title: Quantitative measurement of 3'-oxolutein from human retina by normal-phase high-performance liquid chromatography coupled to atmospheric pressure chemical ionization mass spectrometry.
abstract: 3-Hydroxy-beta,epsilon-carotene-3'-one (3'-oxolutein) is the major oxidative metabolite of dietary carotenoids in the retina of the human eye. Elucidating the biochemical mechanism of its formation may provide helpful insight into the pathogenesis of age-related macular degeneration; however, it is found in relatively low quantities that require highly sensitive methods for quantitation from individual retinas. Normal-phase high-performance liquid chromatography coupled to atmospheric pressure chemical ionization mass spectrometry allowed us to do quantitative analysis of 3'-oxolutein from central and peripheral retinas obtained from individual human donors. The limit of quantification for 3'-oxolutein in human retina at a signal-to-noise ratio of 10 was 6 pg. The precision of the assay yielded a coefficient of variation ranging from 4.7 to 7.4% and accuracies of 106-108%. A statistically significant (R = 0.99, p < or = 0.001) linear working range was achieved between 5 and 7200 pg. The 3'-oxolutein contents from 8-mm punches of the central macula and peripheral retina were found to be 375+/-192 and 191+/-95 pg/tissue, respectively.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Moran Eye Center, University of Utah School of Medicine, Salt Lake City, UT 84132, USA.
authors.forename: Prakash
authors.initials: P
authors.lastname: Bhosale
authors.forename: Paul S
authors.initials: PS
authors.lastname: Bernstein
mesh_terms: D000328:Adult; D001274:Atmospheric Pressure; D002138:Calibration / Q000592:standards; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006801:Humans; D014975:Lutein / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D008297:Male; D008875:Middle Aged; D015394:Molecular Structure; D015203:Reproducibility of Results; D012160:Retina / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C051820:3'-oxolutein; D014975:Lutein