Microplate assay
PRP, human type O, was obtained from Doctors’ Blood Centre, Manila. Residual red blood cells were removed by centrifugation at 1800 rpm for 5 minutes. Platelets were washed with Tyrode’s buffer (pH7.4) and then centrifuged at 1800 rpm for 10 minutes (Kuo et al., 1990). Platelets were resuspended 1:1 (vol/vol) in EDTA-free Tyrode’s buffer containing 0.25% bovine serum albumin (Sigma). The platelet suspension (192 μl) was transferred to wells in a 96 well microtiter plate and incubated at 37oC for 5 minutes. Crude methanol extracts of sponges and tunicates dissolved in NSS (8 μl of 50 mg/ml stock; final concentration in the microplate, 2 mg/ml) were added in duplicate and incubated at 37oC for 30 minutes. Aspirin (Sigma, 2 mg/ml) was used as positive control. NSS was used as negative control. Platelets were induced to aggregate by addition of 0.25 M CaCl2 (4 μl) (Born and Cross, 1963). The plate was incubated at 37oC for 30 minutes. Giemsa dye (4 μl) was added to each well and incubated for 5 minutes. The microtiter plate was then inverted, tapped gently, and washed with distilled water. Each well was observed for the presence or absence of violet gels.
Microplate assayPRP, human type O, was obtained from Doctors’ Blood Centre, Manila. Residual red blood cells were removed by centrifugation at 1800 rpm for 5 minutes. Platelets were washed with Tyrode’s buffer (pH7.4) and then centrifuged at 1800 rpm for 10 minutes (Kuo et al., 1990). Platelets were resuspended 1:1 (vol/vol) in EDTA-free Tyrode’s buffer containing 0.25% bovine serum albumin (Sigma). The platelet suspension (192 μl) was transferred to wells in a 96 well microtiter plate and incubated at 37oC for 5 minutes. Crude methanol extracts of sponges and tunicates dissolved in NSS (8 μl of 50 mg/ml stock; final concentration in the microplate, 2 mg/ml) were added in duplicate and incubated at 37oC for 30 minutes. Aspirin (Sigma, 2 mg/ml) was used as positive control. NSS was used as negative control. Platelets were induced to aggregate by addition of 0.25 M CaCl2 (4 μl) (Born and Cross, 1963). The plate was incubated at 37oC for 30 minutes. Giemsa dye (4 μl) was added to each well and incubated for 5 minutes. The microtiter plate was then inverted, tapped gently, and washed with distilled water. Each well was observed for the presence or absence of violet gels.
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