Novel Chiroptical Analysis of Hemoglobin by Surface Enhanced Resonance Raman Optical Activity Spectroscopy

Nadezda Brazhe, Alexey Brazhe, Olga Sosnovtseva, Salim Abdali

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The metalloprotein hemoglobin (Hb) was studied using surface enhanced resonance Raman spectroscopy (SERRS) and surface enhanced resonance Raman optical activity (SERROA). The SERROA results are analyzed and compared with the SERRS, and the later to the resonance Raman (RRS) performed on Hb. The SERRS measurements careful optimization, with respect to the concentration and volume ratio of the analyte to colloids, enables for the first time SERROA of this molecule. We observed that the most intense SERROA signals were attributed the v(4), v(20), and v(21) vibrations, which are sensitive to the redox state of the heme's iron ion, and to the presence of its sixth site, bound to exogenous ligand; O-2, NO or CO. However, in this study, the SERROA signals corresponding to these vibrations appear more sensitive to the Hb oxygen-binding properties than they appear in the SERRS or RRS. Moreover, the SERROA signal of Hb has successfully been monitored as a function of time, and was observed to be stable for 4-5 min. To our knowledge, the SERROA results of Hb, and its comparison to SERRS and RRS, are here reported for the first time. Chirality 21:E307-E312, 2009.
Original languageEnglish
JournalChirality
Volume21
Issue number1E
Pages (from-to)E307-E312
ISSN0899-0042
DOIs
Publication statusPublished - 2010

Keywords

  • SEROA/SERROA
  • hemoglobin
  • chirality
  • SERS/SERRS
  • resonance raman spectroscopy

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