Fig. 3From: Fabrication and vibration characterization of curcumin extracted from turmeric (Curcuma longa) rhizomes of the northern VietnamRaman spectra comparison of commercial curcumin samples being sold on the Vietnamese market and fabricated (Cur N1) sample (a), and a section of the spectra in the frequency range from 1550 to 1650 cm−1 is zoomed in for easy observation of differences at 959 and 1625 cm−1 for each different sample, plus samples N12, N13 (b)Back to article page