Ultrasonic-Assisted Extraction, Comparative Chemical Composition and Biological Activities of Essential Oils of Fresh and Dry Aboveground Parts of Artemisia annua L.

2018 ◽  
Vol 21 (6) ◽  
pp. 1624-1635 ◽  
Author(s):  
Yichao Wu ◽  
Xiaobo Jiang ◽  
Li Zhang ◽  
Yonghong Zhou
2018 ◽  
Vol 20 (3) ◽  
pp. 713-723 ◽  
Author(s):  
Yongqiang Zhang ◽  
Phongphat Prawang ◽  
Chunshan Li ◽  
Xiangzhan Meng ◽  
Yu Zhao ◽  
...  

An efficient and environmentally friendly process for artemisinin extraction using monoether as the solvent under ultrasonic irradiation has been developed.


2011 ◽  
Vol 56 ◽  
pp. 45-56 ◽  
Author(s):  
Bujar Qazimi ◽  
Marija Karapandzova ◽  
Gjose Stefkov ◽  
Svetlana Kulevanova

Chemical composition of n-hexane extracts obtained from dried over-ground parts of two species of Sideritis, S. scardica Grieseb. and S. raeseri Boiss. & Heldr. (Lamiaceae) was analyzed using GC/FID/MS. The collection of plants was made on different locations in the western part of Macedonia and the southern part of Albania, comprising twelve different samples of plant material. The ultrasonic-assisted extraction process was used for preparation of the n-hexane extracts yielded 0.73-3.33 % and 9.11-10.44 % of extracts for S. scardica and S. raeseri, respectively. Over one hundred constituents of the extracts were identified, belonging to several classes of components: diterpenes, hydrocarbons, dominantly present in each of the extracts, followed by fatty acids, aliphatic and aromatic alcohols, sterols, triterpene alcohols, and monoterpenes and sesquiterpenes, which were found in much smaller amounts or only in traces. The most abundant constituents of the extracts of both species of Sideritis were two diterpene components, both with M=286, which were not fully identified. Large percentages of nonacosane (1.71-12.22% and 7.46-19.68% for S. scardica and S. raeseri, respectively) and hentriacontane (4.48-20.79% and 8.09-30.31 % for S. scardica and S. raeseri, respectively) were also found in the extracts of both species.


Antioxidants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 607
Author(s):  
Anca Pop ◽  
Ionel Fizeșan ◽  
Laurian Vlase ◽  
Marius Emil Rusu ◽  
Julien Cherfan ◽  
...  

The extraction of bioactive compounds present in walnut (Juglans regia L.) male flowers (WMFs) was performed based on an experimental design using ultrasonic-assisted extraction. Solvent nature, extraction time, and water content were selected as experimental variables, and phenolic, flavonoidic, and condensed tannins contents and antioxidant properties were evaluated. Acetone was the solvent with the highest extraction performance, with the extracts obtained using this solvent displaying an increased concentration of bioactive compounds and increased antioxidant activities. For several extracts with high bioactive content, individual polyphenolic and tocopherolic compounds were evaluated by means of LC-MS and LC-MS/MS. The best extraction conditions for polyphenolic (2.86 mg gallic acid equivalents/g WMF) and tocopherolic compounds (29.4 µg/g WMF) were acetone with 40% water content (N20) and acetone with 20% water content (N15), respectively. Although the total tocopherol concentrations were lower than in other Juglans regia parts, most of the total tocopherol quantity was provided by the highly biologically active δ-tocopherol (84%). Significant quantities of quercetin (101.9 µg/g), hyperoside (2662.9 µg/g), quercitrin (405.7 µg/g), and isoquercitrin (1293.7 µg/g) were determined in WMF (N20). Both extracts inhibited the enzymatic activity of α-glucosidase and tyrosinase; however, an increased inhibition was observed for N20, the extract with the higher polyphenolic content. Conversely, N15 had higher anticancerous activity on the cell lines used, with a moderate selectivity towards the cancerous phenotype being observed for both extracts. At non-cytotoxic concentrations, both extracts displayed good antioxidant activities in cellular cultures, decreasing basal and H2O2-induced oxidative stress. This is the first characterization of both hydrophilic and lipophilic phytochemicals in WMF extracts. The outcomes of our study reveal that walnut male flowers have strong biological activities, thus justifying further research to demonstrate their usefulness in the food, pharmaceutical, and/or cosmetic industries.


2019 ◽  
Vol 141 ◽  
pp. 431-443 ◽  
Author(s):  
Rehebati Nuerxiati ◽  
Aytursun Abuduwaili ◽  
Paiheerding Mutailifu ◽  
Atikan Wubulikasimu ◽  
Nigora Rustamova ◽  
...  

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