Comment on “Enhanced bioactivity of Fe3O4-Au nanocomposites – A comparative antibacterial study” by Arockia Jency. D, Sathyavathi. K, Umadevi Mahalingam, Parimaladevi Ramasamy, in Materials Letters 258 (2020) 126795

•Comment on the research article by Arockia Jency. D, et al. Mater. Lett. 258 (2020).•Limitation in structural and optical properties studied.•Discussion on particle size reduction with respect to enhanced bioactivity.•Technical and scientific contents are not accurate to the discussion. We report some comments and views on the research article entitled “Enhanced bioactivity of Fe3O4-Au nanocomposites - A comparative antibacterial study” authored by Arockia Jency. D, Sathyavathi. K, Umadevi Mahalingam, Parimaladevi Ramasamy, published in Materials Letters 258 (2020) 126795, which deals with some inaccuracies, scientific mistakes, and errors, even in microstructural and optical analysis.