Introduction
Drug quality directly affects public health. In the pharmaceutical industry, analytical testing technology plays a vital role in quality control from raw materials to finished products. UV-Vis spectrophotometry is one of the major analytical methods included in pharmacopoeias worldwide, valued for its maturity, simple operation, and wide instrument availability.
According to the Chinese Pharmacopoeia (2020 edition), UV-Vis spectrophotometry can be used for drug identification, testing, and content determination. STON Technologies' NanoQuant series spectrophotometers fully meet pharmacopoeia requirements, providing reliable testing tools for pharmaceutical enterprises.
Drug Content Determination
The most widespread application of UV-Vis spectrophotometry is content determination of APIs and pharmaceutical formulations. Most organic drug molecules contain aromatic rings or conjugated systems with characteristic absorption in the UV or visible region:
- Acetaminophen: Maximum absorption at 257nm for direct tablet assay
- Vitamin C: Characteristic absorption at 245nm in acidic medium for content and stability studies
- Aspirin: Absorption at 276nm for enteric-coated and sustained-release formulations
- Ibuprofen: Characteristic absorption peaks at 264nm and 272nm
- Metronidazole: Characteristic absorption at 319nm for injections and tablets
The NanoQuant1810 and NanoQuant1920 spectrophotometers offer photometric accuracy of ±0.002A (0-0.5A), meeting the stringent requirements of pharmaceutical content determination.
Dissolution Testing
Dissolution testing is a critical indicator for evaluating the quality of solid dosage forms. UV-Vis spectrophotometry is a commonly used detection method in dissolution testing. With its automatic scanning function, the NanoQuant1920 can rapidly complete dissolution measurements of multiple samples at different time points, providing timely data support for formulation development and QC.
Drug Identification and Purity Testing
- Identification: Using spectral characteristics including maximum absorption, minimum absorption, and shoulder peaks at specific wavelengths
- Impurity Testing: Examining related substances and degradation products in APIs at specific wavelengths
- Content Uniformity: Checking content uniformity of low-dose formulations
Stability Study Application
Drug stability studies are essential for determining shelf life and storage conditions. UV-Vis spectrophotometry can be used for:
- Monitoring content changes during accelerated and long-term stability testing
- Analyzing the emergence and growth trends of degradation products and impurities
- Evaluating the impact of packaging materials on drug quality
Technical Advantages of STON Spectrophotometers
- NanoQuant1920 Double Beam: 5 selectable slit widths, baseline flatness ±0.0005A, effectively eliminates errors from source fluctuations. Auto light-seeking technology eliminates tedious adjustments after lamp replacement.
- NanoQuant1810 Ratio Dual-Beam: 1600 lines/mm holographic grating, stray light ≤0.03%T, built-in GLP self-verification for wavelength and photometric accuracy calibration.
- Data Management: USB output for PDF/Excel, Email transmission, 8-inch touch screen, meeting pharmaceutical industry data integrity requirements.
Conclusion
UV-Vis spectrophotometry is a mature and reliable analytical technique in pharmaceutical analysis. STON Technologies' NanoQuant series spectrophotometers provide pharmaceutical enterprises with compliance-ready testing solutions through excellent optical performance and stable data output.
