Introduction to Chromophores Chromophores are fundamental chemical groups responsible for the absorption of light in the ultraviolet (UV) and visible regions of the electromagnetic spectrum. They play a crucial role in determining the color of compounds and are extensively studied in UV-Visible spectroscopy, medicinal chemistry, photochemistry, and dye chemistry. The term “chromophore” is derived from…
Electronic transitions are the movements of electrons between energy levels (orbitals) in a molecule or atom when they absorb or emit energy, such as photons of light. These transitions form the basis of techniques like UV-visible spectroscopy and are critical in understanding the optical and electronic properties of materials. Types of Electronic Transitions Electronic transitions…
UV-Visible Spectroscopy (UV-Vis Spectroscopy) is one of the most widely used analytical techniques in chemistry, biochemistry, pharmaceutical sciences, environmental science, and materials research. It measures the absorption or reflectance of ultraviolet and visible light in the wavelength range of 200–800 nm by atoms, ions, or molecules. The technique is highly valuable for both qualitative identification…
Introduction: Electrophoresis is a powerful analytical technique used to separate charged molecules, such as proteins, DNA, and RNA, based on their size, shape, and charge under the influence of an electric field. When an electric current is applied to a solution containing charged particles, these molecules move toward the electrode with the opposite charge. It…
Introduction Paper chromatography is a simple and effective analytical technique used to separate and identify mixtures of substances. This method is classified under partition chromatography, where separation occurs based on the differential partitioning of solutes between a mobile phase (solvent) and a stationary phase (paper). It was first introduced in the early 20th century and…
Thin Layer Chromatography (TLC) is a widely used analytical technique that separates and identifies compounds in a mixture. It is based on the differences in the migration rate of compounds when carried by a mobile phase (solvent) over a stationary phase (adsorbent layer). Thin Layer Chromatography (TLC) is a type of planar chromatography. It is…
Partition column chromatography is a type of liquid-liquid chromatography where separation is based on the partitioning of components between two immiscible liquid phases—one as the stationary phase and the other as the mobile phase. This technique is commonly used for separating mixtures of compounds with varying solubilities and plays an important role in pharmaceutical, biochemical,…
Adsorption chromatography is a separation technique based on the differential adsorption of compounds onto a solid stationary phase. It is widely used to purify and separate chemical compounds based on their interaction with the adsorbent material. The process relies on the principle that different molecules have varying degrees of affinity to the surface of a…
Introduction Ion Exchange Chromatography (IEC) is a powerful and versatile separation technique primarily used to purify proteins, peptides, amino acids, and other charged biomolecules based on their ionic charge. It separates molecules by their affinity to charged ion-exchange resins in the stationary phase. This technique is widely used in the pharmaceutical industry, biochemical research, water…
Gel chromatography, also known as size-exclusion chromatography (SEC), is a separation technique used primarily for separating molecules based on their size. It is widely used for purifying proteins, polysaccharides, and other macromolecules. In this technique, molecules are separated as they pass through a column filled with porous gel beads, and larger molecules elute (exit) from…
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