Although many investigations on phytochemicals in rice plant parts and root exudates\nhave been conducted, information on the chemical profile of essential oil (EO) and potent biological\nactivities has been limited. In this study, chemical compositions of rice leaf EO and in vitro biological\nactivities were investigated. From 1.5 kg of fresh rice leaves, an amount of 20 mg EO was obtained\nby distillation and analyzed by gas chromatography-mass spectrometry (GC-MS), electrospray\nionization (ESI), and atmospheric pressure chemical ionization (APCI) to reveal the presence of twelve\nvolatile constituents, of which methyl ricinoleate (27.86%) was the principal compound, followed\nby palmitic acid (17.34%), and linolenic acid (11.16%), while 2-pentadecanone was the least (2.13%).\nTwo phytoalexin momilactones A and B were first time identified in EO using ultra-performance\nliquid chromatography coupled with electrospray mass spectrometry (UPLC/ESI-MS) (9.80 and\n4.93 ng/g fresh weight, respectively), which accounted for 7.35% and 3.70% of the EO, respectively...................
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