The invention belongs to the technical field of pharmaceutical analysis and in particular relates to a method for detecting diethylaminoethanol in
procaine hydrochloride. The method comprises the following steps: (1), preparing a
test solution; to be specific, taking
procaine hydrochloride, dissolving the
procaine hydrochloride by using a
solvent, and diluting the solution into a solution of 10 mg / mL to 50 mg / mL; (2), preparing a reference solution; to be specific, taking a diethylaminoethanol reference substance, dissolving the diethylaminoethanol reference substance by using a
solvent, and carrying out
dissolution to obtain a solution of 0.05mg / mL to 0.5mg / mL; (3), taking the
test solution and the reference solution respectively, carrying out sample application on a same
silica gel thinlayer plate, carrying out expansion at a saturate tank, and carrying out
drying by
cold air; (4), carrying out development; to be specific, carrying out
fumigation and development in
iodine vapor; and(5), carrying out result determination; to be specific, a spot of a corresponding position of diethylaminoethanol is displayed in a sample and the spot is compared with a reference substance
spot color to avoid the deeper color. Therefore, the quality of
procaine hydrochloride can be controlled effectively. The operation becomes simple, convenient, and rapid; no special detection instrument is needed; and economical and practical effects are good.