In order to make full use of bullfrog skin resources, in this experiment through determination of hydrgxyproline content determines the bullfrog skin collagen in a total of 42.58%, drawing the standard curve obtained collagen hydroxyproline, which content is 28.32%, the bullfrog skin aiker pretreatment with acetic acid and pepsin extraction, combination, and the use of response surface method to the extraction conditions for process optimization, the results show that： the optimum extraction conditions for l0 DEG C, at the concentration of 2.5 per 1000pepsin, in 1：40ratio of material to liquid, extraction of 24h. The optimum conditions of collagen extraction, and by the salting out, freezing and drying to obtain powdered collagen products. Its measured rate is 27.98%. The extracted bullfrog skin collagen by ultraviolet analysis and detection of amino acids, the results show that the extraction of high purity collagen products.%为了充分利用牛蛙皮资源，本试验通过测定羟脯氨酸含量确定了牛蛙皮中胶原蛋白总量为42．58％，绘制羟脯氨酸标准曲线，得出其中胶原蛋白含量为28．32％，牛蛙皮经过预处理后，采用乙酸和胃蛋白酶结合提取，并利用响应面法对提取条件进行工艺优化，结果表明：最佳提取条件为10℃下，以浓度为2．5‰的胃蛋白酶，在1：40料液比中，提取24h。以最佳条件提取胶原蛋白，并经盐析、冷冻干燥得到粉末状胶原蛋白产品。测得其得率为27．98％。对所提取的牛蛙皮胶原蛋白进行紫外分析和氨基酸检测，结果表明所提取的胶原蛋白产品纯度较高。
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