Three detecting methods in yeast proteinase A (PrA) assay including UV absorbance, Lowry method and modified Bradford method were compared when using casein or hemoglobin .

• 酵母蛋白酶A是啤酒酵母中的一种蛋白水解酶,啤酒中残留的酵母蛋白酶A对啤酒泡沫有负面作用。