Desorption Solvent Preparation
Desorption Solvent Preparation - Related Videos
08:13
Preparation of Biopolymer Aerogels Using Green Solvents
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Cited by 44 •
2016
A new way for the production of biopolymer-based aerogels by carbon dioxide (CO2) induced gelation is shown. The technique utilizes pressurized carbon dioxide (5 MPa) for the production of biopolymer hydrogels and supercritical CO2 (12 MPa) to convert gels into aerogels. The only solvents needed besides CO2 are water and ethanol.
01:12
Solvents
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2019
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute. A...
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...
09:41
Schlenk Lines Transfer of Solvents
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2023
Source: Hsin-Chun Chiu and Tyler J. Morin, laboratory of Dr. Ian Tonks—University of Minnesota Twin Cities Schlenk lines and high vacuum lines are both used to exclude moisture and oxygen from reactions by running reactions under a slight overpressure of inert gas (usually N2 or Ar) or under vacuum. Vacuum transfer has been developed as a method separate solvents (other volatile reagents) from drying agents (or other nonvolatile agents) and dispense them to reaction or storage vessels while...
01:16
Titration in Nonaqueous Solvents
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2024
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
FAQs
Solvent strength and polarity determine how effectively the formulation weakens interactions between an analyte and the material retaining it. A suitable balance can promote release without compromising the chemical stability of the target compounds. Because analytes and collection materials differ in their interactions, adjusting these properties is central to improving recovery and limiting unwanted matrix effects.
pH can change the chemical environment surrounding retained compounds and influence how strongly they interact with the sorbent or collection surface. During formulation, pH therefore must be selected alongside solvent strength and polarity rather than treated as an isolated variable. Appropriate conditions support analyte release while helping preserve compound stability for subsequent analysis.
Additives can modify the solvent environment to help weaken analyte-sorbent interactions or maintain the stability of compounds during release. Their use must remain compatible with the intended analytical workflow, because the formulation should improve recovery without increasing matrix interference. This balance is especially important when the extracted material will undergo chromatographic or mass spectrometric analysis.
Begin by identifying the compounds of interest, the material retaining them, and the downstream analytical method. Then select and balance solvent strength, polarity, pH, and any suitable additives with the goals of releasing the analytes, preserving their stability, and reducing matrix interference. The resulting formulation should be evaluated by its recovery and reliability in the complete sample-preparation workflow.
In medical research and testing, the approach supports extraction workflows for biological specimens, pharmaceutical products, and therapeutic drug monitoring. It is relevant whenever compounds must be released from a sorbent, surface, or other collection material before measurement. Proper formulation helps prepare samples that are more suitable for chromatographic or mass spectrometric determination.
A well-matched formulation can increase the amount of target compound recovered from the collection material and reduce substances that interfere with measurement. These effects can improve the reliability of chromatographic and mass spectrometric results. Conversely, an unsuitable balance of solvent properties may limit release or compromise compound stability, making optimization important for dependable interpretation.