China Gold Supplier for Levetiracetam - Tacrolimus FK-506 Fujimycin CAS 104987-11-3 API High Purity – Ruifu

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China Gold Supplier for Levetiracetam - Tacrolimus FK-506 Fujimycin CAS 104987-11-3 API High Purity – Ruifu Detail:

Manufacturer with High Purity and Stable Quality
Chemical Name: Tacrolimus
Synonyms: FK-506; Fujimycin
CAS: 104987-11-3
API, High Quality, Commercial Production

Chemical Name Tacrolimus
Synonyms FK-506; Fujimycin
CAS Number 104987-11-3
CAT Number RF-API46
Stock Status In Stock, Production Scale Up to Tons
Molecular Formula C44H69NO12
Molecular Weight 804.02
Brand Ruifu Chemical
Item Specifications
Appearance Off-White or Pale Yellow Fine Powder, Odourless, Special Sweet Taste
Identification Should be Positive Reaction
Clarity Comply with the Standard
pH 5.0~6.0
Chloride ≤0.014%
Sulphate ≤0.029%
Heavy Metals (Pb) ≤10ppm
Arsenic ≤0.0002%
Moisture (K.F) ≤8.0%
Residue on Ignition 18.0%~22.0%
Assay ≥72.0% (HPLC, on the dried basis)
Test Standard Enterprise Standard
Usage API

Package: Bottle, Aluminum foil bag, Cardboard drum, 25kg/Drum, or according to customer’s requirement.

Storage Condition: Store in sealed containers at cool and dry place; Protect from light, moisture and pest infestation.

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Tacrolimus (also FK-506 or Fujimycin) is an immunosuppressive drug whose main use is after organ transplant to reduce the activity of the patient’s immune system and so the risk of organ rejection. It is also used in a topical preparation in the treatment of severe atopic dermatitis, severe refractory uveitis after bone marrow transplants, and the skin condition vitiligo. Tacrolimus was first extracted from the fermentation broth of Streptomyces tsukuba, a soil microbe found in Tsukuba, Japan. The name tacrolimus is derived by taking the ‘t’ for Tsukuba, the name of the mountain where the soil sample was extracted, ‘acrol’ for macrolide and ‘imus’ for immunosuppressant. Although structurally unrelated to cyclosporin, tacrolimus shows a similar spectrum of immunosuppressive effects to this agent at the cellular and molecular level. Initial studies indicated that tacrolimus was a powerful immunosuppressant, displaying approximately 100-fold greater in vitro potency than cyclosporin in inhibiting T cell activation. Subsequent in vivo studies have shown tacrolimus to be effective both in suppressing spontaneous and experimental autoimmune disease, and in preventing allograft and xenograft rejection in animal models of organ transplantation. Initially, tacrolimus was used for systemic immunosuppression of patients who had undergone allograft transplants to stop them from rejecting their new grafts. Soon, however, through the benefit of the serendipity of science, it was noticed that tacrolimus could produce favorable results in skin disorders in some of the patients who had undergone transplantation. The discovery of tacrolimus has thus lead to greater understanding of skin pathology, for example of atopic dermatitis. Subsequently, other topical applications of tacrolimus were reported and the use of this agent in dermatology is gradually expanding.


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