Benzathine benzylpenicillin-Shandong Huashang Chemical Co., Ltd.

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Benzathine benzylpenicillin

Brand：HS

Model：25kg/drum

Purity：99%

Cas：1538-09-6

Createtime： 2026-04-14
Updatetime： 2026-04-15

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Product Details

useage	Industrial use
deliveryInfo
appearance	powder
Molecular Weight	909.12
aliasen
supplyCapacity	50000MT/Month
harbor	Qingdao,China
minorder	1KG
Appearance	White or off-white crystalline powder

Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and sales of fine chemicals. Headquartered in Jinan, Shandong, China, we are committed to delivering high-quality products to our global partners. Currently, over 90% of our products are exported to developed markets, including North America, Europe, Japan, South Korea, and the Middle East.

Basic Information

Product Name: Benzathine benzylpenicillin; Alias: Benzathine Penicillin G, Benzethacil, Benzathine Penicillin, Bicillin, Long-acting Penicillin, Dibenzylethylenediamine Penicillin, Benzylpenicillin Benzathine Salt

CAS Number: 1538-09-6 (MDL: MFCD00010787; EINECS: 216-258-6)

Molecular Formula: C??H??N?O?S?

Molecular Weight: 909.12 g/mol

Structural Formula: Bis(benzylpenicilloyl)dibenzylethylenediamine (a long-acting penicillin compound, formed by the combination of two molecules of benzylpenicillin and one molecule of benzathine, with β-lactam ring and thiazolidine ring functional groups)

Classification: Long-acting penicillin antibiotic, pharmaceutical raw material, antibacterial drug, organic heterocyclic compound, injectable pharmaceutical intermediate, β-lactam antibiotic

Physical & Chemical Properties

Benzathine benzylpenicillin is a white or off-white crystalline powder, odorless, tasteless, and practically insoluble in water, ethanol, chloroform and ether; slightly soluble in dimethylformamide, and soluble in dilute acids and dilute alkalis. Its pKa value is 5.1 (predicted), showing weak acidity. It is stable under normal temperature and pressure, but is sensitive to heat, moisture and light—long-term exposure to high temperature (above 200°C) or humidity may cause decomposition, and light exposure may lead to reduced activity. Its density is 1.32±0.06 g/cm3 (25°C, predicted), melting point is 129-133°C (melting with decomposition), and vapor pressure is <0.0001 mmHg at 25°C with a LogP of 4.8 at 20°C. It has no obvious hygroscopicity, but it is easy to decompose when in contact with moisture for a long time, so it needs to be stored in a dry environment.

Key physical and chemical parameters are detailed in the specification table below, meeting the requirements of high-purity pharmaceutical grade (USP/ChP), injection grade and research grade.

Main Uses

Benzathine benzylpenicillin is a long-acting penicillin antibiotic, which can slowly release benzylpenicillin after intramuscular injection, maintaining effective blood drug concentration for a long time. It has broad-spectrum antibacterial activity and is mainly used in the prevention and treatment of bacterial infections, as well as related research fields:

Pharmaceutical Industry: Used as a raw material for long-acting antibacterial drugs, mainly used for the prevention of rheumatic fever recurrence, treatment of all stages of syphilis, and control of the prevalence of streptococcal infections. It is also used for the long-term preventive administration of patients with rheumatic heart disease and rheumatic fever. It cannot replace penicillin G for the treatment of severe acute infections, and is clinically made into injectable powders for intramuscular injection.
Injection Preparation: Key raw material for the synthesis of injectable benzathine benzylpenicillin preparations (injection powders), with specifications including 300,000 U, 600,000 U, and 1.2 million U. It is used to produce high-purity injectable formulations that meet international pharmacopoeia standards (USP/ChP), ensuring drug efficacy and clinical safety.
Medical Research: Used as a research reagent in microbiology and pharmacology experiments, including bacterial sensitivity testing, research on the antibacterial mechanism of long-acting penicillin drugs, and in vitro drug screening for streptococcal infections and syphilis. It is also used in preclinical research on new long-acting antibacterial drugs and evaluation of drug safety and efficacy.
Clinical Auxiliary Application: Used as a long-term preventive drug for patients with recurrent streptococcal infections, such as tonsillitis, pharyngitis, and urinary tract infections caused by sensitive bacteria, to reduce the recurrence rate of infections and improve the therapeutic effect.

Packaging & Storage

Packaging Method

Lab/Research Grade: 10mg, 1g, 5g, 10g sealed glass bottles or aluminum foil bags (filled with inert gas); 100g, 500g HDPE plastic bottles with PTFE liners, suitable for laboratory research and small-batch testing.

Pharmaceutical Grade & Injection Grade: 100g, 500g, 1kg sealed glass bottles (filled with nitrogen); 5kg, 25kg galvanized iron drums with PTFE liners and nitrogen-sealed; customized packaging available per customer requirements (such as 10ml, 20ml vials for injection-grade preparations), complying with GMP standards for pharmaceutical raw materials and injection specifications.

Storage Method

Store in a cool, dry, dark, and well-ventilated warehouse at a temperature of 2-8°C (refrigerated storage recommended). Keep containers tightly sealed and protected from light to prevent moisture absorption, oxidation and decomposition, and avoid reduction of drug activity. Avoid contact with water, strong oxidants, strong acids and strong bases; keep away from fire, heat sources, and direct sunlight. The injection powder should be freshly prepared before use, and the prepared suspension should be used immediately. It is sensitive to moisture and light, so strict moisture-proof, anti-light and low-temperature measures must be taken. Shelf life is 24 months under standard sealed, low-temperature, and dry storage conditions (complying with GMP storage requirements for pharmaceutical drugs).

Comprehensive Specification Table

Item	Specification	Unit	Remarks
Product Name	Benzathine benzylpenicillin	—	Alias: Bicillin, Long-acting Penicillin; Long-acting β-lactam antibiotic
CAS Number	1538-09-6	—	MDL: MFCD00010787; EINECS: 216-258-6; PubChem: 5359340
Molecular Formula	C??H??N?O?S?	—	Long-acting penicillin compound; with β-lactam ring and thiazolidine ring
Molecular Weight	909.12	g/mol	Theoretical calculation value; consistent with USP/ChP standards
Appearance	White or off-white crystalline powder	—	Odorless, tasteless; non-hygroscopic; stable under normal conditions
Purity	≥99.0 (Pharmaceutical Grade); ≥98.0 (Research Grade); ≥98.5 (Injection Grade)	%	Meets USP/ChP standards; ≥98.0% calculated on dried basis
Melting Point	129-133	℃	Literature value; melts with decomposition; consistent with ChP standards
Boiling Point	980.5±65.0 (760 mmHg)	℃	Predicted value; decomposes before complete boiling
Solubility	Practically insoluble in water, ethanol, chloroform; soluble in dilute acids and alkalis	—	Slightly soluble in dimethylformamide; insoluble in ether and hexane
Density	1.32±0.06 (25°C)	g/cm3	Predicted value at room temperature; crystalline solid state
Main Impurities	≤0.3 (Pharmaceutical Grade); ≤1.0 (Research Grade); ≤0.5 (Injection Grade)	%	Including moisture, synthetic intermediates, degradation products and heavy metals (≤10ppm)
Main Uses	Long-acting antibacterial drug, pharmaceutical raw material, injection raw material, research reagent	—	Prevention of rheumatic fever, treatment of syphilis, streptococcal infection control; medical research
Packaging Method	10mg-1kg bottles/bags; 5kg-25kg iron drum; 10-20ml injection vials	—	GMP compliant; sealed, moisture-proof, light-proof; filled with inert gas or nitrogen
Storage Method	2-8°C, cool, dry, dark, sealed; away from moisture/oxidants/acids/bases; avoid light	—	Shelf life 24 months; GMP storage; injection powder prepared freshly before use