TY  - SER
AU  - Lombeida,Wagner O.
AU  - Rubio,Fernando
AU  - Levy,Luis W.
TI  - Determination of lutein and zeaxanthin esters and their geometric isomers in carotenoid ester concentrates used as ingredients in nutritional supplements: validation of a combined spectrophotometric-HPLC method 
N1  - YS2017 M05
ISSN  - 1060-3271
Sources  - Journal of AOAC International
Sources  - 99 (6) 2016 : 1459-1469
ER  -