Bring crude enzyme in a test tube immersed in a water bath at 50 ° C for about 10 minutes, then mix a solution of crude enzyme 0.5 ml of the substrate, a sheet of filter paper soaked in a solution of phosphate buffer of 0.5 ml and incubated. at 50 ° c for 60 minutes, add the solution. dinitrosalicylic acid volume of 3.0 ml of boiling water, boil 10 minutes, then cooled immediately. Then add water 20 ml solution such absorbance measurements with a spectrophotometer. At a wavelength of 550 nm
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