“…3 A represents FT-IR spectra of NBV, Span, labrasol, their PM, and the selected SNVs either plain or medicated. NBV spectrum showed two well-defined sharp bands at 3195 cm −1 , representing the stretching vibration of the hydroxyl group, at 2848, 2920, and 2985 cm −1 due to the C—H stretching, at 1622 cm −1 , 1564 cm −1 due to C C stretching, 1303 due to C—N stretching and at 1140 cm −1 due to C—O stretching ( Vijayanand et al, 2016 ). As shown in this Figure, Labrasol exhibited a C—H stretching band at 2924 and 2870 cm −1 , C O stretching at 1736 cm −1 , and broad peaks at 1108 due to C—O stretching ( Karataş and Bekmezci, 2013 ).…”