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2 Write an equation for the hydrolysis in acidic solution of the dipeptide ester aspartylpheny lalanin...
Would you expect the dipeptide valylalanine to give a positive reaction with nitric acid solution? Why...
Would you
expect the dipeptide valylalanine to give a positive reaction with
nitric acid solution? Why or why not?
3, Would you expect the dipeptide valylalani Why or why not? alanine to give a positive reaction with nitric acid solution? 4. In the chromatogram below, calculate an Re for each component of the mixture. Which componert is probably the more polar compound? Solvent front Origin From a book or Internet source, find the pl of the amino acid lysine. What...
5. Which of the 20 standard amino acids are a. Cyclic b. Aromatic C. Sometimes charged...
5. Which of the 20 standard amino acids are a. Cyclic b. Aromatic C. Sometimes charged at physiological pH d. Technically not hydrophobic, polar, or charged e. Basic f. Acidic . Sulfur containing 6. Estimate the net charge of a His-His-His-His tetrapeptide at pH 6.0 7. The artificial non-nutritive sweetener aspartame is a dipeptide with the sequence Asp-Phe. The carboxyl terminus is methylated. Draw the structure of aspartame at pH 7.0. Sketch a titration curve for the amino acid cysteine,...
biochem question . Aspartame is an artificial sweetener that is a dipeptide composed of Asp-Phe in...
biochem question
. Aspartame is an artificial sweetener that is a dipeptide composed of Asp-Phe in which the carboxyl terminus is modified by attachment of a methyl group. Draw the structure of aspartame at pH7. (4 marks) b. Calculate the isoelectric point (PI) for Aspartame. (2 marks) C. At a pH of 10 what form of ion exchange chromatography would be most appropriate to isolate Aspartame? Explain (2 marks) 2) Complete the Venn diagram with respect to the given Kd...
Carboxylic Acids and Esters EXPERIMENT 22 OBSERVATIONS AND RESULTS Synthesis and Identification of an Ester: Esterification...
Carboxylic Acids and Esters EXPERIMENT 22 OBSERVATIONS AND RESULTS Synthesis and Identification of an Ester: Esterification 1. Give the name and structure of the ester which you synthesized. What fruit did you associate with the odor of the ester? to noldsoinogs w to esar bnn eaman sd vio stolpi Look up the ester and its fruit sburce in your textbook. (If it is not in your textbook, ask your instructor.) Did you associate the ester with the right fruit? If...
1. Write an equation for the base hydrolysis of methyl benzoate by KOH. 2. How many...
1. Write an equation for the base hydrolysis of methyl benzoate by KOH. 2. How many ester groups are in a triglyceride? Give the structure of a triglyceride (triacylglycerol) from you textbook or the lab sheet and put a box around each ester group. 3. If the triglyceride in question 2 underwent base hydrolysis, what 4 products would you obtain? Give the condensed formulas. 4. Which of these products are soaps? (you may circle the ones that are soaps.)
Post-Lab Questions 1. Why must you use a pencil, and not ink or felt-tip pen, to...
Post-Lab Questions 1. Why must you use a pencil, and not ink or felt-tip pen, to mark on the paper the origin of the spots of the amino acid preparations? 2. In this experiment, suppose you forgot to mark the position of the solvent front when you tested the hydrolysate of aspartame against the other amino acids. a. Is it still possible to determine how many amino acids were present in the hydrolysate? Explain your answer. b. Could you still...
1. Write equations for the reaction of 2-methyl propane-1- magnesium bromide with acetaldehyde include the hydrolysis...
1. Write equations for the reaction of 2-methyl propane-1- magnesium bromide with acetaldehyde include the hydrolysis of the reaction mixture with dilute acid. B) Why should anhydrous diethyl ether be used rather than regular solvent grade diethyl ether to prepare the solution of benzaldehyde that is added to the Grignard reagent, 2- methyl propane-1- magnesium bromide? C) By drawing the structure indicate the polarity (charge separation) of the bond between carbon and bromine in 1-bromo-2-methyl propane. Is 1-bromo-2-methyl propane electrophile...
I need help with an organic chemistry lab. The main topic is Ester Hydrolysis. I start...
I need help with an organic chemistry lab. The main topic is Ester Hydrolysis. I start with 1,7-Dimethylhaptanedioate and water (solvent), and add the catalyst H2SO4. The reaction mixture is extracted with water. The final product is heptanedioic acid. I need to know the steps of the reaction mechanism, as well as the role of each component in the reaction. I also need to know why the reaction mixture is extracted with water, and what the water does. Why water...
+ 2. Drow the structure the amino acid serine of H₂N-CH-C-o CH-OH a) in acidic solution...
+ 2. Drow the structure the amino acid serine of H₂N-CH-C-o CH-OH a) in acidic solution at a pH below isoelectric point. is) in basic solution at a pH above isoelectric point
Experiment #6 Ester Synthesis PRE-LAB ASSIGNMENT This pre-lab assignment is worth 5 points for this Experiment...
Experiment #6 Ester Synthesis PRE-LAB ASSIGNMENT This pre-lab assignment is worth 5 points for this Experiment and should be completed on a separate page and turned in at the beginning of lab. 1. Read the experiment carefully 2. Safety Considerations: Summarize O safety and health hazards for working with glacial acetic acid, butanoic acid and petroleum ether. 3. Procedure: Summarize the procedure using a bullet list. Assume you are summarizing the procedure to a fully qualified chemist, i.e. don't include...
Would you
expect the dipeptide valylalanine to give a positive reaction with
nitric acid solution? Why or why not?
3, Would you expect the dipeptide valylalani Why or why not? alanine to give a positive reaction with nitric acid solution? 4. In the chromatogram below, calculate an Re for each component of the mixture. Which componert is probably the more polar compound? Solvent front Origin From a book or Internet source, find the pl of the amino acid lysine. What...
5. Which of the 20 standard amino acids are a. Cyclic b. Aromatic C. Sometimes charged at physiological pH d. Technically not hydrophobic, polar, or charged e. Basic f. Acidic . Sulfur containing 6. Estimate the net charge of a His-His-His-His tetrapeptide at pH 6.0 7. The artificial non-nutritive sweetener aspartame is a dipeptide with the sequence Asp-Phe. The carboxyl terminus is methylated. Draw the structure of aspartame at pH 7.0. Sketch a titration curve for the amino acid cysteine,...
biochem question
. Aspartame is an artificial sweetener that is a dipeptide composed of Asp-Phe in which the carboxyl terminus is modified by attachment of a methyl group. Draw the structure of aspartame at pH7. (4 marks) b. Calculate the isoelectric point (PI) for Aspartame. (2 marks) C. At a pH of 10 what form of ion exchange chromatography would be most appropriate to isolate Aspartame? Explain (2 marks) 2) Complete the Venn diagram with respect to the given Kd...
Carboxylic Acids and Esters EXPERIMENT 22 OBSERVATIONS AND RESULTS Synthesis and Identification of an Ester: Esterification 1. Give the name and structure of the ester which you synthesized. What fruit did you associate with the odor of the ester? to noldsoinogs w to esar bnn eaman sd vio stolpi Look up the ester and its fruit sburce in your textbook. (If it is not in your textbook, ask your instructor.) Did you associate the ester with the right fruit? If...
Post-Lab Questions 1. Why must you use a pencil, and not ink or felt-tip pen, to mark on the paper the origin of the spots of the amino acid preparations? 2. In this experiment, suppose you forgot to mark the position of the solvent front when you tested the hydrolysate of aspartame against the other amino acids. a. Is it still possible to determine how many amino acids were present in the hydrolysate? Explain your answer. b. Could you still...
1. Write equations for the reaction of 2-methyl propane-1- magnesium bromide with acetaldehyde include the hydrolysis of the reaction mixture with dilute acid. B) Why should anhydrous diethyl ether be used rather than regular solvent grade diethyl ether to prepare the solution of benzaldehyde that is added to the Grignard reagent, 2- methyl propane-1- magnesium bromide? C) By drawing the structure indicate the polarity (charge separation) of the bond between carbon and bromine in 1-bromo-2-methyl propane. Is 1-bromo-2-methyl propane electrophile...
+ 2. Drow the structure the amino acid serine of H₂N-CH-C-o CH-OH a) in acidic solution at a pH below isoelectric point. is) in basic solution at a pH above isoelectric point
Experiment #6 Ester Synthesis PRE-LAB ASSIGNMENT This pre-lab assignment is worth 5 points for this Experiment and should be completed on a separate page and turned in at the beginning of lab. 1. Read the experiment carefully 2. Safety Considerations: Summarize O safety and health hazards for working with glacial acetic acid, butanoic acid and petroleum ether. 3. Procedure: Summarize the procedure using a bullet list. Assume you are summarizing the procedure to a fully qualified chemist, i.e. don't include...
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