Termoestabilidade de processos extrativos de Nasturtium officinale R. Br., brassicaceae por sistema Soxhlet modificado

This work had as objective verified the term-stability of the Soxhlet modified system with analytical and pharmacothecnical application in extractive processes of Nasturtium officinale. It has proven that the process is thermo-stable. The analysis with analytical have determined 3.606 mg g-1 in chlorogenic acid and 11.813 mg g-1 in rutin (extract 1:20 w/v) and with pharmacotecnical 3.427 mg g-1 in chlorogenic acid and 11.278 mg g-1 in rutin (extract 1:6 w/v). The income of the pharmacothecnical process was inferior to the analytical, suggesting that the pharmacothecnical process would need of at least the double of time in each extraction system.

Cosmos : revue encyclopédique hebdomadaire des progrès des sciences / fondée... par M. B. R. de Monfort ; rédigée par M. l'abbé Moigno

1867/10 (SER3,T1).

Cosmos : revue encyclopédique hebdomadaire des progrès des sciences / fondée... par M. B. R. de Monfort ; rédigée par M. l'abbé Moigno

1868 (SER3,T3).

Cosmos : revue encyclopédique hebdomadaire des progrès des sciences / fondée... par M. B. R. de Monfort ; rédigée par M. l'abbé Moigno

1869/07/03 (A18,SER3,T5)-1869/09/25.

Cosmos : revue encyclopédique hebdomadaire des progrès des sciences / fondée... par M. B. R. de Monfort ; rédigée par M. l'abbé Moigno

1870/07/02 (A19,SER3,T7)-1870/08/27.

Parâmetros r e R obtidos de programa interlaboratorial: como usá-los

Intralaboratorial and interlaboratorial variabilities can be obtained by conducting an specially designed interlaboratory program. Using the analysis of variance technique one can calculate the r (repeatability) and R (reproducibility) indexes that can help participant laboratories to monitor their routine quality control procedures. An example is described using data obtained from an interlaboratory program where twelve laboratories determined total iron content in silicon metal sample by using flame atomic absorption spectrometry.

Om rå-pottaske tilwärkningens uphjelpande i Finland

Invocatio: M.G.H.

Tractatus R. Maimonidis de sepultura animalium

Dedicatio: Johannes Arenius [lat. pr. & hepr. runo].

Constituintes químicos de Hyptidendron canum (Pohl ex Benth.) R. Harley (Lamiaceae)

Chemical investigation of Hyptidendron canum stems resulted in the isolation of betulinic, ursolic and euscaphic acids. From the leaves were isolated 3β-O-β-galactopiranosilsitosterol, ursolic aldehyde, and mixtures of maslinic acid and 2α-hydroxyursolic acid, α and β-amyrin, uvaol and erythrodiol, sitosterol and stigmasterol, spathulenol and globulol. Hexane and chloroform leave fractions as well as ursolic and betulinic acids showed antifungal activities against the yeast form of Paracoccidioides brasiliensis.

Spectrophotometric determination of catecholamine using vanadium and eriochrome cyanine r

A highly sensitive spectrophotometric method for the analysis of catecholamine drugs; L-dopa and methyldopa, is described. The analysis is based on the reaction of drug molecules with vanadium (V) which is reduced to vanadium (IV) and form complex with eriochrome cyanine R to give products having maximum absorbance (lmax) at 565 nm. Beer's law is obeyed in the range 0.028-0.84 and 0.099-0.996 mg mL-1 for L-dopa and methyldopa, respectively. The statistical analysis as well as comparison with reported methods demonstrated high precision and accuracy of the proposed method. The method was successfully applied in the analysis of pharmaceutical preparations.