Characterization of Oxygenated Heterocyclic Compounds and in vitro Antioxidant Activity of Pomelo Essential Oil

作者：Guijie Li, Yujiao Cheng, Tenghui Zhang, Yingzhuo Li, Leng Han, Guolu Liang · 发表于：Drug Design Development and Therapy · 年份：2021 · DOI：10.2147/dddt.s299678 · 被引用次数：21 · 研究领域：Plant chemical constituents analysis、Essential Oils and Antimicrobial Activity、Phytochemicals and Antioxidant Activities

Purpose: Citrus essential oils are widely used for aromatherapy and the alternative treatment of chronic diseases. Beyond the aroma substances, they are known to contain bioactive nonvolatile components; however, little knowledge has been gained about nonvolatiles in the essential oil of pomelo ( Citrus grandis Osbeck), the largest citrus fruit. The purpose of this study was to analyze the nonvolatile oxygenated heterocyclic compounds (OHCs) of pomelo essential oils and evaluate their in vitro antioxidant activities for further development. Methods: Cold-pressed essential oil (CPEO) and distilled essential oil (DEO) were obtained from the peel of the Liangping pomelo cultivar. High-performance liquid chromatography (HPLC) coupled with a photodiode array and fluorescence detection method was developed to identify and quantify the OHCs of the two essential oils. Ferric reducing antioxidant power and 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2-phenyl-4,4,5,5-tetramethyl-imidazoline-1-oxyl 3-oxide (PTIO) radical scavenging assays were used to determine the antioxidative capabilities. Results: Thirteen OHCs were identified in CPEO. Coumarins such as meranzin (2.0 mmol L − 1 ) and furanocoumarins such as isoimperatorin (1.3 mmol L − 1 ) composed the majority of nonvolatiles in CPEO. These OHCs were characterized by high proportion (58%) of side chain epoxides. Five OHCs, namely, auraptenol, 6ʹ,7ʹ-dihydroxybergamottin (6ʹ,7ʹ-DHB), imperatorin, isoimperatorin and 8-geranyloxypsoralen ...