The FTIR spectra of pure OLM and OLM-loaded NSs (ONS1-ONS4) were recorded using FTIR spectrometer (Jasco FTIR Spectrophotometer, Tokyo, Japan). Each samples were diluted with crystalline potassium bromide (sample:KBr, 1:10 wt/wt), and pressed into transparent film. The film was kept on sample holder and spectra was recorded using spectra manager software [37 (link)].
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