ABSTRACT Twenty-six key odourants were found in Hongxin and Shatian pomelo peel oils using aroma extraction dilution analysis (AEDA). trans-2-Dodecenal was identified to be the most potent key odourant, with a flavour dilution value of 100000 in Hongxin and 10000 in Shatian. Hongxin peel oil was found to be more floral while Shatian was green and peely. Gas chromatography coupled with quadrupole time-of-flight mass spectrometry (GC-QTOF/MS) revealed 22 volatiles that were undetected by the less sensitive GC-MS detector. Non-volatile compounds in the peel oils were identified and quantified using liquid chromatography (LC)-QTOF/MS. Besides organic acids, naringin and bergamottin were, concentration-wise, the dominant non-volatile compounds identified in the juices and peel oils, respectively. Pomelo juices had higher antioxidant capacities than their peel oils, and Shatian pomelos possessed higher antioxidant activities than Hongxin. The use of high-resolution detectors allowed for improved compound detection and identification in citrus, and may be applied to other complex natural products.

中文翻译：

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用气相色谱-嗅觉法、气相色谱法和液相色谱-四极杆飞行时间质谱法表征柚子中的挥发性和非挥发性化合物

摘要 使用香气萃取稀释分析 (AEDA) 在红心和沙田柚皮油中发现了 26 种主要气味物质。trans-2-Dodecenal 被鉴定为最有效的关键气味剂，其风味稀释值在红心为 100000，在沙田为 10000。发现红心果皮油更花香，而沙田绿皮。气相色谱结合四极杆飞行时间质谱 (GC-QTOF/MS) 揭示了 22 种挥发性物质，这些挥发性物质未被灵敏度较低的 GC-MS 检测器检测到。使用液相色谱 (LC)-QTOF/MS 鉴定和定量果皮油中的非挥发性化合物。除了有机酸，柚皮苷和佛手柑分别是果汁和果皮油中鉴定出的主要非挥发性化合物。柚汁比果皮油具有更高的抗氧化能力，沙田柚比红心柚具有更高的抗氧化活性。高分辨率检测器的使用可以改进柑橘中的化合物检测和鉴定，并可应用于其他复杂的天然产品。