Simultaneous determination of codeine and noscapine by flow-injection chemiluminescence method using N-PLS regression

Area of Science:

• Analytical Chemistry
• Chemiluminescence Spectroscopy
• Pharmaceutical Analysis

Background:

• Simultaneous determination of codeine and noscapine is crucial for pharmaceutical quality control.
• Existing methods may lack the sensitivity or specificity required for complex matrices.
• Chemiluminescence (CL) offers a sensitive detection pathway for pharmaceutical compounds.

Purpose of the Study:

• To develop a novel flow injection chemiluminescent (FI-CL) method for simultaneous codeine and noscapine quantification.
• To optimize reaction conditions using experimental design for enhanced sensitivity and selectivity.
• To validate the method for application in pharmaceutical preparations.

Main Methods:

• Development of a flow injection system utilizing the Ru(phen)(3)(2+)-Ce(IV) chemiluminescent reaction.
• Exploitation of distinct kinetic profiles (peak times) of codeine and noscapine.
• Optimization of key variables (Ru(II), Ce(IV) concentrations, H2SO4) using Central Composite Design (CCD).
• Application of N-way Partial Least Squares (N-PLS) regression for simultaneous quantification based on a three-way data structure (samples, H2SO4 concentration, time).

Main Results:

• The FI-CL method successfully differentiated codeine (peak at 4.4s) and noscapine (peak at 2.6s) based on their kinetic characteristics.
• Optimized conditions using CCD improved the method's performance.
• N-PLS regression effectively handled the multi-dimensional data for accurate simultaneous quantification.
• The method demonstrated applicability for analyzing codeine and noscapine in pharmaceutical formulations.

Conclusions:

• A robust and sensitive FI-CL method for simultaneous codeine and noscapine determination has been established.
• The combination of kinetic discrimination and N-PLS regression provides a powerful tool for complex mixture analysis.
• This method offers a viable approach for quality control of pharmaceutical products containing these alkaloids.