Current Projects
- Determine the vitamin A equivalence of plant carotenoids in children, using deuterium-labeled spinach, Golden Rice, and pure beta-carotene.
- Determine the vitamin A equivalence of spirulina in adults with and without vitamin A malnutrition.
- Determine the vitamin A equivalence of yellow maize in adults in Zimbabwe.
- Determine the bioavailability of lutein and zeaxanthin/capsanthin from peppers in humans.
- Evaluate the effect of nutritional supplements on the progression of retinal disease.
- Examine the relationship between serum levels of antioxidants and the presence of age-related maculopathy.
- Determine the changes in macular pigment density of the eye and changes in antioxidant capacity in the circulation when consuming lutein with or without green tea extract.
- Determine the major factors affecting antioxidant capacity in humans and to modify antioxidant capacity by supplementing with antioxidant nutrients.
- Elucidate effects of bioactive plant-based foods on biological functions and genomic stability in humans.
- Examine the functions of dipeptides as a quencher of cytotoxic carbonic compounds.
- Determine the association between oxidative damage and liver dysfunction in HIV positive Hispanic drug abusers.
- Evaluate the role of lipoprotein subpopulations in macular pigmentation.
- Develop a database of individual levels of lutein and zeaxanthin in their major food sources in the U.S. diet.
- Apply the lutein and zeaxanthin food database to determine their individual intakes in populations.
- Determine the role of xanthophylls in cognitive function.
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