9. You add 1.5 mL of 200 µM NADPH to 1.5 mL of a solution with an unknown concentration of oxidized glutathione, GSSG, and a catalytic amount of glutathione reductase. The final absorbance of the solution was 0.25 at 340 nm in a 1 cm cuvette. What was the concentration of GSSG in the original 1.5 mL? The reaction catalyzed by glutathione reductase is: GSSG + NADPH + H+ → 2 GSH + NADP+ The relevant extinction coefficients are: NADPH, €340 = 6220 M-¹ cm-¹ NADP+, €340 = 0

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9. You add 1.5 mL of 200 μM NADPH to 1.5 mL of a solution with an
unknown concentration of oxidized glutathione, GSSG, and a
catalytic amount of glutathione reductase. The final absorbance
of the solution was 0.25 at 340 nm in a 1 cm cuvette. What was the
concentration of GSSG in the original 1.5 mL?
The reaction catalyzed by glutathione reductase is:
GSSG + NADPH + H+ → 2 GSH + NADP+
The relevant extinction coefficients are:
NADPH, €340 = 6220 M-¹ cm-¹
NADP+, €340 = 0
A. 40 μM
B. 80 μM
C. 120 μM
D. 160 μM
E. 200 μM
Transcribed Image Text:9. You add 1.5 mL of 200 μM NADPH to 1.5 mL of a solution with an unknown concentration of oxidized glutathione, GSSG, and a catalytic amount of glutathione reductase. The final absorbance of the solution was 0.25 at 340 nm in a 1 cm cuvette. What was the concentration of GSSG in the original 1.5 mL? The reaction catalyzed by glutathione reductase is: GSSG + NADPH + H+ → 2 GSH + NADP+ The relevant extinction coefficients are: NADPH, €340 = 6220 M-¹ cm-¹ NADP+, €340 = 0 A. 40 μM B. 80 μM C. 120 μM D. 160 μM E. 200 μM
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