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The accuracy of the methods was verified by determining the sesamol and sesamin constants of sesamin concentrates and sesame oils before and after the addition of known amounts of these substances. The results of the recovery tests with added sesamol as determined by the spectrophotometric and photocolorimetric procedures are shown in Table I, while those for added sesamin as determined spectrophotometrically are shown in Table II.It is seen from these tables that the recoveries of added sesamol and sesamin in sesamin concentrates and sesame oil vary from 90 to 101%, which may be considered satisfactory.The spectrophotometric and photocolorimetric procedures were applied to a series of commercial sesamin concentrates and to sesame oils, as indicated in Table III.The sesamin concentrates ranged from 0.04 to 0.23% free sesamol, 0.90 to 2.35% bound sesamol, and 5.13 to 19.23% sesamin, respectively, whereas the oils ranged from 0.

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