Raman spectroscopic determination of norbixin and tartrazine in sugar.
Summary of "Raman spectroscopic determination of norbixin and tartrazine in sugar."
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 R (2) 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.
Affiliation
a Institute of Physical Chemistry and Abbe-Center of Photonics, Friedrich-Schiller-Universität , Jena , Germany.
Journal Details
This article was published in the following journal.
Name: Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment
ISSN: 1944-0057
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22742561
- DOI: http://dx.doi.org/10.1080/19440049.2012.691556
Medical and Biotech [MESH] Definitions
Spectrum Analysis, Raman
Analysis of the intensity of Raman scattering of monochromatic light as a function of frequency of the scattered light.
Tartrazine
An anionic, hydrophilic azo dye with an orange-yellow color used in fabrics, foods and cosmetics, and as a biological stain.
Sugar Alcohol Dehydrogenases
Reversibly catalyzes the oxidation of a hydroxyl group of sugar alcohols to form a keto sugar, aldehyde or lactone. Any acceptor except molecular oxygen is permitted. Includes EC 1.1.1.; EC 1.1.2. and EC 1.1.99.
Phosphoenolpyruvate Sugar Phosphotransferase System
The bacterial sugar phosphotransferase system (PTS) that catalyzes the transfer of the phosphoryl group from phosphoenolpyruvate to its sugar substrates (the PTS sugars) concomitant with the translocation of these sugars across the bacterial membrane. The phosphorylation of a given sugar requires four proteins, two general proteins, Enzyme I and HPr and a pair of sugar-specific proteins designated as the Enzyme II complex. The PTS has also been implicated in the induction of synthesis of some catabolic enzyme systems required for the utilization of sugars that are not substrates of the PTS as well as the regulation of the activity of adenylate cyclase. EC 2.7.1.-.
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