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. 2016 Jul 13;16(7):1082. doi: 10.3390/s16071082

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Hourly changes of occurrences and average intensity of carotenoid Raman signals resulted from C–C stretching and C=C stretching. (O_C–C, the occurrences of C–C stretching mode; O_C=C, the occurrences of C=C stretching mode; I_C–_C, the average intensity of C–C stretching mode of an hour; I_C=C, the average intensity of C=C stretching mode of an hour). Blue and green histogram signify the occurrences detection of C–C stretching at 1157 cm⁻¹ and C=C stretching mode of β-carotene at 1527 cm⁻¹ (detection 12 times per hour), respectively. Orange lines and violet points represent average intensity of one hour of all above carotenoids.