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Antioxidant activity screening and chemical constituents of the essential oil from rosemary by ultra‐fast GC electronic nose coupled with chemical methodology
Author(s) -
Nie JiYu,
Li Rong,
Jiang ZiTao,
Wang Ying,
Tan Jin,
Tang ShuHua,
Zhang Yi
Publication year - 2020
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.10388
Subject(s) - eucalyptol , chemistry , dpph , essential oil , camphor , gas chromatography–mass spectrometry , electronic nose , chromatography , antioxidant , abts , gas chromatography , mass spectrometry , organic chemistry , materials science , nanotechnology
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. Furthermore, this study will be of great significance for the rapid screening of antioxidant active components in essential oils from natural products. © 2020 Society of Chemical Industry