Претраживање
Приказ резултата 1-10 од 25
Synthesis of new stereoisomeric nitrate esters derived from isosorbide-mononitrates
(Freund Publishing House Ltd, London, 2001)
A synthesis of diastereomeric (7R) 7-endo-nitrooxy-3-oxo-2,5,9-trioxabicyclo[4.3.0]nonane (4b) and (7S) 7-exo-nitrooxy-3-oxo-2,5,9-trioxabicyclo[4.3.0] (7b) is described using D-glucitol as a starting compound. Bicyclic ...
Derivative spectrophotometric method for determination of acidity constants of single step acid-base equilibria
(Elsevier Science BV, Amsterdam, 2001)
A general derivative spectrophotometric method for determination of acidity constants is developed. The method appears suitable in cases when classical spectrophotometry cannot be employed due to little differences in the ...
Essential oil of Abies alba Mill., Pinaceae, from the pilot production in Montenegro
(Allured Publ Corp, Carol Stream, 2001)
The analyses were performed on the commercial essential oil of Abies alba obtained from fresh green summits of young branches by steam distillation. The plant material was collected from the teritory of Montenegro. The ...
Influence of pH and agitation intensity on drug dissolution from tablets evaluated by means of factorial design
(ECV-Editio Cantor Verlag Medizin Naturwissenschaften, Aulendorf, 2001)
Dissolution rate of a drug substance can be strongly influenced by the experimental conditions employed, among which agitation intensity and pH value were recognized as the most Important. A complete two-factor, three-level ...
Chemical compositions of two wild species of the genus Salvia L. from Yugoslavia: Salvia aethiopis and Salvia verticillata
(Allured Publ Corp, Carol Stream, 2001)
We compared two wild Salvia species found in Yugoslavia: S. aethiopis L. and S. verticillata L. Both oils contained beta-caryophyllene as main constituent (27.5% and 13.3%, respectively), but differed by the presence of ...
The high-performance thin-layer chromatographic determination of dexamethasone and xylometazoline in nasal drops containing different preservatives
(Springer Nature, 2001)
A simple and reliable HPTLC method has been developed and validated for the determination of dexamethasone (as the sodium phosphate salt) and xylometazoline (as the chloride). Assay of the compounds was performed on silica ...
Synthesis of new stereoisomeric nitrate esters derived from isosorbide-mononitrate II: Bicyclic delta-lactams and tetrahydrofuran derivatives
(Georg Thieme Verlag, 2001)
The synthesis of the diastereomeric nitrate esters (3R,4R)-(2-hydroxy-4-nitrooxytetrahydrofuran-3-yloxy)acetonitrile (5b) and (3R,4S)-(2-hydroxy-4-nitrooxytetrahydrofuran-3-yloxy)acetonitrile (9) was achieved by the Beckmann ...
The use of a response surface methodology on HPLC analysis of methyldopa, amiloride and hydrochlorothiazide in tablets
(Pergamon-Elsevier Science Ltd, Oxford, 2001)
A multifactor optimisation technique is successfully applied to develop a new HPLC method in which methyldopa, hydrochlorothiazide and amiloride were analysed and determined on a C18 column with detection at 286 nm. The ...
A preliminary study of beta-cyclodextrin/metoprolol tartrate inclusion complex for potential enantiomeric separation
(Pergamon-Elsevier Science Ltd, Oxford, 2001)
The inclusion complex formation between Metoprolol tartarata (MeT) and beta -cyclodextrin (beta -CD) has been investigated using hyperchromic shift at lambda (max) 274.4 nm of MeT. Different parameters such as stirring ...
Composition of the essential oils of seven Teucrium species from Serbia and Montenegro
(Allured Publ Corp, Carol Stream, 2001)
The essential oils of seven Teucrium species (T. arduini L., T. botrys L., T. chamaedrys L., T. flavum. L., T. montanum L., T. polium L., T. scordium L.) growing wild in Serbia and Montenegro were studied by GC and GC/MS. ...