The invention discloses a method for detecting
pesticide residues in
sulfur-containing vegetables by an
enzyme inhibition method. The method comprises the following steps of 1, preparing a
standard solution, 2, preparing a sample, 3, testing control groups through the processes of adding a
buffer solution into a
beaker, adding dropwisely acetate or
sodium hydroxide into the
beaker, adjusting a pH value of the
mixed solution to a pH value of 9, adding an
enzyme solution and a color-developing agent into the
mixed solution with a pH value of 9, shaking up, standing at a temperature of 37 DEG C for 15 minutes, adding a substrate solution into the
mixed solution treated by the previous step, shaking up, and detecting an
absorbance variation value delta A0 of the mixed solution undergoing a reaction at
wavelength of 410 nanometers for 3 minutes by a
spectrometer, 4, adding
sulfur-containing vegetable sample extract into a
beaker, carrying out processes same as the processes of the step 3, and detecting an
absorbance variation value delta A1 of a vegetable sample mixed solution undergoing a reaction at
wavelength of 410 nanometers for 3 minutes by a
spectrometer, and 5, calculating an
enzyme inhibition percentage according to a formula of an
enzyme inhibition percentage=[(
delta A0-delta A1) / delta A0]*100, wherein when the calculated
enzyme inhibition percentage is great than or equal to 50%, it is shown that there are
pesticide residues in the detected
sulfur-containing vegetable. The method eliminates the interference of sulfides in a sulfur-containing vegetable on
pesticide residue detection through adjustment of a pH value of a vegetable sample solution, can rapidly, simply and accurately detect a
pesticide residue ratio of a sulfur-containing vegetable, has a low cost, and is suitable for on-site detection.