title: Raman spectroscopic determination of norbixin and tartrazine in sugar.
abstract: In this paper, a method for the detection of norbixin and tartrazine in sugar by means of resonance Raman spectroscopy is presented. The extraction was done in four steps using methanol and the measurements were performed in aqueous solution. The excitation wavelength was 514 nm for norbixin and 488 nm for tartrazine samples. The characteristic resonance Raman signals of the dyes were fitted by different functions. Depending on the R² values of the different fits, each spectrum was classified as positive or negative response. A detection limit of 250 ng g⁻¹ for norbixin and 989 ng g⁻¹ for tartrazine in solid sugar samples could be reached by logistic regression.
authors: Institute of Physical Chemistry and Abbe-Center of Photonics, Friedrich-Schiller-Universität, Jena, Germany.
authors: Ute
authors: U
authors: Uhlemann
authors: Katharina K
authors: KK
authors: Strelau
authors: Karina
authors: K
authors: Weber
authors: Paulo Augusto
authors: PA
authors: Da Costa Filho
authors: Petra
authors: P
authors: Rösch
authors: Jürgen
authors: J
authors: Popp
mesh_terms: D002182:Candy / Q000032:analysis / Q000592:standards; D002338:Carotenoids / Q000032:analysis*; D004396:Coloring Agents / Q000032:analysis*; D019422:Dietary Sucrose / Q000032:analysis* / Q000592:standards; D005062:European Union; D005503:Food Additives / Q000032:analysis*; D005513:Food Inspection / Q000379:methods*; D005858:Germany; D057230:Limit of Detection; D016015:Logistic Models; D011786:Quality Control; D013053:Spectrophotometry; D013059:Spectrum Analysis, Raman; D013645:Tartrazine / Q000032:analysis*
chemical_list: D004396:Coloring Agents; D019422:Dietary Sucrose; D005503:Food Additives; D002338:Carotenoids; C099823:norbixin; D013645:Tartrazine