Would you expect a change in column temperature to have an effect on a reversed-phase chromatographic separation of a steroid mixture? Explain the reason for your answer in (1) above
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- Would you expect a change in column temperature to have an effect on a reversed-phase chromatographic separation of a steroid mixture?
- Explain the reason for your answer in (1) above
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- Give a complete solution to the following.this drug contains one or more building blocks derived from either ethylene oxide or epichlorohydrin.Identify the part of each molecule that can be derived from one or the other of the building block and propose structural formulas for the nucleophile(s) that can be used along with either ethylene oxide or epichlorohydrin to synthesize each molecule.Enalapril is an anti-hypertension "prodrug" (i.e, a drug precursor) that is inactive until the ethyl ester (arrow in figure) is hydrolyzed by esterases present in blood plasma. The active drug is the dicarboxylic acid ("enalaprilat") that results from this hydrolysis reaction. (a) Enalapril is administered in pill form, but enalaprilat must be administered intravenously. Why do you suppose enalapril works as a pill, but enalaprilat does not? EtOOC -NH CH3 HOOC Enalapril (b) Enalaprilat is a competitive inhibitor of the angiotensin-converting enzyme (ACE), which cleaves the blood-pressure regulating peptide angiotensin. ACE has a KM = 12 µM for angiotensin, which is present in plasma at a concentration of 75 µM. When enalaprilat is present at 2.4 nM, the activity of ACE in plasma is 10% of its uninhib- ited activity. What is the value of K; for enalaprilat?
- Which would have the most serious effect on polypeptide product?Enalapril is an anti-hypertension “pro-drug” (i.e., a drug precursor) that isinactive until the ethyl ester (arrow in figure) is hydrolyzed by esterases present in blood plasma. The active drug is the dicarboxylic acid (“enalaprilat”) that results from this hydrolysis reaction.(a) Enalapril is administered in pill form, but enalaprilat must be administered intravenously. Why do you suppose enalapril works as a pill but enalaprilat does not? (b) Enalaprilat is a competitive inhibitor of the angiotensin-convertingenzyme (ACE), which cleaves the blood-pressure regulating peptideangiotensin I. ACE has a KM = 52 μM for angiotensin I, which is presentin plasma at a concentration of 75 μM. When enalaprilat is presentat 2.4 nM, the activity of ACE in plasma is 10% of its uninhibitedactivity. What is the value of K1 for enalaprilat?Progesterone is a female hormone that plays a critical role in the menstrual cycle by preparing the lining of the uterus for implantation of an egg. During W. S. Johnson's biomimetic synthesis of progesterone (a synthesis that draws inspiration from and mimics naturally occurring, biosynthetic pathways), one of the final reactions in the synthesis was believed to have proceeded via the following intermediate. Use resonance structures to explain why this intermediate is particularly stable. (J. Am. Chem. Soc. 1971, 93,4332-4334). SHAR
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