The CAT activity was measured by recording
H2O2 disappearance characterized by an absorbance
decrease at 240 nm according to a method described by
Aebi (1984), with modifications. A 5 g sample was mixed
with 25 mL of 50 mM phosphate buffer (pH 7.0) at
13,500 rpm using a homogenizer (Ultra-Turrax T25 basic,
IkaWerke GmbH & Co., Staufen im Breisgau, Germany) for 15 s. The mixture was centrifuged at 1,000 x g at 2C for
15 min. The supernatant of the mixture was removed and
filtered with Whatman filter paper No. 1 (GE Healthcare
Life Sciences, Amersham, Buckinghamshire, UK). Then,
100 μL of the filtered supernatant was mixed with 2.9 mL of
30 mM H2O2. The decrease in absorbance at 240 nm was
recorded every 30 s for 3 min. The catalase activity was calculated
as follows:
The CAT activity was measured by recordingH2O2 disappearance characterized by an absorbancedecrease at 240 nm according to a method described byAebi (1984), with modifications. A 5 g sample was mixedwith 25 mL of 50 mM phosphate buffer (pH 7.0) at13,500 rpm using a homogenizer (Ultra-Turrax T25 basic,IkaWerke GmbH & Co., Staufen im Breisgau, Germany) for 15 s. The mixture was centrifuged at 1,000 x g at 2C for15 min. The supernatant of the mixture was removed andfiltered with Whatman filter paper No. 1 (GE HealthcareLife Sciences, Amersham, Buckinghamshire, UK). Then,100 μL of the filtered supernatant was mixed with 2.9 mL of30 mM H2O2. The decrease in absorbance at 240 nm wasrecorded every 30 s for 3 min. The catalase activity was calculatedas follows:
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