Retraction: The following article from the Journal of Chemical Technology and Biotechnology, Efficient separation of Nannochloropsis salina using minerals to optimize algae sedimentation by Razi Epsztein, Amichai Felder, Alex Mishelevitz and Vitaly Gitis, published online on 20 March, 2012 in WileyOnlineLibrary (; doi: 10.1002/jctb.3754), has been retracted by agreement between the authors, the journal Editor in Chief, Jack Melling and John Wiley & Sons. The retraction has been agreed following an investigation by the academic ethics code committee of Ben-Gurion University which decided that the corresponding author had no right to publish the results of the study without permission from the other authors (decision from 21 June 2012).