Michailidis Dimitris, Angelis Apostolis, Aligiannis Nektarios, Mitakou Sofia, Skaltsounis Léandros
Faculty of Pharmacy, Department of Pharmacognosy and Natural Products Chemistry, University of Athens, Athens, Greece.
Front Pharmacol. 2019 Jun 28;10:723. doi: 10.3389/fphar.2019.00723. eCollection 2019.
In this study, an integrated process for the recovery of sesamin and sesamolin, two high added-value lignans of sesame oil (SO) was developed, using synchronous extraction and chromatography techniques. The extraction of SO phenolic content was studied using two different extraction techniques: Annular centrifugal extraction (ACE) and centrifugal partition extraction (CPE). The derived data of each experiment were compared in terms of revealing the yields, time, and solvents consumption showing that CPE is the most effective technique, concerning the solvent consumption. The isolation of lignans was achieved using centrifugal partition chromatography (CPC) both on semi-preparative and preparative scale. The biphasic system used for this purpose consisted of the following solvents: n-Hex/EtOAc/EtOH/HO in proportion 2:3:3:2 (v/v/v/v) and direct recovery of the two major lignans sesamin and sesamolin was achieved. In parallel the CPC analysis resulted in the isolation of four minor lignans of sesame oil, i.e., samin, sesamol, sesaminol, and episesaminol. Structure elucidation of isolated lignans was based on HRMS/MS and NMR experiments. High-performance liquid chromatography (HPLC) was employed for quantitative analysis of the obtained extracts to determine the purity of the isolated compounds as well. The results of this study demonstrated that sesamin and sesamolin were recovered in purity higher than 95%, verifying the effectiveness of the purposed separation methodology. Finally, due to the general application of sesame oil in cosmetic industry, all the pure compounds were evaluated for their tyrosinase, elastase, collagenase, and hyaluronidase inhibition activity.
在本研究中,开发了一种综合工艺,用于回收芝麻油(SO)中的芝麻素和芝麻林素这两种高附加值木脂素,采用同步萃取和色谱技术。使用两种不同的萃取技术研究了SO酚类成分的萃取:环形离心萃取(ACE)和离心分配萃取(CPE)。比较了每个实验的所得数据,包括产率、时间和溶剂消耗,结果表明就溶剂消耗而言,CPE是最有效的技术。使用离心分配色谱(CPC)在半制备和制备规模上实现了木脂素的分离。用于此目的的双相系统由以下溶剂组成:正己烷/乙酸乙酯/乙醇/水,比例为2:3:3:2(v/v/v/v),并实现了两种主要木脂素芝麻素和芝麻林素的直接回收。同时,CPC分析还分离出了芝麻油中的四种次要木脂素,即芝麻明、芝麻酚、芝麻素醇和表芝麻素醇。分离得到的木脂素的结构解析基于高分辨质谱/质谱(HRMS/MS)和核磁共振(NMR)实验。采用高效液相色谱(HPLC)对所得提取物进行定量分析,以确定分离得到的化合物的纯度。本研究结果表明,回收得到的芝麻素和芝麻林素纯度高于95%,验证了所提出的分离方法的有效性。最后,由于芝麻油在化妆品行业的广泛应用,对所有纯化合物的酪氨酸酶、弹性蛋白酶、胶原酶和透明质酸酶抑制活性进行了评估。