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Four New Flavonoids Isolated from the Aerial Parts of Cadaba rotundifolia Forssk. (Qadab)

机译:从Cadaba rotundifolia Forssk的地上部分中分离出的四个新类黄酮。 (Qadab)

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摘要

Cadaba rotundifolia (Forssk.) (family: Capparaceae; common name: Qadab) is one of four species that grow in the Red Sea costal region in the Kingdom of Saudi Arabia. The roots and leaves of C. rotundifolia is traditionally used to treat tumors and abscesses in Sudan. A previous phytochemical study of the roots yielded a quaternary alkaloid, but no report on chemical constituents of the aerial parts of the C. rotundifolia growing in Saudi Arabia has been issued so far. Oxidative stress and advanced glycation end products (AGEs) are thought as causal factors in many degenerative diseases, such as Alzheimer’s disease, diabetes, atherosclerosis and aging. In this study, a total of twenty compounds, including four previously undescribed acylated kaempferol glucosides, were isolated from the aerial parts of C. rotundifolia collected in Saudi Arabia. These new compounds were identified as kaempferol 3-O-[2-O-(trans-feruloyl)-3-O-β-d-glucopyranosyl]-β-d-glucopyranoside (>1), kaempferol 3-O-β-neohesperidoside-7-O-[2-O-(cis-p-coumaroyl)-3-O-β-d-glucopyranosyl]-β-d-glucopyranoside (>2), kaempferol 3-O-[2,6-di-O-α-l-rhamnopyranosyl]-β-d-glucopyranoside-7-O-[6-O-(trans-feruloyl)]-β-d-glucopyranoside (>3) and kaempferol 3-O-[2,6-di-O-α-l-rhamnopyranosyl]-β-d-glucopyranoside-7-O-[6-O-(trans-p-coumaroyl)]-β-d-glucopyranoside (>4). Their structures were established based on UV-visible, 1D, 2D NMR, and HR-ESI-MS analyses. Of the assayed compounds, >17 and >18 showed potent radical scavenging activity with IC50 values of 14.5 and 11.7 µM, respectively, and inhibitory activity toward AGEs together with compound >7 with IC50 values 96.5, 34.9 and 85.5 µM, respectively.
机译:Cadaba rotundifolia(Forssk。)(科:Capparaceae;通用名:Qadab)是在沙特阿拉伯王国红海沿海地区生长的四个物种之一。传统上,圆叶衣原体的根和叶用于治疗苏丹的肿瘤和脓肿。先前对根的植物化学研究产生了第四级生物碱,但迄今为止,尚未发表有关在沙特阿拉伯生长的圆叶衣原体空中部分化学成分的报道。氧化应激和晚期糖基化终产物(AGEs)被认为是许多退化性疾病的病因,例如阿尔茨海默氏病,糖尿病,动脉粥样硬化和衰老。在这项研究中,从沙特阿拉伯收集的C. rotundifolia的地上部分中分离出了总共二十种化合物,其中包括四种先前未描述的酰化山fer酚糖苷。这些新化合物被鉴定为山emp酚3-O- [2-O-(反式阿魏酰基)-3-O-β-d-吡喃吡喃糖基]-β-d-吡喃葡萄糖苷(> 1 ),山ka酚3-O-β-新皮苷7-O- [2-O-(顺式-对-香豆酰基)-3-O-β-d-吡喃葡萄糖基]-β-d-吡喃葡萄糖苷(> 2 ),山奈酚3-O- [2,6-di- O -α-1-鼠李糖基吡喃糖基]-β-d-吡喃葡萄糖苷-7- O -[6- O -( trans -阿魏酰基)]-β-d-吡喃葡萄糖苷(> 3 )和山奈酚3- O -[2,6-di- O -α-l-鼠李吡喃糖基]-β-d-吡喃葡萄糖苷-7- O -[6- O -( trans - p -香豆酰基)]-β-d-吡喃葡萄糖苷(> 4 )。基于紫外线可见,1D,2D NMR和HR-ESI-MS分析建立了它们的结构。在测定的化合物中,> 17 和> 18 显示出有效的自由基清除活性,IC50值分别为14.5和11.7 µM,对AGEs和化合物> 7的抑制活性,其IC50值分别为96.5、34.9和85.5 µM。

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