Abstract: Adopting half alternative culture MRS, four bacteria strains were screened from four kinds of fermented vegetables,namely cabbage, celery, sour pepper, and lettuce. Identified as the lactic acid bacteria, the degrading result of external cholesterolby these bacteria in MRS-CHOL culture was studied. Under 38℃, after training 5d, the degradation rate of the cholesterol wasdetermined. From different inoculating amounts of the four bacterial strains, the degrading rate of cholesterol in differentcholesterol contents in the culture medium was assayed to obtain the different variation tendency curve. Mean while the changeof pH and amount of bacterium in the culture medium were studied.

Key words: lactic acid bacteria, cholesterol, degradation, screening bacteria