BACKGROUND Traditional chemical methods were mainly used to evaluate the total antioxidant activity of essential oils. How to determine the bioactivity of each compound in mixtures is an interesting research topic. Nowadays, an ultra-fast gas chromatography electronic nose (E-nose) has been gradually used in the detection of volatile compounds, but the screening of the active components of essential oils has not been reported. E-nose coupled with chemical methodology was established using the essential oil from rosemary (EOR) as a specific application example. The proposed method can both identify the chemical constituents of EOR and quickly screen the antioxidant by comparing the change of chromatographic peak area of every component in EOR before and after reaction with free radicals. RESULTS Among all chemical constituents in EOR, verbenone, eucalyptol and o-cymene showed the strongest scavenging abilities in 1,1'-diphenyl-2-picrylhydrazine (DPPH·), 2,2'-azino-bis(3-ethyl-benzothiazoline-6-sulphonate) (ABTS·+ ) and hydroxyl (·OH) radicals, respectively, with scavenging rates of 67.9%, 39.5%, and 69.9%. The reliability and feasibility of using E-nose to identify chemical constituents of EOR were verified by gas chromatography-tandem mass spectrometry (GC-MS/MS). The GC-MS/MS results showed that the main components of EOR were α-pinene (422.2 μg g-1 ), p-cymene (208.4 μg g-1 ), camphor (203.5 μg g-1 ), verbenone (160.2 μg g-1 ), and eucalyptol (129.1 μg g-1 ). CONCLUSIONS The E-nose methods can be used as a complementary method to traditional spectrophotometric techniques. And this study will be of great significance for the rapid screening of antioxidant active components in essential oils from natural products. This article is protected by copyright. All rights reserved.

中文翻译：

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超快速气相色谱电子鼻结合化学方法筛选迷迭香精油的抗氧化活性及化学成分

背景技术传统的化学方法主要用于评估精油的总抗氧化活性。如何确定混合物中每种化合物的生物活性是一个有趣的研究课题。目前，超快速气相色谱电子鼻（E-nose）已逐渐应用于挥发性化合物的检测，但尚无精油活性成分的筛选报道。以迷迭香精油 (EOR) 为具体应用实例，建立了电子鼻结合化学方法。该方法通过比较EOR中各组分与自由基反应前后色谱峰面积的变化，既可以鉴别EOR的化学成分，又可以快速筛选抗氧化剂。结果 在 EOR 的所有化学成分中，马鞭草酮、桉油精和邻异丙基苯在 1,1'-diphenyl-2-picrylhydrazine (DPPH·), 2,2'-azino-bis(3-ethyl-benzothiazoline-6-sulphonate) (ABTS·+) 中表现出最强的清除能力和羟基 (·OH) 自由基，清除率分别为 67.9%、39.5% 和 69.9%。通过气相色谱-串联质谱 (GC-MS/MS) 验证了使用电子鼻识别 EOR 化学成分的可靠性和可行性。GC-MS/MS 结果表明 EOR 的主要成分为 α-蒎烯（422.2 μg g-1 ）、对伞花烃（208.4 μg g-1 ）、樟脑（203.5 μg g-1 ）、马鞭草酮（160.2 μg g-1) 和桉叶油素 (129.1 μg g-1)。结论 电子鼻方法可以作为传统分光光度技术的补充方法。该研究对于从天然产物中快速筛选精油中的抗氧化活性成分具有重要意义。本文受版权保护。版权所有。