2001 journal article
Antioxidant properties of evening primrose seed extracts
Journal of Agricultural and Food Chemistry, 49(9), 4502–4507.
By: A. Birch, G. Fenner, R. Watkins & L. Boyd
1999 journal article
Carotenoid composition of marigold (Tagetes erecta) flower extract used as nutritional supplement
Journal of Agricultural and Food Chemistry, 47(10), 4189–4194.
By: W. Hadden, R. Watkins, L. Levy, E. Regalado, D. Rivadeneira, R. Van Breemen, S. Schwartz
Color improvement and metallo-chlorophyll complexes in continuous flow aseptically processed peas
Journal of Food Science, 64(6), 987–990.
By: F. Canjura, R. Watkins & S. Schwartz
Packaging preservation of beta-carotene in sweet potato flakes using flexible film and an oxygen absorber
Journal of Food Quality, 22(1), 63–73.
By: C. Emenhiser, R. Watkins, N. Simunovic, N. Solomons, J. Bulux, J. Barrows, S. Schwartz
1997 journal article
Bixin and norbixin in human plasma: determination and study of the absorption of a single dose of annatto food color
Analyst [London], 122(9), 977–980.
By: L. Levy, E. Regalado, S. Navarrete & R. Watkins