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Thermodynamics of clayedrug complex dispersions: isothermal titration calorimetry and high-performance liquid chromatography

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Journal of Pharmaceutical Analysis 2020年第1期10卷 78-85页

作者： Ana-Maria Totea Juan Sabin Irina Dorin Karl Hemming Peter R.Laity Barbara R.Conway Laura Waters Kofi Asare-Addo School of Applied Sciences Department of PharmacyUniversity of HuddersfieldQueensgateHuddersfieldHD13DHUK AFFINImeter Edificio EmprendiaCampus VidaSantiago de CompostelaSpain Malvern Panalytical Ltd. MalvernUK School of Applied Sciences Department of ChemistryUniversity of HuddersfieldQueensgateHuddersfieldHD13DHUK Department of Materials Science and Engineering University of SheffieldSir Robert Hadfield BuildingMappin StreetSheffieldS13JDUK

An understanding of the thermodynamics of the complexation process utilized in sustaining drug release in clay matrices is of great *** characterisation techniques as well as isothermal calorimetry were utilized in investigating the adsorption process of a model cationic drug(diltiazem hydrochloride,DIL)onto a pharmaceutical clay system(magnesium aluminium silicate,MAS).X-ray powder diffraction(XRPD),attenuated total reflectance Fourier transform infrared spectroscopy(ATRFTIR)and optical microscopy confirmed the successful formation of the DIL-MAS *** quantification from the complexes demonstrated variable behaviour in the differing media used with DIL degrading to desacetyl diltiazem hydrochloride(DC-DIL)in the 2 M HCl *** also,the authors report for the first time two binding processes that occurred for DIL and MAS.A competitor binding model was thus proposed and the thermodynamics obtained suggested their binding processes to be enthalpy driven and entropically *** information is of great importance for a formulator as care and consideration should be given with appropriate media selection as well as the nature of binding in complexes.

关键词： Clay-drug complex dispersions Magnesium aluminium silicate Diltiazem hydrochloride isothermal titration calorimetry High performance liquid chromatography

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Interaction between Heparin and Fibronectin: Using Quartz Crystal Microbalance with Dissipation, Immunochemistry and isothermal titration calorimetry

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 1074-1084页

作者：李贵才 WANG Caiping 杨苹 ZHOU Jie ZHU Pingchuan Jiangsu Key Laboratory of Neuroregeneration Nantong University Key Laboratory for Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University Guangxi Key Laboratory for Subtropical Bio-Resource Conservation and Utilization Guangxi University

The adsorption behavior of heparin and fibronectin was studied by quartz crystal microbalance with dissipation(QCM-D), and the interaction between heparin and fibronectin was evaluated using immunochemistry and isothermal titration calorimetry(ITC) measurement. The results showed that there was competitive adsorption between heparin and fibronectin, and the preadsorption of fibronectin could prevent subsequent heparin adsorption to some extent, and the adsorbed Hep/Fn complex on the surface was in a rigid form. The bioactivity of heparin and fibronectin could be affected by the bulk concentration of each, and both heparin and fibronectin in Hep/Fn complex formed under p H 4 condition displayed larger bioactivity than that formed under p H 7 condition. Moreover, the fibronectin showed more exposed cell-binding sites at the p H value lower than physiological condition. The results of ITC further suggested that the interaction between heparin and fibronectin under p H 4 was stronger than under p H 7, and the complex was also more stable. The study brings forth the detailed interaction between heparin and fibronectin, which will be helpful for better understanding the interaction mechanism of the two biomolecules. The results may be potentially useful for the development of new generation of cardiovascular biomaterials.

关键词： Heparin fibronectin QCM-D immunochemistry isothermal titration calorimetry

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Characterization of β-lactamase activity and inhibition using isothermal titration calorimetry in living cells

Characterization of β-lactamase activity and inhibition usi...

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第十届全国化学生物学学术会议

作者： Ying Ge Wenming Wang Ke-Wu Yang Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education College of Chemistry and Materials ScienceNorthwest University

Hydrolysis of β-lactam antibiotic by β-lactamase is the most common mechanism ofβ-lactam resistance in clinical *** detection and characterization ofβ-lactamases are utmost biomedical *** spectrophotometric method is time-consuming and cannot provide thermodynamic information onβ-lactamases.A new assay was developed for the study of β-lactamase（Metallo-β-lactamase NDM-1） activity in living bacterial cells,based on heat-flow changes derived from enzymatic hydrolysis of β-lactams using isothermal titration *** thermokinetic parameters of cefazolin and the inhibition constant of EDTA were determined using the calorimetric *** results from the calorimetric assays were consistent with the data from the spectrophotometric *** ITC assay is a reliable and fast method to study β-lactamase enzyme kinetics and inhibition,which can also provide thermodynamic information on antibiotic hydrolysis.

关键词： β-lactamase isothermal titration calorimetry

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Thermodynamics analysis of the binding of Cd2+ and MoO42- in aqueous solution by isothermal titration calorimetry

Thermodynamics analysis of the binding of Cd2+ and MoO42- in...

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中国化学会第十五届全国化学热力学和热分析学术会议

作者： Li Yanfen,Jiang Junying,Ma Yujie,Fan Gaochao,Huang Zaiyin College of Chemistry & Ecological Engineering,Guangxi University for Nationalities, Nanning 530006,PR China,

This article aims to explore the possibility of using isothermal titration microcalorimetry(ITC) for the investigation on the binding of Cd and MoO and the effect of temperature on the binding *** this work,ITC was pr... 详细信息

关键词： Thermodynamics isothermal titration calorimetry CdMoO4 crystals

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In situ isothermal titration calorimetry investigation on the growth of In(OH)3 crystals in water

In situ isothermal titration calorimetry investigation on th...

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中国化学会第十五届全国化学热力学和热分析学术会议

作者： Li Yanfen,Jiang Junying,Fan Gaochao,Ma Yujie,Huang Zaiyin College of Chemistry & Ecological Engineering,Guangxi University for Nationalities, Nanning 530006,PR China,

The growth process of In(OH) crystals in the aqueous solution has been investigated by isothermal titration microcalorimetry(ITC).The binding constant(K),the molar enthalpy change (ΔH) and the binding stoichiometry(n... 详细信息

关键词： isothermal titration calorimetry In(OH)3 crystals Thermodynamics

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Exploring the taste presentation and receptor perception mechanism of salty peptides from Stropharia rugosoannulata based on molecular dynamics and thermodynamics simulation

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Food Science and Human Wellness 2024年第4期13卷 2277-2288页

作者： Wen Li Shuai Sun Wanchao Chen Haile Ma Tingzhao Li Zhong Zhang Di Wu Mengqiu Yan Yan Yang Institute of Edible Fungi Shanghai Academy of Agricultural SciencesNational Engineering Research Center of Edible FungiKey Laboratory of Edible Fungi Resources and Utilization(South)Ministry of Agriculture and Rural AffairsShanghai 201403China School of Food&Biological Engineering Institute of Food Physical ProcessingJiangsu UniversityZhenjiang 212013China Amway(Shanghai)Innovation&Science Co. Ltd.Shanghai 201203China Amway(China)Botanical R&D Center Wuxi 214115China

The taste presentation and receptor perception mechanism of the salty peptide of Stropharia rugosoannulata were predicted and verified using peptide omics and molecular interaction *** combination of aspartic acid(D)and glutamic acid(E),or peptide fragments composed of arginine(R),constitute the characteristic taste structural basis of salty peptides of *** taste intensity of the salty peptide positively correlates with its concentration within a specific concentration range(0.25–1.0 mg/mL).The receptor more easily recognizes the first amino acid residue at the N-terminal of salty peptides and the aspartic acid residue in the ***513,ASP707,and VAL508 are the critical amino acid residues for the receptor to recognize salty ***1 is specifically the receptor for recognizing salty *** bonds and electrostatic interactions are the main driving forces for the interactions between salty peptides and TRPV1 *** has the most potent binding capacity with the receptor and has tremendous potential for application in sodium salt *** study confirmed the taste receptor that specifically recognizes salty peptides,analyzed the receptor-peptide binding interaction,and provided a new idea for understanding the taste receptor perception of salty peptides.

关键词： Salty peptide Molecular docking Biolayer interferometry isothermal titration calorimetry

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Kinetics and enthalpy measurements of interaction between β-amyloid and liposomes by surface plasmon resonance and isothermal titration microcalorimetry

Kinetics and enthalpy measurements of interaction between β...

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中国化学会第十五届胶体与界面化学会议

作者： Ming-Shen Lin TA Instruments

The objective of this research is to understand the interaction mechanism ofβ-amyloid(Aβ)with cell and were basically divided into two *** first part focused on the time-dependent structural changes of Aβ(1-40)by circular dichroism(CD)spectroscopy,thioflavin T(Th T)fluorescence assay,and atomic force microscopy(AFM).The second part emphasized the kinetics and enthalpy of interaction between Aβ(1-40)and liposome by surface plasmon resonance(SPR)and isothermal titration microcalorimetry(ITC).Results obtained from CD,Th T and AFM confirmed the formation of 1 fibril after single day *** driving force of kinetic interaction between Aβand liposomes was revealed by SPR to be *** studies indicated that fresh Aβhas high GM1 ***,addition of cholesterol to the liposome could alter membrane fluidity and affect the interactions of fresh Aβwith liposomes especially in the amount of Aβabsorbed and preserving the structure of liposome after *** was found to be the driving force leading to the interaction between Aβfibrils and *** reactions are endothermic as supported by ITC *** the composition of liposomes is zwitterionic lipids,the interaction of Aβwith liposomes is predominantly hydrophobic *** contrast,the driving force of interaction of charged lipids with Aβis electrostatic.

关键词： β-amyloid(Aβ) Lipsome Surface plasmon resonance isothermal titration calorimetry Enthalpy

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Crystal structure of E. coli arginyl-tRNA synthetase and ligand binding studies revealed key residues in arginine recognition

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Protein & Cell 2014年第2期5卷 151-159页

作者： Kelei Bi Yueting Zheng Feng G"ao Jianshu Dong Jiangyun Wang Yi Wang Weimin Gong Laboratory of Non-coding RNA Institute of Biophysics Chinese Academy of Sciences

The arginyl-tRNA synthetase(ArgRS) catalyzes the esterification reaction between L-arginine and its cognate tRNAArg. Previously reported structures of ArgRS shed considerable light on the tRNA recognition mechanism, while the aspect of amino acid binding in ArgRS remains largely unexplored. Here we report the first crystal structure of E. coli ArgRS(eArgRS) complexed with L-arginine, and a series of mutational studies using isothermal titration calorimetry(ITC). Combined with previously reported work on ArgRS, our results elucidated the structural and functional roles of a series of important residues in the active site, which furthered our understanding of this unique enzyme.

关键词： arginyl-tRNA synthetase amino acyl-tRNA synthetase isothermal titration calorimetry site-directed mutation X-ray crystal structure E. coli

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Thermodynamic study on the interaction between anti-tumor drug tegafur and human serum albumin

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Chinese Chemical Letters 2007年第7期18卷 891-894页

作者： Lin Wei Li Dong Dong Wang De Zhi Sun Min Liu You Ying Di Hua Chao Yan College of Chemistry and Chemical Engineering Liaocheng University Liaocheng 252059 China

The changes of thermodynamic properties of the system on interaction between tegafur and human serum albumin （HSA） and the changes of secondary structure units of HSA in the system at 298.15 K have been investigated by the Nano-Watt-Scale isothermal titration calorimetry （ITC）, the Langmuirs binding model and the circular dichroism （CD） spectrometry.

关键词： Tegafur Human serum albumin isothermal titration calorimetry Circular dichroism

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Structural implications of Dpy30 oligomerization for MLL/SET1 COMPASS H3K4 trimethylation

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Protein & Cell 2015年第2期6卷 147-151页

作者： Hongmei Zhang Mei Li Yu Gao Chenjun Jia Xiaowei Pan Peng Cao Xuelin zhao Jiping Zhang Wenrui Chang Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Dear Editor, The methylation modifications of histone 3 lysine 4 （H3K4） have essential effects on biological processes including gene expression and transcription, cell cycle progression, and DNA repair. From yeast to mammals, the SET1 and MLL-like （mixed-lineage leukemia） multi-subunit protein complexes, known as SET1 or MLL COMPASS （Schneider et al., 2005）, are responsible for H3K4 methylation. In addition to the catalytic SET domain, the SET1 and MLL COMPASS complexes also contain a number of conserved subunits including WDR5 （Cps30）, RbBP5 （Cps50）.

关键词： isothermal titration calorimetry H3K4 Methylation Target Peptide H3K4 Trimethylation Hydrophobic Groove

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