Browsing School of Chemistry by Author "Erxleben, Andrea"
Now showing items 1-20 of 39
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Antitumor platinum(IV) derivatives of carboplatin and the histone deacetylase inhibitor 4-phenylbutyric acid
Almotairy, Awatif Rashed Z.; Gandin, Valentina; Morrison, Liam; Marzano, Cristina; Montagner, Diego; Erxleben, Andrea (Elsevier, 2017-09-10)Five new platinum(IV) derivatives of carboplatin each incorporating the histone deacetylase inhibitor 4-phenylbutyrate in axial position were synthesized and characterized by 1H and 195Pt NMR spectroscopy, electrospray ... -
Application of ball milling for highly selective mechanochemical polymorph transformations
Kamali, Naghmeh; Gniado, Katarzyna; McArdle, Patrick; Erxleben, Andrea (American Chemical Society, 2018-06-07)Milling is an important secondary processing technique in the manufacture of pharmaceuticals, primarily used as a particle size reduction process. p-Aminobenzoic acid (PABA), m-aminobenzoic acid (MABA), o-aminobenzoic acid ... -
Application of vibrational spectroscopy to study solid-state transformations of pharmaceuticals
Erxleben, Andrea (2016-09-01)Understanding the properties, stability and transformations of the solid-state forms of an active pharmaceutical ingredient (API) in the development pipeline is of crucial importance for process-development, formulation ... -
Cocrystal forms of the BCS class IV drug sulfamethoxazole
Alsubaie, Moneerh; Aljohani, Marwah; Erxleben, Andrea; McArdle, Patrick (American Chemical Society, 2018-05-23)Sulfamethoxazole, smz, is an antibiotic that is classified as a Biopharmaceutics Classification System (BCS) class IV, low solubility and low permeability drug. Cocrystal formation has been examined in an attempt to improve ... -
A comprehensive cocrystal screening study of chlorothiazide
Aljohani, Marwah; Pallipurath, Anuradha R.; McArdle, Patrick; Erxleben, Andrea (American Chemical Society, 2017-09-01)Cocrystal formation of chlorothiazide (ctz) was screened with a variety of coformers with carboxyl, amide, hydroxyl, sulfonamide, pyridine, amidine, and amine functional groups. New cocrystals with acetamide (aca), benzamide ... -
A comprehensive spectroscopic study of the polymorphs of diflunisal and their phase transformations
Pallipurath, Anuradha R.; Civati, Francesco; Sibik, Juraj; Crowley, Clare; Zeitler, J. Axel; McArdle, Patrick; Erxleben, Andrea (Elsevier, 2017-06-08)Understanding phase transitions in pharmaceutical materials is of vital importance for drug manufacturing, processing and storage. In this paper we have carried out comprehensive high-resolution spectroscopic studies on ... -
Conversion of gel-forming crystal needles to easily processable more equant crystals Using high-shear ultralow attrition agitation: accelerated Ostwald ripening without crystal attrition
Civati, Francesco; Erxleben, Andrea; Kellehan, Seamus; McArdle, Patrick (American Chemical Society, 2019-02-01)We demonstrate the first examples of the transformation of gel-forming crystal needles into easily processable more equant crystals by accelerated Ostwald ripening without detectable crystal attrition. Using high solution ... -
Crystalline adducts of the Lawsone molecule (2-hydroxy-1,4-naphthaquinone): optical properties and computational modelling
Pallipurath, Anuradha; Skelton, Jonathan M.; Delori, Amit; Duffy, Connor; Erxleben, Andrea; Jones, William (Royal Society of Chemistry, 2015-09-04)Four new crystalline adducts of the Lawsone molecule (2-hydroxy-1,4-naphthaquinone) with 4,4'-bipyridine, 4-(2-pyridine-4-ethyl)pyridine, 1,3-di.4-pyridyl)propane and 2-hydroxy pyridine are reported. Adduct formation leads ... -
Crystallization of organic salts from the gas phase: When does proton transfer take place?
O’Malley, Ciarán; Erxleben, Andrea; McArdle, Patrick; Simmie, John M. (American Chemical Society, 2020-12-13)Salt formation with proton transfer is observed in crystals grown by cosublimation of the salt coformers. Diflunisal salts were obtained with 4-[3-(pyridin-4-yl)propyl]pyridine, piperazine, and 4-dimethylaminopyridine. ... -
A Cu(II) complex targeting the translocator protein: in vitro and in vivo antitumor potential and mechanistic insights
Montagner, D.; Fresch, B.; Browne, K.; Gandin, V.; Erxleben, Andrea (Royal Society of Chemistry, 2016-12-01)A new Cu-based anticancer metallodrug which targets the translocator protein is reported. [CuBr2(TZ6)] elicits a remarkable in vitro cytotoxicity in sensitive and multidrug resistant cell lines and induces a 98% reduction ... -
Cytotoxicity and antimicrobial activity of triorganotin(IV) complexes of phenylcyanamide prepared by sonochemical synthesis
Tabrizi, Leila; McArdle, Patrick; Erxleben, Andrea; Chiniforoshan, Hossein (Elsevier, 2015-09-25)This article describes the synthesis and characterization of novel triorganotin(IV) complexes and their potential medicinal applications. Triorganotin(IV) complexes with formulas [(SnMe3)(2)(mu-bp)(H2O)(2)], 1, and ... -
Cytotoxicity and ROS production of novel Pt(IV) oxaliplatin derivatives with indole propionic acid
Tolan, Dina; Almotairy, Awatif Rashed Z.; Howe, Orla; Devereux, Michael; Montagner, Diego; Erxleben, Andrea (Elsevier, 2019-04-19)The coordination of biologically active moieties to the axial positions of Pt(IV) derivatives of Pt(II) anticancer drugs allows the co-delivery and simultaneous activation of two pro-drugs for combination therapy. Pt(IV) ... -
DNA binding, cleavage and cytotoxicity of a novel dimetallic Fe(III) triaza-cyclononane complex
Araujo, Thaylan Pinheiro; Gandin, Valentina; Kavanagh, Paul; Braude, Jeremy Phillip; Nodari, Luca; Montagner, Diego; Erxleben, Andrea (Elsevier, 2016-03-03)A novel bimetallic Fe(III) complex with the bis(triaza-cyclononane) ligand 2,6-bis(1,4,7-triazacyclonon-1-ylmethyl)-4-methylphenol (bcmp) is reported. [Fe-2(bcmp(-H))(mu-OH)Cl-2]Cl-2 (2) contains two octahedral Fe(III) ... -
DNA damage and induction of apoptosis in pancreatic cancer cells by a new dinuclear bis(triazacyclonane) copper complex
Montagner, Diego; Gandin, Valentina; Marzano, Cristina; Erxleben, Andrea (Elsevier, 2015-01-26)The dinuclear copper(II) complex [Cu-2{bcmp(-H)}(mu-OH)](NO3)(2)center dot H2O (1, bcmp = 2,6-bis(1,4,7-triazacyclonon-1-ylmethyl)-4-methylphenol) has been synthesized and characterized by electrospray ionization mass ... -
Dual-drug amorphous formulation of gliclazide
Aljohani, Marwah; McArdle, Patrick; Erxleben, Andrea (Taylor and Francis, 2021-02-01)Amorphization is a well-established strategy to enhance the dissolution properties of poorly water-soluble drugs. However, the amorphous state is inherently unstable toward recrystallization. Coamorphous systems of a drug ... -
Effects of ball-milling and cryomilling on sulfamerazine polymorphs: A quantitative study
MacFhionnghaile, Pól; Hu, Yun; Gniado, Katarzyna; Curran, Sinead; McArdle, Patrick; Erxleben, Andrea (Elsevier, 2014-04-11)The effects of ball-milling and cryomilling on sulfamerazine forms I and II (SMZ FI, FII) were investigated using X-ray powder diffraction, infrared and near-infrared (NIR) spectroscopy. Cryomilling resulted in a complete ... -
Formation, physical stability, and quantification of process-induced disorder in cryomilled samples of a model polymorphic drug
Hu, Yun; MacFhionnghaile, Pól; Caron, Vincent; Tajber, Lidia; Healy, Anne Marie; Erxleben, Andrea; McArdle, Patrick (Elsevier, 2012-10-09)The formation and physical stability of amorphous sulfathiazole obtained from polymorphic forms I and III by cryomilling was investigated by X-ray powder diffraction (XRPD) and near-infrared (NIR) spectroscopy. Principal ... -
Ga-III Complexes as Models for the M-III Site of Purple Acid Phosphatase: Ligand Effects on the Hydrolytic Reactivity Toward Bis(2,4-dinitrophenyl) phosphate
Erxleben, Andrea; Coleman, Fergal; Hynes, Michael (2010)The effects of a series of Galli complexes with tripodal ligands on the hydrolysis rate of the activated phosphate diester bis(2,4-dinitrophenyl)phosphate (BDNPP) have been investigated. In particular, the influence of the ... -
Hydrogen bonding networks and solid-state conversions in benzamidinium salts
Kamali, Naghmeh; Aljohani, Marwah; McArdle, Patrick; Erxleben, Andrea (2015-07-14)Ten benzamidinium salts of carboxylic acids, amides, and sulfonamides have been crystallized from solution. Single-crystal X-ray analyses revealed various hydrogen bonding motifs which ate discussed in terms of supramolecular ... -
The influence of co-formers on the dissolution rates of co-amorphous sulfamerazine/excipient systems
Gniado, Katarzyna; Löbmann, Korbinian; Rades, Thomas; Erxleben, Andrea (Elsevier, 2016-03-16)A comprehensive study on the dissolution properties of three co-amorphous sulfamerazine/excipient systems, namely sulfamerazine/deoxycholic acid, sulfamerazine/citric acid and sulfamerazine/sodium taurocholate (SMZ/DA, ...