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Sodium Sulfadiazine is a classical sulfonamide antimicrobial drug, chemically known as N-(2-pyrimidinyl)-4-aminobenzenesulfonamide sodium salt (C₁₀H₉N₄NaO₂S), a water-soluble sodium salt form of sulfadiazine. Its antibacterial mechanism is through competitive inhibition of bacterial dihydrofolate synthase (DHPS), blocking the utilization of para-aminobenzoic acid (PABA), thus interfering with the synthesis of folic acid, inhibiting the synthesis of bacterial nucleic acids and proteins, and exerting bacteriostatic effects.
Sodium sulfadiazine has broad-spectrum antimicrobial activity and is effective against both gram-positive (e.g., streptococci, staphylococci) and gram-negative bacteria (e.g., meningococci, Escherichia coli). It has been widely used in the past for the treatment of epidemic cerebrospinal meningitis, urinary tract infections, respiratory tract infections and burn wound infections. It is also used in the veterinary field to prevent and control bacterial diseases in livestock and poultry. In order to improve the efficacy, it is often used in combination with TMP to synergistically inhibit different aspects of bacterial folate metabolism (double blockade).
Its clinical use has declined due to increased bacterial resistance and the popularity of newer antibiotics, but it is still valuable in specific infections (e.g., nocardiosis, toxoplasmosis). Major adverse reactions include allergic reactions (rash, fever), crystalluria (alkalinization of urine and drinking plenty of fluids are required for prevention), hepatorenal toxicity, and hematologic abnormalities (granulocytopenia). Renal function needs to be monitored when using it and avoiding combining it with acidic drugs. Although modern antibiotics have partially replaced sulfonamides, sulfadiazine sodium retains its importance in some medical and veterinary fields because of its low cost and efficacy.
Additional information of chemical compound:
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Chemical Formula |
C10H9N4O2S- |
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Exact Mass |
249.05 |
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Molecular Weight |
249.27 |
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m/z |
249.05(100.0%),250.05 (10.8%), 251.04 (4.5%), 250.04 (1.5%) |
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Elemental Analysis |
C, 48.18; H, 3.64; N, 22.48; O, 12.84; S, 12.86 |
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Melting point |
>300℃ |
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Storage conditions |
2-8℃ |
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Sodium sulfadiazine,It is an important intermediate acting sulfonamide antibiotic. The following is a detailed explanation of its purpose:
This substance can also be used to treat intestinal infections and skin and soft tissue infections. These infections are usually caused by bacteria such as Klebsiella, Salmonella, Shigella, etc. When treating these infections, its administration method and dosage need to be determined according to the condition and the specific situation of the patient. Star shaped Nocardia is a chronic suppurative granulomatous disease caused by star shaped Nocardia. This substance has antibacterial effects on star shaped Nocardia and can therefore be used to treat the disease. When treating Star shaped Nocardia, it requires long-term administration and regular monitoring of indicators such as liver and kidney function and blood routine in patients.
Treatment of toxoplasmosis and adjuvant therapy for malignant malaria
This substance can be used as a secondary drug for treating cervicitis and urethritis caused by Chlamydia trachomatis. When treating these diseases, its administration method and dosage need to be determined according to the patient's condition and specific circumstances. Meanwhile, as Chlamydia trachomatis can be transmitted through sexual contact, patients need to avoid sexual activity during treatment and take necessary preventive measures. For malignant malaria patients resistant to chloroquine, it can be used as an adjuvant therapy drug. When treating malignant malaria, it is usually necessary to use it in combination with other antimalarial drugs to improve efficacy and reduce drug resistance.
This substance can be used in combination with ethambutol to treat toxoplasmosis caused by Toxoplasma gondii in mice. When treating toxoplasmosis, patients need to take it and pyrimethamine for a long time, and regularly monitor indicators such as liver and kidney function and blood routine. Meanwhile, as toxoplasmosis can be transmitted through multiple pathways, patients need to take necessary preventive measures during treatment to avoid cross infection.
The drug interaction of this compound
Combined use with urine alkalizing drugs: The combination of urine alkalizing agents can increase the solubility of Sodium sulfadiazine in alkaline urine, leading to increased excretion. Therefore, when using sulfamethoxazole sodium, it can be considered to be used in combination with urine alkalizing drugs to reduce the occurrence of urine crystallization.
Combined with para aminobenzoic acid：Aminobenzoic acid can replace the substance and be taken up by bacteria, and the two are mutually antagonistic. Therefore, when using sulfamethoxazole sodium, it should be avoided to use it in combination with p-aminobenzoic acid.
Used in combination with oral anticoagulants, oral hypoglycemic drugs, etc：This substance can replace the protein binding sites of these drugs or inhibit their metabolism, resulting in enhanced drug action, prolonged duration, or increased toxicity. Therefore, when using, it is necessary to pay attention to the interactions with these drugs and adjust the dosage and frequency of administration as needed.
Combined use with bone marrow suppressants：When used in combination with bone marrow suppressants, this substance may enhance the potential toxic side effects of such drugs. Therefore, when both types of drugs need to be used simultaneously, the possible toxic reactions should be closely observed, and the dosage and frequency of administration should be adjusted as needed.
Combined with contraceptive pills：Long term use of this substance with contraceptive pills (estrogens) can reduce the reliability of contraception and increase the chance of menstrual bleeding. Therefore, during use, patients need to pay attention to taking other contraceptive measures to avoid unintended pregnancy.
Combined with thrombolytic drugs：When used in combination with thrombolytic drugs, this substance may increase its potential toxic effects. Therefore, when it is necessary to use both types of drugs simultaneously, the pros and cons should be weighed before deciding whether to use them, and the patient's condition should be closely monitored for changes.
Co administration with hepatotoxic drugs：When used in combination with hepatotoxic drugs, this substance may increase the incidence of hepatotoxicity. Therefore, during use, patients need to avoid using other drugs with hepatotoxicity and closely monitor changes in liver function.
As a spectral probe: reporting the environment and dynamics of the membrane
Sodium Sulfadiazine (SDS), as a medium acting sulfonamide antibacterial drug, has shown potential application value in the field of spectral probes due to its unique spectral characteristics and interactions with nanomaterials such as quantum dots.Spectral probe technology achieves qualitative and quantitative analysis of target molecules by detecting signal changes generated by the interaction between substances and light, and is widely used in fields such as environmental monitoring, biomedicine, and food safety. Traditional spectral probes rely heavily on organic dyes or metal complexes, but suffer from issues such as poor photostability and low sensitivity. In recent years, semiconductor quantum dots (QDs) have become ideal probe carriers due to their unique optical properties, such as high fluorescence quantum yield and adjustable emission wavelength. However, the stability of quantum dot surface ligands directly affects their performance, and SDS, as a sulfonamide antibacterial drug, can significantly alter its fluorescence properties through interaction with quantum dot surface ligands, providing a new pathway for the development of novel spectral probes.
The mechanism of SDS as a spectral probe
The molecular structure of SDS contains sulfonamide groups and pyrimidine rings, and its negative charge allows it to adsorb onto positively charged quantum dot surfaces through electrostatic interactions. Research has shown that in pH 7.4 phosphate buffer solution (PBS), the concentration of SDS is linearly negatively correlated with the fluorescence intensity of ZnS: Mn quantum dots, with a linear range of 6.25 × 10 ⁻⁶ to 3.75 × 10 ⁻⁴ mol/L, a correlation coefficient of r=0.998, and a detection limit of 3.86 × 10 ⁻⁶ mol/L. This fluorescence quenching effect originates from the conformational changes of ligands (such as thioglycerol) on the surface of quantum dots induced by SDS, leading to a decrease in electron transfer efficiency and thus weakening fluorescence emission.
Fluorescence quenching mechanism
The fluorescence quenching of quantum dots by SDS follows a static quenching mechanism, that is, SDS forms non fluorescent complexes with quantum dots, rather than energy transfer caused by dynamic collisions. Through Job's plot and temperature dependent experiments, it was confirmed that the binding ratio of SDS to quantum dots is 1:1, and the binding constant K is 1.2 × 10 ⁴ L/mol, indicating that the two form stable complexes through electrostatic attraction.
In competitive experiments, the fluorescence interference of common ions (such as Na ⁺, K ⁺, Cl ⁻) and biomolecules (such as glucose and amino acids) on SDS quantum dot systems can be ignored, while structurally similar sulfonamide drugs (such as sulfamethoxazole) only produce slight interference when the concentration exceeds 10 times SDS. This characteristic makes SDS quantum dot probes highly selective in complex matrices.
The influence of environmental factors on probe performance
The fluorescence intensity of SDS quantum dot system increases with the increase of pH in the range of pH 5.0-9.0, and the peak appears at pH 7.4. Under acidic conditions (pH<6), the sulfonamide groups of SDS undergo protonation, weakening their electrostatic binding with quantum dots; Under alkaline conditions (pH>8), the surface ligands of quantum dots undergo deprotonation, resulting in a decrease in SDS adsorption capacity. Therefore, physiological pH conditions (pH7.4) are the optimal application environment for this probe.
Temperature and Ionic Strength
temperature effect
The fluorescence quenching efficiency decreases with increasing temperature in the range of 25-45 ℃, indicating that high temperature weakens the binding ability between SDS and quantum dots. This phenomenon may be related to the increased molecular thermal motion caused by temperature rise, leading to a decrease in the stability of the complex.
ionic strength
High ionic strength (such as adding 0.1 M NaCl) can shield the electrostatic interaction between SDS and quantum dots, leading to a decrease in fluorescence quenching efficiency. By adding ion strength modulators (such as polyethylene glycol), this interference can be effectively alleviated, improving the applicability of the probe in physiological saline or high salt environments.
SDS can undergo photodegradation under 254 nm ultraviolet light, producing sulfonamide and pyrimidine products. Quantum dots, as photocatalysts, can accelerate the photolysis reaction of SDS, leading to probe signal attenuation. By optimizing the surface modification of quantum dots (such as introducing a silicon dioxide coating), the photostability of the probe can be significantly improved and its lifespan can be extended.
Frequently Asked Questions
Q: Why is sodium sulfadiazine incompatible with many acidic injections in clinical use?
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A: Sodium sulfadiazine is a strongly alkaline salt solution. When mixed with acidic injections (e.g., vitamin C, glucose with vitamin C, procaine hydrochloride, tetracycline hydrochloride), the free sulfadiazine base precipitates rapidly as a white flocculent precipitate, which can cause vascular irritation, embolism risk, and loss of antibacterial activity.
Q: Does sodium sulfadiazine affect thyroid function tests? If so, how?
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A: Yes. It can reversibly reduce the uptake of radioactive iodine (¹³¹I) by the thyroid gland and may increase protein-bound iodine levels, leading to false hypothyroidism or abnormal thyroid test results. This effect is temporary and unrelated to true thyroid injury.
Q: Why is sodium sulfadiazine more likely to cause crystalluria than sulfamethoxazole (SMZ) at the same dosage?
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A: Sodium sulfadiazine has lower solubility in acidic urine. Its acetylated metabolite is also poorly soluble. In comparison, SMZ and its metabolites have better solubility. Therefore, even at equivalent doses, sulfadiazine forms crystals more easily in renal tubules without adequate hydration and urine alkalization.
Q: Can sodium sulfadiazine be used in patients with porphyria? Why?
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A: It is not recommended. Sulfonamides including sulfadiazine can induce porphyric crises by stimulating δ-aminolevulinic acid (ALA) synthase and promoting excessive accumulation of porphyrins, which may worsen abdominal pain, neuropathy, and skin photosensitivity in porphyria patients.
Q: Does sodium sulfadiazine have direct antifungal activity?
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A: No. It acts only against susceptible bacteria (e.g., Streptococcus, Shigella, Toxoplasma gondii). It has no inherent fungicidal or fungistatic effect. Clinical use in fungal infections is either off-label combination or misapplication, not based on direct antifungal mechanism.
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