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Guzelj S, Šišić M, Bizjak Š, Frkanec L, Frkanec R, Jakopin Ž. Lipidation of NOD2 Agonists with Adamantane and Stearoyl Moieties Differentially Regulates Their In Vivo Adjuvant Activity. Pharmaceutics 2022; 14:pharmaceutics14122755. [PMID: 36559249 PMCID: PMC9785857 DOI: 10.3390/pharmaceutics14122755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/30/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
NOD2 is an innate immune receptor that constitutes an important target for the development of small molecule immunopotentiators with great potential to be used as vaccine adjuvants. We report here the results of an in vivo study of the adjuvant properties of a desmuramylpeptide NOD2 agonist SG29 and its lipidated analogs featuring an adamantyl moiety or a stearoyl group. These compounds have been synthesized, incorporated into liposomes, and evaluated for their in vivo adjuvant activity. The characterization of liposome formulations of examined compounds revealed that their size increased in comparison to that of empty liposomes. The introduction of a stearoyl or an adamantane lipophilic anchor into the structure of SG29, to produce SG115 and ZSB63, respectively, substantially improved the in vivo adjuvant activity. Of note, the attachment of the stearoyl moiety produced a Th2-biased immune response, while the incorporation of the adamantyl moiety greatly enhanced the production of total IgG but mostly augmented the production of IgG2a antibodies, which indicated a shift toward a Th1 immune response. The identified bona fide capacity of ZSB63 to initiate a cellular immune response thus highlights its untapped potential as an alternative vaccine adjuvant.
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Affiliation(s)
- Samo Guzelj
- Faculty of Pharmacy, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Marcela Šišić
- Centre for Research and Knowledge Transfer in Biotechnology, University of Zagreb, 10000 Zagreb, Croatia
| | - Špela Bizjak
- Faculty of Pharmacy, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Leo Frkanec
- Rudjer Bošković Institute, 10000 Zagreb, Croatia
| | - Ruža Frkanec
- Centre for Research and Knowledge Transfer in Biotechnology, University of Zagreb, 10000 Zagreb, Croatia
- Correspondence: (R.F.); (Ž.J.)
| | - Žiga Jakopin
- Faculty of Pharmacy, University of Ljubljana, SI-1000 Ljubljana, Slovenia
- Correspondence: (R.F.); (Ž.J.)
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2
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Šantić A, Brinkkötter M, Portada T, Frkanec L, Cramer C, Schönhoff M, Moguš-Milanković A. Correction: Supramolecular ionogels prepared with bis(amino alcohol)oxamides as gelators: ionic transport and mechanical properties. RSC Adv 2020; 10:20195. [PMID: 35520407 PMCID: PMC9054244 DOI: 10.1039/d0ra90061c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 05/14/2020] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘Supramolecular ionogels prepared with bis(amino alcohol)oxamides as gelators: ionic transport and mechanical properties’ by Ana Šantić et al., RSC Adv., 2020, 10, 17070–17078, DOI: 10.1039/D0RA01249A.
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Affiliation(s)
- Ana Šantić
- Laboratory for Functional Materials, Division of Materials Chemistry, Ruđer Bošković Institute Bijenička c. 54 10000 Zagreb Croatia
| | - Marc Brinkkötter
- Institute of Physical Chemistry, University of Muenster Corrensstraße 28/30 48149 Münster Germany
| | - Tomislav Portada
- Laboratory of Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute Bijenička c. 54 10000 Zagreb Croatia
| | - Leo Frkanec
- Laboratory of Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute Bijenička c. 54 10000 Zagreb Croatia
| | - Cornelia Cramer
- Institute of Physical Chemistry, University of Muenster Corrensstraße 28/30 48149 Münster Germany
| | - Monika Schönhoff
- Institute of Physical Chemistry, University of Muenster Corrensstraße 28/30 48149 Münster Germany
| | - Andrea Moguš-Milanković
- Laboratory for Functional Materials, Division of Materials Chemistry, Ruđer Bošković Institute Bijenička c. 54 10000 Zagreb Croatia
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3
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Šantić A, Brinkkötter M, Portada T, Frkanec L, Cremer C, Schönhoff M, Moguš-Milanković A. Supramolecular ionogels prepared with bis(amino alcohol)oxamides as gelators: ionic transport and mechanical properties. RSC Adv 2020; 10:17070-17078. [PMID: 35496933 PMCID: PMC9053178 DOI: 10.1039/d0ra01249a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 05/27/2020] [Accepted: 04/21/2020] [Indexed: 12/12/2022] Open
Abstract
Novel supramolecular ionogels with high ionic conductivity and variable mechanical strength prepared by gelation of ionic liquid [C4mim][N(Tf)2] with (S,S)-bis(phenylalaninol)oxamide.
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Affiliation(s)
- Ana Šantić
- Laboratory for Functional Materials
- Division of Materials Chemistry
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
| | - Marc Brinkkötter
- Institute of Physical Chemistry
- University of Muenster
- 48149 Münster
- Germany
| | - Tomislav Portada
- Laboratory of Supramolecular Chemistry
- Division of Organic Chemistry and Biochemistry
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
| | - Leo Frkanec
- Laboratory of Supramolecular Chemistry
- Division of Organic Chemistry and Biochemistry
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
| | - Cornelia Cremer
- Institute of Physical Chemistry
- University of Muenster
- 48149 Münster
- Germany
| | - Monika Schönhoff
- Institute of Physical Chemistry
- University of Muenster
- 48149 Münster
- Germany
| | - Andrea Moguš-Milanković
- Laboratory for Functional Materials
- Division of Materials Chemistry
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
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4
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Tranfić Bakić M, Klarić D, Espinosa MS, Kazazić S, Frkanec L, Babay PA, Galić N. Syntheses of ester and amide derivatives of calix[6]arene and their complexation affinities towards La3+, Eu3+, and Yb3+. Supramol Chem 2019. [DOI: 10.1080/10610278.2019.1650179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Marina Tranfić Bakić
- Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
| | - David Klarić
- Department of Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia
| | - Maria Soledad Espinosa
- Department of Analytical Chemistry, National Commission of Atomic Energy, Buenos Aires, Argentina
| | - Saša Kazazić
- Division of Physical Chemistry, Ruđer Bošković Institute, Zagreb, Croatia
| | - Leo Frkanec
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Zagreb, Croatia
| | - Paola Alejandra Babay
- Department of Analytical Chemistry, National Commission of Atomic Energy, Buenos Aires, Argentina
| | - Nives Galić
- Department of Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia
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5
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Štimac A, Tokić M, Ljubetič A, Vuletić T, Šekutor M, PoŽar J, Leko K, HanŽevački M, Frkanec L, Frkanec R. Functional self-assembled nanovesicles based on β-cyclodextrin, liposomes and adamantyl guanidines as potential nonviral gene delivery vectors. Org Biomol Chem 2019; 17:4640-4651. [PMID: 31020307 DOI: 10.1039/c9ob00488b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Multicomponent self-assembled supramolecular nanovesicles based on an amphiphilic derivative of β-cyclodextrin and phosphatidylcholine liposomes (PC-liposomes) functionalized with four structurally different adamantyl guanidines were prepared and characterized. Incorporation efficiency of the examined adamantyl guanidines as well as size and surface charge of the prepared supramolecular nanovesicles was determined. Changes in the surface charge of the prepared nanovesicles confirmed that guanidinium groups were exposed on the surface. ITC and 1H NMR spectroscopy complemented by molecular dynamics (MD) simulations were used to elucidate the structural data and stability of the inclusion complexes of β-cyclodextrin and adamantyl guanidines (AG1-5). The results are consistent and point to a significant contribution of the guanylhydrazone residue to the complexation process for AG1 and AG2 with β-cyclodextrin. In order to evaluate the potential of the self-assembled supramolecular nanomaterial as a nonviral gene delivery vector, fluorescence correlation spectroscopy was used. It showed that the prepared nanovesicles functionalized with adamantyl guanidines AG1-4 effectively recognize and bind the fluorescently labelled DNA. Furthermore, gel electrophoretic assay confirmed the formation of nanoplexes of functionalized nanovesicles and plasmid DNA. These findings together suggest that the designed supramolecular nanovesicles could be successfully applied as nonviral gene delivery vectors.
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Affiliation(s)
- Adela Štimac
- Centre for Research and Knowledge Transfer in Biotechnology, University of Zagreb, Rockefellerova 10, 10 000 Zagreb, Croatia.
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Cindro N, Požar J, Barišić D, Bregović N, Pičuljan K, Tomaš R, Frkanec L, Tomišić V. Neutral glycoconjugated amide-based calix[4]arenes: complexation of alkali metal cations in water. Org Biomol Chem 2019; 16:904-912. [PMID: 29308493 DOI: 10.1039/c7ob02955a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cation complexation in water presents a unique challenge in calixarene chemistry, mostly due to the fact that a vast majority of calixarene-based cation receptors is not soluble in water or their solubility has been achieved by introducing functionalities capable of (de)protonation. Such an approach inevitably involves the presence of counterions which compete with target cations for the calixarene binding site, and also rather often requires the use of ion-containing buffer solutions in order to control the pH. Herein we devised a new strategy towards the solution of this problem, based on introducing carbohydrate units at the lower or upper rim of calix[4]arenes which comprise efficient cation binding sites. In this context, we prepared neutral, water-soluble receptors with secondary or tertiary amide coordinating groups, and studied their complexation with alkali metal cations in aqueous and methanol (for the comparison purpose) solutions. Complexation thermodynamics was quantitatively characterized by UV spectrometry and isothermal titration calorimetry, revealing that one of the prepared tertiary amide derivatives is capable of remarkably efficient (log K ≈ 5) and selective binding of sodium cations among alkali metal cations in water. Given the ease of the synthetic procedure used, and thus the variety of accessible analogues, this study can serve as a platform for the development of reagents for diverse purposes in aqueous media.
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Affiliation(s)
- Nikola Cindro
- Department of Chemistry Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
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7
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Dabić D, Brkljačić L, Tandarić T, Žinić M, Vianello R, Frkanec L, Kobetić R. The Metal Effect on Self-Assembling of Oxalamide Gelators Explored by Mass Spectrometry and DFT Calculations. J Am Soc Mass Spectrom 2018; 29:103-113. [PMID: 29086338 DOI: 10.1007/s13361-017-1834-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 10/02/2017] [Accepted: 10/10/2017] [Indexed: 06/07/2023]
Abstract
Gels formed by self-assembly of small organic molecules are of wide interest as dynamic soft materials with numerous possible applications, especially in terms of nanotechnology for functional and responsive biomaterials, biosensors, and nanowires. Four bis-oxalamides were chosen to show if electrospray ionization mass spectrometry (ESI-MS) could be used as a prediction of a good gelator and also to shed light on the gelation processes. By inspecting the gelation of several solvent, we showed that bis(amino acid)oxalamide 1 proved to be the most efficient, also being able of forming the largest observable assemblies in the gas phase. The formation of singly charged assemblies holding from one up to six monomer units is the outcome of the strong intermolecular H-bonds, particularly among terminal carboxyl groups. The variation of solvents from polar aprotic towards polar protic did not have any significant effects on the size of the assemblies. The addition of a salt such as NaOAc or Mg(OAc)2, depending on the concentration, altered the assembling. Computational analysis at the DFT level aided in the interpretation of the observed trends and revealed that individual gelator molecules spontaneously assemble to higher aggregates, but the presence of the Na+ cation disrupts any gelator organization since it becomes significantly more favorable for gelator molecules to bind Na+ cations up to the 3:1 ratio than to self-assemble, being fully in line with experimental observations reported here. Graphical Abstract ᅟ.
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Affiliation(s)
- Dario Dabić
- Department of Analytical Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000, Zagreb, Croatia
| | - Lidija Brkljačić
- Laboratory for Carbohydrate, Peptide and Glycopeptide Research, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Tana Tandarić
- Computational Organic Chemistry and Biochemistry Group, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Mladen Žinić
- Laboratory of Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Robert Vianello
- Computational Organic Chemistry and Biochemistry Group, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia.
| | - Leo Frkanec
- Laboratory of Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia.
| | - Renata Kobetić
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia.
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8
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Štimac A, Lapić J, Blasina V, Lukinac M, Djaković S, Crnolatac I, Frkanec L, Frkanec R. Adamantyl ferrocene derivatives: Antioxidant abilities and effects on model lipid membranes. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Adela Štimac
- University of Zagreb, Centre for Research and Knowledge Transfer in Biotechnology Rockefellerova 10 10000 Zagreb Croatia
| | - Jasmina Lapić
- Faculty of Food Technology and BiotechnologyUniversity of Zagreb Pierottijeva 6 10000 Zagreb Croatia
| | - Valentino Blasina
- Faculty of Food Technology and BiotechnologyUniversity of Zagreb Pierottijeva 6 10000 Zagreb Croatia
| | - Marija Lukinac
- Faculty of Food Technology and BiotechnologyUniversity of Zagreb Pierottijeva 6 10000 Zagreb Croatia
| | - Senka Djaković
- Faculty of Food Technology and BiotechnologyUniversity of Zagreb Pierottijeva 6 10000 Zagreb Croatia
| | - Ivo Crnolatac
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and BiochemistryRuđer Bošković Institute Bijenička 54 10000 Zagreb Croatia
| | - Leo Frkanec
- Laboratory for Supramolecular Chemistry, Division of Organic Chemistry and BiochemistryRuđer Bošković Institute Bijenička 54 10000 Zagreb Croatia
| | - Ruža Frkanec
- University of Zagreb, Centre for Research and Knowledge Transfer in Biotechnology Rockefellerova 10 10000 Zagreb Croatia
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9
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Horvat G, Frkanec L, Cindro N, Tomišić V. A comprehensive study of the complexation of alkali metal cations by lower rim calix[4]arene amide derivatives. Phys Chem Chem Phys 2017; 19:24316-24329. [PMID: 28849809 DOI: 10.1039/c7cp03920d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complexation of alkali metal cations by lower rim N,N-dihexylacetamide (L1) and newly synthesized N-hexyl-N-methylacetamide (L2) calix[4]arene tertiary-amide derivatives was thoroughly studied at 25 °C in acetonitrile (MeCN), benzonitrile (PhCN), and methanol (MeOH) by means of direct and competitive microcalorimetric titrations, and UV and 1H NMR spectroscopies. In addition, by measuring the ligands' solubilities, the solution (transfer) Gibbs energies of the ligands and their alkali metal complexes were obtained. The inclusion of solvent molecules in the free and complexed calixarene hydrophobic cavities was also investigated. Computational (classical molecular dynamics) investigations of the studied systems were also carried out. The obtained results were compared with those previously obtained by studying the complexation ability of an N-hexylacetamidecalix[4]arene secondary-amide derivative (L3). The stability constants of 1 : 1 complexes were determined in all solvents used (the values obtained by different methods being in excellent agreement), as were the corresponding complexation enthalpies and entropies. Almost all of the examined reactions were enthalpically controlled. The most striking exceptions were reactions of Li+ with both ligands in methanol, for which the entropic contribution to the reaction Gibbs energy was substantial due the entropically favourable desolvation of the smallest lithium cation. The thermodynamic stabilities of the complexes were quite solvent dependent (the stability decreased in the solvent order: MeCN > PhCN ≫ MeOH), which could be accounted for by considering the differences in the solvation of the ligand and free and complexed alkali metal cations in the solvents used. Comparison of the stability constants of the ligand L1 and L2 complexes clearly revealed that the higher electron-donating ability of the hexyl with respect to the methyl group is of considerable importance in determining the equilibria of the complexation reactions. Additionally, the quite strong influence of intramolecular hydrogen bond formation in compound L3 (not present in ligands L1 and L2) and that of the inclusion of solvent molecules in the calixarene hydrophobic cone were shown to be of great importance in determining the thermodynamic stability of the calixarene-cation complexes. The experimental results were fully supported by those obtained by MD simulations.
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Affiliation(s)
- Gordan Horvat
- Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
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10
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Požar J, Nikšić-Franjić I, Cvetnić M, Leko K, Cindro N, Pičuljan K, Borilović I, Frkanec L, Tomišić V. Solvation Effect on Complexation of Alkali Metal Cations by a Calix[4]arene Ketone Derivative. J Phys Chem B 2017; 121:8539-8550. [DOI: 10.1021/acs.jpcb.7b05093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Josip Požar
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Ivana Nikšić-Franjić
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Marija Cvetnić
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Katarina Leko
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Nikola Cindro
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Katarina Pičuljan
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Ivana Borilović
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
| | - Leo Frkanec
- Department
of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Vladislav Tomišić
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000 Zagreb, Croatia
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Bregović N, Cindro N, Bertoša B, Barišić D, Frkanec L, Užarević K, Tomišić V. Dehydroacetic Acid Derivatives Bearing Amide or Urea Moieties as Effective Anion Receptors. Chemistry 2017; 23:10396-10406. [PMID: 28493492 DOI: 10.1002/chem.201701677] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Indexed: 01/07/2023]
Abstract
Derivatives of dehydroacetic acid comprising amide or urea subunits have been synthesized and their anion-binding properties investigated. Among a series of halides and oxyanions, the studied compounds selectively bind acetate and dihydrogen phosphate in acetonitrile and dimethyl sulfoxide. The corresponding complexation processes were characterized by means of 1 H NMR titrations, which revealed a 1:1 complex stoichiometry in most cases, with the exception of dihydrogen phosphate, which formed 2:1 (anion/ligand) complexes in acetonitrile. The complex stability constants were determined and are discussed with respect to the structural properties of the receptors, the hydrogen-bond-forming potential of the anions, and the characteristics of the solvents used. Based on the spectroscopic data and results of Monte Carlo simulations, the amide or urea groups were affirmed as the primary binding sites in all cases. The results of the computational methods indicate that an array of both inter- and intramolecular hydrogen bonds can form in the studied systems, and these were shown to play an important role in defining the overall stability of the complexes. Solubility measurements were carried out in both solvents and the thermodynamics of transfer from acetonitrile to dimethyl sulfoxide were characterized on a quantitative level. This has afforded a detailed insight into the impact of the medium on the complexation reactions.
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Affiliation(s)
- Nikola Bregović
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Nikola Cindro
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Branimir Bertoša
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Dajana Barišić
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
| | - Leo Frkanec
- Laboratory for Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
| | - Krunoslav Užarević
- Laboratory for Green Synthesis, Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
| | - Vladislav Tomišić
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
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Štimac A, Šekutor M, Mlinarić-Majerski K, Frkanec L, Frkanec R. Adamantane in Drug Delivery Systems and Surface Recognition. Molecules 2017; 22:molecules22020297. [PMID: 28212339 PMCID: PMC6155684 DOI: 10.3390/molecules22020297] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 01/19/2017] [Accepted: 02/11/2017] [Indexed: 11/30/2022] Open
Abstract
The adamantane moiety is widely applied in design and synthesis of new drug delivery systems and in surface recognition studies. This review focuses on liposomes, cyclodextrins, and dendrimers based on or incorporating adamantane derivatives. Our recent concept of adamantane as an anchor in the lipid bilayer of liposomes has promising applications in the field of targeted drug delivery and surface recognition. The results reported here encourage the development of novel adamantane-based structures and self-assembled supramolecular systems for basic chemical investigations as well as for biomedical application.
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Affiliation(s)
- Adela Štimac
- University of Zagreb, Centre for Research and Knowledge Transfer in Biotechnology, Rockefellerova 10, 10000 Zagreb, Croatia.
| | - Marina Šekutor
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
| | - Kata Mlinarić-Majerski
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
| | - Leo Frkanec
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
| | - Ruža Frkanec
- University of Zagreb, Centre for Research and Knowledge Transfer in Biotechnology, Rockefellerova 10, 10000 Zagreb, Croatia.
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13
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Štimac A, Bendelja K, Dutour Sikirić M, Frkanec L, Frkanec R. Mannosylated Liposomes with Built-in Peptidoglycan Based Immunomodulators for Subunit Vaccine Formulations. CROAT CHEM ACTA 2017. [DOI: 10.5562/cca3309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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14
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Tranfić Bakić M, Leko K, Cindro N, Portada T, Hrenar T, Frkanec L, Horvat G, Požar J, Tomišić V. Synthesis of Fluorescent Diphenylantracene-Based Calix[4]arene Derivatives and their Complexation with Alkali Metal Cations. CROAT CHEM ACTA 2017. [DOI: 10.5562/cca3308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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15
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Tranfić Bakić M, Espinosa MS, Cindro N, Frkanec L, Babay PA, Galić N. UV-Vis and ESI MS/MS Study of Calix[4]arene Derivatives and Their Lanthanide Complexes. CROAT CHEM ACTA 2017. [DOI: 10.5562/cca3288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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16
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Pospišil T, Ferhatović Hamzić L, Brkić Ahmed L, Lovrić M, Gajović S, Frkanec L. Synthesis, characterization and in vitro biocompatibility assessment of a novel tripeptide hydrogelator, as a promising scaffold for tissue engineering applications. Biomater Sci 2016; 4:1412-6. [PMID: 27508285 DOI: 10.1039/c6bm00287k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We have synthesized and characterized a self-assembling tripeptide hydrogelator Ac-l-Phe-l-Phe-l-Ala-NH2. A series of experiments showed that the hydrogel material could serve as a stabile and biocompatible physical support as it improves the survival of HEK293T cells in vitro, thus being a promising biomaterial for use in tissue engineering applications.
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Affiliation(s)
- Tihomir Pospišil
- Laboratory for Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia.
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Štimac A, Cvitaš JT, Frkanec L, Vugrek O, Frkanec R. Design and syntheses of mono and multivalent mannosyl-lipoconjugates for targeted liposomal drug delivery. Int J Pharm 2016; 511:44-56. [PMID: 27363934 DOI: 10.1016/j.ijpharm.2016.06.123] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/23/2016] [Accepted: 06/26/2016] [Indexed: 12/21/2022]
Abstract
Multivalent mannosyl-lipoconjugates may be of interest for glycosylation of liposomes and targeted drug delivery because the mannose specifically binds to C-type lectin receptors on the particular cells. In this paper syntheses of two types of novel O-mannosides are presented. Conjugates 1 and 2 with a COOH- and NH2-functionalized spacer and the connection to a lysine and FmocNH-PEG-COOH, are described. The coupling reactions of prepared intermediates 6 and 4 with a PEGylated-DSPE or palmitic acid, respectively, are presented. Compounds 5, mono-, 8, di- and 12, tetravalent mannosyl-lipoconjugates, were synthesized. The synthesized compounds were incorporated into liposomes and liposomal preparations featuring exposed mannose units were characterized. Carbohydrate liposomal quartz crystal microbalance based assay has been established for studying carbohydrate-lectin binding. It was demonstrated that liposomes with incorporated mannosyl-lipoconjugates were effectively recognized by Con A and have great potential to be used for targeted liposomal drug delivery systems.
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Affiliation(s)
- Adela Štimac
- University of Zagreb, Centre for Research and Knowledge Transfer in Biotechnology, Rockefellerova 10, 10000 Zagreb, Croatia
| | | | - Leo Frkanec
- Institute Rudjer BoškoviĿ, BijeniĿka cesta 54, 10000 Zagreb, Croatia
| | - Oliver Vugrek
- Institute Rudjer BoškoviĿ, BijeniĿka cesta 54, 10000 Zagreb, Croatia
| | - Ruža Frkanec
- University of Zagreb, Centre for Research and Knowledge Transfer in Biotechnology, Rockefellerova 10, 10000 Zagreb, Croatia.
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18
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Bregović N, Cindro N, Frkanec L, Tomišić V. Complexation of fluoride anion and its ion pairs with alkali metal cations by tetra-substituted lower rim calix[4]arene tryptophan derivative. Supramol Chem 2016. [DOI: 10.1080/10610278.2016.1154147] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Nikola Bregović
- Faculty of Science, Department of Physical Chemistry, Zagreb, Croatia
| | - Nikola Cindro
- Faculty of Science, Department of Physical Chemistry, Zagreb, Croatia
| | - Leo Frkanec
- Laboratory of Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, Zagreb, Croatia
| | - Vladislav Tomišić
- Faculty of Science, Department of Physical Chemistry, Zagreb, Croatia
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19
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Stipić F, Burić P, Jakšić Ž, Pletikapić G, Dutour Sikirić M, Zgrablić G, Frkanec L, Lyons DM. Antibody-based donor-acceptor spatial reconfiguration in decorated lanthanide-doped nanoparticle colloids for the quantification of okadaic acid biotoxin. Colloids Surf B Biointerfaces 2015; 135:481-489. [PMID: 26283497 DOI: 10.1016/j.colsurfb.2015.07.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 07/04/2015] [Accepted: 07/28/2015] [Indexed: 10/23/2022]
Abstract
With the increasing movement away from the mouse bioassay for the detection of toxins in commercially harvested shellfish, there is a growing demand for the development of new and potentially field-deployable tests in its place. In this direction we report the development of a simple and sensitive nanoparticle-based luminescence technique for the detection of the marine biotoxin okadaic acid. Photoluminescent lanthanide nanoparticles were conjugated with fluorophore-labelled anti-okadaic acid antibodies which, upon binding to okadaic acid, gave rise to luminescence resonance energy transfer from the nanoparticle to the organic fluorophore dye deriving from a reduction in distance between the two. The intensity ratio of the fluorophore: nanoparticle emission peaks was found to correlate with okadaic acid concentration, and the sensor showed a linear response in the 0.37-3.97 μM okadaic acid range with a limit of detection of 0.25 μM. This work may have important implications for the development of new, cheap, and versatile biosensors for a range of biomolecules and that are sufficiently simple to be applied in the field or at point-of-care.
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Affiliation(s)
- Filip Stipić
- Center for Marine Research, Ruđer Bošković Institute, G. Paliaga 5, 52210 Rovinj, Croatia
| | - Petra Burić
- Center for Marine Research, Ruđer Bošković Institute, G. Paliaga 5, 52210 Rovinj, Croatia
| | - Željko Jakšić
- Center for Marine Research, Ruđer Bošković Institute, G. Paliaga 5, 52210 Rovinj, Croatia
| | - Galja Pletikapić
- Department of Marine and Environmental Research, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Maja Dutour Sikirić
- Department of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Goran Zgrablić
- Time Resolved X-Ray Spectroscopy Laboratory, Elettra-Sincrotrone Trieste, 34149 Basovizza, Italy
| | - Leo Frkanec
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Daniel M Lyons
- Center for Marine Research, Ruđer Bošković Institute, G. Paliaga 5, 52210 Rovinj, Croatia.
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20
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Kokan Z, Perić B, Makarević J, Štefanić G, Frkanec L, Kirin SI. Crystal structure and gelation properties of naphthalene bioconjugates. Acta Crystallogr A Found Adv 2015. [DOI: 10.1107/s2053273315093389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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21
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Stipić F, Pletikapić G, Jakšić Ž, Frkanec L, Zgrablić G, Burić P, Lyons DM. Application of Functionalized Lanthanide-Based Nanoparticles for the Detection of Okadaic Acid-Specific Immunoglobulin G. J Phys Chem B 2015; 119:1259-64. [DOI: 10.1021/jp506382w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Filip Stipić
- Center
for Marine Research, Ruđer Bošković Institute, G. Paliaga
5, 52210 Rovinj, Croatia
| | | | - Željko Jakšić
- Center
for Marine Research, Ruđer Bošković Institute, G. Paliaga
5, 52210 Rovinj, Croatia
| | | | - Goran Zgrablić
- Time
Resolved X-ray Spectroscopy Laboratory, Elettra-Sincrotrone Trieste, 34149 Basovizza, Italy
| | - Petra Burić
- Center
for Marine Research, Ruđer Bošković Institute, G. Paliaga
5, 52210 Rovinj, Croatia
| | - Daniel M. Lyons
- Center
for Marine Research, Ruđer Bošković Institute, G. Paliaga
5, 52210 Rovinj, Croatia
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22
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Bakić MT, Jadreško D, Hrenar T, Horvat G, Požar J, Galić N, Sokol V, Tomaš R, Alihodžić S, Žinić M, Frkanec L, Tomišić V. Fluorescent phenanthridine-based calix[4]arene derivatives: synthesis and thermodynamic and computational studies of their complexation with alkali-metal cations. RSC Adv 2015. [DOI: 10.1039/c5ra01905b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The novel calix[4]arenes exhibiting prominent fluorescence were shown to be potential sensitive fluorimetric cation sensors. Comprehensive experimental and computational studies provided detailed insight into the corresponding complexation reactions.
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Affiliation(s)
- Marina Tranfić Bakić
- Department of Chemistry and Biochemistry
- Faculty of Food Technology and Biotechnology
- University of Zagreb
- 10000 Zagreb
- Croatia
| | | | - Tomica Hrenar
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Gordan Horvat
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Josip Požar
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Nives Galić
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Vesna Sokol
- Division of Chemistry
- Faculty of Chemistry and Technology
- University of Split
- 21000 Split
- Croatia
| | - Renato Tomaš
- Division of Chemistry
- Faculty of Chemistry and Technology
- University of Split
- 21000 Split
- Croatia
| | | | - Mladen Žinić
- Croatian Academy of Sciences and Arts
- Zagreb and Baltazar University of Applied Sciences
- 10290 Zaprešić
- Croatia
| | | | - Vladislav Tomišić
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
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23
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Sviben I, Galić N, Tomišić V, Frkanec L. Extraction and complexation of alkali and alkaline earth metal cations by lower-rim calix[4]arene diethylene glycol amide derivatives. NEW J CHEM 2015. [DOI: 10.1039/c5nj00805k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The metal-ion extraction abilities of calix[4]arene derivatives1and2are largely dependent on the type of the amide group forming the cation-binding site. Tertiary-amide derivative2was shown to be an excellent extractant for most alkali and alkaline earth cations.
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Affiliation(s)
- Igor Sviben
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Nives Galić
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Vladislav Tomišić
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Leo Frkanec
- Laboratory of Supramolecular and Nucleoside Chemistry
- Department of Organic Chemistry and Biochemistry
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
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24
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Bregović N, Cindro N, Frkanec L, Užarević K, Tomišić V. Thermodynamic Study of Dihydrogen Phosphate Dimerisation and Complexation with Novel Urea- and Thiourea-Based Receptors. Chemistry 2014; 20:15863-71. [DOI: 10.1002/chem.201404091] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Indexed: 11/06/2022]
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Horvat G, Stilinović V, Kaitner B, Frkanec L, Tomišić V. The Effect of Specific Solvent–Solute Interactions on Complexation of Alkali-Metal Cations by a Lower-Rim Calix[4]arene Amide Derivative. Inorg Chem 2013; 52:12702-12. [DOI: 10.1021/ic4019184] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gordan Horvat
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000, Zagreb, Croatia
| | - Vladimir Stilinović
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000, Zagreb, Croatia
| | - Branko Kaitner
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000, Zagreb, Croatia
| | - Leo Frkanec
- Laboratory of Supramolecular and Nucleoside Chemistry, Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička c. 54, 10000, Zagreb, Croatia
| | - Vladislav Tomišić
- Department
of Chemistry, Faculty of Science, University of Zagreb, Horvatovac
102a, 10000, Zagreb, Croatia
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26
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Horvat G, Stilinović V, Hrenar T, Kaitner B, Frkanec L, Tomišić V. An Integrated Approach (Thermodynamic, Structural, and Computational) to the Study of Complexation of Alkali-Metal Cations by a Lower-Rim Calix[4]arene Amide Derivative in Acetonitrile. Inorg Chem 2012; 51:6264-78. [DOI: 10.1021/ic300474s] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gordan Horvat
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Vladimir Stilinović
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Tomica Hrenar
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Branko Kaitner
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Leo Frkanec
- Laboratory of Supramolecular
and Nucleoside Chemistry, Department of Organic Chemistry
and Biochemistry, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia
| | - Vladislav Tomišić
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
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27
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Stimac A, Segota S, Dutour Sikirić M, Ribić R, Frkanec L, Svetličić V, Tomić S, Vranešić B, Frkanec R. Surface modified liposomes by mannosylated conjugates anchored via the adamantyl moiety in the lipid bilayer. Biochim Biophys Acta 2012; 1818:2252-9. [PMID: 22525598 DOI: 10.1016/j.bbamem.2012.04.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2012] [Revised: 04/04/2012] [Accepted: 04/09/2012] [Indexed: 10/28/2022]
Abstract
The aim of the present study was to encapsulate mannosylated 1-aminoadamantane and mannosylated adamantyltripeptides, namely [(2R)-N-(adamant-1-yl)-3-(α,β-d-mannopyranosyloxy)-2-methylpropanamide and (2R)-N-[3-(α-d-mannopyranosyloxy)-2-methylpropanoyl]-d,l-(adamant-2-yl)glycyl-l-alanyl-d-isoglutamine] in liposomes. The characterization of liposomes, size and surface morphology was performed using dynamic light scattering (DLS) and atomic force microscopy (AFM). The results have revealed that the encapsulation of examined compounds changes the size and surface of liposomes. After the concanavalin A (ConA) was added to the liposome preparation, increase in liposome size and their aggregation has been observed. The enlargement of liposomes was ascribed to the specific binding of the ConA to the mannose present on the surface of the prepared liposomes. Thus, it has been shown that the adamantyl moiety from mannosylated 1-aminoadamantane and mannosylated adamantyltripeptides can be used as an anchor in the lipid bilayer for carbohydrate moiety exposed on the liposome surface.
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Benković T, Tomišić V, Frkanec L, Galić N. ESI MS/MS Study of Calix[4]arene Derivatives and their Metal Complexes. CROAT CHEM ACTA 2012. [DOI: 10.5562/cca2125] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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29
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Požar J, Horvat G, Čalogović M, Galić N, Frkanec L, Tomišić V. Complexation of Oxonium and Ammonium Ions by Lower-rim Calix[4]arene Amino Acid Derivatives. CROAT CHEM ACTA 2012. [DOI: 10.5562/cca2172] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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30
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Galić N, Burić N, Tomaš R, Frkanec L, Tomišić V. Synthesis and cation binding properties of fluorescent calix[4]arene derivatives bearing tryptophan units at the lower rim. Supramol Chem 2011. [DOI: 10.1080/10610278.2010.521832] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Nives Galić
- a Department of Chemistry , Faculty of Science, University of Zagreb , Horvatovac 102a, 10000 , Zagreb , Croatia
| | - Nataša Burić
- a Department of Chemistry , Faculty of Science, University of Zagreb , Horvatovac 102a, 10000 , Zagreb , Croatia
| | - Renato Tomaš
- a Department of Chemistry , Faculty of Science, University of Zagreb , Horvatovac 102a, 10000 , Zagreb , Croatia
| | - Leo Frkanec
- b Department of Organic Chemistry and Biochemistry , Ruđer Bošković Institute , Bijenička 54, 10000 , Zagreb , Croatia
| | - Vladislav Tomišić
- a Department of Chemistry , Faculty of Science, University of Zagreb , Horvatovac 102a, 10000 , Zagreb , Croatia
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Makarević J, Jokić M, Frkanec L, Čaplar V, Šijaković Vujičić N, Žinić M. Oxalyl retro-peptide gelators. Synthesis, gelation properties and stereochemical effects. Beilstein J Org Chem 2010; 6:945-59. [PMID: 21085503 PMCID: PMC2981816 DOI: 10.3762/bjoc.6.106] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Accepted: 08/23/2010] [Indexed: 11/23/2022] Open
Abstract
In this work we report on gelation properties, self-assembly motifs, chirality effects and morphological characteristics of gels formed by chiral retro-dipeptidic gelators in the form of terminal diacids (1a-5a) and their dimethyl ester (1b-5b) and dicarboxamide (1c-5c) derivatives. Terminal free acid retro-dipeptides (S,S)-bis(LeuLeu) 1a, (S,S)-bis(PhgPhg) 3a and (S,S)-bis(PhePhe) 5a showed moderate to excellent gelation of highly polar water/DMSO and water/DMF solvent mixtures. Retro-peptides incorporating different amino acids (S,S)-(LeuPhg) 2a and (S,S)-(PhgLeu) 4a showed no or very weak gelation. Different gelation effectiveness was found for racemic and single enantiomer gelators. The heterochiral (S,R)-1c diastereoisomer is capable of immobilizing up to 10 and 4 times larger volumes of dichloromethane/DMSO and toluene/DMSO solvent mixtures compared to homochiral (S,S)-1c. Based on the results of (1)H NMR, FTIR, CD investigations, molecular modeling and XRPD studies of diasteroisomeric diesters (S,S)-1b/(S,R)-1b and diacids (S,S)-1b/(S,R)-1a, a basic packing model in their gel aggregates is proposed. The intermolecular hydrogen bonding between extended gelator molecules utilizing both, the oxalamide and peptidic units and layered organization were identified as the most likely motifs appearing in the gel aggregates. Molecular modeling studies of (S,S)-1a/(S,R)-1a and (S,S)-1b/(S,R)-1b diasteroisomeric pairs revealed a decisive stereochemical influence yielding distinctly different low energy conformations: those of (S,R)-diastereoisomers with lipophilic i-Bu groups and polar carboxylic acid or ester groups located on the opposite sides of the oxalamide plane resembling bola amphiphilic structures and those of (S,S)-diasteroisomers possessing the same groups located at both sides of the oxalamide plane. Such conformational characteristics were found to strongly influence both, gelator effectiveness and morphological characteristics of gel aggregates.
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Affiliation(s)
- Janja Makarević
- Laboratory for Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, P.O.B. 180, HR-10002 Zagreb, Croatia
| | - Milan Jokić
- Laboratory for Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, P.O.B. 180, HR-10002 Zagreb, Croatia
| | - Leo Frkanec
- Laboratory for Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, P.O.B. 180, HR-10002 Zagreb, Croatia
| | - Vesna Čaplar
- Laboratory for Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, P.O.B. 180, HR-10002 Zagreb, Croatia
| | - Nataša Šijaković Vujičić
- Laboratory for Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, P.O.B. 180, HR-10002 Zagreb, Croatia
| | - Mladen Žinić
- Laboratory for Supramolecular and Nucleoside Chemistry, Ruđer Bošković Institute, P.O.B. 180, HR-10002 Zagreb, Croatia
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Stilinović V, Frkanec L, Kaitner B. ( R, S)-3-Carboxy-2-(isoquinolinium-2-yl)propanoate monohydrate. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o1427. [PMID: 21579503 PMCID: PMC2979612 DOI: 10.1107/s1600536810018428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Accepted: 05/18/2010] [Indexed: 11/11/2022]
Abstract
The title compound, C13H11NO4·H2O, is a monohydrate of a betaine exhibiting a positively charged N-substituted isoquinoline group and a deprotonated carboxyl group. In the crystal, molecules are connected via short O—H⋯O hydrogen bonds between protonated and deprotonated carboxyl groups into chains of either R or S enantiomers along [001]. These chains are additionally connected by hydrogen bonding between water molecules and the deprotonated carboxy groups of neighbouring molecules.
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Caplar V, Frkanec L, Sijaković Vujicić N, Zinić M. Positionally isomeric organic gelators: structure-gelation study, racemic versus enantiomeric gelators, and solvation effects. Chemistry 2010; 16:3066-82. [PMID: 20119987 DOI: 10.1002/chem.200902342] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Low molecular weight gelator molecules consisting of aliphatic acid, amino acid (phenylglycine), and omega-aminoaliphatic acid units have been designed. By varying the number of methylene units in the aliphatic and omega-aminoaliphatic acid chains, as defined by descriptors m and n, respectively, a series of positionally isomeric gelators having different positions of the peptidic hydrogen-bonding unit within the gelator molecule has been obtained. The gelation properties of the positional isomers have been determined in relation to a defined set of twenty solvents of different structure and polarity and analyzed in terms of gelator versatility (G(ver)) and effectiveness (G(eff)). The results of gelation tests have shown that simple synthetic optimizations of a "lead gelator molecule" by variation of m and n, end-group polarity (carboxylic acid versus sodium carboxylate), and stereochemistry (racemate versus optically pure form) allowed the identification of gelators with tremendously improved versatility (G(ver)) and effectiveness (G(eff)). Dramatic differences in G(eff) values of up to 70 times could be observed between pure racemate/enantiomer pairs of some gelators, which were manifested even in the gelation of very similar solvents such as isomeric xylenes. The combined results of spectroscopic ((1)H NMR, FTIR), electron microscopy (TEM), and X-ray diffraction studies suggest similar organization of the positionally isomeric gelators at the molecular level, comprising parallel beta-sheet hydrogen-bonded primary assemblies that form inversed bilayers at a higher organizational level. Differential scanning calorimetry (DSC) studies of selected enantiomer/racemate gelator pairs and their o- and p-xylene gels revealed the simultaneous presence of different polymorphs in the racemate gels. The increased gelation effectiveness of the racemate compared to that of the single enantiomer is most likely a consequence of its spontaneous resolution into enantiomeric bilayers and their subsequent organization into polymorphic aggregates of different energy. The latter determine the gel fiber thickness and solvent immobilization capacity of the formed gel network.
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Affiliation(s)
- Vesna Caplar
- Division of Organic Chemistry and Biochemistry, Laboratory for Supramolecular and Nucleoside Chemistry, Ruder Bosković Institute, P.O.B. 180, 10002 Zagreb, Croatia
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Frkanec L, Žinić M. Chiral bis(amino acid)- and bis(amino alcohol)-oxalamidegelators. Gelation properties, self-assembly motifs and chirality effects. Chem Commun (Camb) 2010; 46:522-37. [DOI: 10.1039/b920353m] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Crown ethers are of enormous interest and importance in chemistry, biochemistry, materials science, catalysis, separation, transport and encapsulated processes, as well as in the design and synthesis of various synthetic systems with specific properties, diverse capabilities, and programmable functions. Classical crown ethers are macrocyclic polyethers that contain 3-20 oxygen atoms separated from each other by two or more carbon atoms. They are exceptionally versatile in selectively binding a range of metal ions and a variety of organic neutral and ionic species. Crown ethers are currently being studied and used in a variety of applications beyond their traditional place in chemistry. This review presents additional applications and the ever-increasing biomedical potentials of these intriguing compounds, with particular emphasis on the prospects of their relevance as anticancer agents. We believe that further research in this direction should be encouraged, as crown compounds could either induce toxicities that are different from those of conventional antitumor drugs, or complement drugs in current use, thereby providing a valuable adjunct to therapy.
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Affiliation(s)
- Marijeta Kralj
- Division of Molecular Medicine, Ruder Bosković Institute, Bijenicka cesta 54, 10002 Zagreb, Croatia.
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Marjanović M, Kralj M, Supek F, Frkanec L, Piantanida I, Smuc T, Tusek-Bozić L. Antitumor Potential of Crown Ethers: Structure−Activity Relationships, Cell Cycle Disturbances, and Cell Death Studies of a Series of Ionophores. J Med Chem 2007; 50:1007-18. [PMID: 17300184 DOI: 10.1021/jm061162u] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The present paper demonstrates the antiproliferative ability and structure-activity relationships (SAR) of 14 crown and aza-crown ether analogues on five tumor-cell types. The most active compounds were di-tert-butyldicyclohexano-18-crown-6 (3), which exhibited cytotoxicity in the submicromolar range, and di-tert-butyldibenzo-18-crown-6 (5) (IC50 values of approximately 2 microM). Also, 3 and 5 induced marked influence on the cell cycle phase distribution--strong G1 arrest, followed by the induction of apoptosis. A computational SAR modeling effort offers insight into possible mechanisms of crown ether biological activity, presumably involving penetration into cell membranes, and points out structural features of molecules important for this activity. The results reveal that crown ethers possess marked tumor-cell growth inhibitory activity, the extent of which depends on the characteristics of the hydrophilic macrocylic cavity and the surrounding hydrophobic ring. Our work supports the hypothesis that crown ether compounds inhibit tumor-cell growth by disrupting potassium ion homeostasis, which in turn leads to cell cycle perturbations and apoptosis.
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Affiliation(s)
- Marko Marjanović
- Laboratory of Functional Genomics, Rudjer Bosković Institute, Bijenicka cesta 54, P.O. Box 180, HR-10002 Zagreb, Croatia
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Miljanić S, Frkanec L, Biljan T, Meić Z, Zinić M. Surface-enhanced Raman scattering on molecular self-assembly in nanoparticle-hydrogel composite. Langmuir 2006; 22:9079-81. [PMID: 17042511 DOI: 10.1021/la061521o] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Surface-enhanced Raman scattering has been applied to study weak intermolecular interactions between small organic gelling molecules involved in the silver nanoparticle-hydrogel composite formation. Assembly and disassembly of the gelator molecules in close vicinity to embedded silver nanoparticles were followed by changes in Raman intensity of the amide II and carboxyl vibrational bands, whereas the strength of the bands related to benzene modes remained constant. This implied that the gelator molecules were strongly attached to the silver particles through the benzene units, while participating in gel structure organization by intermolecular hydrogen bonding between oxalyl amide and carboxyl groups.
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Affiliation(s)
- Snezana Miljanić
- Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
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Affiliation(s)
- Mladen Žinić
- a Laboratory of Stereochemistry and Natural Compounds , Rudjer Bošković Institute , 41000, Zagreb , P.O.B. 1016 , Croatia
- b Department of Chemistry , University of Miami , Coral Gables , Florida , 33124 , USA
| | - Leo Frkanec
- a Laboratory of Stereochemistry and Natural Compounds , Rudjer Bošković Institute , 41000, Zagreb , P.O.B. 1016 , Croatia
- b Department of Chemistry , University of Miami , Coral Gables , Florida , 33124 , USA
| | - Vinko Škarć
- a Laboratory of Stereochemistry and Natural Compounds , Rudjer Bošković Institute , 41000, Zagreb , P.O.B. 1016 , Croatia
- b Department of Chemistry , University of Miami , Coral Gables , Florida , 33124 , USA
| | - Jack Trafton
- a Laboratory of Stereochemistry and Natural Compounds , Rudjer Bošković Institute , 41000, Zagreb , P.O.B. 1016 , Croatia
- b Department of Chemistry , University of Miami , Coral Gables , Florida , 33124 , USA
| | - George W. Gokel
- a Laboratory of Stereochemistry and Natural Compounds , Rudjer Bošković Institute , 41000, Zagreb , P.O.B. 1016 , Croatia
- b Department of Chemistry , University of Miami , Coral Gables , Florida , 33124 , USA
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Miljanić S, Frkanec L, Meić Z, Žinić M. Gelation Ability of Novel Oxamide-Based Derivatives Bearing a Stilbene as a Photo-Responsive Unit. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500535] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Oxalyl amide derivatives bearing 4-dodecyloxy-stilbene as a cis-trans photoisomerizing unit were synthesized. The trans derivative acted as a versatile gelator of various organic solvents, whereas the corresponding cis derivative showed a poor gelation ability or none at all. In diluted solution (c = 2.0 x10(-5) mol dm(-3), ethanol), the cis isomer was photochemically converted into the trans isomer within 4 min. Depending on the radiation wavelength, the trans isomer was stable or liable to photodecomposition. When exposed to irradiation, a concentrated solution of the cis isomer (c = 2.0 x 10(-2) mol dm(-3), ethanol) turned into a gel. The FT-Raman, FT-IR, and 1H NMR spectra demonstrated that the gelation process occurred because of a rapid cis --> trans photoisomerization followed by a self-assembly of the trans molecules. Apart from the formation of hydrogen bonding between the oxalyl amide parts of the molecules, confirmed by FT-IR spectroscopy, it was assumed that the pi-pi stacking between the trans-stilbene units of the molecule and a lipophilic interaction between long alkyl chains were the interactions responsible for gelation.
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Affiliation(s)
- Snezana Miljanić
- Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb, Strossmayerov trg 14, 10000 Zagreb, Croatia.
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Frkanec R, Travas D, Krstanović M, Spoljar BH, Ljevaković D, Vranesić B, Frkanec L, Tomasić J. Entrapment of peptidoglycans and adamantyltripeptides into liposomes: an HPLC assay for determination of encapsulation efficiency. J Liposome Res 2004; 13:279-94. [PMID: 14670233 DOI: 10.1081/lpr-120026452] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The encapsulation of different immunomodulating peptides, the peptidoglycan monomer, its semisynthetic derivatives (Adamant-1-yl)-acetyl-peptidoglycan monomer and Boc-Tyr-peptidoglycan monomer, respectively, and of two diastereoisomers of adamantyltripeptides into the large negatively charged multilamellar liposomes was investigated. The reproducible quantitative method using HPLC was established for the determination of the entrapped compounds. It was shown that the tested compounds could be efficiently incorporated into liposomes using either the film or modified film method. The results confirmed that the peptidoglycans with lipophilic substituents and particularly the adamantyltripeptides were incorporated into liposomes with higher efficiency than the peptidoglycan monomer using either of the described methods. Liposome preparations were stable at 4 degrees C up to seven days as shown by minimal leaking of the entrapped material.
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Affiliation(s)
- Ruza Frkanec
- Research and Development, Institute of Immunology, Inc., Zagreb, Croatia.
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Makarević J, Jokić M, Frkanec L, Katalenić D, Zinić M. Gels with exceptional thermal stability formed by bis(amino acid) oxalamide gelators and solvents of low polarity. Chem Commun (Camb) 2002:2238-9. [PMID: 12397995 DOI: 10.1039/b206690d] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Some bis (amino acid) oxalamide gelators form common thermo-reversible gels with various organic solvents but also gels of exceptional thermal stability with some solvents of medium and low polarity; the latter gels can be heated up to 50 degrees C higher temperatures than the bp of the solvent without apparent gel-to-sol transition.
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Affiliation(s)
- Janja Makarević
- Laboratory of Supramolecular Chemistry, Rudjer Boskovic Institute, Bijenicka 54, Zagreb, Croatia
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Frkanec L, Jokić M, Makarević J, Wolsperger K, Zinić M. Bis(PheOH) maleic acid amide-fumaric acid amide photoizomerization induces microsphere-to-gel fiber morphological transition: the photoinduced gelation system. J Am Chem Soc 2002; 124:9716-7. [PMID: 12175224 DOI: 10.1021/ja027189u] [Citation(s) in RCA: 156] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The photoinduced gelation system based on 1 (non-gelling) to 2 (gelling) molecular photoisomerization in water results by microspheres (1) to gel fibers (2) transformation at the supramolecular level.
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Affiliation(s)
- Leo Frkanec
- Laboratory of Supramolecular and Nucleoside Chemistry and NMR Center, Department of Chemistry and Biochemistry, Rudjer Bosković Institute, 10000 Zagreb, Bijenićka 54, Croatia
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Abstract
Chiral calix[4]arene derivatives with four O-(N-acetyl-PhgOMe), (1), (Phg denotes R-phenylglycine), or O-(N-acetyl-LeuOMe) (2) strands have been synthesised. Both compounds exist in chloroform in stable cone conformations with a noncovalently organised cavity at the lower rim that is formed by circular interstrand amidic hydrogen bonds. Such organisation affects both the selectivity and extraction/transport properties of 1 and 2 toward metal cations. Calix[4]arene derivatives with one OCH2COPhgOMe strand (3), two OCH2COPhgOMe strands (5) and with 1,3-OMe-2,4-(O-CH2COPhgOMe) substituents (4) at the lower rim have also been prepared. For 3, a conformation stabilised by a circular hydrogen-bond arrangement is found in chloroform, while 4 exists as a time-averaged C2 conformation with two intramolecular NH ...OCH3 hydrogen bonds. Compound 5 has a unique hydrogen-bonding motif in solution and in the solid state with two three-centred NH-.. O and two OH...O hydrogen bonds at the lower rim. This motif keeps 5 in the flattened cone conformation in chloroform. The X-ray structure analysis of 1 revealed a molecular structure with C2 symmetry; this structure is organised in infinite chains by intra- and intermolecular H bonds. The solid-state and solution structures of the [1-Na]ClO4 complex are identical, C4 symmetric cone conformations.
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Affiliation(s)
- L Frkanec
- Laboratory for Supramolecular and Nucleoside Chemistry, Rudjer Boskovic Institute, Zagreb, Croatia
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Žinić M, Frkanec L, Škarić V, Trafton J, Gokel GW. The enantioselective transport of Z-amino acid (Z = benzyloxycarbonyl) and dipeptide K+carboxylates by dipeptide derived lariat ethers. ACTA ACUST UNITED AC 1990. [DOI: 10.1039/c39900001726] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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