Acetic anhydride

A new, specific, rapid gas chromatography-mass spectrometry (GC-MS) method was described to identify and quantify pregabalin in human plasma. Silylation and acylation reaction were tried for derivatization of pregabalin before GC-MS analysis. Derivatization was achived using N-(tert-butyldimethylsilyl)-N-methyltrifluoroacetamide (MTBSTFA). Identification and quantification of a new derivative were performed in selected ion monitoring mode using electron impact ionization. Pregabalin was…

Reagents 2,4-dichlorophenoxyacetic acid (2,4-D) (Sigma-Aldrich), 2,4 dichlorophenol (2,4-DCP) (Sigma-Aldrich), ferric sulfate (nH2O) (Carlo Erba), hydrogen peroxide (H2O2) (Carlo Erba), acetonitrile (Sigma-Aldrich) and Milli-Q water were used to perform all the experiments . All the reagents were used without further purification. Natural groundwater samples Samples were taken from groundwater wells localized in a small rural community (coordinates: 3º21’03.38” N, 76º26’24.51”) near to the…

Before beginning any of the tests the food samples were selected and separately blended in a small blender with water. This step was necessary for the food samples to fit into test tubes. Each food sample was left in a separate beaker to await the experiments. The first step of test 1a was to prepare 6 test tubes. They were labeled by what their future contents would be. The control for this experiment was a glucose standard solution; it would test positive for reducing sugars. 1.5mL of the…

The purpose of this investigation was to find a high regression rate fuel suitable for use as a mixture with hydroxyl-terminated polybutadi- ene (HTPB). Guanidinium azo-tetrazolate (GAT) is the compound that was the focus of our re- search. GAT is a salt containing a high per- centage of nitrogen. It has two conjugated ni- trogen rings, which are negatively charged, and a positively charged component consisting of nitrogen, carbon, and hydrogen. In addition to the high-energy content of this…

Hiking Hydration Packs Keeping yourself hydrated is a must while hiking, but toting around disposable water bottles in your backpack and trying to drink from them while walking can be a real juggling act. That’s why more and more hikers are strapping on hydration packs before trekking the backcountry. A top-quality hydration pack make carrying up to 3 liters of water on your surprisingly easy, and you can take sips from the shoulder-high tubing system as often as like without breaking your…

Isolation of Caffeine from Teabags Purpose: The purpose of the lab is to separate caffeine from the teabags by using three techniques, extraction, recrystallization, and melting point determination. Procedure: 1. In the first step we have to brew a very strong cup of tea. Bring in two tea bags from home. Bring about 100 ml of water to boil in a 150 ml beaker. Add about tip of spatula full of sodium carbonate. Place the tea bags in the boiling water and let them steep for 7 - 10 minutes…

The researchers compared both biologically produced manganese oxides and chemically produced manganese oxides for the oxidation of diclofenac. Because biologically produced manganese oxides are known to have high specific surface areas and high catalytic reactivity, this substance offers higher rates of oxidation for diclofenac when compared to chemically produced manganese oxides.² If biologically produced manganese oxides prove to completely eliminate diclofenac from the water supply, the…

In this lab, benzoic acid, benzocaine, and 9-fulorenone are isolated from a three-component mixture by using the acid-base extraction and other following types of various extraction techniques. An acid-base reaction is utilized in order to isolate the individual species from the mixture. First, in isolating the base benzocaine, proton transfers occurred via reaction with hydrochloric acid, which led to a significant shift in the polarity of the said compound, although the conjugate acid of…

Truc-Nhi Do Separation of a Mixture The purpose of this lab was to separate a mixture, calculate the percent composition by mass, and find percent error. I first started out by taking the mass of each component of the lab. I used the infiltration method to allow the salt and water solution, a blended mixture, to pass through the filtration paper and into the beaker. A trick to know if something is a solution is to see is it has the aqueous sign (aq) in the formula, like NaCl(aq). This step…

16, 2014 repairing a damaged painting on canvas can be a trying experience. There are several repairs that you can do by yourself without having to consult an expert. You can bows in places on the canvas, repair small tears or holes and replacing broken stretcher strips without a lot of problems. 1 .Repair any bows in the canvas. A canvas can get bows in the fabric when it has been stored. If anything leans up against the canvas, it can push an impression into the fabric. This is the easiest…