Papers by ALESSANDRA GOMES CIOLETTI
Journal of the Brazilian Chemical Society, 2005
... Raphael SF Silva I ; Tiago T. Guimarães I ; Daniel V. Teixeira I ; Ana Paula G. Lobato I ; Ma... more ... Raphael SF Silva I ; Tiago T. Guimarães I ; Daniel V. Teixeira I ; Ana Paula G. Lobato I ; Maria do Carmo FR Pinto I ; Carlos Alberto de Simone II ; Janaína G. Soares II ; Alessandra G. Cioletti II ; Marilia ... 6. Wang, WY; Preville, P.; Morin, N.; Mounir, S.; Cai, WZ; Siddiqui, MA; Bioorg. ...
Talanta, 2008
The present work describes the development of an amperometric sensor based on hemin immobilized o... more The present work describes the development of an amperometric sensor based on hemin immobilized on a titanium oxide modified silica toward detection of artemisinin (ARN) in neutral medium at an applied potential of −0.5 V vs. Ag/AgCl. The sensor presented its best performance in 0.1 mol L −1 phosphate buffer solution, at pH 7.0. After optimizing the operational conditions, the sensor provided a linear response range for ARN reduction from 50 nmol L −1 to 1000 nmol L −1 with a sensitivity, detection and quantification limits of 24.66 A L mol −1 , 15 nmol L −1 and 52 nmol L −1 , respectively. The proposed sensor showed a stable response for at least 80 successive determinations. The repeatability of the measurements with the sensor and the preparation of a series of electrodes, evaluated in terms of relative standard deviation, were 4.1% and 5.0%, respectively, for n = 10. The developed sensor was applied for the determination of ARN in the crude extracts of A. vulgaris L and the average recovery for these samples is 101.4 (± 3.1)%.
Synthetic Communications, 2000
A simple and inexpensive methodology for the selective hydrolysis of acetals using hydrogen chlor... more A simple and inexpensive methodology for the selective hydrolysis of acetals using hydrogen chloride as catalyst is described.
Journal of the Brazilian …, 2005
... Raphael SF Silva I ; Tiago T. Guimarães I ; Daniel V. Teixeira I ; Ana Paula G. Lobato I ; Ma... more ... Raphael SF Silva I ; Tiago T. Guimarães I ; Daniel V. Teixeira I ; Ana Paula G. Lobato I ; Maria do Carmo FR Pinto I ; Carlos Alberto de Simone II ; Janaína G. Soares II ; Alessandra G. Cioletti II ; Marilia ... 6. Wang, WY; Preville, P.; Morin, N.; Mounir, S.; Cai, WZ; Siddiqui, MA; Bioorg. ...
Zeitschrift für Kristallographie - New Crystal Structures, 2006
ABSTRACT
Tetrahedron Letters, 2003
Peroxidation of the phenazine of b-lapachone using m-ClC 6 H 4 CO 3 H/CH 2 Cl 2 furnished a macro... more Peroxidation of the phenazine of b-lapachone using m-ClC 6 H 4 CO 3 H/CH 2 Cl 2 furnished a macrolactone with a rigid 10-membered ring, and the corresponding N-oxide, originating from the oxidative cleavage of the aromatic double bond at the site of fusion of the dihydropyrane moiety with the phenazine component. A third compound, a dihydrobenzophenazine-5-one, was also generated probably by hydrolysis of an intermediate epoxide-acetal or a-hydroxy-hemiacetal formed at the same site. All of the new compounds were fully characterized by X-ray diffractometry and spectroscopic methods.
Zeitschrift für Kristallographie - New Crystal Structures, 2000
ABSTRACT
Synthetic …, 2000
A simple and inexpensive methodology for the selective hydrolysis of acetals using hydrogen chlor... more A simple and inexpensive methodology for the selective hydrolysis of acetals using hydrogen chloride as catalyst is described.
Uploads
Papers by ALESSANDRA GOMES CIOLETTI