Synthetic mixtures of 24 mono- and diesters of the asymmetric hydroxylated carotenoid lutein with lauric, myristic, palmitic, and stearic acids were analyzed by liquid chromatography-ultraviolet/visible spectroscopy (LC-UV-vis) and characterized by LC-mass spectrometry (MS) and nuclear magnetic resonance spectroscopy (NMR). These compounds were then used for identifying the composition of a commercial lutein supplement. This is the first report of chromatographic separation of mixed fatty acid lutein diesters. Preferential MS loss of fatty acids or water occurred initially at the 3'-hydroxy position in the epsilon-ionone ring and subsequently at the 3-hydroxy position in the beta-ionone ring. This selective fragmentation leads to facile assignment of the specific fatty acids to the appropriate regioisomeric ionone ring. A commercial lutein supplement contained low levels of two pairs of regioisomeric monoesters and nearly equal levels of three homogeneous diesters and five pairs of mixed diesters. Palmitic acid was the predominant fatty acid, with lower amounts of myristic, stearic, and lauric acids.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing Hydroxylation of N-Methylcarbamate Insecticides by Rhodococcus TE1Ram M. Behki, Edward E. Topp, and Barbara A. BlackwellCite this: J. Agric. Food Chem. 1994, 42, 6, 1375–1378Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/jf00042a025https://doi.org/10.1021/jf00042a025research-articleACS PublicationsRequest reuse permissionsArticle Views105Altmetric-Citations13LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
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Oligosaccharides obtained by the action of (1→3), (1→4)-β-D-glucan-4-glucanohydrolase (lichenase) on the (1→3), (1→4)-β-D-glucan of oats (oat β-glucan) were characterized by methylation analysis. The polysaccharide was confirmed as composed mainly of β-(1→3)-linked cellotriosyl and cellotetraosyl units with a small amount of regions containing 4-8 consecutive (1→4)-linked units. 13 C-Nuclear magnetic resonance data confirmed these structural features
