Water gelation of an amino acid-based amphiphile

Chemistry : a European Journal
Debapratim DasPrasanta Kumar Das

Abstract

The water immobilization by a simple amino acid-containing cationic surfactant was investigated. A variety of techniques, such as (1)H NMR spectroscopy, circular dichroism (CD), steady-state fluorescence spectroscopy, and field-emission scanning electron microscopy (FESEM) were applied to determine the formation and architecture of the hydrogel. The new gelator with a minimum gelation concentration (MGC) of 0.3 % w/v shows prolonged stability and a low melting temperature (39 degrees C). (1)H NMR experiments revealed that intermolecular hydrogen bonding between the amide groups and pi-pi stacking of the indole rings are the two regulating parameters for gelation. Furthermore, fluorescence studies with 8-anilino-1-naphthalenesulfonic acid (ANS) as the probe indicate the participation of hydrophobicity during gelation. The luminescence study using both ANS and pyrene, along with FESEM results, indicate a critical concentration, well below the MGC, at which fibres begin to form. These cross-link further to give thicker fibers, leading to the formation of a hydrogel (0.3 % w/v). This new hydrogelator expresses high supramolecular chirality, as evidenced by the CD spectra. In addition, the gelator molecule was found to be nontoxic u...Continue Reading

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Citations

May 12, 2010·Protein Engineering, Design & Selection : PEDS·Hoang D LuScott Banta
Mar 6, 2008·Biotechnology and Bioengineering·Sangita Roy, Prasanta Kumar Das
Jul 8, 2016·The Journal of Organic Chemistry·Alba Pereira-VilarLuis García-Río
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Oct 9, 2018·Macromolecular Bioscience·Jiaul HoqueShyni Varghese
Jul 22, 2008·Chemistry : a European Journal·Sisir DebnathPrasanta Kumar Das
Nov 12, 2009·Chemical Communications : Chem Comm·Amrita PalJoykrishna Dey
Oct 12, 2010·Chemical Communications : Chem Comm·Sayanti BrahmachariPrasanta Kumar Das
Dec 17, 2008·Organic & Biomolecular Chemistry·Rajendra Narayan MitraPrasanta Kumar Das
May 30, 2019·Chemical Communications : Chem Comm·Mohammad AzharuddinHirak K Patra
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Nov 19, 2010·Beilstein Journal of Organic Chemistry·Sayanti BrahmachariPrasanta Kumar Das
Jan 29, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Anshupriya ShomePrasanta K Das
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Mar 8, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Anshupriya ShomePrasanta Kumar Das
Mar 20, 2010·The Journal of Physical Chemistry. B·Sisir DebnathPrasanta Kumar Das
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Jun 2, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Nami MinakuchiTatsuo Maruyama

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