title: Toward food analytics: fast estimation of lycopene and β-carotene content in tomatoes based on surface enhanced Raman spectroscopy (SERS).
abstract: Carotenoids are molecules that play important roles in both plant development and in the well-being of mammalian organisms. Therefore, various studies have been performed to characterize carotenoids' properties, distribution in nature and their health benefits upon ingestion. Nevertheless, there is a gap regarding a fast detection of them at the plant phase. Within this contribution we report the results obtained regarding the application of surface enhanced Raman spectroscopy (SERS) toward the differentiation of two carotenoid molecules (namely, lycopene and β-carotene) in tomato samples. To this end, an e-beam lithography (EBL) SERS-active substrate and a 488 nm excitation source were employed, and a relevant simulated matrix was prepared (by mixing the two carotenoids in defined percentages) and measured. Next, carotenoids were extracted from tomato plants and measured as well. Finally, a combination of principal component analysis and partial least squares regression (PCA-PLSR) was applied to process the data, and the obtained results were compared with HPLC measurements of the same extracts. A good agreement was obtained between the HPLC and the SERS results for most of the tomato samples.
authors.affiliation: Friedrich Schiller University Jena, Institute of Physical Chemistry and Abbe Center of Photonics, Helmholtzweg 4, 07745 Jena, Germany.
authors.forename: Andreea Ioana
authors.initials: AI
authors.lastname: Radu
authors.forename: Oleg
authors.initials: O
authors.lastname: Ryabchykov
authors.forename: Thomas Wilhelm
authors.initials: TW
authors.lastname: Bocklitz
authors.forename: Uwe
authors.initials: U
authors.lastname: Huebner
authors.forename: Karina
authors.initials: K
authors.lastname: Weber
authors.forename: Dana
authors.initials: D
authors.lastname: Cialla-May
authors.forename: Jürgen
authors.initials: J
authors.lastname: Popp
mesh_terms: D002338:Carotenoids / Q000032:analysis*; D005504:Food Analysis / Q000379:methods*; D000077276:Lycopene; D018551:Solanum lycopersicum / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D019207:beta Carotene / Q000032:analysis*
chemical_list: D019207:beta Carotene; D002338:Carotenoids; D000077276:Lycopene