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. 2016 Jul 22;5(1):1147. doi: 10.1186/s40064-016-2812-2

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — Raman 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)