期刊
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
卷 234, 期 3, 页码 399-404出版社
SPRINGER
DOI: 10.1007/s00217-011-1646-y
关键词
IPMP; SBMP; IBMP; Ladybird taint; Gaschromatography
资金
- 'Forschungsring deutscher Weinbau' (FDW)
- JKI Grape-breeding Institut
The study focuses on the odor-active intensity and occurrence of three methoxypyrazines in ladybird beetles, Harmonia axyridis, invasive in Europe and the USA, and Coccinella septempunctata, native in Europe, but invasive in the USA. It is known from previous studies that H. axyridis has negatively influenced the taste of wine in the USA because of releasing their hemolymph in must during harvesting. In relation to C. septempunctata, H. axyridis had more nitrogen containing compounds in its hemolymph and 2-isopropyl-3-methoxypyrazine (IPMP) and mainly 2-sec-buthyl-3-methoxypyrazine (SBMP) in higher amounts. The compound IPMP was detected as the main odor-active compound in both ladybird beetle species. Wines infested with hemolymph of C. septempunctata were more readily detected as altered wine with a 'ladybird taint' than wines infested with H. axyridis. 2-isobuthyl-3-methoxypyrazine (IBMP) could be identified as second intensive odor-active compound of C. septempunctata, which occurred in a much lower frequency in H. axyridis. SBMP, the second highest measured N-compound of H. axyridis, had a lower olfactory active threshold in gas chromatography-olfactometry test. C. septempunctata contained less SBMP in its hemolymph than H. axyridis. This study objected that besides H. axyridis also C. septempunctata can influenced the taste of wine in a detectable way.
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