alpha-Dihydroartemisinin
Dihydroartemisinin is widely used as an intermediate in the preparation of other artemisinin-derived antimalarial drugs, is recommended as the first-line anti-malarial drug with low toxicity. Dihydroartemisinin possesses promising anticancer activities and induce cancer cell death through apoptotic pathways.
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Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
Need more advice on solubility, usage and handling? Please email to: service@chemfaces.com
The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
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J Chromatogr B Analyt Technol Biomed Life Sci. 2008 Nov 1;875(1):180-91.
On-column epimerization of dihydroartemisinin: an effective analytical approach to overcome the shortcomings of the International Pharmacopoeia monograph.[Pubmed:
18617445]
We developed a cryo-HPLC/UV method for the simultaneous determination of artemisinin (1), alpha-Dihydroartemisinin (2alpha), beta-dihydroartemisinin (2beta), and a ubiquitous thermal decomposition product of 2 (designated as diketoaldehyde, 3), starting from the International Pharmacopoeia monograph on dihydroartemisinin. The method takes for the first time the on-column epimerization process of 2 into consideration. Chromatographic separation was obtained under reversed-phase conditions on a Symmetry C18 column (3.5 microm particle size) with a mobile phase consisting of acetonitrile-water 60:40 (v/v), delivered at 0.60-1.00 ml/min flow-rates, with ultraviolet detection at low wavelength (lambda = 210 nm).
CONCLUSIONS:
Low temperatures (T = 0-10 degrees C) were selected on the grounds of a diastereoselective dynamic HPLC (DHPLC) study performed at different temperatures, aimed at identifying the best experimental conditions capable of minimizing the on-column interconversion process.
