Coward-Kelly Guillermo, Chang Vincent S, Agbogbo Frank K, Holtzapple Mark T
Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, United States.
Bioresour Technol. 2006 Jul;97(11):1337-43. doi: 10.1016/j.biortech.2005.05.021. Epub 2005 Aug 10.
Chicken feather keratin was treated with lime (calcium hydroxide) to obtain a liquid product rich in amino acids and polypeptides that can be used as an animal feed supplement. The effect of treatment conditions and the properties of the soluble keratin were studied. At high temperatures (150 degrees C), 80% of feather keratin was solubilized within 25 min, whereas a relatively longer reaction time (300 min) is needed at moderate temperatures (100 degrees C). After 3h of hydrolysis at 150 degrees C, 95% of feather keratin was digested. For the recommended conditions (100 degrees C, 300 min, and 0.1g Ca(OH)(2)/g dry feather), after lime treatment, about 54% of calcium can be recovered by carbonating. In rumen fluid, ammonia production from soluble keratin was similar to that of soybean and cottonseed meals and was greatly less than that of urea, indicating that no ammonia toxicity will result from cattle being fed soluble keratin.
鸡毛角蛋白用石灰（氢氧化钙）处理，以获得富含氨基酸和多肽的液体产品，该产品可用作动物饲料补充剂。研究了处理条件的影响以及可溶性角蛋白的性质。在高温（150℃）下，25分钟内80%的羽毛角蛋白可溶解，而在中等温度（100℃）下则需要相对较长的反应时间（300分钟）。在150℃水解3小时后，95%的羽毛角蛋白被消化。对于推荐条件（100℃、300分钟和0.1g Ca(OH)₂/g干羽毛），石灰处理后，约54%的钙可通过碳酸化回收。在瘤胃液中，可溶性角蛋白产生的氨与大豆粕和棉籽粕相似，且远低于尿素，这表明给牛喂食可溶性角蛋白不会导致氨中毒。
