1
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Reigl S, Van Driessche AES, Ullrich T, Koltzenburg S, Kunz W, Kellermeier M. Organic solvent-free synthesis of calcium sulfate hemihydrate at room temperature. Chem Commun (Camb) 2024; 60:610-613. [PMID: 38099963 DOI: 10.1039/d3cc02552g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
Calcium sulfate hemihydrate, also known as bassanite or Plaster of Paris, is one of the most extensively produced inorganic materials worldwide. Nowadays, bassanite is mainly obtained by thermal dehydration of calcium sulfate dihydrate (gypsum) - a process that consumes considerable amounts of energy and thus leaves a significant carbon footprint. Towards a more sustainable future, alternative technologies for bassanite production at low temperatures are therefore urgently required. While successful approaches involving organic solvents have been reported, we chose precipitation from aqueous solutions as a potentially even "greener" way of synthesis. In a previous work, we have shown that spontaneous formation of bassanite in water (in competition with thermodynamically favoured gypsum) can be achieved at 40 °C by the use of additives that maintain specific interactions with calcium sulfate precursors and modulate the local hydration household during crystallisation. The results of the present study demonstrate that bassanite can be obtained via simple precipitation from aqueous solutions at room temperature by the combination of additives acting through orthogonal mechanisms.
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Affiliation(s)
- Selina Reigl
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstr. 31, Regensburg D-93040, Germany.
| | - Alexander E S Van Driessche
- Instituto Andaluz de Ciencias de la Tierra (IACT), CSIC - University of Granada, Armilla E-18100, Granada, Spain
| | - Timo Ullrich
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstr. 31, Regensburg D-93040, Germany.
| | | | - Werner Kunz
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstr. 31, Regensburg D-93040, Germany.
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2
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Wang Y, Ye S, Sun Z, Zhu J, Liu Y, Wang R, Lin F, Zhang W, Yang Y, Wang C. Multifunctional Regioisomeric Passivation Strategy for Fabricating Self-Driving, High Detectivity All-Inorganic Perovskite Photodetectors. ACS APPLIED MATERIALS & INTERFACES 2023; 15:59005-59015. [PMID: 38055857 DOI: 10.1021/acsami.3c12714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
The fluorination of the aromatic multifunctional Lewis base passivation strategy has been demonstrated recently as an effective approach to markedly enhance the performance of perovskite photovoltaic devices. However, the regulation mechanisms of the passivation efficiency by varying the functional group position of fluorine (F) in the regioisomers have received little attention and inadequate research. Herein, a pair of bifluorine-substituted aminobenzoic acid regioisomers [3-amino-2,6-difluorobenzoic acid (13-FABA) and 4-amino-3,5-difluorobenzoic acid (14-FABA)] were employed to investigate the passivation effects of Lewis bases dependent on behaviors of the ortho/meta-substituted position of fluorine. The density functional theory calculation on electron cloud density, interaction energy, and the basicity of Lewis bases combined with experimental evidence reveal that the ortho-effect induced by fluorine substitution weakens the passivating effect of 13-FABA Lewis base and induces its molecular propensity to form internal salts, accelerating the degradation and deterioration of the device performance. Conversely, 14-FABA with meta-connected fluorine atoms exhibit superior efficacy in suppressing defects and enhancing hydrophobicity. Eventually, the 14-FABA-modified photodetectors (PDs) achieved a high detectivity of 1.69 × 1013 Jones, the comparatively lower dark current density of 2.2 × 10-10 A/cm2 among all-inorganic perovskite PD systems. Our work has not only clarified the fundamental mechanisms of the F-substituted position effects of Lewis base on suppressing defects but also provided a promising passivation strategy for perovskite films via designing the regioisomeric atoms in a multifunctional Lewis base molecule.
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Affiliation(s)
- Yong Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Shuming Ye
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Ziwei Sun
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Jiajun Zhu
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Ye Liu
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Rongfei Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Feng Lin
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Wenhua Zhang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Yu Yang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
| | - Chong Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China
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3
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Rezaie A, Ghasemi H, Eslami F. An in-depth investigation of the impact of salt nature on the formulation of microemulsion systems. Sci Rep 2023; 13:14362. [PMID: 37658147 PMCID: PMC10474266 DOI: 10.1038/s41598-023-40761-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 08/16/2023] [Indexed: 09/03/2023] Open
Abstract
Electrolytes have a wide range of technological applications. Despite the recent improvements in characterizing and predicting the phase behavior of microemulsion systems by hydrophilic-lipophilic deviation (HLD) and net-average curvature (NAC) frameworks, they are ineffective in the presence of different salts. This work seeks to bridge this gap by investigating the influence of salt nature on the microemulsion phase formulation. First, a one-dimensional salinity scan on different microemulsion systems consisting of sodium dodecyl benzene sulfonate as a surfactant, hexane as an oil and, several brines was carried out, and the effect of each salt on the phase behavior were precisely evaluated. The results for optimum salinity and solubilization parameter of different salts were consistent with the Hofmeister series. In addition, multiple linear regression model is presented to accurately predicting the optimum salinity of different salts using this research data and all the available experimental data. The results revealed that the values estimated by this model is in significant consistency with the experimental data by correlation coefficient of 0.92. Finally, the effect of salt type on the NAC parameters (length parameter, and characteristic length[Formula: see text] were evaluated to improve the predicting ability of this equation of state in the presence of various salts. We found that salt nature has a significant impact on both these parameters. It was found that the length parameter is linearly dependent on the optimum ionic strength of salts while the salting-out capacity of each salt was predominant factor affecting the characteristic length.
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Affiliation(s)
- Ali Rezaie
- Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad HWY, P.O. Box: 14115-111, Tehran, Iran
| | - Hassan Ghasemi
- Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad HWY, P.O. Box: 14115-111, Tehran, Iran
| | - Fatemeh Eslami
- Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad HWY, P.O. Box: 14115-111, Tehran, Iran.
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4
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Robertson H, Willott JD, Gregory KP, Johnson EC, Gresham IJ, Nelson ARJ, Craig VSJ, Prescott SW, Chapman R, Webber GB, Wanless EJ. From Hofmeister to hydrotrope: Effect of anion hydrocarbon chain length on a polymer brush. J Colloid Interface Sci 2023; 634:983-994. [PMID: 36571860 DOI: 10.1016/j.jcis.2022.12.114] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 12/07/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
HYPOTHESIS Specific ion effects govern myriad biological phenomena, including protein-ligand interactions and enzyme activity. Despite recent advances, detailed understanding of the role of ion hydrophobicity in specific ion effects, and the intersection with hydrotropic effects, remains elusive. Short chain fatty acid sodium salts are simple amphiphiles which play an integral role in our gastrointestinal health. We hypothesise that increasing a fatty acid's hydrophobicity will manifest stronger salting-out behaviour. EXPERIMENTS Here we study the effect of these amphiphiles on an exemplar thermoresponsive polymer brush system, conserving the carboxylate anion identity while varying anion hydrophobicity via the carbon chain length. Ellipsometry and quartz crystal microbalance with dissipation monitoring were used to characterise the thermoresponse and viscoelasticity of the brush, respectively, whilst neutron reflectometry was used to reveal the internal structure of the brush. Diffusion-ordered nuclear magnetic resonance spectroscopy and computational investigations provide insight into polymer-ion interactions. FINDINGS Surface sensitive techniques unveiled a non-monotonic trend in salting-out ability with increasing anion hydrophobicity, revealing the bundle-like morphology of the ion-collapsed system. An intersection between ion-specific and hydrotropic effects was observed both experimentally and computationally; trending from good anti-hydrotrope towards hydrotropic behaviour with increasing anion hydrophobicity, accompanying a change in hydrophobic hydration.
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Affiliation(s)
- Hayden Robertson
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Joshua D Willott
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Kasimir P Gregory
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia; Department of Materials Physics, Research School of Physics, Australian National University, Canberra, ACT 0200, Australia
| | - Edwin C Johnson
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia; Department of Chemistry, The University of Sheffield, Sheffield, UK
| | - Isaac J Gresham
- School of Chemical Engineering, UNSW Sydney, Sydney, NSW 2052, Australia; School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Andrew R J Nelson
- Australian Centre for Neutron Scattering, ANSTO, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Vincent S J Craig
- Department of Materials Physics, Research School of Physics, Australian National University, Canberra, ACT 0200, Australia
| | - Stuart W Prescott
- School of Chemical Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Robert Chapman
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Grant B Webber
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Erica J Wanless
- College of Science, Engineering and Environment, University of Newcastle, Callaghan, NSW 2308, Australia.
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5
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Ulmann N, Häckl K, Touraud D, Kunz W. Investigation of the salting-in/-out, hydrotropic and surface-active behavior of plant-based hormone and phenolic acid salts. J Colloid Interface Sci 2023; 641:631-642. [PMID: 36963256 DOI: 10.1016/j.jcis.2023.03.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/07/2023] [Accepted: 03/10/2023] [Indexed: 03/17/2023]
Abstract
HYPOTHESIS The role of hormones and polyphenolic acids in communication and regulation of biological processes can be linked to their physical-chemical interaction with target compounds and water. Further, the variety of polyphenolic acids suggests adjustable hydrotropic properties of these natural compounds. EXPERIMENTS Phase transition temperature (PTT) measurements of binary water/di(propylene glycol) n-propyl ether (DPnP) or propylene glycol n-propyl ether (PnP) systems with sodium dehydroepiandrosterone sulfate (NaDHEAS), indole-3-acetate (NaIAA), indole-3-butyrate (NaIBA) - common hormones -, and sodium polyphenolates should unravel their salting-in/-out properties. Their salting-in/-out behavior was compared to the compounds' surface-active and structuring properties via surface tension, dynamic light scattering (DLS) and Nuclear magnetic resonance (NMR) experiments. FINDINGS All hormone salts were revealed as salting-in agents. PTT, surface tension and DLS measurements indicated surfactant-like behavior of the hormone NaDHEAS, and hydrotropic behavior of NaIAA and NaIBA. The salting-in/-out properties of sodium polyphenolates - in an (anti-)hydrotrope range - are adjustable with functional groups. The (i) absence of nano-structuring in pure water, (ii) the reduction of the DPnP nano-structuring in water in presence of sodium polyphenolates and (iii) the absence of a slope change of the PTT curves at the critical aggregation concentration showed that the DPnP/polyphenolate interactions are of molecular hydrotropic and not of micellar/aggregative nature.
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Affiliation(s)
- Nadja Ulmann
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse, 31, 93053 Regensburg, Germany.
| | - Katharina Häckl
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse, 31, 93053 Regensburg, Germany
| | - Didier Touraud
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse, 31, 93053 Regensburg, Germany
| | - Werner Kunz
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse, 31, 93053 Regensburg, Germany.
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6
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Paccione G, Robles-Ramos MÁ, Alfonso C, Sobrinos-Sanguino M, Margolin W, Zorrilla S, Monterroso B, Rivas G. Lipid Surfaces and Glutamate Anions Enhance Formation of Dynamic Biomolecular Condensates Containing Bacterial Cell Division Protein FtsZ and Its DNA-Bound Regulator SlmA. Biochemistry 2022; 61:2482-2489. [PMID: 36315857 PMCID: PMC9670838 DOI: 10.1021/acs.biochem.2c00424] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Dynamic biomolecular condensates formed by liquid-liquid phase separation can regulate the spatial and temporal organization of proteins, thus modulating their functional activity in cells. Previous studies showed that the cell division protein FtsZ from Escherichia coli formed dynamic phase-separated condensates with nucleoprotein complexes containing the FtsZ spatial regulator SlmA under crowding conditions, with potential implications for condensate-mediated spatiotemporal control of FtsZ activity in cell division. In the present study, we assessed formation of these condensates in the presence of lipid surfaces and glutamate ions to better approximate the E. coli intracellular environment. We found that potassium glutamate substantially promoted the formation of FtsZ-containing condensates when compared to potassium chloride in crowded solutions. These condensates accumulated on supported lipid bilayers and eventually fused, resulting in a time-dependent increase in the droplet size. Moreover, the accumulated condensates were dynamic, capturing protein from the external phase. FtsZ partitioned into the condensates at the lipid surface only in its guanosine diphosphate (GDP) form, regardless of whether it came from FtsZ polymer disassembly upon guanosine triphosphate (GTP) exhaustion. These results provide insights into the behavior of these GTP-responsive condensates in minimal membrane systems, which suggest how these membraneless assemblies may tune critical bacterial division events during the cell cycle.
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Affiliation(s)
- Gianfranco Paccione
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain
| | - Miguel Á. Robles-Ramos
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain
| | - Carlos Alfonso
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain
| | - Marta Sobrinos-Sanguino
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain
| | - William Margolin
- Department
of Microbiology and Molecular Genetics, McGovern Medical School, University of Texas, Houston, Texas 77030, United States
| | - Silvia Zorrilla
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain,E-mail:
| | - Begoña Monterroso
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain,E-mail:
| | - Germán Rivas
- Centro
de Investigaciones Biológicas Margarita Salas, Consejo Superior de Investigaciones Científicas (CSIC), 28040 Madrid, Spain,E-mail:
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7
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Ya. Zakharova L, Vasilieva EA, Mirgorodskaya AB, Zakharov SV, Pavlov RV, Kashapova NE, Gaynanova GA. Hydrotropes: solubilization of nonpolar compounds and modification of surfactant solutions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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8
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Budpud K, Okeyoshi K, Okajima MK, Kaneko T. Cyanobacterial supra‐polysaccharide: Self‐similar hierarchy, diverse morphology, and application prospects of sacran fibers. Biopolymers 2022; 113:e23522. [DOI: 10.1002/bip.23522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 07/01/2022] [Accepted: 07/05/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Kulisara Budpud
- Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan
| | - Kosuke Okeyoshi
- Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan
| | - Maiko K. Okajima
- Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan
| | - Tatsuo Kaneko
- Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan
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9
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An aqueous hydrotropic solution as environmentally benign reaction medium for organic transformations: a short review. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04761-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Gregory KP, Elliott GR, Robertson H, Kumar A, Wanless EJ, Webber GB, Craig VSJ, Andersson GG, Page AJ. Understanding specific ion effects and the Hofmeister series. Phys Chem Chem Phys 2022; 24:12682-12718. [PMID: 35543205 DOI: 10.1039/d2cp00847e] [Citation(s) in RCA: 85] [Impact Index Per Article: 42.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Specific ion effects (SIE), encompassing the Hofmeister Series, have been known for more than 130 years since Hofmeister and Lewith's foundational work. SIEs are ubiquitous and are observed across the medical, biological, chemical and industrial sciences. Nevertheless, no general predictive theory has yet been able to explain ion specificity across these fields; it remains impossible to predict when, how, and to what magnitude, a SIE will be observed. In part, this is due to the complexity of real systems in which ions, counterions, solvents and cosolutes all play varying roles, which give rise to anomalies and reversals in anticipated SIEs. Herein we review the historical explanations for SIE in water and the key ion properties that have been attributed to them. Systems where the Hofmeister series is perturbed or reversed are explored, as is the behaviour of ions at the liquid-vapour interface. We discuss SIEs in mixed electrolytes, nonaqueous solvents, and in highly concentrated electrolyte solutions - exciting frontiers in this field with particular relevance to biological and electrochemical applications. We conclude the perspective by summarising the challenges and opportunities facing this SIE research that highlight potential pathways towards a general predictive theory of SIE.
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Affiliation(s)
- Kasimir P Gregory
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia. .,Department of Materials Physics, Research School of Physics, Australian National University, Canberra, ACT 0200, Australia
| | - Gareth R Elliott
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
| | - Hayden Robertson
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
| | - Anand Kumar
- Flinders Institute of Nanoscale Science and Technology, College of Science and Engineering, Flinders University, South Australia 5001, Australia
| | - Erica J Wanless
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
| | - Grant B Webber
- School of Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Vincent S J Craig
- Department of Materials Physics, Research School of Physics, Australian National University, Canberra, ACT 0200, Australia
| | - Gunther G Andersson
- Flinders Institute of Nanoscale Science and Technology, College of Science and Engineering, Flinders University, South Australia 5001, Australia
| | - Alister J Page
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
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11
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Stemplinger S, Causse J, Prévost S, Pellet-Rostaing S, Zemb T, Horinek D. Short-chain branched sulfosuccinate as a missing link between surfactants and hydrotropes. Phys Chem Chem Phys 2022; 24:11353-11361. [PMID: 35485971 DOI: 10.1039/d1cp04849j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Surfactants aggregate in water into micelles, and these micelles incorporate organic substances to solubilize them. Hydrotropes are compounds that increase the solubility of hydrophobic substances in water without this form of aggregation. Decreasing the chain length of the classical surfactant Aerosol OT (AOT) from C8 to C5 results in a molecule with intermediate properties. Molecular dynamics simulations and surface tension measurements are performed on this short chain derivative of AOT. This compound shows high solubility and at the same time progressive weak aggregation. The hydration of head groups hinders significant plunging into a hydrophobic core, which leads to well defined liquid chain nanodomains. The transition to bicontinuous aggregates is in the concentration range of 1 mol L-1. The sulfonate group of the head groups (placed at the water interface of worm-like aggregates) rather than the aggregate-aggregate interaction is responsible for the unusual small angle X-ray scattering pattern.
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Affiliation(s)
- Simon Stemplinger
- ICSM, CEA, CNRS, Univ Montpellier, ENSCM, Marcoule, France.,Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Regensburg, Germany.
| | - Jérémy Causse
- ICSM, CEA, CNRS, Univ Montpellier, ENSCM, Marcoule, France
| | | | | | - Thomas Zemb
- ICSM, CEA, CNRS, Univ Montpellier, ENSCM, Marcoule, France
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Regensburg, Germany.
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12
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KHALİL R, ALSAMARRAİ L. The Role of the Presence of Aliphatic Alcohols on the Formation of Wormlike Micelle of Anionic-Cationic Surfactants Mixture. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2022. [DOI: 10.18596/jotcsa.961212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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13
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Suleiman Alsalhi M, Andrew Chan K. Amino Acid Hydrotropes to Increase the Solubility of Indomethacin and Carbamazepine in Aqueous Solution. Int J Pharm 2022; 617:121591. [DOI: 10.1016/j.ijpharm.2022.121591] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/11/2022] [Accepted: 02/12/2022] [Indexed: 01/03/2023]
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14
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Nguyen CV, Peng M, Duignan TT, Nguyen AV. Salting-Up of Surfactants at the Surface of Saline Water as Detected by Tensiometry and SFG and Supported by Molecular Dynamics Simulation. J Phys Chem B 2022; 126:1063-1075. [PMID: 35103476 DOI: 10.1021/acs.jpcb.1c08114] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Surfactant adsorption at the air-water interface is critical to many industrial processes but its dependence on salt ions is still poorly understood. Here, we investigate the adsorption of sodium dodecanoate onto the air-water interface using model saline waters of Li+ or Cs+ at pH values 8 and 11. Both cations enhance the surfactant adsorption, as expected, but their largest effects on the adsorption also depend on pH. Specifically, surface tension measurements, sum-frequency generation spectroscopy, and microelectrophoresis show that small (hard) Li+ enhances the surfactant adsorption more than large (soft) Cs+ at pH 11. This effect is fully reversed at pH 8. We argue that this salting-up (increasing adsorption) reversal is attributable to the conversion of the neutralized carboxylic (-COOH) headgroup at pH 8 into the charged carboxylate (-COO-) headgroup at pH 11, which, respectively, interact with Cs+ and Li+ favorably. Molecular dynamics simulation shows that the affinity of Cs+ to the interface is decreased and eventually overtaken by Li+ as the carboxylic groups are deprotonated. This study highlights the importance of the charge and size of salt ions in selecting surfactants and electrolytes for industrial applications.
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Affiliation(s)
- Cuong V Nguyen
- School of Chemical Engineering and ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals (UQ Node), The University of Queensland, Brisbane, QLD 4072, Australia
| | - Mengsu Peng
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Timothy T Duignan
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Anh V Nguyen
- School of Chemical Engineering and ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals (UQ Node), The University of Queensland, Brisbane, QLD 4072, Australia
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15
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Salt effects on the dilational viscoelasticity of surfactant adsorption layers. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2021.101538] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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16
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The key to surfactant-free microemulsion demulsification: CO2 promotes the transfer of amphiphilic solvent to aqueous phase. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Mehringer J, Navarro JA, Touraud D, Schneuwly S, Kunz W. Phosphorylated resveratrol as a protein aggregation suppressor in vitro and in vivo. RSC Chem Biol 2022; 3:250-260. [PMID: 35360889 PMCID: PMC8826510 DOI: 10.1039/d1cb00220a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 12/26/2021] [Indexed: 01/16/2023] Open
Abstract
The stability of proteins in solution poses a great challenge for both technical applications and molecular biology, including neurodegenerative diseases. In this work, a phosphorylated resveratrol material was examined for its anti-aggregation properties in vitro and in vivo. Here, an anti-fibrillation effect could be measured for amyloid beta and human insulin in vitro and general anti-aggregation properties for crude chicken egg white in solution. Using a drosophila fly model for the overexpression of amyloid beta protein, changes in physiological protein aggregation and improved locomotor abilities could be observed in the presence of dietary phosphorylated resveratrol. Phosphorylated resveratrol can prevent the aggregation of globular and intrinsically disordered proteins in vitro and in vivo.![]()
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Affiliation(s)
- Johannes Mehringer
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Germany
| | | | - Didier Touraud
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Germany
| | | | - Werner Kunz
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Germany
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Cloning, expression, solubilization, and purification of a functionally active recombinant cAMP-dependent protein kinase catalytic subunit-like protein PKAC1 from Trypanosoma equiperdum. Protein Expr Purif 2021; 192:106041. [PMID: 34953978 DOI: 10.1016/j.pep.2021.106041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 12/12/2021] [Accepted: 12/20/2021] [Indexed: 11/22/2022]
Abstract
The gene encoding the cAMP-dependent protein kinase (PKA) catalytic subunit-like protein PKAC1 from the Venezuelan TeAp-N/D1 strain of Trypanosoma equiperdum was cloned, and the recombinant TeqPKAC1 protein was overexpressed in bacteria. A major polypeptide with an apparent molecular mass of ∼38 kDa was detected by SDS-polyacrylamide gel electrophoresis, and immunoblotting using antibodies against the human PKA catalytic subunit α. Unfortunately, most of the expressed TeqPKAC1 was highly insoluble. Polypeptides of 36-38 kDa and 45-50 kDa were predominantly seen by immunoblotting in the bacterial particulate and cytosolic fractions, respectively. Since the incorporation of either 4% Triton X-100 or 3% sarkosyl or a mixture of 10 mM MgCl2 and 1 mM ATP (MgATP) improved the solubilization of TeqPKAC1, we used a combination of Triton X-100, sarkosyl and MgATP to solubilize the recombinant protein. TeqPKAC1 was purified by first reconstituting a hybrid holoenzyme between the recombinant protein and a mammalian poly-His-tagged PKA regulatory subunit that was immobilized on a Ni2+-chelating affinity resin, and then by eluting TeqPKAC1 using cAMP. TeqPKAC1 was functional given that it was capable of phosphorylating PKA catalytic subunit substrates, such as kemptide (LRRASLG), histone type II-AS, and the peptide SP20 (TTYADFIASGRTGRRNSIHD), and was inhibited by the peptide IP20 (TTYADFIASGRTGRRNAIHD), which contains the inhibitory motif of the PKA-specific heat-stable inhibitor PKI-α. Optimal enzymatic activity was obtained at 37 °C and pH 8.0-9.0; and the order of effectiveness of nucleotide triphosphates and divalent cations was ATP » GTP ≅ ITP and Mg2+ ≅ Mn2+ ≅ Fe2+ » Ca2+ ≅ Zn2, respectively.
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Zhu J, Chen L, Cai C. Acid Hydrotropic Fractionation of Lignocelluloses for Sustainable Biorefinery: Advantages, Opportunities, and Research Needs. CHEMSUSCHEM 2021; 14:3031-3046. [PMID: 34033701 DOI: 10.1002/cssc.202100915] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/24/2021] [Indexed: 06/12/2023]
Abstract
This Minireview provides a comprehensive discussion on the potential of using acid hydrotropes for sustainably fractionating lignocelluloses for biorefinery applications. Acid hydrotropes are a class of acids that have hydrotrope properties toward lignin, which helps to solubilize lignin in aqueous systems. With the capability of cleaving ether and ester bonds and even lignin-carbohydrate complex (LCC) linkages, these acid hydrotropes can therefore isolate lignin embedded in the plant biomass cell wall and subsequently solubilize the isolated lignin in aqueous systems. Performances of two acid hydrotropes, that is, an aromatic sulfonic acid [p-toluenesulfonic acid (p-TsOH)] and a dicarboxylic acid [maleic acid (MA)], in terms of delignification and dissolution of hemicelluloses, and reducing lignin condensation, were evaluated and compared. The advantages of lignin esterification by MA for producing cellulosic sugars through enzymatic hydrolysis and lignin-containing cellulose nanofibrils (LCNFs) through mechanical fibrillation from the fractionated water insoluble solids (WIS), and for obtaining less condensed lignin with light color, were demonstrated. The excellent enzymatic digestibility of maleic acid hydrotropic fractionation WISs was also demonstrated by comparing with WISs from other fractionation processes. The recyclability and reusability of acid hydrotropes were also reviewed. Finally, perspectives on future research needs to address key technical issues for commercialization were also provided.
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Affiliation(s)
- Junyong Zhu
- USDA Forest Service, Forest Products Laboratory, Madison, WI, USA
| | - Liheng Chen
- Department of Biomedical Engineering, Jinan University, Guangzhou, P. R. China
| | - Cheng Cai
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
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Mehringer J, Kunz W. Carl Neuberg's hydrotropic appearances (1916). Adv Colloid Interface Sci 2021; 294:102476. [PMID: 34229180 DOI: 10.1016/j.cis.2021.102476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/25/2021] [Accepted: 06/27/2021] [Indexed: 10/21/2022]
Abstract
In his 1916 land-mark paper "Hydrotropic appearances", Carl Neuberg coined the term "hydrotropy", referring to the solubilisation effect of hydrophobic molecules by small, amphiphilic compounds. In this voluminous work he examines 43 different compounds for their hydrotropic effect and touches on many aspects that later became relevant to hydrotrope science (e.g. applications in pharma, green chemistry, pre-ouzo effect, etc.). Given the significance of his work, it is still widely cited today. However, poor availability and a potential language barrier will severely limit the accessibility for international researchers. Therefore, this translation into the English language seeks to provide access to both, his original thoughts as well as his prolific experimental work on this topic.
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Mavliutova L, Verduci E, Sellergren B. Combinatorial design of a sialic acid imprinted binding site exploring a dual ion receptor approach. RSC Adv 2021; 11:34329-34337. [PMID: 35497298 PMCID: PMC9042400 DOI: 10.1039/d1ra06962d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 10/15/2021] [Indexed: 11/21/2022] Open
Abstract
Dual-ion imprinting of sialic acid via cooperatively acting ureido- and crown ether functionalities leads to charge neutral sialic acid receptors with strong sialoglycopeptide affinity.
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Affiliation(s)
- Liliia Mavliutova
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, SE-20506 Malmö, Sweden
| | - Elena Verduci
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, SE-20506 Malmö, Sweden
| | - Börje Sellergren
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, SE-20506 Malmö, Sweden
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