alexa Sequential Injection Analysis: A useful Analytical Tool in Drug Dissolution Testing | OMICS International
ISSN : 2153-2435

Pharmaceutica Analytica Acta
Open Access

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Editorial

Sequential Injection Analysis: A useful Analytical Tool in Drug Dissolution Testing

Paraskevas D. Tzanavaras*

Laboratory of Analytical Chemistry, Department of Chemistry, Aristotelian University of Thessaloniki, GR-54124 Thessaloniki, Greece

*Corresponding Author:
Paraskevas D. Tzanavaras
Laboratory of Analytical Chemistry
Department of Chemistry, Aristotelian University of Thessaloniki
GR- 54124 Thessaloniki, Greece
Tel: 0030 2310997721
E-mail: [email protected]

Received Date: July 07, 2012; Accepted Date: July 09, 2012; Published Date: July 13, 2012

Citation: Tzanavaras PD (2012) Sequential Injection Analysis: A useful Analytical Tool in Drug Dissolution Testing. Pharmaceut Anal Acta 3:e114.doi: 10.4172/2153-2435.1000e114

Copyright: © 2012 Tzanavaras PD. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Sequential-injection analysis (SI) is considered to be the second generation of flow injection techniques and was initially developed by Ruzicka and Marshall [1,2] as an alternative sample-handling technique to the well-established Flow injection analysis (FI) [3-5]. As can be seen in a typical SI setup in Figure 1, the heart of a SI manifold is a multiposition selection valve. Fluids are manipulated within the manifold by means of a bi-directional pump. A holding coil is placed between the pump and the common port of the multiposition selection valve. The selection ports of the valve are reservoirs, detectors, pumps, reactors, separators, special cells, other manifolds etc. After aspiration of a discrete volume (zone) of sample into the holding coil via the sample line, the sample can be subjected to very complex physical and chemical pre-treatment in different ways within the SI manifold. SI offers great potential for sample handling because it is a bidirectional, stopped-flow sample-handling technique enabling the sample to be serially processed in the different modules connected to the selection valve by means of repetitive aspiration and delivery steps. The advantages of SI over FI are the following: a) SI makes use of a simpler manifold that can be employed for a larger range of analytical methods without (or minimal) alterations in its physical configuration; b) in SI, discrete volumes of sample and reagents are aspirated and their consumption is drastically reduced; c) the bidirectional and stopped-flow operation of SI provides great scope for pre-treatment of the sample. This last attribute of SI makes it ideally suited to clinical and biochemical applications for which sample pre-treatment is usually necessary prior to the actual analytical measurement.

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