Methionine and riboflavin are useful nutrients in foods, especially, dairy products. However, during light irradiation, methionine is well-known to produce sulfur off-odorants due to the participation of photosensitized riboflavin under neutral conditions. In this study, the important sulfur off-odorants were found to be methional, dimethyl disulfide, and dimethyl trisulfide, formed from methionine and riboflavin under acidic conditions during light irradiation. The inhibition effect of a variety of antioxidants on the formation of the off-odorants has also been studied.
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