【产品名称】：L-胱氨酸
【别    称】：(R,R)-3,3'-二硫代双(2-氨基丙酸) 双硫代氨基丙酸
【英 文 名】：L-Cystine
【规    格】：99%
【外    观】: 白色六角形板状晶体或结晶粉末
【气    味】：无臭，无味
【产品性状】：六角形板状晶体或结晶粉末
【溶 解 性】：溶于稀酸和碱性溶液，极微溶于水，不溶于乙醇、乙醚、苯和氯仿。
【分 子 式】：C6H12N2O4S2
【分 子 量】：240.3

合成方法主要有三种： 1、利用空气氧化L-半胱氨酸的碱 性水溶液。 2、从毛发中提取,特别是马毛中含量可达8%。利用毛发在110℃下在酸中水解,或角质蛋 白的水解,除去杂质后,用碱中和至pH=4.8,进行结晶,可得粗制品,再加热溶于盐酸,加 入活性炭脱色,过滤,滤液用氨中和,重结晶,洗涤,直至不含氯离子及铁离子为止。 3、生产酪氨酸的副产物 工业上主要从毛发中提取，收率可达7.5-8% 4、β-氨基丙腈法　由β-氨基丙腈经水解、酸析而得. 5、 烟草：BU，21；FC，20。实验中利用丝纤维（脱胶白丝）的酸水解制备。 6、从水中得正交形晶体

Company Profile：

HQCHEALTH ^®& HQCBEAUTY ^®， Affiliated to the multinational chemical group HQC Group. We specialize in the research and development, production, and import and export of natural plant extracts, high-purity monomers of plant functional ingredients, standardized extracts, and health products, cosmetics, raw materials, and medicinal products. We have three specialized production factories and one research institute, and set up sales points in Hangzhou, Shanghai, and Guangzhou. The factory is located in Sanyuan, Zhouzhi, Shaanxi Province and Changsha, Hunan Province. Now it has production workshops organized and built according to GMP standards, equipped with advanced vacuum drying equipment and spray drying equipment, as well as a number of advanced full set stainless steel plant extraction production lines and stainless steel pilot workshops. The production process is completely closed and production management is carried out in strict accordance with the SOP of each post. We have a group of high-quality and professional management personnel who strictly manage the production of traditional Chinese medicine in accordance with GMP standards. A sound production quality assurance system and comprehensive rules and regulations have enabled our product quality and technical indicator system to reach the international advanced level, thus meeting the needs of domestic and foreign markets. The company insists on; The purpose of quality, service, integrity, and development is to follow the principles of low-carbon and environmental protection. The brand has entered international markets such as Southeast Asia, South America, the Middle East, and Europe, providing important raw materials for the pharmaceutical, food, cosmetics, health products, and other manufacturing industries. It has won the trust of many customers at home and abroad, and has stable international customers in countries and regions such as the United States, Europe, Korea, Japan, South America, and Southeast Asia.

HQCHEALTH^®&HQCBEAUTY^® (plant extraction, production of

cosmetic raw materials and raw materials for functional healthcare products)

Website:www.sxhaiqiangchem.com

Raw materials for functional healthcare medicinal products:

E-mail：hqchealth@chinahaiqiangchem.com

Cosmetic raw materials：

E-mail：hqcbeauty@chinahaiqiangchem.com