Identification of natural oak lactone precursors in extracts of american and French oak woods by liquid chromatography-tandem mass spectrometry |
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| Authors: | Hayasaka Yoji Wilkinson Kerry L Elsey Gordon M Raunkjaer Michael Sefton Mark A |
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| Institution: | The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, SA, 5064 Australia. yoji.hayasaka@awri.com.au |
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| Abstract: | A method for the screening of potential natural oak lactone precursors in oak wood extracts using LC-MS/MS combined with information-dependent acquisition was developed. The method was applied to extracts of American and French oak woods. As a result, cis-3-methyl-4-galloyloxyoctanoic acid (ring-opened cis-oak lactone gallate), (3S,4S)- and (3S,4R)-3-methyl-4-O-beta-D-glucopyranosyloctanoic acid (ring-opened cis- and trans-oak lactone glucoside), and (3S,4S)-3-methyl-4-O-(6'-O-galloyl)-beta-D-glucopyranosyloctanoic acid (ring-opened cis-oak lactone galloylglucoside) were identified as natural oak lactone precursors in the extracts by comparison with the respective synthetic reference compounds. In addition, the ring-opened oak lactone rutinoside was tentatively identified in the extracts. Three apparent isomers of the ring-opened cis-oak lactone galloylglucoside were also observed. |
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