Amino Acids at Water−Vapor Interfaces: Surface Activity and Orientational Ordering

2010 ◽  
Vol 114 (40) ◽  
pp. 13005-13010 ◽  
Author(s):  
Esteban Vöhringer-Martinez ◽  
Alejandro Toro-Labbé
Keyword(s):  
Amino Acids ◽  
Water Vapor ◽  
Surface Activity ◽  
Orientational Ordering

scholarly journals The Relationship between the Structure and Properties of Amino Acid Ionic Liquids

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3252 ◽  
Author(s):  
Paula Ossowicz ◽  
Joanna Klebeko ◽  
Barbara Roman ◽  
Ewa Janus ◽  
Zbigniew Rozwadowski
Keyword(s):  
Amino Acids ◽  
Ionic Liquids ◽  
Amino Acid ◽  
Surface Activity ◽  
Spectroscopic Properties ◽  
Specific Rotation ◽  
Structure And Properties ◽  
Rotation Surface ◽  
Cation Type ◽  
The Relationship

Ionic liquids based on different l-amino acids (glycine, l-valine, l-leucine, l-isoleucine, l-histidine, l-methionine, l-tyrosine, l-tryptophan, l-arginine, and l-threonine) and different cations (tetrabutylammonium (TBA), tributylmethylammonium (tBMA), didecyldimethylammonium (DDA), (2-hydroxyethyl)trimethylammonium (choline) (Chol), alkyl(C12-C14) dimethylbenzylammonium (benzalkonium) (BA), dodecyltrimethylammonium (DDTMA), hexadecyltrimethylammonium (HDTMA), octadecyltrimethylammonium (ODTMA) and 1-ethyl-3-methylimidazolium (EMIM)) have been synthesized and characterized by NMR and FTIR. Viscosity, specific rotation, surface activity, thermal stability (TG), and phase transformations (DSC) have been determined and compared with available data. Furthermore, benzalkonium, didecyldimethylammonium, dodecyltrimethylammonium, hexadecyltrimethylammonium, and octadecyltrimethylammonium amino acid ionic liquids have been shown to exhibit surface activity. The dissolution of cellulose in amino acid ionic liquids (AAILs) composed of various cations was also investigated. Cellulose was only dissolved in EMIM salts of amino acids. In particular, the influence of the cation type on selected physicochemical and spectroscopic properties were discussed. The article is a mini review on amino acid ionic liquids.

The enhancement of surface activity and nanoparticle stability through the alteration of charged amino acids of HGFI

2019 ◽  
Vol 175 ◽  
pp. 703-712 ◽  
Author(s):  
Jiuxia Yang ◽  
Bo Wang ◽  
Lu Ge ◽  
Xiaotian Yang ◽  
Xiangxiang Wang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Surface Activity ◽  
Nanoparticle Stability ◽  
Charged Amino Acids

Redox characteristics of amino acids using low pressure water vapor RF plasma

2010 ◽  
Author(s):  
Y Akiyoshi ◽  
A Nakahigashi ◽  
N Hayashi ◽  
S Kitazaki ◽  
T Iwao ◽  
...  
Keyword(s):  
Amino Acids ◽  
Water Vapor ◽  
Low Pressure ◽  
Rf Plasma ◽  
Pressure Water

scholarly journals Surface Modifications Created by Using Engineered Hydrophobins

2002 ◽  
Vol 68 (3) ◽  
pp. 1367-1373 ◽  
Author(s):  
Karin Scholtmeijer ◽  
Meike I. Janssen ◽  
Bertus Gerssen ◽  
Marcel L. de Vocht ◽  
Babs M. van Leeuwen ◽  
...  
Keyword(s):  
Amino Acids ◽  
Surface Activity ◽  
Self Assembly ◽  
Surface Modifications ◽  
Cell Binding ◽  
Physiochemical Properties ◽  
Pattern Class ◽  
Hydrophilic Surfaces ◽  
N Terminus ◽  
Cell Binding Domain

ABSTRACT Hydrophobins are small (ca. 100 amino acids) secreted fungal proteins that are characterized by the presence of eight conserved cysteine residues and by a typical hydropathy pattern. Class I hydrophobins self-assemble at hydrophilic-hydrophobic interfaces into highly insoluble amphipathic membranes, thereby changing the nature of surfaces. Hydrophobic surfaces become hydrophilic, while hydrophilic surfaces become hydrophobic. To see whether surface properties of assembled hydrophobins can be changed, 25 N-terminal residues of the mature SC3 hydrophobin were deleted (TrSC3). In addition, the cell-binding domain of fibronectin (RGD) was fused to the N terminus of mature SC3 (RGD-SC3) and TrSC3 (RGD-TrSC3). Self-assembly and surface activity were not affected by these modifications. However, physiochemical properties at the hydrophilic side of the assembled hydrophobin did change. This was demonstrated by a change in wettability and by enhanced growth of fibroblasts on Teflon-coated with RGD-SC3, TrSC3, or RGD-TrSC3 compared to bare Teflon or Teflon coated with SC3. Thus, engineered hydrophobins can be used to functionalize surfaces.

scholarly journals Hygroscopic larval provisions of bees absorb soil water vapor and release liquefied nutrients

Apidologie ◽  
2021 ◽  
Author(s):  
James H. Cane ◽  
Byron G. Love
Keyword(s):  
Amino Acids ◽  
Water Vapor ◽  
Free Water ◽  
Past Research ◽  
Larval Stages ◽  
Cavity Nesting ◽  
Hygroscopic Nature ◽  
Remarkable Result ◽  
Nectar Sugar ◽  
Ground Nesting

AbstractLarvae of most bee species consume individual provision masses composed of pollen mixed with nectar. For simple metabolic reasons, mature larvae should weigh less than their consumed provision. However, past research reported a remarkable result: mature larvae of three ground-nesting halictid bees weighed 60% more than their original provision masses. This surprising paradox could result from the expected hygroscopic nature of nectar. Sugar solutions absorb water vapor at rates defined by their osmolarity and ambient humidity. Our experiments tested this hypothesis, showing that larval provisions of a ground-nesting bee, Nomia melanderi, are strongly hygroscopic. They consequently absorbed substantial water vapor from this bee’s preferred nesting soil. Mature larvae weighed 65% more than their original provision because hygroscopy had greatly augmented available dietary water. Liquid accumulating around isolated provisions was a sweet nutritious broth that included amino acids leached from the pollen. Hygroscopy was most intense during the egg and early larval stages. However, provision liquefaction (and possible drowning) was partly offset by rapid hydration of cached pollen, whose weight could double after absorbing free water. Larval provisions of two cavity-nesting Osmia species also readily absorbed water vapor from a soil atmosphere. However, at humidities measured within tunnels of their natural deadwood nesting substrates, they gained little weight via hygroscopy. Consequently, their mature larvae weighed less, not more, than the provision that they ate. These new insights explain some nesting traits shared by many ground-nesting bees, such as why females do not waterproof the earthen cell caps of their nest cells, or why many colletids cache liquid provisions. Progressive hygroscopy and resulting sugar dilution may also mediate succession of microbial mutualists and pathogens in provision masses of ground-nesting bees.

Homochirality as the Signature of Extra-Terrestrial Life

1997 ◽  
Vol 161 ◽  
pp. 505-510
Author(s):  
Alexandra J. MacDermott ◽  
Laurence D. Barron ◽  
Andrè Brack ◽  
Thomas Buhse ◽  
John R. Cronin ◽  
...  
Keyword(s):  
Amino Acids ◽  
Protein Synthesis ◽  
Optical Rotation ◽  
Physical Origin ◽  
Natural Choice ◽  
Rosetta Mission ◽  
Terrestrial Life ◽  
Subsurface Layers ◽  
Solar System Bodies ◽  
Origin Of Homochirality

AbstractThe most characteristic hallmark of life is its homochirality: all biomolecules are usually of one hand, e.g. on Earth life uses only L-amino acids for protein synthesis and not their D mirror images. We therefore suggest that a search for extra-terrestrial life can be approached as a Search for Extra- Terrestrial Homochirality (SETH). The natural choice for a SETH instrument is optical rotation, and we describe a novel miniaturized space polarimeter, called the SETH Cigar, which could be used to detect optical rotation as the homochiral signature of life on other planets. Moving parts are avoided by replacing the normal rotating polarizer by multiple fixed polarizers at different angles as in the eye of the bee. We believe that homochirality may be found in the subsurface layers on Mars as a relic of extinct life, and on other solar system bodies as a sign of advanced pre-biotic chemistry. We discuss the chiral GC-MS planned for the Roland lander of the Rosetta mission to a comet and conclude with theories of the physical origin of homochirality.

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