Lyotropic liquid crystalline phases from helical β-peptides as alignment media.

@article{Thiele2011LyotropicLC,
  title={Lyotropic liquid crystalline phases from helical $\beta$-peptides as alignment media.},
  author={Christina Marie Thiele and William C. K. Pomerantz and Nicholas L. Abbott and Samuel H. Gellman},
  journal={Chemical communications},
  year={2011},
  volume={47 1},
  pages={
          502-4
        }
}
Lyotropic liquid crystalline (LLC) phases from helical β-peptides are proposed as novel water-based alignment media. In contrast to α-peptides, β-peptides form LLCs at very short chain lengths and at concentrations as low as 1 percent. Spectra obtained in these LLC phases are artefact-free and lead to RDCs of the desired size. First indications towards enantiodiscrimination are provided. 
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References

SHOWING 1-10 OF 28 REFERENCES
Lyotropic Liquid Crystals from Designed Helical β-Peptides
We demonstrate that 14-helical β-peptides can self-assemble to form lyotropic liquid crystalline (LC) phases in water. β-Peptides 1−4 were designed to form globally amphiphilic 14-helices of
Nanofibers and lyotropic liquid crystals from a class of self-assembling beta-peptides.
TLDR
A class of oligomers that, like the chromonic molecules, are not globally amphiphilic but nevertheless form LC phases in water are described, which allows rational and systematic modification of lipophilic or hydrophilic components, which enables us to define key features that are required for LC formation.
Polypeptide Liquid Crystals: A Deuterium NMR Study
Abstract In polypeptide liquid crystals deuterium NMR spectra of labeled guest molecules and labeled Polybenzylglutamate exhibit a characteristic doubling (anisochronism) of the quadrupolar
How different are diastereomorphous orientations of enantiomers in the liquid crystalline phases of PBLG and PBDG: a case study
The orientational properties of the two enantiomers of an example compound, namely isopinocampheol [(+)‐ and (−)‐IPC] in the two enantiomers of a liquid crystalline phase, namely
Recent Results in the Field of Liquid Crystals
Thermotropic mesomorphous phases such as occur in the melts of many organic substances are considered. Though mesomorphous melts were first observed by Reinitzer in 1888, fundamental structural
Direct measurement of distances and angles in biomolecules by NMR in a dilute liquid crystalline medium.
TLDR
The approach promises to improve the accuracy of structures determined by NMR, and extend the size limit, and distances and angles derived from dipolar couplings in human ubiquitin are in excellent agreement with its crystal structure.
A rationally designed aldolase foldamer.
TLDR
Current strategies for creating enzyme-like catalysts range from rational and computational design to evolutionary searches of large molecular libraries and sequence-specific polymers, which have the potential to display properties akin to those of proteins.
Orientational properties of poly-gamma-benzyl-L-glutamate: influence of molecular weight and solvent on order parameters of the solute.
TLDR
This systematic investigation into modulating the orientation induced by one chiral orienting medium, namely organic solutions of PBLG (poly-gamma-benzyl-L-glutamate), as a function of its molecular weight and the organic co-solvent used, gets significant insights into factors that influence the order induced.
...
1
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3
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