Comments on the paper "Synthesis, structural and optical properties, ferromagnetic behaviour, cytotoxicity and NLO activity of lithium sulphate doped L-threonine"

Abstract

The authors of the title paper (Optics and Laser Technology 83 (2016) 49-54) claim to have grown a 'lithium sulphate doped L-threonine' crystal by slow evaporation of an aqueous solution containing equimolar amounts of L-threonine and lithium sulphate. A reinvestigation of the crystal growth reaction reveals that fractional crystallization of L-threonine occurs. In this letter to the Editor, we prove that the so-called lithium sulphate doped L-threonine is a dubious crystal and not a ferromagnetic material.