Ethyl acetate

There are many different methods for developing latent fingerprints. Some work better on non-porous surfaces, while others work best developing prints on porous surfaces. Some are destructive preventing testing the object for other forensic evidence while others are non-destructive. In order to make prints visible on porous surfaces, forensic scientists use one of three methods; Silver Nitrate, Ninhydrin and Iodine fuming. These three methods are known to be the most effective ways for…

The purpose of this lab was to synthesize acetanilide and use recrystallization to isolate the acetanilide product from small amounts of impurities, acetic acid. Recrystallization is a very effective way for organic chemists to isolate a solid product from a small amount of impurities but cannot be used for liquids. The crude acetanilide product and the recrystallized acetanilide were compared using melting point determination and the recrystallized product was then classified and checked for…

1. Materials and suppliers • Caffeine (anhydrous), BASF, Germany, was generously donated by Dar Al Dawa Development and Investment Company. Caffeine is 1,3,7-trimethyl-3,7-dihydro-1H-purine-2,6-dione. It is white or almost white, crystalline powder or silky crystals. It is sparingly soluble in water, freely soluble in boiling water and slightly soluble in ethanol. It is used as central nervous system stimulant (British Pharmacopoeia 2009). • Methyl paraben was generously donated by Arab…

(40 µL). The reaction flask was covered with an aluminum foil and left stirring at high rate of speed for 24 h. At the end of the reaction, the dark powder was aggregated at the bottom of the flask. The collected powder was washed with bi-solvent of ethyl ether and distilled water-DI (10 mL each), followed by washing step with 10% HCl, saturated aqueous…

Defatted and dried sample (2.0 g) was ground separately and refluxed with 20.0 ml of 80% ethyl alcohol for 6.0 h. The extracts was filtered and made up to 25 ml. The samples (0.2 and 0.4 ml) and standard glucose (0.2-1.0 ml from 0.1mg/ml D-glucose stock) were taken in a series of test tubes and the volume was made up to 1.0 ml. A reagent blank…

3. Results and discussion 3.1. Qualitative and quantitative phytochemical analysis Preliminary phytochemical screening of the aqueous extract of both CBE and CQE showed the presence of alkaloids, flavonoids, reducing sugar, phenols, steroids like terpenoids and saponins (Table 1), whereas tannins are absent. Table 2. shows the quantitative analysis of phytochemicals of CBE and CQE. The concentration of phyto-constituents varied between the plants and also within the plant. The total steroid…

Raju Chandra et al; A reliable and reproducible reversed-phase high performance liquid chromatography (RP-HPLC) was developed for the quantitative determination of quetiapine fumarate from marketed bulk tablets. The active ingredient of quetiapine fumarate separation achieved with C18 column using the methanol water mobile phase in the ratio of 30:70 (v/v). The active ingredient of the drug content quantify with UV detector at 359 nm. The retention time of quetiapine fumarate is 5.27 min. A good…

substance. It is operated similarly to paper chromatography. Materials Silica Plate, Tweezers & Gloves, Pencil & Ruler Unknown Dye (X), Unknown Dye (Y) & Unknown Dye (X & Y) 3 Pasteur Pipettes & UV Light (Ultra-Violet) Jar or Beaker with Lid Solvent (Ethyl Acetate-Hexane [1:1] is most…

A small burette funnel was filled with column packing solvent at mobile phase, high boiling petroleum, in this case hexane (and then 10%acetone hexane mixture), and Alumina as stationary phase. When adding the sand and the alumina they have to be first mixed with the hexanes in order not to disturb the column. The Lycopene is Red- Orange and more attracted to alumina due to its high degree of Unsaturation, which can be expected to be eluted after Yellow-Orange Carotene pigments. And the other…

6(a-j) A solution of compound 5(a-j) and DIPEA (mole ratio 1: 2) in anhydrous toluene was refluxed for 2 hr. After cooling to room temperature, POCl3 was added and heating was continued for further 4-6 hr. The solution was cooled and diluted with ethyl acetate; organic layer was separated and concentrated to obtain the solid desired compounds, filtered, washed with water, dried in vacuum and recrystallized with carbinol. N-Benzylidene-4-chloro-2-phenylquinazolin-3-(4H)-amine…