Column: Practical Data Handling - Chromatography Online
Column: Practical Data Handling

Variable Selection and Reduction in Multivariate Calibration and Modelling

December 1, 2011

In multivariate calibration and modelling a model is built between a large data matrix containing many variables for each sample and the property of the sample.

Common Problems with Method Optimization in Pharmaceutical Analysis

August 1, 2011

The various steps of an experimental design-based approach are considered and the problems that arise from wrong choices are described.

Method Development for Drug Impurity Profiling (Part 2)

November 1, 2010

A systematic approach to developing drug impurity profiling methods.

Method Development for Drug Impurity Profiling

April 1, 2010

In this Practical Data Handling column, method development for drug impurity profiling is discussed.

Response Surface Designs (Part 2)

December 1, 2009

Part two of the column on response surface designs looks at data analysis and various approaches to simultaneously optimize multiple responses

Response Surface Designs Part 1 — Types and Properties

May 1, 2009

Experimental designs are used in method development and robustness testing and have been discussed in an earlier article.1 An experimental design is an experimental set-up that allows the simultaneous examination of a predefined number of factors in a predefined number of experiments. Method development is often divided into a screening and an optimization step. During the first step, many factors, potentially affecting the method, are screened to determine the most important factors, which are then further optimized.1

The Limit of Detection

February 1, 2009

The concept of the limit of detection (LOD) has been, and still is, one of the most controversial in analytical chemistry. The multiple definitions and calculation methods proposed have contributed to this situation. Although in the last years, several international organizations, such as ISO or IUPAC, have tried to reach a consensus in their definitions and have issued guidelines for the estimation of this important parameter in chemical analysis, the subject is still a matter of scientific debate. In this article, we try to clarify the definition and provide guidelines to estimate LOD in chromatographic methods of analysis.

Estimating Uncertainty

December 1, 2008

Estimating uncertainty has become one of the most important metrological concepts in analytical science over the last 15 years to such an extent that some authors consider a result useless or invalid unless it is accompanied with an uncertainty statement. This article describes how to estimate uncertainty in chromatographic analysis and how laboratories can calculate it using data from the method validation process.

Extracting Information from Chromatographic Herbal Fingerprints

September 1, 2008

Herbs and their extracts are currently being used for preventive and therapeutic goals. Consequently, the identification and quality control of these natural products is becoming increasingly important. Fingerprint chromatography is accepted as an appropriate identification and quality evaluation technique for medicinal herbs. This article reviews the development procedure of a fingerprint and different ways to handle the fingerprint data.


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