Journal Highlight: Authentication of the origin of sucrose-based sugar products using quantitative natural abundance 13C NMR

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  • Published: May 30, 2016
  • Author: spectroscopyNOW
  • Channels: NMR Knowledge Base
thumbnail image: Journal Highlight: Authentication of the origin of sucrose-based sugar products using quantitative natural abundance <sup>13</sup>C NMR
A direct 13C nuclear magnetic resonance (NMR) method can differentiate between sucrose-based sugar products produced from sugar beet (C3 plant) and sugar cane (C4 plant), providing an alternative to isotope ratio MS.

Authentication of the origin of sucrose-based sugar products using quantitative natural abundance 13C NMR

Journal of the Science of Food and Agriculture, 2016, 96, 2861-2866
Yulia B Monakhova and Bernd WK Diehl

Abstract: A direct 13C nuclear magnetic resonance (NMR) method has been validated to differentiate between sucrose-based sugar products produced from sugar beet (C3 plant) and sugar cane (C4 plant). The method is based on calculating relative 13C content of the C1, C2, C5, and the C1, C4, C5, C6 positions of the glycosyl and fructosyl moieties of the sucrose molecule, respectively. NMR acquisition parameters and data processing have been optimized to reach a high level of intraday and interday precision (<0.2%). Good linearity (R2 = 0.93) was obtained for the beet sugar–cane sugar blends containing from 0 to 100 wt% of beet sugar. The method was applied to ten commercial sucrose-based sugar products of different botanical origin. Principal component analysis (PCA) was applied to the relative peak areas for replicate measurements to visualize the difference between studied products. The 13C NMR method is a good alternative to complex isotope ratio mass spectrometry measurements for routine detection and semi-quantification of adulteration of commercial cane sugar (C4 plant) with less expensive beet sugar (C3 plant).

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