10- Transfer the ester layer to a small dry test tube and dry the ester with anhydrous CaCl2 and stir for 10 min. 11- put it in a preweighed dry round bottom flask . 14- Determine the yield, refractive index, and % yield of ester. Conditions :- 1) This reaction is catalyzed by acid, Like Fischer esterification. 2) Usage of water in step (5):So that after Estrification is completed , any excess unreacted acetic anhydride is hydrolyzed.
The incubation mixture contained 2.5 ml of 1.2% (w/v) fibrin, 2.5 ml of 100 mM Tris–HCl buffer, 10 mM CaCl2 (pH 7.8), and 20 µg of enzyme. The incubation was carried out at 37°C for 30 min, and the reaction was stopped by adding 5 ml of 110 mM trichloroacetic acid containing 220 mM sodium acetate and 330 mM acetic acid. This reaction mixture was centrifuged at 3,000×g for 5 min, and the absorbance of the trichloroacetic acid (50 mM) soluble product was determined at 275 nm. One unit of fibrinolytic enzyme activity was defined as the amount of enzyme required to liberate 1 µg of L-tyrosine per minute at 37°C. The total protein determination was performed as described by Lowry et al.
We added sodium carbonate until the pH of the mixture was 8. After neutralize, we collected benzocaine by vacuum filtration. We used a Buchner funnel to collect benzocaine. We used three 10 ml of water to wash the product. After the product was dry, we weighed, calculate the percent yield and determined the melting point of the product.
Figure4 - the chemical structure of sucrose. Figure5 - the chemical structure of lactose. Cellular respiration is when food molecules like glucose are oxidised to form carbon dioxide and water. Adenosine triphosphate is created by a catabolic pathway to be used by the cell. Cellular respiration happens in both eukaryotic and prokaryotic cells.
• Carefully decant the solvent solution from the drying agent through the funnel into the flask. Rinse the Erlenmeyer flask with about 10 ml of solvent and pour the solvent through the funnel, too. Remove the funnel, add two or three boiling chips and reattach the thermometer and adapter to the still pot. • Discard the magnesium sulfate remaining in the Erlenmeyer flask by dissolving it in tap water and pouring the solution down the drain. • Before beginning the distillation, weigh a clean, dry 1 narrow mouth screw cap bottle on a balance.
0,1 gr of kaffir lime oil nanocapsule is weighed and diluted to 100 ml using aquadest, taken as much as 1 ml (100x dilution) to put in the reaction tube then 1ml of saturated NaCO3 solution is added to the test tube and incubated for 10 min at room temperature. Then 0.5 ml of the folinciocalteu (Chemix CV, Yogyakarta) reagent and 7.5 ml aquadest were added, the mixture homogenized using vortex and then incubated for 30 min at room temperature under dark environmental conditions. Absorbance of the sample was then measured using a UV-vis spectrophotometer at a wavelength of 770 nm. The total phenol content of the sample was interpreted to be equivalent to gallic acid based on the standard curve of obtained gallic
25 mL of a 1 M phenyl magnesium bromide in tetrahydrofuran was dispensed into the beaker by using a syringe. The resulting mixture was stirred for about 15 minutes when the purple color turned into a brown color permanently. It was then extracted first with 20 mL of dichloromethane and the bottom DCM layer containing the product was reextracted with 10 mL of dichloromethane. The final bottom layer was retained and dried with MgSO4. The drying agent was discarded when the mixture was filtered.
Your Agar plate should now be sterilized, the process of sterilization should be finished. Procedure of the experiment: Prepare all the test tubes and place them in their respective test-tube holders. Put 10 millimeter of the 0.9 % saline solution in one test tube. Put 10 millimeter of the chicken broth in the other test tube. Put 1 capsule of the bioflorin into each of the test tubes and tap them until the capsule dissolves.
Throughout the urea cycle, the amino acid, arginine, is changes into ornithine- this is another amino acid when hydrated, that is when water was added. During this reaction, urea is the product formed (Nelson and Cox 2008). Figure 1 shows the urea cycle, occurs specifically in the mitochondria and cytosol in the liver. (Nelson and M.Cox 2008). Urea is made in the liver by means of enzymes in the urea cycle.