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Acalypha Wilkesiana 'Java White': Identification of Some Bioactive Compounds by Gc-Ms and Their Effects on Key Enzymes Linked to Type 2 Diabete. ACTA PHARMACEUTICA 2018; 68:425-439. [PMID: 31259705 DOI: 10.2478/acph-2018-0037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 08/29/2018] [Indexed: 12/22/2022]
Abstract
In this study, we identified bioactive compounds from the ethanolic extracts of the leaves, stem bark and root bark of Acalypha wilkesiana through GC-MS analysis and investigated the effects of these extracts on some of the enzymes linked to type 2 diabetes. Plant parts were extracted sequentially with ethyl acetate, ethanol and water. GC-MS analysis revealed the presence of long-chain alkyl acids, esters, ketones and alcohols including phytol and phytol acetate along with some secondary metabolites such as xanthone, vitamin E and various types of sterols including stigmasterol, campesterol and sitosterol. Ethanolic extracts of all the parts showed a dose- -dependent inhibition of α-glucosidase and α-amylase activity. The extracts also demonstrated anti-lipase activity. The ethanolic extract of root bark showed the highest inhibition of enzymes compared to other extracts. The EC50 values (concentrations for 50 % inhibition) of α-glucosidase, α-amylase and lipase inhibition were 35.75 ± 1.95, 6.25 ± 1.05 and 101.33 ± 5.21 μg mL-1, resp. The study suggests that A. wilkesiana ethanolic extracts have the ability to inhibit the activity of enzymes linked to type 2 diabetes. Further studies are needed to confirm the responsible bioactive compounds in this regard.
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Yang X, Wang N, Shen C, Li H, Zhao J, Chen T, Li Y. An effective method based on medium-pressure liquid chromatography and recycling high-speed counter-current chromatography for enrichment and separation of three minor components with similar polarity from Dracocephalum tanguticum. J Sep Sci 2018; 42:684-690. [PMID: 30488652 DOI: 10.1002/jssc.201800812] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 10/20/2018] [Accepted: 11/18/2018] [Indexed: 01/08/2023]
Abstract
The separation of minor compounds, especially those with similar polarities from a complex sample, remains challenging. In the proposed study, an effective method based on medium-pressure liquid chromatography and recycling high-speed counter-current chromatography was developed for the enrichment and separation of three minor components from Dracocephalum tanguticum. The crude extract was directly introduced to medium-pressure liquid chromatography for the enrichment of the three minor components. Based on high-performance liquid chromatography analysis, the total content of these three compounds increased from 0.48% in the crude extract to 85.3% in the medium-pressure liquid chromatography fraction. In addition, high-speed counter-current chromatography was employed to separate the enriched compounds using the solvent system hexane/ethyl acetate/methanol/water (1.18:8.82:1.18:8.82, v/v/v/v). As a result, compound 3 and a mixture of compounds 1 and 2 were obtained. In order to improve the resolution of compounds 1 and 2 while saving separation time, a recycling and heart-cut mode was used. Finally, compounds 1 and 2 were obtained after five cycles. These compounds were identified as 3-phenylethyl β-d-glucopyranoside (1), tazettoside E (2), and cirsiliol-4'-glucoside (3). Compounds 1 and 2 were primarily separated from D. tanguticum. Moreover, the developed method provided a reference for the separation of minor components from the complex sample.
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Affiliation(s)
- Xue Yang
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China.,Savaid Medical School, University of the Chinese Academy of Sciences, Beijing, P. R. China
| | - Nana Wang
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China.,Savaid Medical School, University of the Chinese Academy of Sciences, Beijing, P. R. China
| | - Cheng Shen
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China.,Savaid Medical School, University of the Chinese Academy of Sciences, Beijing, P. R. China
| | - Hongmei Li
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China.,Savaid Medical School, University of the Chinese Academy of Sciences, Beijing, P. R. China
| | - Jingyang Zhao
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China
| | - Tao Chen
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China
| | - Yulin Li
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Chinese Academy of Science, Northwest Institute of Plateau Biology, Xining, P. R. China
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