Assessment of lutein, zeaxanthin and
meso-zeaxanthin concentrations in dietary supplements by chiral high-performance liquid chromatography.
Eur Food Res Technol 2015;
242:599-608. [PMID:
27069419 PMCID:
PMC4788689 DOI:
10.1007/s00217-015-2569-9]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 09/25/2015] [Accepted: 09/27/2015] [Indexed: 01/08/2023]
Abstract
We investigated the concordance between actual and declared content of the three macular carotenoids in commercially available supplements aimed at eye health. Three batches of nine products were tested for content of lutein (L), zeaxanthin (Z) and meso-zeaxanthin (MZ) by chiral HPLC–DAD. In every product tested, actual L concentration was close to target, but Z concentration varied greatly (47–248 % of declared concentration), and the L:Z ratio within some supplements was adversely affected in consequence. In six of seven products not declaring MZ, we found this carotenoid, and four of them, using the same L source, contained a concentration of MZ that correlated positively and significantly with measured concentrations of L (r2 = 0.86; P < 0.001). More transparency is needed in terms of concordance between actual and declared concentrations of Z in commercially available formulations, and MZ should be declared in those formulations where it is present.
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