Isopropyl Alcohol Precipitation
Isopropyl Alcohol Precipitation - Related Videos
01:17
Precipitation and Co-precipitation
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2024
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
03:11
Precipitation of Ions
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2020
Predicting Precipitation The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is: It is important to realize that this equilibrium is established in any aqueous solution containing Ca2+ and CO32– ions, not just in a solution formed by saturating water with calcium carbonate. Consider, for example, mixing aqueous solutions of the soluble compounds sodium carbonate and calcium nitrate. If the concentrations of calcium and carbonate ions in the mixture...
08:02
Separation of Mixtures via Precipitation
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2023
Source: Laboratory of Dr. Ana J. García-Sáez — University of Tübingen Most samples of interest are mixtures of many different components. Sample preparation, a key step in the analytical process, removes interferences that may affect the analysis. As such, developing separation techniques is an important endeavor not just in academia, but also in industry. One way to separate mixtures is to use their solubility properties. In this short paper, we will deal with aqueous solutions. The...
03:10
Precipitation Reactions
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2020
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
09:09
Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Cited by 3 •
2016
We present a protocol to synthesize Janus microhydrogels composed entirely of the same base material, poly(N-isopropylacrylamide) (PNIPAAm), with a clearly compartmentalized structure base on the phase separation of a supersaturated NIPAAm monomer solution. The synthesized Janus microhydrogels show unique properties such as anisotropic thermo-responsiveness and organophilic/hydrophilic loading capability.
FAQs
Salt is essential because sodium acetate or ammonium acetate supports nucleic-acid aggregation when isopropanol reduces the water available in solution. The chosen salt helps shift DNA or RNA out of the aqueous phase rather than merely concentrating the sample. This step is particularly relevant when starting material is dilute and needs recovery for downstream analysis.
Low temperature is used as a condition that accompanies salt addition and isopropanol treatment, rather than as a substitute for either component. Under these conditions, nucleic acids aggregate sufficiently to become visible as a pellet after centrifugation. Maintaining the intended temperature can support recovery from dilute preparations, where small amounts of DNA or RNA may be difficult to collect.
Centrifugation separates aggregated nucleic acids from the liquid phase so the material can be retained as a pellet. An ethanol wash then helps remove residual salts before the pellet is redissolved in a suitable buffer. These operations affect sample usability because incomplete separation or washing can leave recovered DNA or RNA less suitable for later molecular biology analyses.
A basic workflow begins with an aqueous DNA or RNA sample, followed by salt and isopropanol addition, often with cooling. Centrifugation collects the nucleic-acid pellet, and ethanol washing removes excess salts. After the pellet is redissolved in a suitable buffer, the preparation can proceed to PCR, sequencing, cloning, or another molecular biology analysis.
Researchers may choose this approach when a nucleic-acid preparation is too dilute for convenient downstream use or contains excess salts that need removal. Its outcome is a more concentrated, cleaner preparation rather than a new form of nucleic acid. The recovered material can support PCR, sequencing, cloning, and other analyses requiring DNA or RNA as input.
The method fits biology workflows because it is inexpensive and adaptable to both small and large samples. That flexibility makes it useful across molecular biology preparations rather than limiting it to one assay or sample scale. Its value is greatest when researchers need to recover nucleic acids economically and then transfer them into a suitable buffer for subsequent analysis.