1
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Antalicz B, Sengupta S, Vilangottunjalil A, Versluis J, Bakker HJ. Orientational Behavior and Vibrational Response of Glycine at Aqueous Interfaces. J Phys Chem Lett 2024; 15:2075-2081. [PMID: 38358315 PMCID: PMC10895693 DOI: 10.1021/acs.jpclett.3c02930] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Aqueous glycine plays many different roles in living systems, from being a building block for proteins to being a neurotransmitter. To better understand its fundamental behavior, we study glycine's orientational behavior near model aqueous interfaces, in the absence and presence of electric fields and biorelevant ions. To this purpose, we use a surface-specific technique called heterodyne-detected vibrational sum-frequency generation spectroscopy (HD-VSFG). Using HD-VSFG, we directly probe the symmetric and antisymmetric stretching vibrations of the carboxylate group of zwitterionic glycine. From their relative amplitudes, we infer the zwitterion's orientation near surfactant-covered interfaces and find that it is governed by both electrostatic and surfactant-specific interactions. By introducing additional ions, we observe that the net orientation is altered by the enhanced ionic strength, indicating a change in the balance of the electrostatic and surfactant-specific interactions.
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Affiliation(s)
- Balázs Antalicz
- Ultrafast Spectroscopy, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Sanghamitra Sengupta
- Ultrafast Spectroscopy, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | | | - Jan Versluis
- Ultrafast Spectroscopy, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Huib J Bakker
- Ultrafast Spectroscopy, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
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2
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Li YY, Li RZ, Wang XY. Interaction of glycine with Li + in the (H 2O) n (n = 0-8) clusters. J Mol Model 2023; 29:254. [PMID: 37464061 DOI: 10.1007/s00894-023-05663-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 07/12/2023] [Indexed: 07/20/2023]
Abstract
CONTEXT We investigated the interaction between glycine and Li+ in water environment based on the Gly·Li+(H2O)n (n = 0-8) cluster. Our study shows that for Gly·Li+, Li+ binds to both carbonyl oxygen and amino nitrogen to form a bidentate structure, and the first three water molecules preferentially interact with Li+. For n = 0-5, the complexes of Gly·Li+(H2O)n exist in neutral form, and when the water number reached 6, the complex can coexist in neutral and zwitterionic form, then zwitterionic structures are dominant for n = 7, 8. The analyses by RDG, AIM, and ESP in conjunction with the calculated interaction energies show that the interaction between Li+ and Gly decreases gradually with the water molecules involved successively from n = 1 to 6 and then increases for n = 7-8. Additionally, the infrared spectra of Gly·Li+(H2O)n (n = 0-8) are also calculated. METHODS The initial structures were optimized using Gaussian 09 program package in B3LYP-D3 (BJ)/6-311G(d, p) method, and the frequency was calculated with 6-311 + G(2d, p) basis set. GaussView5.0.9 was used to view simulation infrared spectra. The noncovalent interaction method (NCl), energy decomposition (EDA), atoms in molecules (AIM) analysis, and electrostatic potential (ESP) analyses were conducted using Multiwfn software to gain a deeper understanding of the interaction properties of Gly, Li+, and water.
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Affiliation(s)
- Yuan-Yi Li
- School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, People's Republic of China
| | - Ren-Zhong Li
- School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, People's Republic of China.
| | - Xin-Yu Wang
- School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, People's Republic of China
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3
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Wu S, Fang L, Li Y, Wang HB, Zhang H. A Fluorescence Turn On-off-on Method for Sensitive Detection of Sn 2+ and Glycine Using Waste Eggshell Membrane Derived Carbon Nanodots as Probe. J Fluoresc 2023; 33:1505-1513. [PMID: 36763295 DOI: 10.1007/s10895-022-03133-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 12/19/2022] [Indexed: 02/11/2023]
Abstract
Changes in Sn2+ and glycine levels are relevant to many important physiological procedures in human health. However, investigation of their physiological functions is limited because few versatile methods towards Sn2+ and glycine detection have been developed. In this work, a fluorescence turn on-off-on strategy was firstly constructed for rapid and sensitive detection of Sn2+ and glycine through the specific binding between Sn2+ and glycine. Carbon nanodots (CDs) with a quantum yield of 19.5% were synthesized by utilizing inner film of waste eggshell as carbon source and employed as fluorescent probe. In the presence of Sn2+, the fluorescence of CDs was quenched by Sn2+ via the primary inner filter effect (IFE). However, the binding between Sn2+ and glycine prevented the IFE between Sn2+ and CDs, resulting in fluorescence recovery of CDs. Under optimized conditions, the fluorescent response of CDs displayed good linear relationships with the concentrations of Sn2+ in the range of 10-200 µM and 200-5000 µM, and the limit of detection (LOD) was 2.4 µM. For glycine detection, a good linear relationship was obtained in the concentration range of 5-1000 µM with a low LOD down to 0.76 µM. Moreover, the practicability of the assay was also demonstrated by measuring glycine content in human serum samples. This work provides an economical, green and fast method for biological analysis of Sn2+ and glycine.
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Affiliation(s)
- Sifei Wu
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Institute for Conservation and Utilization of Agro-Bioresources in Dabie Mountains, Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Linxia Fang
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Institute for Conservation and Utilization of Agro-Bioresources in Dabie Mountains, Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, People's Republic of China.
| | - Yihan Li
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Institute for Conservation and Utilization of Agro-Bioresources in Dabie Mountains, Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Hai-Bo Wang
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Institute for Conservation and Utilization of Agro-Bioresources in Dabie Mountains, Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Hongding Zhang
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Institute for Conservation and Utilization of Agro-Bioresources in Dabie Mountains, Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, People's Republic of China.
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, People's Republic of China.
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4
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Lei C, Wang H, Zeng Y, Shi B. A cleaner leather chemical from feather waste for reducing ammonia-nitrogen pollution and improving biological treatment efficiency of tannery wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 342:118311. [PMID: 37276620 DOI: 10.1016/j.jenvman.2023.118311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 05/17/2023] [Accepted: 05/30/2023] [Indexed: 06/07/2023]
Abstract
Feather waste is produced in millions of tons globally every year, resulting in a waste of biomass resources and even environmental pollution. A sustainable strategy for utilizing feather waste was proposed by preparing a clean deliming agent for ammonia-nitrogen (NH3-N) reduction in leather manufacture and biological treatment efficiency improvement of tannery wastewater. Briefly, chicken feather wastes were deeply hydrolyzed with sulfuric acid, and the optimized keratin hydrolysate (KHopt) that contained 53.6% crude protein and 41.2% amino acids, such as glutamic acid, serine, proline, leucine, phenylalanine, glycine, valine, and arginine, was obtained and used to delime limed cattle hides. The appropriate ratio of amino acids in KHopt gave KHopt a great pH-buffering capacity and maintained a stable float pH of approximately 9 throughout the deliming process. The isoelectric points of KHopt (3.8) and the limed hide (6.3) were both lower than the float pH, thereby bringing about an electrostatic repulsion between the KHopt and the hide surface, which is helpful for KHopt to penetrate and deswell the limed hide rapidly. Moreover, the KHopt deliming effectively removed calcium from the limed hide and achieved leather comparable to conventional leather for commercial applications. KHopt reduced the NH3-N concentrations of deliming effluent and tannery wastewater by 91.1% and 80.6%, respectively, compared with the conventional deliming agent (ammonium sulfate), and dramatically increased the biological treatment efficiency of tannery wastewater. The results showed that efficient and high-value use of feather waste was made by preparing KHopt for sustainable leather manufacturing.
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Affiliation(s)
- Chao Lei
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, 610065, China
| | - Hao Wang
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Yunhang Zeng
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, 610065, China; College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China.
| | - Bi Shi
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, 610065, China; College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
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5
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Yang Y, Liu J, Zhu M, Dou S, Ding L. Adsorption of glycine at the anatase TiO 2/water interface: Effects of Ca 2+ ions. J Environ Sci (China) 2023; 128:26-34. [PMID: 36801039 DOI: 10.1016/j.jes.2022.08.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 08/05/2022] [Accepted: 08/10/2022] [Indexed: 06/18/2023]
Abstract
Adsorption reactions of amino acids (AAs) on TiO2 nanoparticles (NPs) play an important role in the available nutrients in soils and sediments. The pH effects on glycine adsorption have been studied, but little is known about its coadsorption with Ca2+ at the molecular level. Combined attenuated total reflectance Fourier transform infrared (ATR-FTIR) flow-cell measurements and density functional theory (DFT) calculations were used to determine the surface complex and corresponding dynamic adsorption/desorption processes. The structures of glycine adsorbed onto TiO2 were closely associated with its dissolved species in the solution phase. The presence of Ca2+ exerted different influences on glycine adsorption within pH 4-11, thus affecting its migration rate in soils and sediments. The mononuclear bidentate complex at pH 4-7, involving the COO- moiety of zwitterionic glycine, remained unchanged in the absence and presence of Ca2+. At pH 11, the mononuclear bidentate complex with deprotonated NH2 can be removed from the TiO2 surface upon coadsorption with Ca2+. The bonding strength of glycine on TiO2 was much weaker than that of the Ca-bridged ternary surface complexation. Glycine adsorption was inhibited at pH 4 but was enhanced at pH 7 and 11.
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Affiliation(s)
- Yanli Yang
- School of Public Health, Cheeloo College of Medicine, Shandong University, China.
| | - Jiaqi Liu
- School of Public Health, Cheeloo College of Medicine, Shandong University, China
| | - Mengyao Zhu
- School of Public Health, Cheeloo College of Medicine, Shandong University, China
| | - Shengping Dou
- School of Public Health, Cheeloo College of Medicine, Shandong University, China
| | - Lei Ding
- Environment Research Institute, Shandong University, Qingdao 266237, China
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6
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Göncüoğlu Taş N, Kocadağlı T, Balagiannis DP, Gökmen V, Parker JK. Effect of salts on the formation of acrylamide, 5-hydroxymethylfurfural and flavour compounds in a crust-like glucose/wheat flour dough system during heating. Food Chem 2023; 410:135358. [PMID: 36608554 DOI: 10.1016/j.foodchem.2022.135358] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 12/10/2022] [Accepted: 12/28/2022] [Indexed: 12/31/2022]
Abstract
Among many strategies known to mitigate acrylamide formation, addition of cations, particularly calcium, is effective and can be used in bakery products. In this study, the effects of NaCl, KCl, CaCl2, MgCl2, sodium lactate, calcium lactate, and magnesium lactate on aroma and acrylamide formation were investigated in glucose/wheat flour dough systems during heating. Addition of salts inhibited Maillard reaction in favour of caramelisation, with divalent cations found to be most effective. The impact of salts on acrylamide reduction became less effective with increasing temperature. Most Strecker aldehydes and pyrazines decreased in the presence of salts, however CaCl2 and calcium lactate increased the concentration of furans, furfurals, and diketones. Calcium lactate also increased some ethyl-substituted pyrazines at high temperatures. Reduction of acrylamide with salts is associated with higher amounts of furan derivatives and decreased amounts of Strecker aldehydes and pyrazines. The mechanisms behind these changes are discussed.
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Affiliation(s)
- Neslihan Göncüoğlu Taş
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Tolgahan Kocadağlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Dimitrios P Balagiannis
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, Reading RG6 6DZ, United Kingdom
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Jane K Parker
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, Reading RG6 6DZ, United Kingdom.
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7
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Yang F, Yuwono JA, Hao J, Long J, Yuan L, Wang Y, Liu S, Fan Y, Zhao S, Davey K, Guo Z. Understanding H 2 Evolution Electrochemistry to Minimize Solvated Water Impact on Zinc-Anode Performance. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2206754. [PMID: 36124561 DOI: 10.1002/adma.202206754] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/02/2022] [Indexed: 06/15/2023]
Abstract
H2 evolution is the reason for poor reversibility and limited cycle stability with Zn-metal anodes, and impedes practical application in aqueous zinc-ion batteries (AZIBs). Here, using a combined gas chromatography experiment and computation, it is demonstrated that H2 evolution primarily originates from solvated water, rather than free water without interaction with Zn2+ . Using linear sweep voltammetry (LSV) in salt electrolytes, H2 evolution is evidenced to occur at a more negative potential than zinc reduction because of the high overpotential against H2 evolution on Zn metal. The hypothesis is tested and, using a glycine additive to reduce solvated water, it is confirmed that H2 evolution and "parasitic" side reactions are suppressed on the Zn anode. This electrolyte additive is evidenced to suppress H2 evolution, reduce corrosion, and give a uniform Zn deposition in Zn|Zn and Zn|Cu cells. It is demonstrated that Zn|PANI (highly conductive polyaniline) full cells exhibit boosted electrochemical performance in 1 M ZnSO4 -3 M glycine electrolyte. It is concluded that this new understanding of electrochemistry of H2 evolution can be used for design of relatively low-cost and safe AZIBs for practical large-scale energy storage.
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Affiliation(s)
- Fuhua Yang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
- Institute for Superconducting and Electronic Materials, School of Mechanical, Materials, Mechatronics and Biomedical Engineering, University of Wollongong, North Wollongong, NSW 2522, Australia
| | - Jodie A Yuwono
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
- College of Engineering and Computer Science, Australian National University, Canberra, ACT, 2601, Australia
| | - Junnan Hao
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Jun Long
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Libei Yuan
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
- Institute for Superconducting and Electronic Materials, School of Mechanical, Materials, Mechatronics and Biomedical Engineering, University of Wollongong, North Wollongong, NSW 2522, Australia
| | - Yanyan Wang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Sailin Liu
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Yameng Fan
- Institute for Superconducting and Electronic Materials, School of Mechanical, Materials, Mechatronics and Biomedical Engineering, University of Wollongong, North Wollongong, NSW 2522, Australia
| | - Shiyong Zhao
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Kenneth Davey
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Zaiping Guo
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
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8
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Dimitrijević SP, Dimitrijević SB, Ivanović A, Vuković N, Dhawan N. Electrochemical stability of gold complex based on mercaptotriazole at optimal condition. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02447-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Attia RM. Extraction of uranium and copper from acid leached solid waste of Alluoga sedimentary rocks, Southwestern Sinai, Egypt. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08467-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AbstractA solid waste sample from acidic leaching of Alluoga sedimentary rocks, SW Sinai, Egypt, was processed for leaching and extraction of U and Cu respectively. This sample assayed 200 mg/kg U and 5 g/kg Cu. The present work aims to obtain solid waste free of U and Cu through selective alkaline leaching for uranium followed by environmentally safe glycine solution for copper leaching from the resulted waste. Under studied optimum conditions the leaching efficiency of U and Cu attained 93% and 96% respectively. Uranium was extracted using Amberlite IRA-400 Anion exchanger while Cu was selective extracted by LIX-973N diluted in kerosene. The relevant factors affecting the Cu extraction process were adequately studied and the number of stages for extraction and stripping were determined by the construction of McCabe–Thiele diagram.
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10
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Lu L, Li RZ, Xu XY. Interaction of Cysteine with Li + and LiF in the Presence of (H 2O) n ( n = 0-6) Clusters. ACS OMEGA 2022; 7:18646-18659. [PMID: 35694486 PMCID: PMC9178773 DOI: 10.1021/acsomega.2c01315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
The interaction between cysteine with Li+ and LiF in the microcosmic water environment was investigated to elucidate how ions interact with amino acids and the cation-anion correlation effect involved. The structures of Cys·Li+(H2O) n and Cys·LiF(H2O) n (n = 0-6) were characterized using ab initio calculations. Our studies show that the water preferentially interacts with Li+/LiF. In Cys·Li+(H2O)0-6, Li+ interacts with amino nitrogen, carbonyl oxygen, and hydrophobic sulfur of Cys to form a tridentate mode, whereas in Cys·LiF(H2O) n , Li+ and F- work in cooperation and interact with carbonyl oxygen and hydroxyl hydrogen of Cys to form a bidentate type. The neutral and zwitterionic forms are essentially isoenergetic when the water number reaches three in the presence of Li+, whereas this occurs at four water molecules in the presence of LiF. Further research revealed that the interaction between Li+/LiF and Cys was mainly electrostatic, followed by dispersion, and the weakest interaction occurs at the transition from the neutral form to zwitterionic form. Natural population analysis charge analyses show that for Cys·Li+(H2O) n , the positive charge is mostly concentrated on Li+ except for the system containing three water molecules. For Cys·LiF(H2O) n , the positive charge is centered on the LiF unit in the range n = 0-6, and at n = 5, electron transfer from Cys to water occurs. Our study shows that the contribution of anions in zwitterionic state stabilization should be addressed more generally along with cations.
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11
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Yang X, Jiang C, Zhang X, Liu F, Tong H, Hu Y, Ma H, Gao F, Wang Z. Theoretical Investigation of the Chiral Transition of α‐Alanine Cu
2+
Complex in Water Solution. ChemistrySelect 2021. [DOI: 10.1002/slct.202102027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaocui Yang
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Chunxu Jiang
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Xuejiao Zhang
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Fang Liu
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Hua Tong
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Yuming Hu
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Hongyuan Ma
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Feng Gao
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
| | - Zuocheng Wang
- Theoretical Computing Center Baicheng Normal University Baicheng 137000 People's Republic of China
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12
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A suitable modified Palladium Immobilized on Imidazolium supported Ionic liquid Catalysed Transfer Hydrogenation of Nitroarenes. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121935] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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13
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Infiltrated thin film structure with hydrogel-mediated precursor ink for durable SOFCs. Sci Rep 2021; 11:7109. [PMID: 33782467 PMCID: PMC8007576 DOI: 10.1038/s41598-021-86572-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 03/15/2021] [Indexed: 01/01/2023] Open
Abstract
The hydrogel of biomolecule-assisted metal/organic complex has the superior ability to form a uniform, continuous, and densely integrated structure, which is necessary for fine thin film fabrication. As a representative of nature-originated polymers with abundant reactive side chains, we select the gelatin molecule as an element for weaving the metal cations. Here, we demonstrate the interaction between the metal cation and gelatin molecules, and associate it with coating quality. We investigate the rheological property of gelatin solutions interacting with metal cation from the view of cross-linking and denaturing of gelatin molecules. Also, we quantitatively compare the corresponding interactions by monitoring the absorbance spectrum of the cation. The coated porous structure is systematically investigated from the infiltration of gelatin-mediated Gd0.2Ce0.8O2-δ (GDC) precursor into Sm0.5Sr0.5CoO3-δ (SSC) porous scaffold. By applying the actively interacting gelatin-GDC system, we achieve a thin film of GDC on SSC with excellent uniformity. Compare to the discrete coating from the typical infiltration process, the optimized thin film coated structure shows enhanced performance and stability.
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14
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Khan Z, Bashir O, AL-Thabaiti SA, Rafiquee M. Synthesis of ternary nanoparticles using the complexation-reduction method and their catalytic activities for hydrogen generation from formic acid. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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15
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Kostko O, Xu B, Ahmed M. Local electronic structure of histidine in aqueous solution. Phys Chem Chem Phys 2021; 23:8847-8853. [DOI: 10.1039/d1cp00361e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
X-Ray spectroscopy coupled with DFT calculations reveals the pH dependent electronic structure of an amino acid in an aqueous environment.
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Affiliation(s)
- O. Kostko
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
- Advanced Light Source
| | - B. Xu
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - M. Ahmed
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
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16
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Weber F, Sagstuen E, Zhong QZ, Zheng T, Tiainen H. Tannic Acid Radicals in the Presence of Alkali Metal Salts and Their Impact on the Formation of Silicate-Phenolic Networks. ACS APPLIED MATERIALS & INTERFACES 2020; 12:52457-52466. [PMID: 33180456 PMCID: PMC7735676 DOI: 10.1021/acsami.0c16946] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 11/09/2020] [Indexed: 06/11/2023]
Abstract
Polyphenolic molecules have become attractive building blocks for bioinspired materials due to their adhesive characteristics, capacity to complex ions, redox chemistry, and biocompatibility. For the formation of tannic acid (TA) surface modifications based on silicate-phenolic networks, a high ionic strength is required. In this study, we investigated the effects of NaCl, KCl, and LiCl on the formation of TA coatings and compared it to the coating formation of pyrogallol (PG) using a quartz-crystal microbalance. We found that the substitution of NaCl with KCl inhibited the TA coating formation through the high affinity of K+ to phenolic groups resulting in complexation of TA. Assessment of the radical formation of TA by electron paramagnetic resonance spectroscopy showed that LiCl resulted in hydrolysis of TA forming gallic acid radicals. Further, we found evidence for interactions of LiCl with the Siaq crosslinker. In contrast, the coating formation of PG was only little affected by the substitution of NaCl with LiCl or KCl. Our results demonstrate the interaction potential between alkali metal salts and phenolic compounds and highlight their importance in the continuous deposition of silicate-phenolic networks. These findings can be taken as guidance for future biomedical applications of silicate-phenolic networks involving monovalent ions.
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Affiliation(s)
- Florian Weber
- Department
of Biomaterials, Institute of Clinical Dentistry, University of Oslo, Oslo 0317, Norway
| | - Einar Sagstuen
- Department
of Physics, University of Oslo, Oslo 0317, Norway
| | - Qi-Zhi Zhong
- Centre
of Excellence in Convergent Bio-Nano Science and Technology, Department
of Chemical Engineering, The University
of Melbourne, Melbourne 3010, Australia
| | - Tian Zheng
- Materials
Characterisation and Fabrication Platform, Department of Chemical
Engineering, The University of Melbourne, Melbourne 3010, Australia
| | - Hanna Tiainen
- Department
of Biomaterials, Institute of Clinical Dentistry, University of Oslo, Oslo 0317, Norway
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17
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Kaur N, Young VG, Su Y, Suryanarayanan R. Partial Dehydration of Levothyroxine Sodium Pentahydrate in a Drug Product Environment: Structural Insights into Stability. Mol Pharm 2020; 17:3915-3929. [DOI: 10.1021/acs.molpharmaceut.0c00661] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Navpreet Kaur
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota—Twin Cities, 9-177 WDH, 308 Harvard Street Southeast, Minneapolis, Minnesota 55455, United States
| | - Victor G. Young
- Department of Chemistry, X-Ray Crystallographic Laboratory, LeClaire-Dow Chemical Instrumentation Facility, University of Minnesota—Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Yongchao Su
- Pharmaceutical Sciences, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Raj Suryanarayanan
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota—Twin Cities, 9-177 WDH, 308 Harvard Street Southeast, Minneapolis, Minnesota 55455, United States
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18
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El‐Husseiny AF, Hassan HH, Fadhil FM, Khalil TE. Nanometer‐sized, rod‐like, ligand‐containing tryptophan complexes: Anion influence–structural geometry–antitumor activity correlations. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Amel F. El‐Husseiny
- Chemistry Department, Faculty of Science Alexandria University PO Box 421 Ibrahimia Alexandria 21321 Egypt
| | - Hammed H.A.M. Hassan
- Chemistry Department, Faculty of Science Alexandria University PO Box 421 Ibrahimia Alexandria 21321 Egypt
| | - Firas M. Fadhil
- Chemistry Department, Faculty of Science Alexandria University PO Box 421 Ibrahimia Alexandria 21321 Egypt
| | - Tarek E. Khalil
- Chemistry Department, Faculty of Science Alexandria University PO Box 421 Ibrahimia Alexandria 21321 Egypt
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19
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Kooser K, Kivimäki A, Turunen P, Pärna R, Reisberg L, Kirm M, Valden M, Huttula M, Kukk E. Gas-phase endstation of electron, ion and coincidence spectroscopies for diluted samples at the FinEstBeAMS beamline of the MAX IV 1.5 GeV storage ring. JOURNAL OF SYNCHROTRON RADIATION 2020; 27:1080-1091. [PMID: 33566019 PMCID: PMC7336174 DOI: 10.1107/s1600577520007146] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 05/27/2020] [Indexed: 05/26/2023]
Abstract
Since spring 2019 an experimental setup consisting of an electron spectrometer and an ion time-of-flight mass spectrometer for diluted samples has been available for users at the FinEstBeAMS beamline of the MAX IV Laboratory in Lund, Sweden. The setup enables users to study the interaction of atoms, molecules, (molecular) microclusters and nanoparticles with short-wavelength (vacuum ultraviolet and X-ray) synchrotron radiation and to follow the electron and nuclear dynamics induced by this interaction. Test measurements of N2 and thiophene (C4H4S) molecules have demonstrated that the setup can be used for many-particle coincidence spectroscopy. The measurements of the Ar 3p photoelectron spectra by linear horizontal and vertical polarization show that angle-resolved experiments can also be performed. The possibility to compare the electron spectroscopic results of diluted samples with solid targets in the case of Co2O3 and Fe2O3 at the Co and Fe L2,3-absorption edges in the same experimental session is also demonstrated. Because the photon energy range of the FinEstBeAMS beamline extends from 4.4 eV up to 1000 eV, electron, ion and coincidence spectroscopy studies can be executed in a very broad photon energy range.
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Affiliation(s)
- Kuno Kooser
- Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland
- Institute of Physics, University of Tartu, W. Ostwaldi 1, EE-50411 Tartu, Estonia
| | - Antti Kivimäki
- Nano and Molecular Systems Research Unit, University of Oulu, PO Box 3000, FIN-90014 Oulu, Finland
- MAX IV Laboratory, Lund University, PO Box 118, SE-22100 Lund, Sweden
| | - Paavo Turunen
- Nano and Molecular Systems Research Unit, University of Oulu, PO Box 3000, FIN-90014 Oulu, Finland
| | - Rainer Pärna
- Institute of Physics, University of Tartu, W. Ostwaldi 1, EE-50411 Tartu, Estonia
- MAX IV Laboratory, Lund University, PO Box 118, SE-22100 Lund, Sweden
| | - Liis Reisberg
- Institute of Physics, University of Tartu, W. Ostwaldi 1, EE-50411 Tartu, Estonia
- MAX IV Laboratory, Lund University, PO Box 118, SE-22100 Lund, Sweden
| | - Marco Kirm
- Institute of Physics, University of Tartu, W. Ostwaldi 1, EE-50411 Tartu, Estonia
| | - Mika Valden
- Surface Science Group, Laboratory of Photonics, Tampere University of Technology, FIN-33101, Tampere, Finland
| | - Marko Huttula
- Nano and Molecular Systems Research Unit, University of Oulu, PO Box 3000, FIN-90014 Oulu, Finland
| | - Edwin Kukk
- Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland
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20
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León-Pimentel CI, Martínez-Jiménez M, Saint-Martin H. Study of the Elusive Hydration of Pb2+ from the Gas Phase to the Liquid Aqueous Solution: Modeling the Hemidirected Solvation with a Polarizable MCDHO Force-Field. J Phys Chem B 2019; 123:9155-9166. [DOI: 10.1021/acs.jpcb.9b04541] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. I. León-Pimentel
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apdo. Postal 48-3, Cuernavaca, Morelos 62251, Ḿexico
| | - M. Martínez-Jiménez
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apdo. Postal 48-3, Cuernavaca, Morelos 62251, Ḿexico
| | - H. Saint-Martin
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apdo. Postal 48-3, Cuernavaca, Morelos 62251, Ḿexico
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21
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Gupta A, Marzinek JK, Jefferies D, Bond PJ, Harryson P, Wohland T. The disordered plant dehydrin Lti30 protects the membrane during water-related stress by cross-linking lipids. J Biol Chem 2019; 294:6468-6482. [PMID: 30819802 DOI: 10.1074/jbc.ra118.007163] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 02/14/2019] [Indexed: 12/13/2022] Open
Abstract
Dehydrins are intrinsically disordered proteins, generally expressed in plants as a response to embryogenesis and water-related stress. Their suggested functions are in membrane stabilization and cell protection. All dehydrins contain at least one copy of the highly conserved K-segment, proposed to be a membrane-binding motif. The dehydrin Lti30 (Arabidopsis thaliana) is up-regulated during cold and drought stress conditions and comprises six K-segments, each with two adjacent histidines. Lti30 interacts with the membrane electrostatically via pH-dependent protonation of the histidines. In this work, we seek a molecular understanding of the membrane interaction mechanism of Lti30 by determining the diffusion and molecular organization of Lti30 on model membrane systems by imaging total internal reflection- fluorescence correlation spectroscopy (ITIR-FCS) and molecular dynamics (MD) simulations. The dependence of the diffusion coefficient explored by ITIR-FCS together with MD simulations yields insights into Lti30 binding, domain partitioning, and aggregation. The effect of Lti30 on membrane lipid diffusion was studied on fluorescently labeled supported lipid bilayers of different lipid compositions at mechanistically important pH conditions. In parallel, we compared the mode of diffusion for short individual K-segment peptides. The results indicate that Lti30 binds the lipid bilayer via electrostatics, which restricts the mobility of lipids and bound protein molecules. At low pH, Lti30 binding induced lipid microdomain formation as well as protein aggregation, which could be correlated with one another. Moreover, at physiological pH, Lti30 forms nanoscale aggregates when proximal to the membrane suggesting that Lti30 may protect the cell by "cross-linking" the membrane lipids.
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Affiliation(s)
- Anjali Gupta
- From the Center for BioImaging Sciences and.,the Department of Biological Sciences, National University of Singapore, 14 Science Dr. 4, Singapore 117543, Singapore
| | - Jan K Marzinek
- the Bioinformatics Institute (A*STAR), 30 Biopolis St., 07-01 Matrix, Singapore 138671, Singapore
| | - Damien Jefferies
- the Bioinformatics Institute (A*STAR), 30 Biopolis St., 07-01 Matrix, Singapore 138671, Singapore.,the School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Peter J Bond
- the Department of Biological Sciences, National University of Singapore, 14 Science Dr. 4, Singapore 117543, Singapore.,the Bioinformatics Institute (A*STAR), 30 Biopolis St., 07-01 Matrix, Singapore 138671, Singapore
| | - Pia Harryson
- the Department of Biochemistry and Biophysics, Arrhenius Laboratories for Natural Sciences, Stockholm University, SE-106 91 Stockholm, Sweden, and
| | - Thorsten Wohland
- From the Center for BioImaging Sciences and .,the Department of Biological Sciences, National University of Singapore, 14 Science Dr. 4, Singapore 117543, Singapore.,Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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22
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Berestova TV, Kuzina LG, Amineva NA, Faizrakhmanov IS, Massalimov IA, Mustafin AG. ATR-FTIR spectroscopic investigation of the cis- and trans- bis-( α -amino acids) copper(II) complexes. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.02.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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23
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Xu B, Jacobs MI, Kostko O, Ahmed M. Guanidinium Group Remains Protonated in a Strongly Basic Arginine Solution. Chemphyschem 2017; 18:1503-1506. [DOI: 10.1002/cphc.201700197] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Bo Xu
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Michael I. Jacobs
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Chemistry University of California Berkeley CA 94720 USA
| | - Oleg Kostko
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Musahid Ahmed
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
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24
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Jiang L, Zhu C, Fu Y, Yang G. Amino Acid Functionalization of Doped Single-Walled Carbon Nanotubes: Effects of Dopants and Side Chains as Well as Zwitterionic Stabilizations. J Phys Chem B 2017; 121:2721-2730. [PMID: 28301158 DOI: 10.1021/acs.jpcb.6b12199] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Functionalization of single-walled carbon nanotubes (SWCNTs) is necessitated in a number of conditions such as drug delivery, and here amino acid functionalization of SWCNTs is conducted within the framework of density functional theory. Functionalization efficiencies of Gly are largely determined by dopants, as a combined effect of atomic radius, electronic configuration, and distortion to SWCNTs. Different functionalization sites in Gly have divergent interaction strengths with M/SWCNTs that decline as Ob > N > Oa, and this trend seems almost independent of the identity of metallic dopants. B/SWCNT behaves distinctly and prefers to the N site. Dopants affect principally interaction strengths, while amino acids regulate significantly both functionalization configurations and interaction energies. Then focus is given to stabilization of zwitterionic amino acids due to enhanced interactions with the widely used zwitterionic drugs. All metallic dopants render zwitterionic Gly to be the most stable, and side chains in amino acids rather than dopants in M/SWCNTs cause more pronounced effects to zwitterionic stabilizations. Charge transfers between amino acids and M/SWCNTs are closely associated with zwitterionic stabilization effects, and different charge transfer mechanisms between M/SWCNTs and metal ions are interpreted. Thus, this work provides a comprehensive understanding of amino acid functionalization of M/SWCNTs.
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Affiliation(s)
- Lisha Jiang
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University , Harbin 150040, P. R. China.,College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University , Chongqing 400715, China
| | - Chang Zhu
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University , Chongqing 400715, China
| | - Yujie Fu
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University , Harbin 150040, P. R. China
| | - Gang Yang
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University , Chongqing 400715, China
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25
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Kusler K, Odoh SO, Silakov A, Poyton MF, Pullanchery S, Cremer PS, Gagliardi L. What Is the Preferred Conformation of Phosphatidylserine–Copper(II) Complexes? A Combined Theoretical and Experimental Investigation. J Phys Chem B 2016; 120:12883-12889. [DOI: 10.1021/acs.jpcb.6b10675] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kari Kusler
- Department
of Chemistry, Chemical Theory Center, and Minnesota Supercomputing
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Samuel O. Odoh
- Department
of Chemistry, Chemical Theory Center, and Minnesota Supercomputing
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Alexey Silakov
- Department
of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
| | - Matthew F. Poyton
- Department
of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
| | - Saranya Pullanchery
- Department
of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
| | - Paul S. Cremer
- Department
of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
| | - Laura Gagliardi
- Department
of Chemistry, Chemical Theory Center, and Minnesota Supercomputing
Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
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26
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Kocadağlı T, Gökmen V. Effects of Sodium Chloride, Potassium Chloride, and Calcium Chloride on the Formation of α-Dicarbonyl Compounds and Furfurals and the Development of Browning in Cookies during Baking. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:7838-7848. [PMID: 27690415 DOI: 10.1021/acs.jafc.6b03870] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Effects of NaCl, KCl, CaCl2, NaHCO3, and NH4HCO3 on the formation of glucosone, 1-deoxyglucosone, 3-deoxyglucosone, glyoxal, methylglyoxal, diacetyl, 5-hydroxymethyl-2-furfural, and 2-furfural and browning were investigated in cookies. The presence of 1.5% NaCl, 1% KCl, and 1% CaCl2 on flour basis had no effect on α-dicarbonyl compounds, except 1-deoxyglucosone increased in the presence of KCl and CaCl2. The increase in 5-hydroxymethyl-2-furfural formation in the presence of NaCl, KCl, and CaCl2 did not relate to 3-deoxyglucosone formation and pH changes. NaCl, KCl, and CaCl2 increased browning in cookies. Model reaction systems indicated that NaCl, KCl, and CaCl2 enhance browning by increasing furfurals in caramelization. NaCl, KCl, and CaCl2 decreased browning intensity in a heated glucose-glycine system. Use of CaCl2 in cookies may considerably increase furfurals but not α-dicarbonyl compounds. Sodium reduction can be obtained by replacement with potassium without sacrificing the desired consequences of caramelization in sugar-rich baked goods.
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Affiliation(s)
- Tolgahan Kocadağlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University , 06800 Beytepe Campus, Ankara, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University , 06800 Beytepe Campus, Ankara, Turkey
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27
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Kang N, Lin F, Zhao W, Lombardi JP, Almihdhar M, Liu K, Yan S, Kim J, Luo J, Hsiao BS, Poliks M, Zhong CJ. Nanoparticle–Nanofibrous Membranes as Scaffolds for Flexible Sweat Sensors. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00414] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
| | | | | | | | - Mihdhar Almihdhar
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Kai Liu
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | | | | | | | - Benjamin S. Hsiao
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
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28
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Salazar A, Keusgen M, von Hagen J. Amino acids in the cultivation of mammalian cells. Amino Acids 2016; 48:1161-71. [PMID: 26832172 PMCID: PMC4833841 DOI: 10.1007/s00726-016-2181-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 01/18/2016] [Indexed: 11/29/2022]
Abstract
Amino acids are crucial for the cultivation of mammalian cells. This importance of amino acids was realized soon after the development of the first cell lines, and a solution of a mixture of amino acids has been supplied to cultured cells ever since. The importance of amino acids is further pronounced in chemically defined mammalian cell culture media, making the consideration of their biological and chemical properties necessary. Amino acids concentrations have been traditionally adjusted to their cellular consumption rates. However, since changes in the metabolic equilibrium of amino acids can be caused by changes in extracellular concentrations, metabolomics in conjunction with flux balance analysis is being used in the development of culture media. The study of amino acid transporters is also gaining importance since they control the intracellular concentrations of these molecules and are influenced by conditions in cell culture media. A better understanding of the solubility, stability, dissolution kinetics, and interactions of these molecules is needed for an exploitation of these properties in the development of dry powdered chemically defined media for mammalian cells. Due to the complexity of these mixtures however, this has proven to be challenging. Studying amino acids in mammalian cell culture media will help provide a better understanding of how mammalian cells in culture interact with their environment. It would also provide insight into the chemical behavior of these molecules in solutions of complex mixtures, which is important in the understanding of the contribution of individual amino acids to protein structure.
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Affiliation(s)
- Andrew Salazar
- Institute of Pharmaceutical Chemistry, University of Marburg, 35032, Marburg, Germany.
- Biopharm Materials & Technologies R&D, Merck Lifescience, 64293, Darmstadt, Germany.
| | - Michael Keusgen
- Institute of Pharmaceutical Chemistry, University of Marburg, 35032, Marburg, Germany
| | - Jörg von Hagen
- Biopharm Materials & Technologies R&D, Merck Lifescience, 64293, Darmstadt, Germany
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29
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Ash T, Debnath T, Banu T, Das AK. Exploration of Binding Interactions of Cu2+ with d-Penicillamine and its O- and Se- Analogues in Both Gas and Aqueous Phases: A Theoretical Approach. J Phys Chem B 2016; 120:3467-78. [DOI: 10.1021/acs.jpcb.5b11825] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tamalika Ash
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Tanay Debnath
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Tahamida Banu
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Abhijit K. Das
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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30
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Farias APSF, Carneiro CEA, de Batista Fonseca IC, Zaia CTBV, Zaia DAM. The adsorption of amino acids and cations onto goethite: a prebiotic chemistry experiment. Amino Acids 2016; 48:1401-12. [PMID: 26984319 DOI: 10.1007/s00726-016-2191-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Accepted: 02/02/2016] [Indexed: 11/26/2022]
Abstract
Few prebiotic chemistry experiments have assessed the adsorption of biomolecules by iron oxide-hydroxides. The present work investigated the effects of cations in artificial seawaters on the adsorption of Gly, α-Ala and β-Ala onto goethite, and vice versa. Goethite served to concentrate K and Mg cations from solution; these effects could have played important roles in peptide nucleoside formation. Goethite showed low adsorption of Gly and α-Ala. On the other hand, β-Ala (a non-protein amino acid) was highly adsorbed by goethite. Because Gly and α-Ala are the most common amino acids in living beings, and iron oxide-hydroxides are widespread on Earth, additional iron oxides should be studied. Increased ionic strength in artificial seawaters decreased the adsorption of amino acids by goethite. Because Na was highly abundant in the artificial seawater, it showed the highest effect on amino acid adsorption. β-Ala increased the adsorption of K and Ca by goethite, this effect could have been important for peptide synthesis.
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Affiliation(s)
- Ana Paula S F Farias
- Laboratório de Química Prebiótica, Departamento de Química-CCE, Universidade Estadual de Londrina, Londrina, PR, 86051-990, Brazil
| | - Cristine E A Carneiro
- Laboratório de Química Prebiótica, Departamento de Química-CCE, Universidade Estadual de Londrina, Londrina, PR, 86051-990, Brazil
| | | | - Cássia T B V Zaia
- Departamento de Ciências Fisiológicas-CCB, Universidade Estadual de Londrina, Londrina, PR, 86051-990, Brazil
| | - Dimas A M Zaia
- Laboratório de Química Prebiótica, Departamento de Química-CCE, Universidade Estadual de Londrina, Londrina, PR, 86051-990, Brazil.
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31
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Sharma B, Neela YI, Narahari Sastry G. Structures and energetics of complexation of metal ions with ammonia, water, and benzene: A computational study. J Comput Chem 2016; 37:992-1004. [PMID: 26833683 DOI: 10.1002/jcc.24288] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 11/26/2015] [Accepted: 12/01/2015] [Indexed: 01/17/2023]
Affiliation(s)
- Bhaskar Sharma
- Center for Molecular Modelling; CSIR-Indian Institute of Chemical Technology; Tarnaka, Hyderabad Telangana 500 607 India
| | - Y. Indra Neela
- Center for Molecular Modelling; CSIR-Indian Institute of Chemical Technology; Tarnaka, Hyderabad Telangana 500 607 India
| | - G. Narahari Sastry
- Center for Molecular Modelling; CSIR-Indian Institute of Chemical Technology; Tarnaka, Hyderabad Telangana 500 607 India
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32
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Yang G, Zhou L, Chen Y. Stabilization of zwitterionic versus canonical proline by water molecules. SPRINGERPLUS 2016; 5:19. [PMID: 26759758 PMCID: PMC4703596 DOI: 10.1186/s40064-015-1661-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 12/28/2015] [Indexed: 11/10/2022]
Abstract
At physiological conditions, a majority of biomolecules (e.g., amino acids, peptides and proteins) exist predominantly in the zwitterionic form that usually decides the biological functions. However, zwitterionic amino acids are not geometrically stable in gas phase and this seriously hampers the understanding of their structures, properties and biological functions. To this end, one of the recent research focuses is to demonstrate the stabilization effects of zwitterionic amino acids. Relative stabilities of canonical conformers are dependent on water contents, while zwitterionic stability improves monotonously and pronouncedly with increase of water contents. We find that one water molecule can render zwitterionic proline geometrically stable, and stabilities of different zwitterionic amino acids increase as glycine
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Affiliation(s)
- Gang Yang
- />College of Resource and Environment and Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, 400715 Chongqing, People’s Republic of China
| | - Lijun Zhou
- />College of Resource and Environment and Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, 400715 Chongqing, People’s Republic of China
| | - Yang Chen
- />College of Chemistry Chemical Engineering and Environmental Engineering, Liaoning Shihua University, 113001 Fushun, Liaoning People’s Republic of China
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33
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Gao K, Yin J, Henriksen NM, Fenley AT, Gilson MK. Binding enthalpy calculations for a neutral host-guest pair yield widely divergent salt effects across water models. J Chem Theory Comput 2015; 11:4555-64. [PMID: 26574247 DOI: 10.1021/acs.jctc.5b00676] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Dissolved salts are a part of the physiological milieu and can significantly influence the kinetics and thermodynamics of various biomolecular processes, such as binding and catalysis; thus, it is important for molecular simulations to reliably describe their effects. The present study uses a simple, nonionized host-guest model system to study the sensitivity of computed binding enthalpies to the choice of water and salt models. Molecular dynamics simulations of a cucurbit[7]uril host with a neutral guest molecule show striking differences in the salt dependency of the binding enthalpy across four water models, TIP3P, SPC/E, TIP4P-Ew, and OPC, with additional sensitivity to the choice of parameters for sodium and chloride. In particular, although all of the models predict that binding will be less exothermic with increasing NaCl concentration, the strength of this effect varies by 7 kcal/mol across models. The differences appear to result primarily from differences in the number of sodium ions displaced from the host upon binding the guest rather than from differences in the enthalpy associated with this displacement, and it is the electrostatic energy that contributes most to the changes in enthalpy with increasing salt concentration. That a high sensitivity of salt affecting the choice of water model, as observed for the present host-guest system despite it being nonionized, raises issues regarding the selection and adjustment of water models for use with biological macromolecules, especially as these typically possess multiple ionized groups that can interact relatively strongly with ions in solution.
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Affiliation(s)
- Kaifu Gao
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093-0736, United States
| | - Jian Yin
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093-0736, United States
| | - Niel M Henriksen
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093-0736, United States
| | - Andrew T Fenley
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093-0736, United States
| | - Michael K Gilson
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093-0736, United States
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34
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Chon NL, Osterberg JR, Henderson J, Khan HM, Reuter N, Knight JD, Lin H. Membrane Docking of the Synaptotagmin 7 C2A Domain: Computation Reveals Interplay between Electrostatic and Hydrophobic Contributions. Biochemistry 2015; 54:5696-711. [DOI: 10.1021/acs.biochem.5b00422] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Nara Lee Chon
- Department
of Chemistry, University of Colorado Denver, Denver, Colorado 80217-3364, United States
| | - J. Ryan Osterberg
- Department
of Chemistry, University of Colorado Denver, Denver, Colorado 80217-3364, United States
| | - Jack Henderson
- Department
of Chemistry, University of Colorado Denver, Denver, Colorado 80217-3364, United States
| | - Hanif M. Khan
- Department
of Molecular Biology, University of Bergen, 5008 Bergen, Norway
- Computational
Biology Unit, Department of Informatics, University of Bergen, 5008 Bergen, Norway
| | - Nathalie Reuter
- Department
of Molecular Biology, University of Bergen, 5008 Bergen, Norway
- Computational
Biology Unit, Department of Informatics, University of Bergen, 5008 Bergen, Norway
| | - Jefferson D. Knight
- Department
of Chemistry, University of Colorado Denver, Denver, Colorado 80217-3364, United States
| | - Hai Lin
- Department
of Chemistry, University of Colorado Denver, Denver, Colorado 80217-3364, United States
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35
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Zhang Q, Meng XJ. The mechanisms of α- H and proton transfers of glycine induced by Mg2+. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2015. [DOI: 10.1142/s021963361550008x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A MP2/6-31++G(d,p)//B3LYP/6-31++G(d,p) method was used to investigate the mechanisms of α- H and proton transfers of glycine induced by Mg 2+. Eight complexes were obtained, six of which were neutral and the other two were zwitterionic. Among them, the zwitterion with a binding energy of 159.4 kcal/mol was the most stable structure. Conformation transformations of the complexes caused by the rotation of single bond and the transfers of α- H and proton were completed via seven transition states. The inductive effect of Mg 2+ made the electron cloud of glycine deviate to Mg 2+, which activated the covalent bond involving the transferred proton. The neutral complex can be turned into the zwitterionic one by the transfers of both carboxyl hydrogen and α- H , and the energy barrier of each reaction was less than 9.2 kcal/mol. After the transfer of α- H , a delocalized π bond was formed in glycine skeleton and the α- C atom took 0.19 positive charges. So the chemical activity of the glycine enhanced, and glycine was readily available for addition and nucleophilic substitution reactions. The path from the most stable glycine conformer G1 to the zwitterionic conformation I is G1 → G1–G3 → G3 → G3–G4 → G4 → G2–G4 → G2 → VI → I–VI → I, and the highest energy barrier of this path is 9.2 kcal/mol.
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Affiliation(s)
- Qing Zhang
- Department of Chemistry, Tangshan Normal University, Tangshan 063000, P. R. China
| | - Xiang-Jun Meng
- Department of Chemistry, Tangshan Normal University, Tangshan 063000, P. R. China
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36
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Kowalska-Baron A. Theoretical study of the complexes of tyrosine and tryptophan with biologically important metal cations in aqueous solutions. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.01.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Remko M, Broer R, Remková A, Van Duijnen PT. How strong are Ca2+–heparin and Zn2+–heparin interactions? Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.12.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Bourcier S, Chiaa RX, Mimbong RNB, Bouchoux G. Gas-phase lithium cation affinity of glycine. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2015; 21:149-159. [PMID: 26307695 DOI: 10.1255/ejms.1299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The gas-phase lithium cation binding thermochemistry of glycine has been determined theoretically by quantum chemical calculations at the G4 level and experimentally by the extended kinetic method using electrospray ionization quadrupole time-of-flight tandem mass spectrometry. The lithium cation affinity of glycine, ∆(Li)H°(298)(GLY), i.e. the∆(Li)H°(298) of the reaction GlyLi(+)→ Gly + Li(+)) given by the G4 method is equal to 241.4 kJ.mol(-1) if only the most stable conformer of glycine is considered or to 242.3 kJ.mol(-1) if the 298K equilibrium mixture of neutral conformers is included in the calculation. The ∆(Li)H°(298)(GLY) deduced from the extended kinetic method is obviously dependent on the choice of the Li(+) affinity scale, thus∆(Li)H°(298)(GLY) is equal to 228.7±0.9(2.0) kJ.mol(- 1) if anchored to the recently re-evaluated lithium cation affinity scale but shifted to 235.4±1.0 kJ.mol(-1) if G4 computed lithium cation affinities of the reference molecules is used. This difference of 6.3 kJ.mol(-1) may originate from a compression of the experimental lithium affinity scale in the high ∆(Li)H°(298) region. The entropy change associated with the reaction GlyLi(+)→Gly + Li(+) reveals a gain of approximately 15 J.mol(-) 1.K(-1) with respect to monodentate Li(+) acceptors. The origin of this excess entropy is attributed to the bidentate interaction between the Li(+) cation and both the carbonyl oxygen and the nitrogen atoms of glycine. The computed G4 Gibbs free energy,∆(Li)G°(298)(GLY) is equal to 205.3 kJ.mol(-1), a similar result, 201.0±3.4 kJ.mol(-1), is obtained from the experiment if the∆(Li)G°(298) of the reference molecules is anchored on the G4 results.
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Affiliation(s)
- Sophie Bourcier
- Laboratoire de Chimie Moléculaire. Ecole Polytechnique. UMR 9168 CNRS 91128 Palaiseau, France.
| | - Ru Xuan Chiaa
- N anyang Technological University. 21 Nanyang Link. 637371 Singapore
| | | | - Guy Bouchoux
- Laboratoire de Chimie Moléculaire. Ecole Polytechnique. UMR 9168 CNRS. 91128 Palaiseau, France. Université Paris-Sud XI. 91400 Orsay, France.
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39
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Tomé LIN, Sousa CSR, Gomes JRB, Ferreira O, Coutinho JAP, Pinho SP. Understanding the cation specific effects on the aqueous solubility of amino acids: from mono to polyvalent cations. RSC Adv 2015. [DOI: 10.1039/c5ra00501a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Based on solubility and molecular dynamics studies, a consistent and refined molecular description of the effect of the cation on the solubility of amino acids based on specific interactions of the cations with the negatively charged moieties of the biomolecules is proposed.
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Affiliation(s)
- L. I. N. Tomé
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - C. S. R. Sousa
- LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM
- Instituto Politécnico de Bragança
- Bragança
- Portugal
| | - J. R. B. Gomes
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - O. Ferreira
- LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM
- Instituto Politécnico de Bragança
- Bragança
- Portugal
| | - J. A. P. Coutinho
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - S. P. Pinho
- LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM
- Instituto Politécnico de Bragança
- Bragança
- Portugal
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Zwitterionic versus canonical amino acids over the various defects in zeolites: a two-layer ONIOM calculation. Sci Rep 2014; 4:6594. [PMID: 25307449 PMCID: PMC4194432 DOI: 10.1038/srep06594] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 09/17/2014] [Indexed: 12/01/2022] Open
Abstract
Defects are often considered as the active sites for chemical reactions. Here a variety of defects in zeolites are used to stabilize zwitterionic glycine that is not self-stable in gas phase; in addition, effects of acidic strengths and zeolite channels on zwitterionic stabilization are demonstrated. Glycine zwitterions can be stabilized by all these defects and energetically prefer to canonical structures over Al and Ga Lewis acidic sites rather than Ti Lewis acidic site, silanol and titanol hydroxyls. For titanol (Ti-OH), glycine interacts with framework Ti and hydroxyl sites competitively, and the former with Lewis acidity predominates. The transformations from canonical to zwitterionic glycine are obviously more facile over Al and Ga Lewis acidic sites than over Ti Lewis acidic site, titanol and silanol hydroxyls. Charge transfers that generally increase with adsorption energies are found to largely decide the zwitterionic stabilization effects. Zeolite channels play a significant role during the stabilization process. In absence of zeolite channels, canonical structures predominate for all defects; glycine zwitterions remain stable over Al and Ga Lewis acidic sites and only with synergy of H-bonding interactions can exist over Ti Lewis acidic site, while automatically transform to canonical structures over silanol and titanol hydroxyls.
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41
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Dhaked DK, Bharatam PV. Conformational and zwitterionic preferences of N-amidinoglycine: the effect of microsolvation and metal ion addition. RSC Adv 2014. [DOI: 10.1039/c4ra06079b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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42
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Park T, Kyung D, Lee W. Effect of organic matter on CO(2) hydrate phase equilibrium in phyllosilicate suspensions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:6597-6603. [PMID: 24844562 DOI: 10.1021/es405099z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, we examined various CO2 hydrate phase equilibria under diverse, heterogeneous conditions, to provide basic knowledge for successful ocean CO2 sequestration in offshore marine sediments. We investigated the effect of geochemical factors on CO2 hydrate phase equilibrium. The three-phase (liquid-hydrate-vapor) equilibrium of CO2 hydrate in the presence of (i) organic matter (glycine, glucose, and urea), (ii) phyllosilicates [illite, kaolinite, and Na-montmorillonite (Na-MMT)], and (iii) mixtures of them was measured in the ranges of 274.5-277.0 K and 14-22 bar. Organic matter inhibited the phase equilibrium of CO2 hydrate by association with water molecules. The inhibition effect decreased in the order: urea < glycine < glucose. Illite and kaolinite (unexpandable clays) barely affected the CO2 hydrate phase equilibrium, while Na-MMT (expandable clay) affected the phase equilibrium because of its interlayer cations. The CO2 hydrate equilibrium conditions, in the illite and kaolinite suspensions with organic matter, were very similar to those in the aqueous organic matter solutions. However, the equilibrium condition in the Na-MMT suspension with organic matter changed because of reduction of its inhibition effect by intercalated organic matter associated with cations in the Na-MMT interlayer.
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Affiliation(s)
- Taehyung Park
- Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology , 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea
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43
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Theoretical study of hydrated Ca2+-amino acids (glycine, threonine and phenylalanine) clusters. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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44
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Ganesan A, Dreyer J, Wang F, Akola J, Larrucea J. Density functional study of Cu2+-phenylalanine complex under micro-solvation environment. J Mol Graph Model 2013; 45:180-91. [DOI: 10.1016/j.jmgm.2013.08.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 07/15/2013] [Accepted: 08/17/2013] [Indexed: 10/26/2022]
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45
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Witwicki M, Jezierska J. DFT insight into o-semiquinone radicals and Ca2+ ion interaction: structure, g tensor, and stability. Theor Chem Acc 2013. [DOI: 10.1007/s00214-013-1383-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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46
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Latrous L, Tortajada J, Haldys V, Léon E, Correia C, Salpin JY. Gas-phase interactions of organotin compounds with glycine. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:795-806. [PMID: 23832935 DOI: 10.1002/jms.3223] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 03/08/2013] [Accepted: 04/22/2013] [Indexed: 06/02/2023]
Abstract
Gas-phase interactions of organotins with glycine have been studied by combining mass spectrometry experiments and quantum calculations. Positive-ion electrospray spectra show that the interaction of di- and tri-organotins with glycine results in the formation of [(R)2Sn(Gly)-H](+) and [(R)3Sn(Gly)](+) ions, respectively. Di-organotin complexes appear much more reactive than those involving tri-organotins. (MS/MS) spectra of the [(R)3Sn(Gly)](+) ions are indeed simple and only show elimination of intact glycine, generating the [(R)3Sn](+) carbocation. On the other hand, MS/MS spectra of [(R)2Sn(Gly)-H](+) complexes are characterized by numerous fragmentation processes. Six of them, associated with elimination of H2O, CO, H2O + CO and formation of [(R)2SnOH](+) (-57 u),[(R)2SnNH2](+) (-58 u) and [(R)2SnH](+) (-73 u), are systematically observed. Use of labeled glycines notably concludes that the hydrogen atoms eliminated in water and H2O + CO are labile hydrogens. A similar conclusion can be made for hydrogens of [(R2)SnOH](+) and [(R2)SnNH2](+) ions. Interestingly, formation [(R)2SnH](+) ions is characterized by a migration of one the α hydrogen of glycine onto the metallic center. Finally, several dissociation routes are observed and are characteristic of a given organic substituent. Calculations indicated that the interaction between organotins and glycine is mostly electrostatic. For [(R)2Sn(Gly)-H](+) complexes, a preferable bidentate interaction of the type η(2)-O,NH2 is observed, similar to that encountered for other metal ions. [(R)3Sn](+) ions strongly stabilize the zwitterionic form of glycine, which is practically degenerate with respect to neutral glycine. In addition, the interconversion between both forms is almost barrierless. Suitable mechanisms are proposed in order to account for the most relevant fragmentation processes.
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Affiliation(s)
- Latifa Latrous
- Laboratoire de Chimie-Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire, 2092, El Manar, Tunis, Tunisia.
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47
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Tomé LIN, Pinho SP, Jorge M, Gomes JRB, Coutinho JAP. Salting-in with a salting-out agent: explaining the cation specific effects on the aqueous solubility of amino acids. J Phys Chem B 2013; 117:6116-28. [PMID: 23638911 DOI: 10.1021/jp4021307] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Although the understanding of ion specific effects on the aqueous solubilities of biomolecules is crucial for the development of many areas of biochemistry and life sciences, a consensual and well-supported molecular picture of the phenomena has not yet been established. Mostly, the influence of cations and the nature of the molecular interactions responsible for the reversal of the Hofmeister trend in aqueous solutions of amino acids and proteins are still defectively understood. Aiming at contributing to the understanding of the molecular-level mechanisms governing the cation specific effects on the aqueous solubilities of biocompounds, experimental solubility measurements and classical molecular dynamics simulations were performed for aqueous solutions of three amino acids (alanine, valine, and isoleucine), in the presence of a series of inorganic salts. The evidence gathered suggests that the mechanism by which salting-in inducing cations operate in aqueous solutions of amino acids is different from that of anions, and allows for a novel and consistent molecular description of the effect of the cation on the solubility based on specific interactions of the cations with the negatively charged moieties of the biomolecules.
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Affiliation(s)
- Luciana I N Tomé
- CICECO, Departamento de Química, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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48
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Khodabandeh MH, Reisi H, Davari MD, Zare K, Zahedi M, Ohanessian G. Interaction Modes and Absolute Affinities of α-Amino Acids for Mn2+: A Comprehensive Picture. Chemphyschem 2013; 14:1733-45. [DOI: 10.1002/cphc.201200964] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 02/13/2013] [Indexed: 11/07/2022]
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49
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Dubina MV, Vyazmin SY, Boitsov VM, Nikolaev EN, Popov IA, Kononikhin AS, Eliseev IE, Natochin YV. Potassium ions are more effective than sodium ions in salt induced peptide formation. ORIGINS LIFE EVOL B 2013; 43:109-17. [PMID: 23536046 PMCID: PMC3676736 DOI: 10.1007/s11084-013-9326-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 01/17/2013] [Indexed: 11/25/2022]
Abstract
Prebiotic peptide formation under aqueous conditions in the presence of metal ions is one of the plausible triggers of the emergence of life. The salt-induced peptide formation reaction has been suggested as being prebiotically relevant and was examined for the formation of peptides in NaCl solutions. In previous work we have argued that the first protocell could have emerged in KCl solution. Using HPLC-MS/MS analysis, we found that K+ is more than an order of magnitude more effective in the L-glutamic acid oligomerization with 1,1'-carbonyldiimidazole in aqueous solutions than the same concentration of Na+, which is consistent with the diffusion theory calculations. We anticipate that prebiotic peptides could have formed with K+ as the driving force, not Na+, as commonly believed.
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Affiliation(s)
- Michael V Dubina
- St Petersburg Academic University - Nanotechnology Research and Education Centre RAS, 8/3 Khlopin str, 194021, St Petersburg, Russia.
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50
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Remko M, Van Duijnen PT, Broer R. Effect of metal ions (Li+, Na+, K+, Mg2+ and Ca2+) and water on the conformational changes of glycosidic bonds in heparin oligosaccharides. RSC Adv 2013. [DOI: 10.1039/c3ra40566d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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