Characterization and deposition of various light-harvesting antenna complexes by electrospray atomization

Vivek B. Shah, Gregory S. Orf, Sean Reisch, Lucas B. Harrington, Mindy Prado, Robert E. Blankenship, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Photosynthetic organisms have light-harvesting complexes that absorb and transfer energy efficiently to reaction centers. Light-harvesting complexes (LHCs) have received increased attention in order to understand the natural photosynthetic process and also to utilize their unique properties in fabricating efficient artificial and bio-hybrid devices to capture solar energy. In this work, LHCs with different architectures, sizes, and absorption spectra, such as chlorosomes, Fenna-Matthews-Olson (FMO) protein, LH2 complex, and phycobilisome have been characterized by an electrospray-scanning mobility particle-sizer system (ESSMPS). The size measured by ES-SMPS for FMO, chlorosomes, LH2, and phycobilisome were 6.4, 23.3, 9.5, and 33.4 nm, respectively. These size measurements were compared with values measured by dynamic light scattering and those reported in the literature. These complexes were deposited onto a transparent substrate by electrospray deposition. Absorption and fluorescence spectra of the deposited LHCs were measured. It was observed that the LHCs have light absorption and fluorescence spectra similar to that in solution, demonstrating the viability of the process.

Original languageEnglish (US)
Pages (from-to)2329-2338
Number of pages10
JournalAnalytical and bioanalytical chemistry
Volume404
Issue number8
DOIs
StatePublished - Nov 2012
Externally publishedYes

Keywords

  • Electrospray deposition
  • Electrospray-scanning mobility particle sizer (ES-SMPS)
  • Light-harvesting complexes (LHCs)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry

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