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2-D gel densitometer for high-contrast and selective imaging of chlorophyll-containing protein complexes separated by non-denaturing polyacrylamide gel electrophoresis.

Authors
  • Ilík, Petr
  • Krchnák, Pavel
  • Tomek, Pavel
  • Naus, Jan
Type
Published Article
Journal
Journal of Biochemical and Biophysical Methods
Publisher
Elsevier
Publication Date
May 31, 2002
Volume
51
Issue
3
Pages
273–281
Identifiers
PMID: 12088887
Source
Medline
License
Unknown

Abstract

In this work, we present a home-made two-dimensional (2-D) CCD imaging system for the monochromatic densitometry of plane gels and its application to the imaging and densitometry of chlorophyll (Chl)-containing proteins separated by non-denaturing polyacrylamide gel electrophoresis. The monochromatic imaging of separated green bands at the wavelengths corresponding to their absorption band increases their contrast. This allows a better visualization of the faint-green bands in the gel and using of samples with lower Chl content for the electrophoresis. By the comparison of 2-D densitograms of the same gel illuminated with 670 and 650 nm lights, that is, at the red absorption maximum of Chl a and b, respectively, we achieved a selective imaging of the complexes with different Chl a/b ratio. This approach was used to specify an unknown band that appeared in the gel of the sample prepared from the thylakoid membranes of preheated barley leaves.

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