ATR-FTIR spectra of curcumin, chitosan, ethyl cellulose, nanoparticles, and patches were examined using the ATR-FTIR spectrometer (PerkinElmer, 940 Winter St Waltham, MA, United States). The samples were placed on the sample holder without any processing and scanned between 4000 and 400 cm−1. Spectra were recorded in triplicates and results were averaged [17 (link)].
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