A sample containing histidine (pKas 1.8, 6.0, 9.3), lysine (pKas 2.2, 9.1, 10.5), and leucine (pKas 2.3, 9.7) at pH 7 is loaded onto an SP-Sepharose resin and then eluted at pH 7 using a gradient of increasing NaCl concentration. What would be the order of elution of the amino acids from the column (first to last)?

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter28: Atomic Spectroscopy
Section: Chapter Questions
Problem 28.13QAP
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Chemistry
Question 2
A sample containing histidine (pKas 1.8, 6.0, 9.3), lysine (pKas 2.2, 9.1, 10.5), and
leucine (pKas 2.3, 9.7) at pH 7 is loaded onto an SP-Sepharose resin and then eluted
at pH 7 using a gradient of increasing NaCl concentration. What would be the order
of elution of the amino acids from the column (first to last)?
A) His, Lys, Leu
B) His, Leu, Lys
OC) Leu, His, Lys
D) Lys, Leu, His
E) Leu, Lys, His
When the solution pH is lower than the pl of a protein, the protein will be negatively
charged.
A) True
B) False
Transcribed Image Text:Chemistry Question 2 A sample containing histidine (pKas 1.8, 6.0, 9.3), lysine (pKas 2.2, 9.1, 10.5), and leucine (pKas 2.3, 9.7) at pH 7 is loaded onto an SP-Sepharose resin and then eluted at pH 7 using a gradient of increasing NaCl concentration. What would be the order of elution of the amino acids from the column (first to last)? A) His, Lys, Leu B) His, Leu, Lys OC) Leu, His, Lys D) Lys, Leu, His E) Leu, Lys, His When the solution pH is lower than the pl of a protein, the protein will be negatively charged. A) True B) False
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