Para-hydrogenated Glucose Derivatives as Potential 13C-Hyperpolarized Probes for Magnetic Resonance Imaging
摘要:
A set of molecules in which a glucose moiety is bound to a hydrogenable synthon has been synthesized and evaluated for hydrogenation reactions and for the corresponding para-hydrogen-induced polarization (PHIP) effects, in order to select suitable candidates for an in vivo magnetic resonance imaging (MRI) method for the assessment of glucose cellular uptake. It has been found that amidic derivatives do not yield any polarization enhancement, probably due to singlet-triplet state mixing along the reaction pathway. In contrast, ester derivatives are hydrogenated in high yield and afford enhanced H-1 and C-13 NMR spectra after para-hydrogenation. The obtained PHIP patterns are discussed and explained on the basis of the calculated spin level populations in the para-hydrogenated products. These molecules may find interesting applications in C-13 MRI as hyperpolarized probes for assessing the activity of glucose transporters in cells.
Investigating the Impact of Polymer Functional Groups on the Stability and Activity of Lysozyme–Polymer Conjugates
作者:Melissa Lucius、Rebecca Falatach、Cameron McGlone、Katherine Makaroff、Alex Danielson、Cameron Williams、Jay C. Nix、Dominik Konkolewicz、Richard C. Page、Jason A. Berberich
DOI:10.1021/acs.biomac.5b01743
日期:2016.3.14
Polymers are often conjugated to proteins to improve stability; however, the impact of polymer chain length and functional groups on protein structure and function is not well understood. Here we use RAFT polymerization to grow polymers of different lengths and functionality from a short acrylamide oligomer with a RAFT end group conjugated to lysozyme. We show by X-ray crystallography that enzyme structure is minimally impacted by modification with the RAFT end group. Significant activity toward the negatively charged Micrococcus lysodeicticus cell wall was maintained when lysozyme was modified with cationic polymers. Thermal and chemical stability of the conjugates was characterized using differential scanning fluorimetry and tryptophan fluorescence. All conjugates had a lower melting temperature; however, conjugates containing ionic or substrate mimicking polymers were more resistant to denaturation by guanidine hydrochloride. Our results demonstrate that tailoring polymer functionality can improve conjugate activity and minimize enzymatic inactivation by denaturants.
Novel glycopolymer hydrogels as mucosa-mimetic materials to reduce animal testing
作者:Michael T. Cook、Sarah L. Smith、Vitaliy V. Khutoryanskiy
DOI:10.1039/c5cc02428e
日期:——
Glycopolymer hydrogels capable of mimicking mucosal tissue in mucoadhesion testing have been designed.
我们设计了能够在粘液粘附测试中模拟粘膜组织的聚糖水凝胶。
JPH10298039A
申请人:——
公开号:JPH10298039A
公开(公告)日:1998-11-10
Para-hydrogenated Glucose Derivatives as Potential <sup>13</sup>C-Hyperpolarized Probes for Magnetic Resonance Imaging
作者:Francesca Reineri、Daniela Santelia、Alessandra Viale、Erika Cerutti、Luisa Poggi、Tomas Tichy、Samuel S. D. Premkumar、Roberto Gobetto、Silvio Aime
DOI:10.1021/ja101399q
日期:2010.5.26
A set of molecules in which a glucose moiety is bound to a hydrogenable synthon has been synthesized and evaluated for hydrogenation reactions and for the corresponding para-hydrogen-induced polarization (PHIP) effects, in order to select suitable candidates for an in vivo magnetic resonance imaging (MRI) method for the assessment of glucose cellular uptake. It has been found that amidic derivatives do not yield any polarization enhancement, probably due to singlet-triplet state mixing along the reaction pathway. In contrast, ester derivatives are hydrogenated in high yield and afford enhanced H-1 and C-13 NMR spectra after para-hydrogenation. The obtained PHIP patterns are discussed and explained on the basis of the calculated spin level populations in the para-hydrogenated products. These molecules may find interesting applications in C-13 MRI as hyperpolarized probes for assessing the activity of glucose transporters in cells.
Solid phase synthesis method and reagent
申请人:SurModics, Inc.
公开号:US06410643B1
公开(公告)日:2002-06-25
A reagent composition adapted to be coated onto a support surface in order to provide that surface with a high density of reactive groups. The surface, thus coated, can be used for any suitable purpose, and is particularly well suited for use as a solid phase synthesis support surface. The synthesis support surface, in turn, can be used in repetitive and combinatorial syntheses such as the synthesis of polynucleotides, polypeptides and polysaccharides. The polymeric coating can be used to provide increased effective surface area, particularly in situations in which the effective area of the support surface is itself limited, as on the surface of a silicon wafer. In so doing, the polymeric coating provides an optimal combination of such properties as reactive density and surface area or volume.