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- The ideal buffer range for any amino acids is pH above or below its pI values because the amino acid will get get precipitated at its pI. pKa1 of -COOH group of Cys = 1.71 pKa2 of -NH2 group of Cys = 10.78 pKa3 of side chain group of Cys = 8.33 (it indicates that the thiol group of Cys is a strong acid than the -NH2 group pf Cys as pKa Cys side chain is lower). Thiol side chain of Cys will loose proton first than -NH2. Net charge on Cys is zero in structure B, i.e. Structure B is a zwitterion and pI can be calculated from pKa1 and pKa3. Structure B of Cys, pI = (8.33 + 1.71) / 2 = 10.04/2 = 5.02 pH above its pI the Cys will be -vely charged (deprotonated) while pH below its pI it will be +vely charged (protonated). So, selection of buffer depends on its pI values, not pKa values of each functional group, QUESTION: What are the buffer regions/effective pH range?5. Draw an approximate titration curve of glycine. Label the approximate isoelectric point of the glycine on the curve and be sure to label the axis of the graph. Pk1 is 2.35 and pk2 is 9.78 for glycine. 6. Draw the major amino acid form (s) you expect to find at pH2.35. In the titration curve above. Please answer both 5 and 6Shown below is the structure of a polypeptide with the pK, values of its acidic hydrogens. pK = = 10.1 H OH pK, = 9.2 H. pKa = 2.1 H. N-H pK, = 6.0 pKa = 3.9 1. How many peptide bonds are present in one molecule of the polypeptide? [ Select ] II. Over what pH range would this molecule predominantly exist in a state that has a net charge of zero? [ Select ] ZI
- A protein has an isoelectric point at 6. It is soluble at what pH?Given amino acids A and B 5. Draw the structure of amino acid A at pH < pI 6. Draw the structure of amino acid B at its isoelectric point (pI)29. Amino Acid Chemistry: Using the amino acid chart provided..Ala-Lys-Cys & give the isoelectric point for the tripeptide. Table 23.2 The pK, Values of Amino Acids pk, a-COOH a-NH3* Amino acid side chain Alanine 2.34 9.69 2.17 9.04 12.48 Arginine Asparagine 2.02 8.84 3.86 Aspartic acid Cysteine 2.09 9.82 1.92 10.46 8.35 Glutamic acid 2.19 9.67 4.25 Glutamine 2.17 9.13 Glycine 2.34 9.60 1.82 9.17 6.04 Histidine 2.36 9.68 Isoleucine Leucine 2.36 9.60 2.18 $ 95 10.79 Lysine 2.28 9.21 Methionine 16 9.18 Phenylalanine 1.99 10.60 Proline 2.21 9.15 Serine 2.63 9.10 Threonine 2.38 9.39 Tryptophan Tyrosine 9.11 10.07 2.20 2.32 9.62 Valine O something else! 5.14 O 8.65 something else! 5.81 9.02 9.57
- The structure of a vitamin is shown below. H HH H. нн C C-H H H но нн H Identify two potentially nucleophilic atoms and two potentially electrophilic atoms in your structure, giving a very brief explanation in each case. 2.first amino acid is R second amino acid is L Draw your dipeptide at pH 7.4 What is the Log Kow of the pesticide What is the molar concentration in the octanol phase What is the number for the pesticide How many chiral centers does your assigned pesticide contain?1. The three pKa values for the amino acid astrophan are: 1.9, 7.5, and 9.3. Calculate the isoelectric point of this amino acid if protonation of the group with a pKa = 7.5 results in a positively-charged group.
- Indicate the COOH-pKa value of the HAY tripeptide on the titration curve. Titration curve of tripeptide HAY 14 13 12 11 10 3 2. 1 10 15 20 25 30 35 40 45 Volume 0.1M NAOH titrated Hd6. Draw each of the following amino acids in the ionic form that predominates at pH 7. Show all charges. (Refer to table 16.3 on page 475 in the textbook.) 6.3. 6.4. 6.517. If an intravenous injection contains 20% (w/v) of mannitol, how many milliliters of the injection should be administered to provide a patient with 100 g of mannitol? 17. 500 mL