What are the PKA and pi values of amino acids?
pKa and pI values of amino acids Amino acid 3-letter code 1-letter code pKa Cα-COOH pKa Cα-NH 3 + pKa side chain Isoelectric point (pI) Alanine Ala A 2.34 9.69 – 6.02 Arginine Arg R 2.17 9.04 12.48 10.76 Asparagine Asn N 2.02 8.80 – 5.41 Aspartic acid Asp D 2.09 9.82 3.86 2.98 Cysteine Cys C 1.71 10.78 8.33 5.02
What is the pKa of 4-aminophenol?
Measured pKa values are 5.48 (5) and 10.46 (6), for the amine and hydroxy functional groups, respectively (7). 4-Aminophenol is amphoteric and behaves either as a weak acid or weak base; the basic character usually predominates (8).
What are the values of the functional group pKa?
Approximate pKa chart of the functional groups: values to know 1. Protonated carbonyl pKa = ‐7 Other important pKa’s 2. Protonated alcohol or ether pKa = ‐2 to ‐3 H2 = 35 3. Carboxylic acid pKa = 4‐5 4. Ammonium ion pKa = 9‐10 5. Phenol pKa = 10 6.
Which is greater the pH or the pKa of alanine?
For example: Alanine at different pH’s (see pKa table) At pH 1.5: pH is less than the pKa of both the α-COOH and the α-NH 3 +, therefore, both protons are ON At pH 7: pH is greater than the pKa of the α-COOH ! H+ OFF pH is less than the pKa of the α-NH
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What is the pKa value of phenazine?
pKa Values INDEX Inorganic 2 Phenazine 24 Phosphates 3 Pyridine 25 Carboxylic acids 4, 8 Pyrazine 26 HCO3 10.33* HSe– 11.00* 77 H2CrO4 -0.98 30 H 2S 7.00* 77