Journal of Materials Science

, Volume 47, Issue 4, pp 1825–1835 | Cite as

Nano structures through self-assembly of protected hydrophobic amino acids: encapsulation of rhodamine B dye by proline-based nanovesicles

  • Sudeshna Kar
  • Michael G. B. Drew
  • Animesh Pramanik
Article

Abstract

The development of novel molecules for the creation of nanometer structures with specific properties has been the current interest of this research. We have developed a set of molecules from hydrophobic ω- and α-amino acids by protecting the –NH2 with Boc (t-butyloxycarbonyl) group and –CO2H with para-nitroanilide such as BocHN–Xx–CONH–(p–NO2)·C6H4, where Xx is γ-aminobutyric acid (γ-Abu), (l)-isoleucine, α-aminoisobutyric acid, proline, etc. These molecules generate various nanometer structures, such as nanofibrils, nanotubes and nanovesicles, in methanol/water through the self-assembly of bilayers in which the nitro benzene moieties are stacked in the middle and the Boc-protected amino acids parts are packed in the outer surface. The bilayers can be further stacked one over the other through hydrophobic interactions to form multilayer structure, which helps to generate different kinds of nanoscopic structures. The formation of the nanostructures has been facilitated through the participation of various noncovalent interactions, such as hydrophobic interactions, hydrogen bonding and aromatic π-stacking interactions. Fluorescence microscopy and UV studies reveal that the nanovesicles generated from pro-based molecule can encapsulate dye molecules which can be released by addition of acid (at pH 2). These single amino acid based molecules are both easy to synthesize and cost-effective and therefore offer novel scaffolds for the future design of nanoscale structures.

Supplementary material

10853_2011_5969_MOESM1_ESM.doc (10.3 mb)
Supplementary material 1 (DOC 10568 kb)

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Sudeshna Kar
    • 1
  • Michael G. B. Drew
    • 2
  • Animesh Pramanik
    • 1
  1. 1.Department of ChemistryUniversity of CalcuttaKolkataIndia
  2. 2.School of ChemistryThe University of ReadingReadingUK

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