Retraction Note to: Appl Microbiol Biotechnol (2015) 99:9473–9481

DOI 10.1007/s00253-015-6717-8

This article "Enhancement of the catalytic activity of ferulic acid decarboxylase from Enterobacter sp. Px6-4 through random and site-directed mutagenesis"published in Volume 99, Issue 22, pages 9473–9481; DOI 10.1007/s00253-015-6717-8 has been retracted at the request of the authors.

The corresponding author, Hor-Gil Hur, reported to the Editor-in-Chief that the authors of this manuscript have raised concerns related to the accuracy of the data presented in this article. The authors determined that the enzyme activity data from the experiments performed by the authors are not consistent when tested repeatedly and the mutant does not show 34 fold higher catalytic activity compared to wild type which was the major claim in this manuscript. This is the major reason for the retraction of the manuscript. However, the authors did not find out the exact reason why it does not show reproducible data. It may be miscalculation or wrong interpretation of the data. The authors apologize to the readers of Applied Microbiology and Biotechnology for any inconvenience caused by this retraction.