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Ciprofloxacin powder is a broad-spectrum antibiotic belonging to the quinolone class of antibiotics. Molecular formula C17H18FN3O3, CAS 85721-33-1. It is a white to light yellow crystalline powder with a characteristic odor. Its appearance can be crystalline solid, crystal flakes or granules, depending on the preparation process and formula. It is soluble in polar solvents such as water, methanol, ethanol and dimethyl sulfoxide at room temperature. Its solubility is affected by temperature and pH. The pH range for higher solubility is 4 to 5.5. In non-polar solvents (such as n-hexane, acetone), the degree of solubility is low. It is soluble in polar solvents such as water, methanol, ethanol and dimethyl sulfoxide at room temperature. Its solubility is affected by temperature and pH. The pH range for higher solubility is 4 to 5.5. In non-polar solvents (such as n-hexane, acetone), the solubility is low. It is relatively stable at room temperature, but it is sensitive to light and easily decomposed by ultraviolet light. In addition, it will also be decomposed by factors such as high temperature, humidity and oxygen.
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Chemical Formula |
C17H18FN3O3 |
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Exact Mass |
331 |
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Molecular Weight |
331 |
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m/z |
331 (100.0%), 332 (18.4%), 333 (1.6%), 332 (1.1%) |
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Elemental Analysis |
C, 61.62; H, 5.48; F, 5.73; N, 12.68; O, 14.49 |
Ciprofloxacin, as a third-generation quinolone antibacterial drug, occupies an important position in clinical treatment due to its broad-spectrum antibacterial activity and unique bactericidal mechanism. It inhibits bacterial DNA gyrase and topoisomerase IV, blocking DNA replication, transcription, and repair processes, leading to bacterial death. The following is a systematic review of the core uses of ciprofloxacin from the four dimensions of infectious diseases treatment, special scenario application, combined drug strategy and medication precautions.
Ciprofloxacin has strong bactericidal effects on Gram negative bacteria (such as Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa) and some Gram positive bacteria (such as Staphylococcus aureus, Streptococcus), and also has certain activity against atypical pathogens such as Mycoplasma and Chlamydia. Its clinical application covers multiple systems in the human body:
Urinary and reproductive system infections
Urinary tract infection: Ciprofloxacin has a high concentration in urine and has significant therapeutic effects on simple or complex urinary tract infections (such as cystitis and pyelonephritis), especially for drug-resistant bacterial infections such as Escherichia coli and Pseudomonas aeruginosa.
Sexually transmitted diseases: As one of the preferred drugs for Neisseria gonorrhoeae urethritis or cervicitis, ciprofloxacin can quickly eliminate the pathogen and shorten the course of the disease.
Prostatitis: It has good therapeutic effects on bacterial prostatitis (especially chronic prostatitis), can penetrate prostate tissue, and inhibit the proliferation of pathogenic bacteria.
respiratory tract infection
Lower respiratory tract infection: Ciprofloxacin is effective against bronchitis and pneumonia caused by Streptococcus pneumoniae, Haemophilus influenzae, etc., especially for high-risk patients with hospital acquired pneumonia or Pseudomonas aeruginosa infection.
Upper respiratory tract infection: Although it has moderate efficacy in treating common upper respiratory tract infections such as pharyngitis and sinusitis in outpatient settings, it can be used as an alternative option for patients with drug-resistant bacterial infections or immunosuppression.
Gastrointestinal infection
Bacterial dysentery: Ciprofloxacin can inhibit pathogenic bacteria such as Shigella and Salmonella, and quickly alleviate symptoms such as diarrhea and fever.
Typhimurium and paratyphoid fever: It has a clear therapeutic effect on typhoid fever caused by Salmonella typhi infection, can shorten the fever period, and reduce the risk of complications.
Skin and soft tissue infections
Cellulitis and pustulosis: Ciprofloxacin can penetrate skin tissue and is effective against infections caused by Staphylococcus aureus, Streptococcus, etc., especially for drug-resistant bacterial infections or mixed infections.
Wound infection: In cases of wound or surgical wound infection, ciprofloxacin can be combined with debridement surgery to promote wound healing.
bone and joint infections
Osteomyelitis and arthritis: Ciprofloxacin can penetrate bone tissue and has therapeutic value for bone and joint infections caused by Staphylococcus aureus, Pseudomonas aeruginosa, etc. It is often necessary to combine other antibiotics or surgical interventions.
Systemic infection
Sepsis and bacteremia: Ciprofloxacin has a potent bactericidal effect on Gram negative bacteria (such as Escherichia coli and Klebsiella pneumoniae) in bloodstream infections, which can reduce mortality.
Abdominal infection: In infections such as abdominal abscess and peritonitis, ciprofloxacin can cover the gut microbiota and control the spread of infection.
Ciprofloxacin has the value of preventing infection in specific high-risk populations:
Infection prevention in immunosuppressed patients
Organ transplant recipients: Ciprofloxacin can be used to prevent post transplant lung or urinary tract infections, especially for high-risk patients with Pseudomonas aeruginosa.
Chemotherapy patients: During the period of granulocyte deficiency, ciprofloxacin can prevent Gram negative bacterial infections and reduce the risk of sepsis.
Selective intestinal purification
Preparation before colorectal surgery: Ciprofloxacin can be administered orally or intravenously to reduce the number of intestinal flora and postoperative infection rate, especially for the elderly or high-risk patients with diabetes.
Combination therapy strategy and synergistic effects
Ciprofloxacin is often used in combination with other drugs to expand the antibacterial spectrum or enhance efficacy:
Anti Helicobacter pylori treatment
Triple/quadruple therapy: Ciprofloxacin can replace clarithromycin or metronidazole, and is combined with proton pump inhibitors (such as omeprazole) and bismuth agents (such as potassium bismuth citrate) to form quadruple therapy, which improves the eradication rate of Helicobacter pylori, especially for drug-resistant bacterial infections.
Adjuvant drugs for anti tuberculosis treatment
Drug resistant tuberculosis: Ciprofloxacin is active against some drug resistant Mycobacterium tuberculosis and can be used as a second-line drug to shorten the course of treatment and reduce the recurrence rate.
Antifungal infection adjuvant therapy
Invasive fungal diseases: Ciprofloxacin can prevent or treat fungal infections combined with bacterial infections, especially for immunocompromised patients.
The synthesis of Ciprofloxacin powder can be accomplished through the following main steps:
The first step in the synthesis of Ciprofloxacin is the synthesis of glutaric acid as the main starting material. The glutaric acid can be synthesized through a series of steps such as aniline substitution reaction, acidification and cyclization.
In this step, glutaric acid is transformed into 3-aminoquinolone compounds through a substitution reaction. First, glutaric acid reacts with acetyl chloride to produce the corresponding acid chloride compound. Then, the acid chloride compound undergoes a cyclization reaction with aminopyrrolidinone (aminopyrrolidinone) to form a 3-aminoquinolone compound.
In this step, the 3-aminoquinolone compound undergoes a multi-step reaction to synthesize the levorotatory isomer of Ciprofloxacin. The main reactions include substitution reactions, oxidations, and cyclizations.
The dextrorotatory isomer of Ciprofloxacin is generated by stereoselective reduction of the left-handed isomer.
After mixing the left-handed isomer and the right-handed isomer, Ciprofloxacin is finally obtained through crystallization purification and other processing steps.
It should be noted that since the synthesis of Ciprofloxacin involves multiple steps and intermediates, and each step has different requirements for conditions and reactants, the entire synthesis process is very complicated. In addition, synthetic methods are subject to change and improvement due to advances in research and development.
Ciprofloxacin powder is a broad-spectrum antibiotic belonging to the quinolone class of antibiotics.
Functional group:
The molecule of Ciprofloxacin contains several key functional groups. It consists of a quinolone ring and a fluorine atom located on its ring. In addition, it has a carboxylic acid group and a piperazine group on a nitrogen-containing ring.
PH value and ionicity:
Ciprofloxacin shows weak acidity in aqueous solution with a pKa value of about 6.11. When the pH is lower than pKa, Ciprofloxacin exists in ionic form (negative ion), while when the pH is higher than pKa, Ciprofloxacin mainly exists in non-ionic form. This ionization state can affect the pharmacokinetic properties of the drug such as solubility, absorption, and distribution.
Thermal stability:
Ciprofloxacin has certain thermal stability. It is relatively stable at room temperature, but it will decompose at high temperature. According to literature reports, the decomposition temperature of Ciprofloxacin is about 258-260°C.
Photostability:
Ciprofloxacin is light sensitive and is easily decomposed by exposure to ultraviolet light. Therefore, exposure to light needs to be avoided during production, storage and use to maintain its chemical stability.
Chemical reaction:
Ciprofloxacin can participate in various chemical reactions. For example, it can undergo esterification reaction, acylation reaction and hydroxyl substitution reaction, etc. In addition, the fluorine atom of Ciprofloxacin also has certain chemical activity and may react with other functional groups under certain conditions.
Crystal transformation:
The crystal structure of Ciprofloxacin may be affected by factors such as temperature, humidity and solvents to undergo crystal transformation. Crystalline transitions can have important effects on properties such as solubility, stability, and bioavailability.
Other special properties:
Ciprofloxacin is an optically active compound with two chiral centers. Since commercially used Ciprofloxacin is a resolved mixture, it is usually expressed as an average optical rotation.
The above is the description of the main chemical properties of Ciprofloxacin. These properties are of great significance for understanding the pharmacokinetics, preparation process and drug compatibility of Ciprofloxacin.
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