Zobrazeno 1 - 10
of 26
pro vyhledávání: '"M. S. Karawya"'
Publikováno v:
ChemInform. 26
Publikováno v:
Planta Medica. 38:73-78
Publikováno v:
Scopus-Elsevier
~~~~~~~~~~~~~~~~ ~~~~~~~~-medica Abstract The polysaccharides of stems of Opuntia Jicusindica, seeds of T amarin dus indica and seeds of Cydonia oblonga were found to consist of a mixture of mucilage and pectin. The preparation of each polysacchari
Publikováno v:
Planta Medica. 21:173-176
Publikováno v:
Journal - Association of Official Analytical Chemists. 58(1)
Two colorimetric methods are described for the estimation of strychnine and brucine in nux vomica. The first is a modification of the Karawya and Ghourab method for the determination of strychnine, in which the sensitivity of the color is increased b
Autor:
M S, Karawya, A M, Diab
Publikováno v:
Journal - Association of Official Analytical Chemists. 58(6)
In the method described the amide group in the colchicine molecule is reduced with lithium aluminum hydride to the corresponding secondary amine. The latter is extracted with chloroform and then determined either colorimetrically by the copper dithio
Publikováno v:
Journal - Association of Official Analytical Chemists. 58(5)
Two colorimetric micromethods are described for the determination of atropine-hyoscyamine and hyoscine (scopolamine), using p-dimethylaminobenzaldehyde and citric acid-acetic anhydride as the color reagents. These methods are sensitive to 60-1200 and
Publikováno v:
Journal - Association of Official Analytical Chemists. 59(4)
A sensitive method is presented for determining aconitine. Aconitine is complexed with Co2+, the aconitine-cobalt complex is extracted with chloroform, and the absorbance is measured at 320 nm. The sensitivity of the method ranged between 0.06 and 3
Autor:
M S, Karawya, A M, Diab
Publikováno v:
Journal - Association of Official Analytical Chemists. 58(6)
The proposed method is based on the reaction of salsolidine HCl with carbon disulfide and ammoniacal copper sulfate. The resulting salsolidine-copper-dithiocarbamate complex is extracted with benzene and measured spectrophotometrically at 448 nm. The
Publikováno v:
Die Pharmazie. 29(1)