氧化镁和碱性蛋白酶两步法处理废铬革屑  

Two step processing for chrome shavings with MgO and alkaline protease

作　　者：陈武勇[1] 秦涛[1] 辜海兵[1] 石碧[1] 

机构地区：[1]四川大学皮革化学与工程教育部重点实验室,成都610065

出　　处：《中国皮革》2001年第15期1-5,共5页China Leather

基　　金：教育部骨干教师基金资助研究项目

摘　　要：采用两步法处理铬鞣革屑。首先用氧化镁处理提取明胶 ,然后再在碱性条件下通过蛋白酶水解作用提取水解蛋白质。研究了各种因素 ,如反应液 p H值、温度及反应时间等对明胶和水解蛋白质质量及其回收率的影响 ,并分别测定了明胶和水解蛋白质的水分含量、灰分含量、铬含量、总固体含量及回收率 ,明胶的黏度和密度。研究结果表明 :Cr2 O3 在明胶和水解蛋白质中含量在 1- 10× 10 -6之间 ;明胶黏度可达16.2 813 CP,颜色为淡黄色 ,符合国家明胶 QB581- 1981标准中的一级标准 ;水解蛋白质可作饲料 ;蛋白质总回收率为 80 %左右。Digested with an alkali in the first step and with an alkaline protease in the second step, commercial chrome shavings was isolated two different protein products:gelatin and protein hydrolysate. Chemical and physical properties, such as yield, total solids, ash, chrome content and moisture, viscosity and density of these isolated samples were determinated. Some parameters that affect protein products′ properties, such as pH, hydrolytic temperature, hydrolytic time and so on, were studied.As a result, the content of Cr 2O 3 in the gelatin and the protein hydrolysate is between 1×10 -6 and 10×10 -6 ;the viscosity of the gelatin is 16.2813CP; the color of the gelatin is pale yellow; the indexes of the gelation are in keeping with the first-grade gelatin specifications in the state standard QB 581-1981; the protein hydrolysate can be used as feed; the total recovery rate of protein is about 80%.

关 键 词：皮革 铬鞣革屑 明胶 水解蛋白质 蛋白酶 氧化镁 副产品 

分 类 号：TS59[轻工技术与工程—皮革化学与工程]