Coward-Kelly Guillermo, Agbogbo Frank K, Holtzapple Mark T
Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA.
Bioresour Technol. 2006 Jul;97(11):1344-52. doi: 10.1016/j.biortech.2005.05.017. Epub 2005 Aug 10.
Air-dried cow hair was treated using Ca(OH)(2) (insoluble in water but dissolved during reaction) at 100 degrees C. To obtain a liquid product rich in amino acids, a well-insulated, stirred reactor was used to perform the hydrolysis process for different time periods. High lime loadings and a long treatment period convert 70% of cow hair to soluble amino acids and polypeptides. Protein solubilization varies with lime loading especially for the long-term treatment (t>12h) showing that the hydroxyl group is required as a catalyst for the hydrolysis reaction and that lime is consumed during the process; as a consequence lower lime loading generate lower conversions. A very perceptible ammonia odor in the soluble product suggests amino acid degradation. Arginine, threonine, and serine are the more susceptible amino acids under alkaline hydrolysis. The amino acid composition of the solubilized product compares poorly with the essential amino acid requirements for various monogastric domestic animals, but it has value as ruminant feed.
将风干的牛毛在100℃下用Ca(OH)₂（不溶于水但在反应过程中溶解）进行处理。为了获得富含氨基酸的液体产物，使用一个隔热良好的搅拌反应器在不同时间段进行水解过程。高石灰用量和较长的处理时间可将70%的牛毛转化为可溶性氨基酸和多肽。蛋白质的溶解率随石灰用量而变化，特别是对于长期处理（t>12小时），这表明羟基是水解反应的催化剂，并且在过程中石灰会被消耗；因此，较低的石灰用量会产生较低的转化率。可溶性产物中非常明显的氨气味表明氨基酸发生了降解。精氨酸、苏氨酸和丝氨酸是碱性水解下更易受影响的氨基酸。溶解产物的氨基酸组成与各种单胃家畜的必需氨基酸需求相比不太理想，但它作为反刍动物饲料具有价值。
