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- Day 3, May 17（Thu.） Poster
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3P-33 PDF
Exploration of a Fishy-Smelling Substance in Raw Waters by Combining High-Resolution Mass Spectrometry with Multivariate Analysis
Off-flavor events in raw waters for tap waters have been reported from various regions of Japan. The causative compounds of earthy-musty smell, which is the most common off-flavor, are already identified. In contrast, few papers have been reported so far which successfully identified a causative compound of fishy-smell, the second most common off-flavor.
Therefore, the objective of this study was to explore a causative compound of the fishy-smell in raw waters. Raw water samples taken from a waterworks and cultured medium with Uroglena americana, a well-known causative organism, were analyzed by a high-resolution mass spectrometer and a multivariate analysis. As a result, one candidate was acquired whose m/z value was 403.1625. The intact molecular formula it had was determined to be C13H20O3 based on its exact mass and the natural isotopic pattern. This compound could be detected from both samples (the raw waters and the cultured medium). Furthermore, we could successfully detected this compounds both in an ESI mode and an APCI mode. High correlation (R2>0.9) was shown between its peak volume and the TON value as well as the number of cells, suggesting that the candidate is a possible causative compound of the fishy-smell in raw waters.