Chemwill Asia co.,Ltd is one of the leading manufacturer in CHINA.Our main production base is located in Xuzhou industry park. We produce a wide range of organics including Active pharmaceutical ingredients(APIs), Veterinary, Indole derivatives, Aromatics, Fluorine, Boronic acids, organocatalysts, chiral building blocks, heterocyclic compounds. We are certified both to the ISO 9001 and ISO 14001 Standards, have a safety management system in place.Our R&D team masters core technology for process-design of target building block as well as Tailor-made fine chemicals. We have Strong quality control system: Strength of our ethical commitment to quality control and quality assurance systems firmly based on ISO standard. QA and QC used in the whole process of raw materal control, process control and finished product quality inspection. 

1.client is first.

2.credibility is the most important.

3.quality control is our life.

4.great sense of responsibility.

5.we will be responsible for not only our products, our clients, also the society.

The corporation's destination: we will constantly strive to supply customers with new and high-tech products and will keep the leadership in the field. 

L-Tyrosine was discovered from casein by Li Bigge in 1846. It is a white crystalline powder that crystallizes from water into spicles or sheets. The relative density is 1.456(20℃), the isoelectric point is 5.66, it has the ability to absorb ultraviolet light, and has the maximum light absorption at the wavelength of 274nm. It can reduce phosphomolybdate - phosphotungstate reagent (Flin reagent). Melting point: decomposition of levo-spin at 290 ~ 295℃ (slow heating), decomposition of levo-spin at 314 ~ 318℃ (fast heating), decomposition of racemate at 290 ~ 295℃ (slow heating), decomposition of levo-spin at 340℃ (fast heating). Soluble in water, ethanol, acid and base, insoluble in ether. Dextral aqueous solution reacts with tyrosinase in red. Left-handed triboluminescence, heated with barium hydroxide aqueous solution at 170℃ into racemate, phenolic hydroxyl o-position in tyrosine molecules prone to biochemical reaction, coupled with diazobenzene sulfonic acid to get orange-red material, with boiling dilute acetic acid and sodium nitrite, with warm nitric acid, Chemicalbook yellow. Dark orange yellow in sulfuric acid with titanium dioxide. Natural tyrosine is left-handed and can be hydrolyzed and refined from protein. Tyrosine is a kind of non-essential amino acid, which is the raw material of many kinds of products in the body. Tyrosine can be transformed into many physiological substances in the body through different metabolic pathways, such as dopamine, adrenaline, thyroxine, melanin and papaverine of poppy (opium). These substances are closely related to nerve conduction and metabolic regulation. Studying tyrosine metabolism helps to understand the pathological process of some diseases. For example, uromelanosis is related to tyrosine metabolism disorder. The lack of uromelanosis oxidase in the patient leads to uromelanosis, the metabolite of tyrosine, which can not continue to decompose, and is discharged from the urine when oxidized into black matter in the air. The diapers of children with this disease will gradually turn black when exposed to the air, and this urine will also turn black for a long time. Albinism is also associated with tyrosine