Núcleo de Pesquisa em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, Brazil.
Nat Prod Res. 2012;26(24):2323-9. doi: 10.1080/14786419.2012.671320. Epub 2012 Mar 29.
Chemical investigation of the n-hexane and EtOAc fractions of the ethanolic extract from Styrax pohlii (Styracaceae) aerial parts resulted in the isolation of the benzofuran nor-neolignan derivatives egonol (1), homoegonol (2), homoegonol gentiobioside (3), homoegonol glucoside (4) and egonol gentiobioside (5). This is the first report of compounds 1-5 in S. pohlii. Compounds 1-5, the acetyl derivatives 1 a and 2 a, the ethanolic extract (EE), the n-hexane fraction (HF) and EtOAc fraction (EF) were tested for their inhibitory activities against COX-1 and COX-2. The results showed that EE, HF, EF and compounds 1-5 and 1 a-2 a shown weak to moderate inhibition of COX-1 and COX-2. Among the assayed nor-neolignans, 4 gave a COX-1 inhibition of 35.7% at 30 µM. Compound 5 displayed a COX-2 inhibition of 19.7% at 30 µM.
从 Styrax pohlii(Styracaceae)地上部分的乙醇提取物的正己烷和 EtOAc 部分进行化学研究,分离得到苯并呋喃类新木脂素衍生物 egonol(1)、homoeogonol(2)、homoeogonol 芹糖基糖苷(3)、homoeogonol 葡萄糖苷(4)和 egonol 芹糖基糖苷(5)。这是化合物 1-5 在 S. pohlii 中的首次报道。化合物 1-5、乙酰衍生物 1a 和 2a、乙醇提取物(EE)、正己烷部分(HF)和 EtOAc 部分(EF)均测试了对 COX-1 和 COX-2 的抑制活性。结果表明,EE、HF、EF 以及化合物 1-5 和 1a-2a 对 COX-1 和 COX-2 表现出弱至中度的抑制作用。在所测试的新木脂素中,化合物 4 在 30 µM 时对 COX-1 的抑制率为 35.7%。化合物 5 在 30 µM 时对 COX-2 的抑制率为 19.7%。