Crude Extract Preparation
Crude Extract Preparation - Related Videos
03:58
Preparation of Crude Cell Extract from Vibrio natriegens
0 Views •
2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the preparation of a cell extract from Vibrio natriegens, a rapidly growing bacterium known for its high protein synthesis rate. The bacterial pellet is washed and resuspended in lysis buffer before sonication on ice to prevent cellular degradation. The lysate is centrifuged to separate insoluble cell debris, and the cell extract is...
03:32
Cell-Free Protein Expression Using a Bacterial Crude Cell Extract
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the use of a bacterial cell-free protein expression system based on Vibrio natriegens crude lysate to perform coupled in vitro transcription and translation. It highlights the preparation of a master mix with essential components and the step-by-step synthesis of functional proteins from a DNA template.
07:45
Preparation and Fractionation of Xenopus laevis Egg Extracts
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Cited by 7 •
2008
Crude and fractionated Xenopus egg extracts can be used to provide ingredients for reconstituting cellular processes for morphological and biochemical analysis. Egg lysis and differential centrifugation are used to prepare the crude extract which in turn in used to prepare fractionated extracts and light membrane preparations.
03:16
Phospholipase Activity Assay: A Gel Diffusion Assay to Determine Phospholipase Activity in Crude Venom Extract from Anthopleura dowii
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2025
In this video, we demonstrate an assay to establish the presence of phospholipase in the crude venom extract from Anthopleura dowii—a marine sea anemone. The assay utilizes an agarose gel diffusion technique, in which the enzyme phospholipase diffuses and breaks down phospholipids incorporated in the solid media in a radial manner.
08:56
Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
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2018
Here we present a new approach to identify plant viruses with double-strand DNA genomes. We use standard methods to extract DNA and RNA from infected leaves and carry out next-generation sequencing. Bioinformatic tools assemble sequences into contigs, identify contigs representing virus genomes and assign genomes to taxonomic groups.
FAQs
A suitable buffer provides the liquid environment in which disrupted biological material is processed and soluble constituents remain available for recovery. Its role is therefore tied to the target fraction: proteins, nucleic acids, metabolites, and other soluble molecules are retained, whereas the preparation later removes intact cells and insoluble debris. This makes the buffer an important part of extract accessibility.
These are alternative ways to disrupt cells, tissues, or microorganisms before the soluble material is separated from debris. Grinding and homogenization use physical processing, sonication applies sound energy, and chemical lysis uses chemical treatment. Although their disruption mechanisms differ, each method serves the same immediate purpose: opening biological material so its soluble constituents can enter the extract.
Centrifugation and filtration perform the clarification step after disruption. They remove intact cells and insoluble debris while allowing soluble molecules to remain in the recovered fraction. This separation matters because it produces material that can be used for enzyme assays, protein or metabolite analysis, and screening, even though the resulting extract still contains many different biological components.
Crude extract preparation provides a practical starting material when researchers need access to many soluble cellular constituents at once. The resulting mixture can support enzyme activity assays, biochemical screening, and preliminary analysis of proteins or metabolites without requiring immediate isolation of a single component. Further purification remains necessary when the goal is precise molecular analysis.
A typical workflow begins with cells, tissue, or microorganisms suspended in a suitable buffer. The sample is then disrupted by grinding, homogenization, sonication, or chemical lysis. Centrifugation or filtration follows to remove intact cells and insoluble debris. The recovered soluble fraction becomes the working material for downstream assays or preliminary characterization.
Crude extracts support enzyme activity assays, protein analysis, metabolite analysis, and biochemical screening. These applications allow researchers to examine soluble biological activity or detect molecular constituents in a complex sample. Because the mixture is not fully purified, the results are most useful for screening and preliminary characterization, while detailed molecular assignments may require additional purification.