pH-triggered transition of silk fibroin from spherical micelles to nanofibrils in water

Peng Chen, Hyun Suk Kim, Chi Young Park, Hun Sik Kim, In Joo Chin, Hyoung Joon Jin

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Many natural proteins self-assemble in complex ways, either to fulfill their biological function or introduce particular properties, such as high strength and toughness. We report the morphological transition in water from a spherical to rod-like shape of Bombyx mori silk fibroin by reducing the pH. Transmission electron microscopy, scanning electron microscopy, and dynamic light scattering were used to characterize the dilute solutions of silk fibroin in an aqueous environment, and provide direct visualization of the transformation of spherical micelles at pH 6.8 to nanofibrils at pH 4.8. This change in morphology occurred as a result of the stretching entropy due to the formation of β-sheets, which was analyzed using circular dichroism spectroscopy. This study demonstrates the self-assembly of silk fibroin as a function of pH.

Original languageEnglish
Pages (from-to)539-543
Number of pages5
JournalMacromolecular Research
Volume16
Issue number6
DOIs
StatePublished - Aug 2008

Keywords

  • Nanostructures
  • Self-assembly
  • Silk fibroin

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