Retraction of ‘Fabrication of divalent ion substituted hydroxyapatite/gelatin nanocomposite coating on electron beam treated titanium: mechanical, anticorrosive, antibacterial and bioactive evaluations’ by A. Karthika et al., RSC Adv., 2015, 5, 47341–47352, http://doi.org/10.1039/C5RA05624A.