Reinvestigation of growth of ‘l-valine zinc sulphate’ crystal

•Growth of l-valine zinc sulphate crystal is reinvestigated.•Earlier reported l-valine zinc sulphate crystal is actually l-valine.•ZnSO4⋅7H2O does not show any chemical reaction towards l-valine.•ZnSO4⋅7H2O does not inhibit crystal growth of l-Valine.

A reinvestigation of the growth of l-valine zinc sulphate crystal is reported. The slow evaporation of an aqueous solution containing l-valine and zinc sulphate heptahydrate results in the fractional crystallization of l-valine and not the organic inorganic hybrid nonlinear optical l-valine zinc sulphate crystal, as reported by Puhal Raj and Ramachandra Raja (2012).

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