A micromethod for measuring carbonic anhydrase activity using 18O exchange between CO2 and H2O
1988 ◽
Vol 65
(4)
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pp. 1902-1906
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Keyword(s):
We have developed a method of measuring the activity and characteristics of carbonic anhydrase (CA) using the disappearance of 18O from CO2 in 1 ml of gas contained in a glass chamber as it exchanges with H2O in 0.01 ml 0.25 M NaHCO3 solution in a thin (25 micron) porous membrane. Serial gas samples (approximately 0.02 ml) are analyzed in a mass spectrometer to obtain the rate of disappearance of the label. The enzyme activity can be measured inside intact cell or particle membranes. As little as 10(-15) mol of high-activity type CA can be detected at 25 degrees C, and the activity of 200 times this amount can be measured. The uncatalyzed hydration reaction velocity constant was 0.056 +/- 0.004 s-1, in agreement with published data.
1986 ◽
Vol 60
(2)
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pp. 638-645
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1981 ◽
Vol 29
(10)
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pp. 1213-1218
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1972 ◽
Vol 20
(8)
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pp. 621-626
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1984 ◽
Vol 32
(6)
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pp. 625-635
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1988 ◽
Vol 65
(4)
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pp. 1472-1480
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Keyword(s):
1988 ◽
Vol 65
(5)
◽
pp. 2236-2244
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2014 ◽
Vol 65
(4)
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pp. 377-385
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