Estriol CAS 50-27-1 Anti Estrogen Steroids 99%

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Product name Estriol
CAS NO 50-27-1
Purity 99%
MF C18H24O3
MW 288.38
EINECS 200-022-2
Appearance White Powder
Usage Anti estrogen steroids , primary estrogen in urine . A metabolite of Estradiol . Used to treat leukopenia , also have a certain effect for prostatic hypertrophy , prostate cancer .
Synonyms TRIDESTRIN; (16-alpha, 17-beta)-estra-1,3,5(10)-triene-3,16,17-triol; (16alpha, 17beta)-Estra-1,3,5(10)-triene-3,16,17-triol; (16-alpha, 17-beta)-oestra-1,3,5(10)-triene-3,16,17-triol; (16alpha, 17beta)-Oestra-1,3,5(10)-triene-3,16,17-triol; 1,3,5-estratriene-3-beta, 16-alpha, 17-beta-triol; 1,3,5-Estratriene-3beta, 16-alpha, 17-beta-triol; 1,3,5-oestratriene-3-beta, 16-alpha, 17-beta-triol
Categories Steroids; Hormone; Biochemistry; Hydroxysteroids; Intermediates& Fine-Chemicals; Metabolites& Impurities; Pharmaceuticals; Steroid-and-Hormone; API; THEELOL; Hormone Drugs; Inhibitors

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Description of Estriol

1. Estriol belongs to natural hormone and is the metabolite of estradiol in vivo , anti estrogen steroids . It is mainly presented in the urine . Estrogen has a relative small activity with the oral activity being 6 times as high as estrone but being weaker than estradiol with non-carcinogenic effects . After its administration , the in vivo estradiol levels did not change . Estriol has selective action on the vaginal and cervical canal but has no effect on the uterus and endometrium entity .
2. Animal experiments have shown that estriol has a stronger effect on vaginal epithelial keratosis than estradiol , thus being able to promote vaginal epithelial hyperplasia , superficial cells keratosis , mucosal angiogenesis and vaginal epithelial wound healing , but having a weak effect on the weight gain of mouse uterus . At the same time , estriol can enhance the function of cervix cell , causing the cervix muscle fiber hyperplasia and increasing the cervical elasticity and softness .
addition , estriol has feedback inhibition on the hypothalamus and pituitary but does not inhibit ovulation while only having significant impact on the corpus luteum and therefore can be used as the auxiliary drug in the medium-term labor induction and artificial abortion and for the treatment of various kinds of menopathy . Estriol also has significant effect on the hematopoietic system and can reduce vascular permeability and fragility. Therefore , it can be used for the treatment of various kinds of hemorrhage . It also has effect of rapidly increasing the peripheral leukocytes and generally begins to take effect at 1 to 3 days after treatment but with a shorter duration of action and is effective in treatment the leukopenia induced by radiotherapy and chemotherapy .
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COA

Items of analysis	Specification	Results
Appearance	White to practically white, odorless, crystalline powder.	White crystalline powder, odorless
Identification	A: IR B: UV	Conforms
Melting point	About280℃	281.5℃
Solubility	Insoluble in water; sparingly soluble in alcohol; soluble in acetone, in chloroform, in dioxane, in ether, and in vegetable oils	Conforms
Completeness of solution	The solution is clear and free from undissolved solid.	Conforms
Loss on drying	≤0.5%	0.26%
Specific optical rotation	+54°～ +62°	+57.07°
Total impurities	≤2.0%	Conforms
Residue on ignition	≤0.1%	0.06%
Assay	Assay	98.63%
Conclusion	Qualified

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Estriol application

1. It can be used for treating cervicitis and especially suitable for treating menopausal syndrome and senile vaginitis .
2. It can also be used as the adjuvant drug for middle-term labor induction and artificial abortion .
3. It can also be used for treating prostatic hypertrophy and prostate cancer .
4. It still has a rapid role in increasing the peripheral leukocytes. It generally takes effect at 1 to 3 days after the treatment but with a short duration period . It also has efficacy in treating leukopenia caused by chemotherapy or radiotherapy .
5. It can be used for reducing the vascular permeability and fragility and can be used for the treatment of various kinds of hemorrhage . It also has quick hemostasis effect on menorrhagia , hysterectomy or tonsillectomy .