A small-angle neutron scattering study on the small aggregates of bacteriochlorophylls in solutions

Zheng Yu Wang, Mitsuo Umetsu, Kenji Yoza, Masayuki Kobayashi, Masayuki Imai, Yushu Matsushita, Nobuo Niimura, Tsunenori Nozawa

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Small-angle neutron scattering measurements have been made to determine the size of small aggregates of bacteriochlorophyll chlorophyll (BChl) a and c formed in non-polar solution. Both BChl a and c form dimers and oligomers in equilibrium with each other at high concentrations in benzene-d6 solutions. The size and molecular weight for each dimer have been quantitatively evaluated based on Guinier approximation. The radii of gyration of the dimers are determined to be 17.0 ± 0.5 A and 16.5 ± 0.5 W for the BChl a and c, respectively. Limited observations in the very small angle region suggest that the oligomers are of considerable dimension, approximately as large as a hundred angstroms for the radius of gyration. The SANS results can be well correlated with the electronic absorption and NMR spectra and are in good agreement with other spectroscopic behavior of the small aggregates reported previously.

Original languageEnglish
Pages (from-to)73-82
Number of pages10
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1320
Issue number1
DOIs
Publication statusPublished - 1997 May 16

Keywords

  • Antenna
  • Chlorosome
  • Green bacterium
  • Pigment aggregation
  • Radius of gyration
  • Small-angle neutron scattering

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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