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Related Concept Videos

Downstream Processing01:29

Downstream Processing

Downstream processing begins once fermentation is complete and involves a series of steps to recover and purify products such as acids, vitamins, antibiotics, or proteins.Cell HarvestingFor example, for intracellular protein-based products, the first step is harvesting the cells. This is typically achieved using centrifugation or filtration to separate the cells from the liquid phase.Cell Disruption for Intracellular ProductsIf the target product is intracellular, the harvested cells must be...
Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
Bulk or large solid samples are typically reduced in size using grinding, crushing, or milling techniques to increase the...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Sublimation01:03

Sublimation

Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...

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OnePot PURE Cell-Free System
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Preparing a purification summary table.

Richard R Burgess1

  • 1McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Methods in Enzymology
|November 7, 2009
PubMed
Summary
This summary is machine-generated.

Creating effective protein purification summary tables is crucial for reproducibility. This guide details essential characteristics and common pitfalls to improve scientific communication and experimental planning.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Science

Background:

  • Protein purification schemes are fundamental in biochemical and molecular biology research.
  • Published protein purification details are essential for experimental replication and validation.
  • A clear summary of purification steps and protein characteristics aids researchers in evaluating and modifying protocols.

Purpose of the Study:

  • To outline the key features of an effective protein purification summary table.
  • To identify and discuss frequent errors and challenges encountered in existing purification tables.
  • To enhance the clarity and utility of published protein purification data.

Main Methods:

  • Analysis of common protein purification summary tables from scientific literature.
  • Identification of best practices for presenting purification data.
  • Discussion of recurring mistakes and their impact on reproducibility.

Main Results:

  • Effective tables should clearly present major purification steps and corresponding protein features.
  • Common issues include missing data, unclear units, and inadequate characterization.
  • Well-designed tables facilitate the evaluation of purification efficiency and guide protocol modifications.

Conclusions:

  • Improved protein purification summary tables are vital for scientific reproducibility.
  • Adhering to best practices enhances the value of published research.
  • Addressing common table-related problems will aid researchers in repeating and building upon previous work.