Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China.
Department of Agronomy, Bayero University Kano, Kano P.M.B. 3011, Nigeria.
Molecules. 2022 Oct 28;27(21):7343. doi: 10.3390/molecules27217343.
In the current study, the total content from two species leaves ( and ) collected from the Ili River Valley Region were extracted, and their bioactivities were investigated. The results showed a significant variation in the total flavonoid contents in the leaf samples collected at different periods (June, July, August, and September), with the highest content in August (60.11 ± 0.38 mg RE/g DW for and 56.56 ± 0.24 mg RE/g DW for ), and the lowest in June (22.36 ± 0.05 mg RE/g DW for and 20.79 ± 0.02 mg RE/g DW for ). The total flavonoid content was comparably higher in than in . Leaves extracts from the two species demonstrated strong bioactivity, which positively correlated with the total flavonoid contents. The anti-oxidative activity of was higher than that of in tandem with its higher flavonoid contents; the antibacterial activity, however, was conversely opposite. Furthermore, a total of 83 flavonoid metabolites were identified in the two species based on UPLC-ESI-MS/MS, out of which 24 metabolites were differentially accumulated. The variability in these metabolites might be the reason for the different bioactivities displayed by the two species. The present study provides insight into the optimal harvest time for species planted in the major distribution area of the Ili River Valley and the specific utilization of and .
在本研究中，我们从伊犁河流域采集的两种叶片（和）中提取总黄酮，并研究其生物活性。结果表明，不同时期（6 月、7 月、8 月和 9 月）采集的叶片样本中总黄酮含量存在显著差异，8 月含量最高（60.11±0.38 mg RE/g DW 为 ，56.56±0.24 mg RE/g DW 为 ），6 月含量最低（22.36±0.05 mg RE/g DW 为 ，20.79±0.02 mg RE/g DW 为 ）。总黄酮含量在中较高。两种植物叶片提取物均表现出较强的生物活性，与总黄酮含量呈正相关。与相比，具有更高的黄酮类化合物含量，其抗氧化活性更高；然而，其抗菌活性则相反。此外，基于 UPLC-ESI-MS/MS，在两种植物中共鉴定出 83 种黄酮类代谢物，其中 24 种代谢物差异积累。这些代谢物的变异性可能是两种植物表现出不同生物活性的原因。本研究为伊犁河流域主要分布区种植的物种的最佳收获时间以及和的具体利用提供了参考。
