Pharmacie sans ordonnance livraison rapide 24h: acheter viagra en ligne en France.
Mongolian Journal of Biological Sciences 2008 Vol. 6(1-2): 45-49
Calculation of Quantitative Structure-Activity Relationship Descriptors
of Artemisinin Derivatives
Jambalsuren Bayarmaa1 and Vladimir Frecer2
1Department of Biochemistry and Bioorganic Chemistry, Faculty of Biology, National University of Mongolia
2Area of Pure and Applied Chemistry, International Center for Sciense and High Technology-UNIDO,
Trieste, Italy E-mail: email@example.com
Quantitative structure-activity relationships are based on the construction of predictive models using
a set of known molecules and associated activity value. This accurate methodology, developed with adequate mathematical and computational tools, leads to a faster, cheaper and more comprehensive design of new products, reducing the experimental synthesis and testing on animals. Preparation of the QSAR models of artemisinin derivatives was carried out by the genetic function algorithm (GFA) method for 91 molecules. The results show some relationships to the observed antimalarial activities of the artemisinin derivatives. The most statistically signifi cant regression equation obtained from the fi nal GFA relates to two molecular descriptors.
molecular model, descriptor, QSAR technique, artemisinin derivatives
Artemisinin and its derivatives are only the group of compounds that is still effective against drug-
Malaria is one of the most serious parasitic resistant P. falciparum
strains, and has the ability
diseases in the world. There are millions of acute
to quickly reduce parasite level (Krishna, 2004).
cases of malaria each year globally, resulting in
From the other side, it has short plasma half-life,
more than one million deaths. The clinical disease
limited bioavailability, poor solubility in oil and
caused by Plasmodium falciparum
is widely water, and the low yield from natural sources distributed and entrenched in areas of the world
where climates are suitable for its transmission.
to develop new chemotherapeutic artemisinin
The present level of annual global malaria incident
derivatives. By the chemical modifi cation of
consisted of about 500 million, 350 million in the
artemisinin at the position of C10 semisynthetic
African region and 125 million in the South East
derivatives as artesunate, artemether, artelinic
Asian region. Deaths due to malaria are occurring
acid and dihydroartemisinin were produced,
in increasing numbers because of frequent failure
which have more antimalarial activities in
of the conventional treatments using drugs such
than artemisinin itself (Pinheiro, 2003).
as chloroquine, mefl oquine and sulfadoxine-
Many derivatives have been synthesized using
pyrimethamine, against P. falciparum
, the dihydroartemisinin by adding different radicals populations of which have developed a high on its rings. But, the development of a new drug is degree of resistance.
a very long and expensive process. To overcome
Combination therapies with formulations these diffi culties scientists start to use a variety
containing an artemisinin compound have of computational methods to identify novel emerged as a more reliable treatment option. compounds, design compounds with increased Artemisinin is naturally formed in Artemisia
selectivity, effi cacy and safety and develop
(sweet wormwood). This herb of the
compounds into clinical trial candidates. One
Asteraceae family has been used for treatment of these methods is the Quantitative Structure-of fever and malaria in China over many Activity Relationship (QSAR) technique. The centuries. Additional names found in China for
present work is related to the design of a new
artemisinin are qinghaosu and huanghuahaosu. antimalarial active artemisinin analog.
Psychiatric Evaluation Intake Form 1. Patient Contact Information Patient Name ________________________ Address ____________________________________________Best contact phone number ____________________ Email address ________________________________Emergency contact ________________ Relationship _______________ Phone No ____________________ Primary Care Physician _____________________
Amour et Spina Bifida en communication avec le public. Trois points semblent très importants à développer en ce qui concerne la vie affective et sexuelle de la personne atteinte de spina-bifida : - Premièrement, il est important de dire et de répéter que rencontrer un partenaire et vivre heureux en couple est possible. C’est vrai. J’ai rencontré de nombreux couples dont l’