AIM To establish a sensitive method of electrophoresis for low molecular weight peptides. METHODS Tricine SDS polyarcrylamide gel electrophoresis with 6 mol·L -1 urea was used. The samples were treated with different methods(temperature and time interval) and varying loading quantity of samples. The linear regression analysis was made. RESULTS Different treatment of samples had no effect on the experimental results. The optimum loading scope of samples was 5~10 μg per lane. The correlation coeffi...