Abstract

Essential oils from the leaves of four species of Piper obtained through hydrodistillation were analyzed using GC-MS andmultivariate data analysis. The chemical analysis enabled the identification of qualitative and quantitative differences among the oils. β-selinene (32.44 ± 1.14%), (E)-nerolidol (44.23 ± 2.23%), β-caryophyllene (19.11 ± 0.40%) and caryophyllene oxide (16.92 ± 0.21%) were identified as the major constituents of the P. mollipilosum, P. brachypetiolatum, P. glandulosissimum and P. madeiranum oils, respectively. The differences in the chemical profiles of the oils were confirmed by principal component analysis. All four species exhibited antioxidant activity. The oil from P. brachypetiolatum achieved the best results on the DPPH test (EC₅₀ = 64.8 µg/ml) and with the ABTS radical (EC₅₀ = 159.7 µg/ml).

摘要

使用GC-MS和多变量数据分析分析了通过水蒸馏获得的四种Piper叶子的精油。化学分析能够识别油之间的定性和定量差异。β- selinene (32.44 ± 1.14%)、( E )-nerolidol (44.23 ± 2.23%)、β- caryophyllene (19.11 ± 0.40%) 和石竹烯氧化物 (16.92 ± 0.21%) 被确定为P.的主要成分。 mollipilosum、P. brachypetiolatum、P.glunosissimum和P. madeiranum油，分别。通过主成分分析证实了油的化学特征的差异。所有四种物种都表现出抗氧化活性。来自P. brachypetiolatum的油在 DPPH 测试 (EC ₅₀ = 64.8 µg/ml) 和 ABTS 自由基 (EC ₅₀ = 159.7 µg/ml) 中取得了最佳结果。