Impurity Removal
Impurity Removal - Related Videos
09:14
Glovebox and Impurity Sensors
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University The glovebox provides a straightforward means to handle air- and moisture-sensitive solids and liquids. The glovebox is what it sounds like: a box with gloves attached to one or more sides, which allows the user to perform manipulations within the glovebox under an inert atmosphere. For manipulations under inert atmospheres, chemists can choose between Schlenk or high-vacuum techniques and a glovebox. Schlenk and...
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Cited by 14 •
2015
This paper details the fabrication process of a gate-tunable graphene device, decorated with Coulomb impurities for scanning tunneling microscopy studies. Mapping the spatially dependent electronic structure of graphene in the presence of charged impurities unveils the unique behavior of its relativistic charge carriers in response to a local Coulomb potential.
01:19
Pharmaceutical Alternatives: Excipients and Impurities-Related Therapeutic Nonequivalence
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2025
Pharmaceutical products contain more than just the active drug; they also contain various excipients such as binders, solubilizers, stabilizers, preservatives, and other elements. In some cases, impurities or contaminants might be present. Traditionally, quality control in pharmaceuticals has primarily focused on the analysis of the active drug, often overlooking the impact of these additional components. The recent issue with heparin contamination by over-sulfated chondroitin sulfate, a...
11:23
Purifying the Impure: Sequencing Metagenomes and Metatranscriptomes from Complex Animal-associated Samples
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Cited by 30 •
2014
Using the cystic fibrosis airway as an example, the manuscript presents a comprehensive workflow comprising a combination of metagenomic and metatranscriptomic approaches to characterize the microbial and viral communities in animal-associated samples.
06:43
Rotary Evaporation to Remove Solvent
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2023
Source: Dr. Melanie Pribisko Yen and Grace Tang — California Institute of Technology Rotary evaporation is a technique most commonly used in organic chemistry to remove a solvent from a higher-boiling point compound of interest. The rotary evaporator, or "rotovap", was invented in 1950 by the chemist Lyman C. Craig. The primary use of a rotovap is to dry and purify samples for downstream applications. Its speed and ability to handle large volumes of solvent make rotary evaporation a preferred...
FAQs
Method selection depends on the impurities present, the purity required, and the stability of the target compound. A chemist can match these factors to differences in particle size, solubility, boiling point, polarity, or affinity for a stationary phase. This property-based approach helps avoid conditions that could compromise the desired material or limit downstream use.
Each technique separates components through a different property contrast. Filtration distinguishes particles by size, crystallization uses differences in solubility, and distillation separates substances according to boiling point. Liquid-liquid extraction relies on how compounds distribute between liquids, while chromatography uses polarity or affinity for a stationary phase. The strongest usable contrast generally guides method selection.
A purification method must improve purity without making the target compound unsuitable for use. Stability therefore becomes a selection criterion alongside the impurity profile and desired purity. Conditions chosen without regard to stability may undermine the material being recovered, whereas a compatible method supports reliable analysis, downstream reactions, or consistent product performance.
Begin by considering which impurities are present and which property differences distinguish them from the desired compound. Next, select a compatible technique, such as filtration, crystallization, distillation, liquid-liquid extraction, or chromatography. Finally, judge the method against the required purity and target stability. This workflow links the separation mechanism to the intended outcome.
Chromatography is useful when separation can exploit differences in polarity or affinity for a stationary phase. It may be selected instead of filtration, crystallization, distillation, or liquid-liquid extraction when those methods do not provide the needed separation through particle size, solubility, boiling point, or liquid distribution. Its relevance depends on the mixture and required purity.
In chemistry research, removing unwanted substances supports reliable analysis and protects downstream reactions from interfering components. In industrial settings, purification contributes to consistent pharmaceuticals, chemicals, and materials. The appropriate method can therefore affect both experimental interpretation and product suitability, with the final choice shaped by impurity identity, desired purity, and target-compound stability.