Near-infrared (NIR) assay and content uniformity of tablets
Applications | | MetrohmInstrumentation
This study addresses the need for rapid and non-destructive testing of tablet content uniformity. Near-infrared (NIR) spectroscopy aligns with FDA Process Analytical Technology (PAT) goals by enabling at-line monitoring that can reduce laboratory turnaround and improve process control.
The primary objective was to evaluate a transmission-mode NIR assay for determining the content uniformity of tablets containing chlorpheniramine maleate (CPM). The work aimed to replace or supplement traditional HPLC methods and to demonstrate near real-time feedback capabilities.
Spectra were collected using a NIRS XDS MasterLab in transmission mode over 800–1650 nm. Ten tablets per batch (0.25″ diameter, 100 mg weight) with CPM levels from 0 to 2.0 mg were measured in under five minutes. Pre-processing included second derivative transformation, smoothing, and thickness correction. Chemometric calibration employed partial least squares (PLS) regression with six factors selected based on a minimum PRESS criterion.
The PLS model yielded an R2 of 0.9998, a standard error of calibration (SEC) of 0.0119 mg, and a standard error of prediction (SEP) of 0.01 mg. Cross-validation produced an SECV of 0.0148 mg. A clear analytical band at 1138 nm facilitated linear quantification from 0.1 to 2.0 mg CPM. Repeatability tests on 0.1 mg tablets showed an average precision of 0.0039 mg and bias of 0.0018 mg. Statistical process control charts confirmed robust real-time monitoring capabilities.
Further improvements may include calibration models with finer concentration increments around the target, integration of in-line NIR probes for continuous monitoring, and expansion to other active pharmaceutical ingredients. Advances in chemometrics and hardware could further enhance accuracy and robustness.
The application of transmission NIR spectroscopy for tablet content uniformity provides a rapid, accurate, and PAT-compliant alternative to conventional HPLC. This approach can significantly streamline quality control, reduce laboratory workload, and enable real-time process adjustments.
No external literature references were provided.
NIR Spectroscopy
IndustriesPharma & Biopharma
ManufacturerMetrohm
Summary
Significance of the Topic
This study addresses the need for rapid and non-destructive testing of tablet content uniformity. Near-infrared (NIR) spectroscopy aligns with FDA Process Analytical Technology (PAT) goals by enabling at-line monitoring that can reduce laboratory turnaround and improve process control.
Objectives and Overview of the Study
The primary objective was to evaluate a transmission-mode NIR assay for determining the content uniformity of tablets containing chlorpheniramine maleate (CPM). The work aimed to replace or supplement traditional HPLC methods and to demonstrate near real-time feedback capabilities.
Methodology and Instrumentation
Spectra were collected using a NIRS XDS MasterLab in transmission mode over 800–1650 nm. Ten tablets per batch (0.25″ diameter, 100 mg weight) with CPM levels from 0 to 2.0 mg were measured in under five minutes. Pre-processing included second derivative transformation, smoothing, and thickness correction. Chemometric calibration employed partial least squares (PLS) regression with six factors selected based on a minimum PRESS criterion.
Instrumentation
- NIRS XDS MasterLab with multi-tablet transmission tray
- Elizabeth-Hata HT-AP 18 SS-U/I rotary tablet press
Main Results and Discussion
The PLS model yielded an R2 of 0.9998, a standard error of calibration (SEC) of 0.0119 mg, and a standard error of prediction (SEP) of 0.01 mg. Cross-validation produced an SECV of 0.0148 mg. A clear analytical band at 1138 nm facilitated linear quantification from 0.1 to 2.0 mg CPM. Repeatability tests on 0.1 mg tablets showed an average precision of 0.0039 mg and bias of 0.0018 mg. Statistical process control charts confirmed robust real-time monitoring capabilities.
Benefits and Practical Applications
- Reduction of analysis time from hours or days to minutes
- Non-destructive, at-line measurement compatible with PAT
- Minimized use of solvents and elimination of lengthy HPLC preparation
- Immediate feedback for tablet press operators and quality assurance
Future Trends and Opportunities
Further improvements may include calibration models with finer concentration increments around the target, integration of in-line NIR probes for continuous monitoring, and expansion to other active pharmaceutical ingredients. Advances in chemometrics and hardware could further enhance accuracy and robustness.
Conclusion
The application of transmission NIR spectroscopy for tablet content uniformity provides a rapid, accurate, and PAT-compliant alternative to conventional HPLC. This approach can significantly streamline quality control, reduce laboratory workload, and enable real-time process adjustments.
References
No external literature references were provided.
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