Ethyl acetate

A commonly used method to extract caffeine from a substance was a process that used dichloromethane. Dichloromethane and another chemical called ethyl acetate were commonly use because of caffeines' polarity and solubility. Caffeine is much more soluble in dichloromethane than in water because dichloromethane is considered a polar hydrocarbon because of its structure and elements that it contains. Caffeine…

These materials were Whole milk, 10% acetic acid, coffee filters, ethyl acteate, 1% glucose solution, Fehling’s solution, Biuret’s test solution (.5% CuSO4), 10% NaOH, lactose, lactase, glucose test solution, ammonium molybdate solution, funnels, .1% ammonium oxalate solution, beakers (different sizes) , flasks(Erlenmeyer…

active ingredient in Advil. Therefore, in Procedure 1 TLC trials were ran for acetaminophen, aspirin, caffeine, and ibuprofen in different mobile phases composed of various proportions of ethyl acetate and hexane. The Rf values were recorded in Table 1. Based on this data, a mobile phase composed of 80% ethyl acetate and 20% hexane was selected, for it provided a Rf value significantly greater than 0 for all analgesics and showed a decent amount of separation. This is vital in TLC because it is…

Synthesis and NMR Spectroscopy of ethyl cinnamate Introduction: Wittig reactions involve the stereoselective synthesis of olefins from phosphonium ylides and aldehydes or ketones, where the carbonyl bond is converted to an alkene double bond.1 The variety of suitable reagents and the relatively mild experimental conditions facilitate their industrial applications, such as the synthesis of epoxides, esters, carotenoids and vitamin A.2,3 Specifically, the ester ethyl cinnamate is used as a…

as a bulk drug and in formulation, was developed and validated according to ICH guidelines. The method employed HPTLC aluminium plates precoated with silica gel 60F-254 as the stationary phase while the solvent consisted of Toluene: Methanol: Ethyl acetate (8:2:0.1 v/v/v). The system was found to give compact spot for drug (Rf value of Cilnidipine and Chlorthalidone was 0.75 and 0.47 respectively). Densitometric analysis of Cilnidipine and Chlorthalidone were carried out in the absorbance mode…

OBJECTIVE For the first week of the lab, the objectives were to isolate and test for the presence of major components of milk, including proteins, carbohydrates, fats, vitamins, and minerals and to determine the presence of the various components of milk in the various fractions using qualitative tests for these substances. For the second week of the lab, the there were three objectives that related to the procedure: to determine the calcium concentration of milk using the technique of…

Previously, for the first part of the experiment, it was hypothesized that the retention times of the eluates were invariably associated with the polarity of the compound; the more non-polar the compound, the faster it would be eluted out of the gas chromatogram. It was also hypothesized that the retention times decreased as the temperature in the gas column increased. In the first part of the experiment the relationship between the temperature and retention time, and the non-polarity of the…

The available solvents were ethyl acetate and hexanes. Two solvent composition were mixed and created to run the TLC analysis. The solvent of the ratio of 95% ethyl acetate and 5% hexanes and the solvent of the ratio of 95% hexanes and 5% ethyl acetate were created. The TLC analysis was tested to determine which one works the best. The first used composition was recorded. The corresponding…

implying non-polar characteristics of beta-carotene. Chlorophyll is seen to have a better affinity with the stationary phase due to its polar characteristics. This is further proven when a change in eluting solvent was used, with 1:1 hexane-ethyl acetate. Ethyl acetate contributes polarity to the solvent, allowing the polar substances such as chlorophyll to be eluted. The change in eluting solvent is necessary in order to successfully remove…

1.2.2. Physical Properties Methyl ethyl ketone is a clear, colourless fluid that is less viscous than water and has a somewhat acute odor that smells most of the ketones and is described by some as being similar to Boerscot. Compared with acetone it is less volatile and less soluble in water (about 27.5g / 100mL at room temperature). It is a solvent used for extracting gums and oils from plants and cleaning the remnants of metal and glass, so why often a cleaner or ingredient is found 1.2.3.…