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A comparative micro-analysis ~as made of the carbonyl compounds in control and sunlight-exposed milk. Alk-2-enals (C6-C~o) were detectable in the exposed milk and absent from the control milk. Significantly higher levels of butanone and pentanone were observed in the exposed than in the control milk. Exposure caused a significant decrease in the formaldehyde content of the milk. Methional could not be detected in the exposed milk. The previously indicated role of methional in sunlight milk flavor may be mediated by its conversion to other flavorful sulfur compounds.
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Wishner et al. (1963) studied this question.
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