A Clear Introduction to Chromatography: An Essential Technique for BTS Students
Chromatography is an analytical method that separates, identifies, and quantifies the components of a mixture. Used in many sectors, from biotechnology to pharmacology, it has become a basic tool for BTS students. In 2025, this technique is evolving thanks to the integration of sophisticated technologies offered by manufacturers such as Agilent, Thermo Fisher Scientific, and Waters. When we talk about chromatography, we often think of a simple experiment, but in reality, it’s a complex process based on the different affinities of each substance for two distinct phases: the stationary phase and the mobile phase. To understand all this, we must first understand the fundamental principle: each component of a mixture migrates at a different speed depending on its chemical nature and interactions, thus allowing them to be efficiently separated.
To answer this essential question, what are the main chromatographic techniques? They can be classified into several broad groups: paper chromatography, thin-layer chromatography (TLC), gas chromatography (GC), and liquid chromatography (LC). Each method has its own specificities, advantages, and limitations, which are explained in this practical sheet for future laboratory technicians. The key to success often lies in the choice of technique, depending on the type of sample and the required precision. Don’t hesitate to attend all our study days to delve deeper into every aspect of this fascinating discipline. They offer an essential practical approach, helping you master reading results and handling modern instruments such as those from Shimadzu or Dionex, renowned for their precision. Moreover, modern equipment allows for even faster, more sensitive, and more reproducible analyses, which is a major advantage for quality control or regulatory analyses.Discover chromatography, an essential technique in chemistry for separating and analyzing the components of a mixture. Learn the different types of chromatography, their applications in various sectors, and the scientific principles that govern them.
The Fundamentals of How Chromatography Works: Stationary and Mobile Phases
Here are some examples to better visualize these concepts:
The stationary phase can be hexagonal or polar, depending on whether the aim is to isolate nonpolar or polar molecules.
The mobile phase can be based on water, acetone, or other solvents, adjusted to optimize the separation.
Flow rates and temperature are also essential parameters in the overall operation.
- Experienced researchers and technicians know that mastering these phases and parameters plays a decisive role in the quality of analytical results. Column design and phase selection therefore allow the technique to be adapted to any type of sample, from the simplest to the most complex.
- Discover the fascinating world of chromatography, an essential analytical technique used to separate and analyze chemical compounds. Learn its applications in various fields such as chemistry, biology, and the pharmaceutical industry.
- Different Chromatographic Techniques: From Paper to Integrated Spectrometer
There are a variety of chromatographic techniques, each adapted to a specific context. Some, such as paper or thin-layer chromatography, are simple and inexpensive, ideal for teaching or quality control. Others, such as high-performance gas or liquid chromatography (HPLC), are more sophisticated and used for complex analyses.
Manufacturers such as Shimadzu, Waters, and Bio-Rad offer high-performance devices with ultra-quantification modules or advanced detection sensors. These systems also allow the integration of a range of automated tools to simplify laboratory work. Technique
Support Used
Main Application
Advantages
| Paper Chromatography | Cellulose Paper | Simple Qualitative Analysis | Easy, Inexpensive |
|---|---|---|---|
| Thin Layer Chromatography (TLC) | Aluminized Foil Coated with Stationary Phase | Compound Identification, Rapid Control | Simple, Rapid, Minimal Equipment Required |
| Gas Chromatography (GC) | Capillary Column | Volatile Compound Analysis | High Sensitivity, Excellent Separation |
| High Performance Liquid Chromatography (HPLC) | Silica or Polymer Column | Complex Analysis, Accurate Quantification | Fast, Highly Sensitive, Automatable |
| Technological Advances in Chromatography in 2025 | Recent innovations are giving this discipline a new lease of life, making life easier for future technicians. The integration of advanced detectors allows for extremely precise measurements, even for minute traces. Automated systems, available from Agilent or Horiba, simplify operations while ensuring optimal reproducibility. The miniaturization of devices also allows for portable analyses, which is practical for in situ testing, in mobile laboratories, or in the field. | Modern devices often integrate connectivity with management and analysis software, allowing for the rapid generation of accurate reports. Their compatibility with a variety of samples opens up new perspectives, particularly in biotechnology and environmental applications. The rise of combined techniques, such as chromatography coupled with mass spectrometry (LC-MS/MS), finally offers highly selective identification possibilities in complex matrices. https://www.youtube.com/watch?v=ZwKlbaMKJ0U | Concrete Applications of Chromatography in Industry and Academia |
The examples of chromatography’s use are numerous and diverse. Whether it’s quality control in the pharmaceutical industry, verifying food purity, or even environmental research, this technique is everywhere. The benchmarks in this field are companies like Sartorius and Dionex, which provide solutions adapted to the regulatory requirements of 2025.
In the pharmaceutical sector, chromatography is used to identify each component of a drug to verify its compliance. For example, during quality control, the purity of an active ingredient or the stability of a finished product is analyzed. In biotechnology, the separation of proteins or DNA is a crucial step in research. Modern techniques also allow for the precise quantification of low concentrations of substances, essential for the development of new drugs.
In the agri-food sector, chromatography is used to detect contaminants, such as the presence of pesticides or undeclared allergens, while helping to ensure product traceability. Research institutes, such as those affiliated with INRA or INERIS, use these methods to study pollution or contamination in water, air, or soil. Chromatography thus constitutes a truly essential toolbox, providing reliable results in a limited time. Here are some examples of concrete applications:
Detection of pesticide residues in fruits and vegetables
Water analysis to detect the presence of toxic components
Biotechnology studies to isolate proteins or enzymes
Application
Example
- Technologies Used
- Main Objectives
- Pharmaceutical Control
- Analysis of Active Ingredients
| UHPLC, LC-MS/MS | Ensuring Purity and Compliance | Food Analysis | Pesticide Detection |
|---|---|---|---|
| LC, GC | Guaranteeing Consumer Safety | Environmental Research | Water Pollution |
| Chromatography Coupled with Spectrometry | Studying Contamination and Its Sources | Major Challenges for Chromatography in 2025 | Research and industry agree on one point: the need to optimize the speed, sensitivity, and accuracy of analyses. The rise of connected devices enables real-time management, facilitating decision-making. The standardization of protocols through international standards guarantees reliable reproduction of results. Furthermore, the development of hybrid techniques, combining chromatography and mass spectrometry, opens up unprecedented opportunities. The challenges are also financial: costs must be reduced, equipment durability improved, and environmental impact minimized. |
| The emergence of portable solutions, inspired by the Internet of Things, makes it possible to perform analyses directly in the field, in areas without laboratory facilities. These solutions are invaluable for monitoring air quality in industrial areas or for environmental monitoring in certain isolated regions. All this shows that chromatography will continue to play a strategic role in the technological revolution underway in 2025. | To learn more about these innovations, visit our page dedicated to the evolution of chromatographic techniques. | https://www.youtube.com/watch?v=q4k_uRJfDJQ | Frequently asked questions about chromatography explained for BTS students |
What is the difference between gas chromatography and liquid chromatography?
The former uses a gas as the mobile phase, suitable for separating volatile compounds, while the latter uses a liquid, ideal for more complex or temperature-sensitive molecules.
How do I choose the right technique for my sample?
You need to consider the type of sample, the desired sensitivity, the complexity of the matrix, and the available equipment. The study days are an opportunity to experiment with these choices. What equipment is recommended for a BTS laboratory?Brands such as Agilent, Thermo Fisher Scientific, and Waters are very common, but it’s also essential to understand the specific features of each model to optimize your performance.
It’s essential because a well-chosen stationary phase ensures clear separation, thus avoiding interpretation errors.
- How can you master the technical aspects for regulatory controls? By practicing regularly, particularly during study days, and by using modern equipment such as those from Dionex or Horiba, which ensure compliance with the standards in force in 2025.