Composition of Lutein Ester Regioisomers in Marigold Flower, Dietary Supplement, and Herbal Tea.
Characterization of lutein and its esters in a health product is necessary for its efficacy. In the current study lutein ester regioisomers were quantified and identified in several dietary supplements and herbal teas in comparison with marigold flower, the commercial source of lutein. The products were extracted with three solvents and separated on a C30 column. The separated esters were identified/confirmed with LC-MS in APCI+ve mode with the use of synthetic lutein esters. The total content of lutein esters substantially varied among marigold flowers (167-5752 μg/g), supplements (88,000-110,700 μg/g), and herbal teas (12.4-91.3 μg/g). Lutein supplement had a lutein profile similar to that of marigold flower, whereas herbal tea showed an extremely different profile. Lutein dipalmitate was the dominant compound in supplements and marigold flowers followed by lutein 3'-O-myristate-3-O-palmitate and lutein 3'-O-palmitate-3-O-myristate. Lutein was the major compound in marigold herbal tea with small amounts of lutein mono- and diesters. Differences in the concentration and composition of lutein compounds among marigold products could indicate distinct product quality and lutein bioavailability.
Guelph Food Research Centre, Agriculture and Agri-Food Canada , 93 Stone Road West, Guelph, Ontario, Canada N1G 5C9.
El-Sayed M
el-SM
Abdel-Aal
Guelph Food Research Centre, Agriculture and Agri-Food Canada , 93 Stone Road West, Guelph, Ontario, Canada N1G 5C9.
Iwona
I
Rabalski
D019587:Dietary Supplements / Q000032:analysis*; D035264:Flowers / Q000737:chemistry*; D014975:Lutein / Q000737:chemistry*; D013058:Mass Spectrometry; D010936:Plant Extracts / Q000737:chemistry*; D013237:Stereoisomerism; D031686:Tagetes / Q000737:chemistry*; D000069459:Teas, Herbal / Q000032:analysis*
D010936:Plant Extracts; D000069459:Teas, Herbal; D014975:Lutein
carotenoids; dietary supplement; herbal tea; lutein esters; marigold; separation and quantification