Reversed micelles as novel protein refolding media

Masahiro Goto, Tsutomu Ono, Shintaro Furusaki

Research output: Contribution to journalArticlepeer-review


Refolding of denatured RNase A was conducted by a nanostructural surfactant-based molecular assembly formulated with sodium di-2-ethylhexyl sulfosuccinate (AOT) in isooctane. In the novel refolding technique, a solid-liquid extraction was utilized as an alternative to the ordinary protein extraction by reversed micelles based on a liquid-liquid extraction. The effects of operational parameters such as concentration of AOT, Wo (=[H2O]/[AOT]), and pH were examined on the solubilization of denatured proteins into a reversed micellar solution. The typically denatured form of the protein being isolated is reactivated due to its refolding ability within the confines of the reversed micelle medium. A complete renaturation of RNase A was accomplished by adjusting the composition of the redox reagent even at a high protein concentration in which protein aggregation would usually occur in aqueous media. In the final step, the renatured RNase A was effectively recovered from the reversed micellar solution without the loss of the enzymatic activity.

Original languageEnglish
Pages (from-to)374-383
Number of pages10
JournalACS Symposium Series
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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