Purification of Artemisinin fromArtemisia annuaExtract by Sorption on Different Ligand Loaded Polymeric Adsorbents Designed by Molecular Simulation

Assessment of artemisinin and antioxidant activities of three wild Artemisia species of Algeria

Artemisinin, a natural product, has received considerable attention in the last few years as a potent antimalarial drug.This study reports the presence of Artemisinin in three Algerian wild Artemisia species assessed by HPLC method: A. herba-alba (AH), A. campestris subsp. glutinosa (AC), and A. judaica subsp sahariensis (AJ).The HPLC analysis of the hexane extracts, showed a difference in artemisinin content in studied species with a yield of 0.64%, 0.34% and 0.04% for AC, AH and AJ, respectively. Moreover, the level of artemisinin obtained in A. campestris was better than those found in A. sieberi and A. annua. This rate has been reported for the first time.Furthermore, the antiradical activities of methanolic extracts of plants were also tested. There was a remarkable antioxidant capacity found in all Artemisia methanolic extracts analysed.

Assessment of Artemisinin Contents in Selected Artemisia Species from Tajikistan (Central Asia)

Background: Central Asia is the center of origin and diversification of the Artemisia genus. The genus Artemisia is known to possess a rich phytochemical diversity. Artemisinin is the shining example of a phytochemical isolated from Artemisia annua, which is widely used in the treatment of malaria. There is great interest in the discovery of alternative sources of artemisinin in other Artemisia species. Methods: The hexane extracts of Artemisia plants were prepared with ultrasound-assisted extraction procedures. Silica gel was used as an adsorbent for the purification of Artemisia annua extract. High-performance liquid chromatography with ultraviolet detection was performed for the quantification of underivatized artemisinin from hexane extracts of plants. Results: Artemisinin was found in seven Artemisia species collected from Tajikistan. Content of artemisinin ranged between 0.07% and 0.45% based on dry mass of Artemisia species samples. Conclusions: The artemisinin contents were observed in seven Artemisia species. A. vachanica was found to be a novel plant source of artemisinin. Purification of A. annua hexane extract using silica gel as adsorbent resulted in enrichment of artemisinin.

Experimental and DFT studies for selective separation of Sb(iii) and Sb(v) from mixtures with Zr(iv)/Co(ii) using thiourea grafted polystyrene adsorbent

The ‘S’ atom of thiourea functionalized polystyrene adsorbent exhibited very strong interaction with excellent separation of antimony(iii and v) ions in presence of large concentration of cobalt and zirconium ions.

DFT studies for the evaluation of amine functionalized polystyrene adsorbents for selective adsorption of carbon dioxide

The current study provides molecular-level insights into the CO₂–amine functionalized polystyrene complexes, enabling design of newer CO₂ selective adsorbents.