L Cystine CAS 56-89-3

Basic Info

Model No.: CAS NO 56-89-3

CAS: 56-89-3

Name:: L-Cystine

MF:: C6H12N2O4S2

MW:: 240.30000

MP:: 260-261ºC

Bp:: 468.2ºC At 760 MmHg

Additional Info

Packaging:  25kg/Drum

Productivity: 10000kg

Brand: zhishang

Transportation: Ocean,Land,Air

Place of Origin: Shandong, China (Mainland)

Supply Ability: in stock

Certificate: ISO CE

HS Code: 87-66-1

Port: Shanghai,Tianjin,Qingdao

Product Description

L-Cystine CAS 56-89-3

Production methods

1. l – cystine was found from bladder stones by wollston in 1810. In 1832, berzelius named it cystine, a sulfur-containing amino acid found in small amounts in proteins, mostly in keratin, such as hair and fingers. Synthetic method can also be used. Industrial extraction from hair, yield up to 7.5 – 8 %. In actual production only 5 %.

2. hydrolyze pig hair in hydrochloric acid, filtering to remove impurity, crystallizing to obtain crude product, decolorizing with activated carbon, remove iron, washing, and drying.

3. 720 kg of hydrochloric acid with a concentration of 10 mol / l is added into a hydrolysis tank, heated to 70 – 80 deg c, quickly put into human hair or pig 400 kg, continuously heated to 100 deg c, heated to 110 – 117 deg c within 1 – 1.5 h, hydrolyzed for 6.5 – 7 h ( counting from 100 deg c ), cooled and filtered. Adding 30 to 40 percent of industrial sodium hydroxide solution into the filtrate under stirring, adding alkali liquor at a reduced speed until the ph value reaches 3.0, standing for 36h, separating and precipitating, centrifuging and drying to obtain cystine crude product ( I ), wherein the mother liquor contains glutamic acid, arginine, leucine and the like. Weigh 150 kg of crude cystine ( I ), adding about 90 kg of 10 mol / l hydrochloric acid and 360 kg of wat, heating to 65 – 70 deg c, stirring and dissolve for 0.5 h, adding 12k g of active carbon, heating to 80 – 90 deg c, keeping that temperature for 0.5 h, and carrying out plate and frame pressure filtration. Heating the filtrate to 80 – 85 deg c, adding 30 % sodium hydroxide while stirring, and stopping at ph 4.8. Standing, precipitating crystals, siphoning supernatant, separating bottom precipitate, and then centrifuging to dry to obtain crude cystine ( ii ). Weigh 100 kg of crude cystine ( ii ), adding 500 l of 1 mol / l hydrochloric acid, heat to 70 deg c, and adding 3 – 5 kg of active carbon. Then raise that temperature to 85 deg c, keeping the temperature and stir for 0.5h, and carrying out plate and frame pressure filtration. Adde distilled wat with volume about 1.5 times of that filtrate into the filtrate, heating to 75 – 80 deg c, neutralizing with 12 % ammonia wat to ph 3.5 – 4.0 under stirring, and crystallizing cystine. Centrifuge crystallization, drying, was with distilled water until no chloride ions exist, and vacuum drying to obtain cystine product. The yield of human hair can reach 8 %, and the yield of pig hair can reach 5 %.


L-cystine is a nutritional supplement. Milk powder for milk powder. Non-essential amino acids. It is essential for skin and hair to promote surgery and trauma. Stimulate hematopoietic function, promote leukocyte formation. It has the function of promoting the oxidation and reduction of body cells, and can also be used as additives in cosmetics, which can promote wound healing, prevent and cure skin allergy and treat eczema.

Packaging & Shipping

25 kg box/bag/drums

Transit could be DHL,UPS,TNT,EMS,Fedex,and so on.

For mass orders, it will be delivered by air or sea.

Depending on 

your location, please allow 1-5 business days for your order to arrive.

For small order, please expect 3-7 days by UPS DHL EMS.

For mass order, please allow 5-8 days by Air, 15-30 days by Sea.

Product expansion

1> Cosmetic Raw Materials: Cosmetics is a variety of raw materials through a reasonable deployment of processing from the compound mixture. Cosmetics with a wide range of raw materials, different performance. According to the Raw Material properties and uses of cosmetics, can be divided into matrix materials and auxiliary raw materials in two categories.

2> Active Pharmaceutical Ingredients(API): API refers to the raw materials in the production of various types of preparations, which is the active ingredient in powder,crystal and paste for medicine use through chemical synthesis,plant extract, and preparations of biotechnology institute.

3> Fragrance And Spices: Spices are an important part of fine chemicals, it is composed of natural spices, synthetic spices and single fragrance.

4> Organic Raw Material: Intermediates are also known as organic intermediates. The use of coal tar or petroleum products as raw materials to produce dyes, resins, additives, and other intermediates.

5> Chemicals Used In Paints: Paint, the traditional Chinese name is paint. So-called coating is coated on the surface of the object that be protected or be adornment, and with the continuous film coating to form strong adhesion.

6> Pharmaceutical Intermediates: The so-called pharmaceutical intermediates, refers to the production of pharmaceutical products in the process, the use of raw materials, materials, accessories and other intermediate products.

7> Agricultural Chemicals: Research and agriculture related chemical, including pesticide, plant growth regulator, fertilizer, compound fertilizer, herbicide etc.

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