Ethanol Wash
Ethanol Wash - Related Videos
10:11
Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography
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Cited by 13 •
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A method to determine the time course of ethanol concentration in the brains of rats during operant ethanol self-administration is described. Gas chromatography with flame ionization detection is used to quantify ethanol in the dialysate samples, because it has the sensitivity required for the small volumes that are generated.
00:52
Washing, Drying, and Ignition of Precipitates
0 Views •
2024
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
07:34
Biofuels: Producing Ethanol from Cellulosic Material
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University In this experiment, cellulosic material (such as corn stalks, leaves, grasses, etc.) will be used as a feedstock for the production of ethanol. The cellulosic material is first pretreated (ground and heated), digested with enzymes, and then fermented with yeast. Ethanol production is monitored using an ethanol probe. The experiment can be extended to optimize ethanol production by varying the feedstock used,...
11:15
A Simple Way to Measure Ethanol Sensitivity in Flies
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A simple assay to measure the sedating effects of ethanol on Drosophila flies, based on the loss of righting reflex, is described.
06:46
Pulsed Laser Diode-Based Desktop Photoacoustic Tomography for Monitoring Wash-In and Wash-Out of Dye in Rat Cortical Vasculature
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Cited by 9 •
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A compact pulsed laser diode-based desktop photoacoustic tomography (PLD-PAT) system is demonstrated for high-speed dynamic in vivo imaging of small animal cortical vasculature.
FAQs
A chilled 70% ethanol rinse removes soluble salts, residual solvents, and other contaminants while the precipitated DNA or RNA remains insoluble. This allows the pellet to be washed without losing the main nucleic acid fraction. The resulting reduction in carryover improves the reliability of restriction digestion, PCR, sequencing, and spectrophotometric measurements.
Centrifugation separates the insoluble nucleic acid from the ethanol wash and dissolved contaminants. The nucleic acid collects as a pellet, while the wash liquid can be removed afterward. This separation is essential because purification depends not only on rinsing the sample, but also on retaining the pellet and discarding the solution that contains unwanted soluble material.
Brief air-drying removes excess ethanol that could otherwise remain in the sample and inhibit downstream enzymatic reactions. However, excessive drying can make the nucleic acid pellet difficult to dissolve during resuspension. The drying step therefore requires balance: enough to reduce ethanol carryover, but not so much that recovery in water or buffer becomes difficult.
The procedure consists of rinsing the nucleic acid pellet with chilled 70% ethanol, centrifuging to collect the pellet, removing the wash liquid, and briefly air-drying the remaining material. The dried pellet is then resuspended in water or buffer. Careful handling during liquid removal helps preserve the pellet for downstream analysis.
By reducing residual salts, solvents, and other soluble contaminants, the wash helps prevent carryover from disrupting later measurements or reactions. This is particularly relevant for restriction digestion, PCR, sequencing, and spectrophotometric analysis. In contrast, residual ethanol can inhibit enzymatic reactions, so incomplete removal may compromise performance even when the nucleic acid pellet is recovered.
An ethanol wash is useful after nucleic acid precipitation, when DNA or RNA has formed an insoluble pellet but soluble contaminants remain associated with it. The step provides a practical purification stage before resuspension and further testing. Its value is greatest when downstream workflows depend on clean material and accurate enzymatic or spectrophotometric measurements.