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001-es BibID:	BIBFORM107388
035-os BibID:	(Wos)000674274600001 (Scopus)85112868977
Első szerző:	Horváth Dávid (vegyész)
Cím:	Towards 213 Bi alpha-therapeutics and beyond: unravelling the foundations of efficient Bi III complexation by DOTP / Dávid Horváth, Fabio Travagin, Nicol Guidolin, Federica Buonsanti, Gyula Tircsó, Imre Tóth, Frank Bruchertseifer, Alfred Morgenstern, Johannes Notni, Giovanni B. Giovenzana, Zsolt Baranyai
Dátum:	2021
ISSN:	2052-1553
Megjegyzések:	Bismuth isotopes are attracting increasing attention for their potential applications in diagnostics and therapy. The emerging use of 213Bi in targeted alpha-therapy (TAT) is a particularly relevant example because it is available from radionuclide generators. A fast formation of stable BiIII-complexes is important for the safe and efficient preparation of labelled (bio)conjugates. Macrocyclic chelating agents are currently the best choice in terms of stability of the corresponding BiIII-complexes. In this work, a thorough study of the thermodynamics and kinetics of formation of BiIII-DOTP including radio-labelling and the comparison with the congener BiIII-DOTA is undertaken. The BiIII-DOTP complex is characterised by a fast formation kinetics (kBi(H2DOTP) = 0.33 s-1), an outstanding thermodynamic stability (log KBiDOTP = 38.67) and an impressive kinetic inertness (t1/2pH=3 = 47 600 h). The results clearly demonstrate that DOTP is a better chelating agent for BiIII both in terms of thermodynamic stability and in terms of kinetics of formation, with clear advantages in the radiolabelling of short-lived bismuth isotopes.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Inorganic Chemistry Frontiers. - 8 : 16 (2021), p. 3893-3904. -
További szerzők:	Travagin, Fabio Guidolin, Nicol Buonsanti, Federica Tircsó Gyula (1977-) (vegyész, kémia tanár) Tóth Imre (1950-) (vegyész) Bruchertseifer, Frank Morgenstern, Alfred Notni, Johannes Giovenzana, Giovanni Battista Baranyai Zsolt (1977-) (vegyész)
Pályázati támogatás:	K-128201 OTKA K-120224 OTKA K-134694 OTKA GINOP-2.3.2-15-2016-00008 GINOP
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001-es BibID:	BIBFORM103676
035-os BibID:	(WOS)000861647800001 (Scopus)85139120995
Első szerző:	Horváth Dávid (vegyész)
Cím:	Boosting Bismuth(III) Complexation for Targeted [alfa]-Therapy (TAT) Applications with the Mesocyclic Chelating Agent AAZTA / Horváth Dávid, Vágner Adrienn, Szikra Dezső, Trencsényi György, Demitri Nicola, Guidolin Nicol, Maiocchi Alessandro, Ghiani Simona, Travagin Fabio, Giovenzana Giovanni Battista, Baranyai Zsolt
Dátum:	2022
ISSN:	1433-7851 1521-3773
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Angewandte Chemie-International Edition. - 61 : 43 (2022), p. 1-9. -
További szerzők:	Vágner Adrienn (1990-) (vegyész, kémikus) Szikra Dezső Péter (1983-) (vegyész) Trencsényi György (1978-) (biológus, biokémikus, molekuláris biológus) Demitri, Nicola Guidolin, Nicol Maiocchi, Alessandro (vegyész) Ghiani, Simona (vegyész) Travagin, Fabio Giovenzana, Giovanni Battista Baranyai Zsolt (1977-) (vegyész)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM120527
035-os BibID:	(Scopus)85098230327 (WoS)000602621300001
Első szerző:	Kock, Flávio Vinicius Crizóstomo
Cím:	[Gd(AAZTA)]- Derivatives with n-Alkyl Acid Side Chains Show Improved Properties for Their Application as MRI Contrast Agents** / Flávio Vinicius Crizóstomo Kock, Attila Forgács, Nicol Guidolin, Rachele Stefania, Adrienn V#gner, Eliana Gianolio, Silvio Aime, Zsolt Baranyai
Dátum:	2021
ISSN:	0947-6539 1521-3765
Megjegyzések:	Herein, the synthesis and an extensive characterization of two novel Gd(AAZTA) (AAZTA=6-amino-6-methylperhydro-1,4-diazepine tetra acetic acid) derivatives functionalized with short (C-2 and C-4) n-alkyl acid functions are reported. The carboxylate functionality is the site for further conjugations for the design of more specific contrast agents (CAs). Interestingly, it has been found that the synthesized complexes display enhanced properties for use as MRI contrast agents on their own. The stability constants determined by using potentiometric titration and UV/Vis spectrophotometry were slightly higher than the one reported for the parent Gd(AAZTA) complex. This observation might be accounted for by the larger sigma-electron donation of the acyl substituents with respect to the one provided by the methyl group in the parent complex. As far as concerns the kinetic stability, transmetallation experiments with endogenous ions (e.g. Cu2+) implied that the Gd3+ ions present in these Gd(AAZTA) derivatives show somewhat smaller susceptibility to chemical exchange towards these ions at 25 degrees C, close to the physiological condition. The H-1 NMR spectra of the complexes with Eu-III and Yb-III displayed a set of signals consistent with half the number of methylene protons present on each ligand. The number of resonances was invariant over a large range of temperatures, suggesting the occurrence of a fast interconversion between structural isomers. The relaxivity values (298 K, 20 MHz) were consistent with q=2 being equal to 8.8 mm(-1) s(-1) for the C-2 derivative and 9.4 mm(-1) s(-1) for the C-4 one, that is, sensibly larger than the one reported for Gd(AAZTA) (7.1 mm(-1) s(-1)). Variable-temperature (VT)-T-2 O-17 NMR measurements showed, for both complexes, the presence of two populations of coordinated water molecules, one in fast and one in slow exchange with the bulk water. As the high-resolution H-1 NMR spectra of the analogs with Eu-III and Yb-III did not show the occurrence of distinct isomers (as frequently observed in other macrocyclic lanthanide(III)-containing complexes), we surmised the presence of two fast-interconverting isomers in solution. The analysis of the O-17 NMR VT-T-2 profiles versus temperature allowed their relative molar fraction to be established as 35 % for the isomer with the fast exchanging water and 65 % for the isomer with the water molecules in slower exchange. Finally, H-1 NMRD profiles over an extended range of applied magnetic field strengths have been satisfactory fitted on the basis of the occurrence of the two interconverting species.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk contrast agents kinetics lanthanides ligands MRI relaxation thermodynamic
Megjelenés:	Chemistry-A European Journal. - 27 : 5 (2021), p. 1849-1859. -
További szerzők:	Forgács Attila (1988-) (vegyész) Guidolin, Nicol Stefania, Rachele Vágner Adrienn Gianolio, Eliana Aime, Silvio Baranyai Zsolt (1977-) (vegyész)
Pályázati támogatás:	GINOP-2.3.2-15-2016-00008 GINOP
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