Abstract Willofleaf cotoneaster ( Cotoneaster salicifolius Franch.) is a low, prostrate shrub, grown in Romania as an ornamental plant. Its fruits are small, ovoid pomes. Fruit tissues were analyzed for total carotenoid content (through acetone extraction and spectrophotometry), flavonoid (methanol spectrophotometry) concentration of phenolic polyphenolic compounds spectrophotometric Folin-Cioc...

Various aspects of application of derivative spectrophotometry in chemical analysis and in investigations of equilibria and kinetics of reactions are scrutinized. The presented paper provides useful information about state-of-the-art and possibilities offered by derivative spectrophotometry in pharmaceutical, clinical or environmental fields of analysis.

Methods In this study, the VHC called Tipshaler (Protec’som, France) was evaluated with fluticasone (Flixotide, 50μg/dose, GSK, France) and beclomethasone (QVAR, 100μg/dose, MEDICIS, Canada). The method according to the European Pharmacopoeia used a constant flow rate (30 L / min) was used. Particle size distribution was measured using a NGI cascade impactor (Copley Scientific, Nottingham, Unit...

An extraction method is described for quantitatively determining Mg, K, Na, 2n, and Mn in plant tissues. The tissue is extracted with 2% trichloroacetic acid and the elements are determined on the filtrate by atomic absorption spectrophotometry. Results compare favorably with those determined after wet ashing with nitric and perchloric acids. In addition, trichloroacetic acid extracts the same ...

A fast and low-cost analytical method to determine the concentrations of carotenoids (β-carotene, lutein, lycopene) from mixed standard solutions or fruit extracts (kiwi fruits, tomato paste, pink grapefruit juice, kiwi-pineapple smoothie, apricot nectar) was tested. The methodology based on UV-Vis spectrophotometry Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS). Results show...

Vancomycin, an important antibiotic, is marketed as lyophilized powder. In the context of routine analysis this product, existence a more advantageous and effective method interesting. Thus, objective work to develop validate new analytical method, faster, low-cost, ecological miniaturized for quantification vancomycin in powder using spectrophotometry ultraviolet region. Buffer solution pH 6.8...