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A multicommutation-based flow system for multi-element analysis in pharmaceutical preparations.

F R Rocha¹, P B Martelli, B F Reis

¹Departamento de Quimica, Universidade Federal de São Carlos, São Carlos, SP, Brazil.

|October 31, 2008

Summary

This summary is machine-generated.

This study introduces a novel flow system for simultaneously determining multiple elements in pharmaceuticals. The method offers high efficiency and low reagent consumption, validated against established techniques.

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Area of Science:

Analytical Chemistry
Pharmaceutical Analysis
Spectrophotometry

Background:

Accurate elemental analysis is crucial for pharmaceutical quality control.
Existing methods for multi-element determination can be time-consuming and reagent-intensive.
Development of efficient and cost-effective analytical systems is needed.

Purpose of the Study:

To develop and validate a multicommutation and multidetection flow system for sequential elemental analysis in pharmaceutical preparations.
To assess the system's feasibility for determining zinc, iron, copper, calcium, and magnesium.
To evaluate the system's efficiency, precision, and reagent consumption compared to conventional methods.

Main Methods:

A gravity-flow system utilizing multicommutation and multidetection was designed.
Chromogenic reagents and sample aliquots were added sequentially without a propulsion unit.
Transient spectrophotometric signals were measured simultaneously using a fiber-optic multichannel spectrophotometer.
Elemental analysis was performed on pharmaceutical preparations.

Main Results:

The system successfully determined zinc, iron, copper, calcium, and magnesium with coefficients of variation ranging from 1.0% to 2.5%.
A mean sampling rate of 60 determinations per hour was achieved for the five elements.
Reagent consumption was up to 160-fold lower than continuous reagent addition systems.
Results obtained for pharmaceutical preparations showed excellent agreement with Flame Atomic Absorption Spectrophotometry (FAAS) at the 95% confidence level.

Conclusions:

The proposed flow system provides a sensitive, precise, and efficient method for multi-element analysis in pharmaceuticals.
The system's design minimizes reagent usage and analysis time, making it a cost-effective alternative.
This approach demonstrates significant potential for routine quality control in the pharmaceutical industry.