Retraction note: ROS-mediated cytotoxic activity of ZnO and CeO2 nanoparticles synthesized using the Rubia cordifolia L. leaf extract on MG-63 human osteosarcoma cell lines (Environmental Science and Pollution Research, (2018), 25, 11, (10482-10492), 10.1007/s11356-017-0003-5)

This article has been retracted by the Editor-in-Chief and the Publisher. After publication, an image integrity concern was raised regarding the images presented in Figure 11, specifically that regions of the red channel data appear to have been duplicated between Figures 11b and 11c. The authors have not provided a satisfactory response to this. In addition, further investigation raised concerns about Figure 10, which appears to show multiple identical values across the treatment groups. The authors have not provided satisfactory raw data to alleviate the concerns. Based on this, the Editor-in-Chief no longer has confidence in the results and conclusions of this article. Author Natarajan Sisubalan disagrees with this retraction. Authors Vijayan Sri Ramkumar, Arivalagan Pugazhendhi, Chandrasekaran Karthikeyan, Karuppusamy Indira, Kasi Gopinath, Abdulrahman Syedahamed Haja Hameed and Mohamed Hussain Ghouse Basha have not responded to correspondence regarding this retraction.