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Updated: May 3, 2026

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics
Published on: October 19, 2018
Studies on the isolation and purification of chloroplasts from Euglena gracilis
J F Preston1, F Parenti, J M Eisenstadt
1Department of Microbiology, Yale University School of Medicine, New Haven, Connecticut, USA.
Abstract:
A method has been developed for the isolation of chloroplasts from Euglena gracilis grown under mixotrophic conditions. This method utilizes sucrose density-gradient centrifugation in the AXII zonal rotor and allows the rapid preparation of large amounts of chloroplasts free from contaminating whole cells and other cytoplasmic materials. The majority of the isolated chloroplasts appear intact in phase contrast and electron micrographs. The purified chloroplast fraction contains DNA, the major species of which has a density of 1.682 g/cm(3). The species of DNA having a density of 1.707 g/cm(3) seemed to result from the presence of contaminating nuclear fragments which could be removed by isopycnic flotation.
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