomic Energy Authority; Cairo; 13759; Egypt; Pharmaceutical Chemistry Department; Faculty of Pharmacy; October University of Modern Sciences and Arts (MSA); Giza; Egypt; Radioactive Isotopes and Generators Department; Hot Laboratories Centre; Atomic Energy Authority; Cairo; 13759; Egypt; Department of Chemistry; University of Alberta; Edmonton; Canada
    Abstract: Non-invasive molecular imaging techniques are accruing more interest in the last decades. Several radiolabelling elements have been FDA-approved and are currently used to characterize tumors. In this study, the DNA intercalating agent doxorubicin was radiolabelled with 125I. Several parameters for the radiolabelling reaction were investigated and optimized. A maximum yield of 94 � 0.3% was reached after reacting 20�?g of doxorubicin with 200�?g Chloramine-T at pH 5 for 30�min. The in vivo stability of 125I-doxorubicin is validated by the low propensity for thyroid uptake in mice. The preclinical T/NT ratio was approximately 6.4 at 30 min. Docking and molecular dynamics confirmed that the radiolabelling of doxorubicin did not affect (or slightly improved its binding to DNA). Overall, 125I-doxorubicin was demonstrated to be a promising non-invasive probe for solid tumor imaging. Graphical Abstract: [Figure not available: see fulltext.]. � 2018, Akad�miai Kiad�, Budapest, Hungary.