Table of Contents
What is DEAE-dextran mediated transfection?
DEAE-Dextran Transfection Diethylaminoethyl (DEAE)-dextran is a polycationic derivative of the carbohydrate polymer dextran, and it is one of the first chemical reagents used to transfer nucleic acids into cultured mammalian cells (Vaheri and Pagano, 1965).
How does DEAE-dextran work?
The cationic DEAE‑dextran molecule tightly associates with the negatively charged backbone of the nucleic acid, and the net positive charge of the resulting nucleic acid-DEAE‑dextran complex allows it to adhere to the cell membrane and enter into the cytoplasm via endocytosis or osmotic shock induced by DMSO or …
How do you make DEAE-dextran?
DEAE-dextran Preparation and Recipe
- Prepare 800 mL of distilled water in a suitable container.
- Add 50 g of DEAE-dextran to the solution.
- Add distilled water until the volume is 1 L.
- Sterilize the solution by autoclaving for 20 minutes at 15 psi (1.05 kg/cm2) on liquid cycle.
How does transfection reagent work?
Transfection reagents, such as Transfectamine™ 5000, are positively charged and attract the negatively charged DNA to form a positively charged polymer, which can interact with negatively charged cell membrane which enables the uptake of this polymer into the cell.
How does calcium phosphate transfection work?
The calcium phosphate transfection method for introducing DNA into mammalian cells is based on forming a calcium phosphate-DNA precipitate. Calcium phosphate facilitates the binding of the DNA to the cell surface. DNA then enters the cell by endocytosis.
How does DEAE chromatography work?
DEAE-Sephadex is a positively-charged slurry that will have electrostatic interactions with the negatively charged atoms, making them elute later than the positively-charged molecules in the interested sample. This is a separation technique used widely to discover specific proteins, or enzymes in the body.
What is DEAE ion exchange chromatography?
Ion-exchange chromatography DEAE-C is a weak anion exchanger. This exchange is utilized to separate proteins that have faintly differing charges. Like all anion exchangers, the resin carries a positive charge that interacts favorably with negative charges.
How do you make dextran?
Dextran is produced at the industrial level by the fermentation of sucrose-rich media. Several research workers have optimized fermentation conditions for maximum dextran production.
How can I increase my transfection efficiency?
Improving the Success of Your Transfection
- Transfect healthy, actively dividing cells at a consistent cell density.
- Transfect using high-quality DNA.
- Optimize the amount of DNA used to transfect cells.
- Optimize the transfection reagent:DNA ratio.
- Optimize cell number per well when transfected.
What is the difference between transformation and transfection?
The main difference between transfection and transformation is that the transfection refers to the introduction of foreign DNA into mammalian cells while the transformation refers to the introduction of foreign DNA into bacterial, yeast or plant cells.
What is the difference between transformation transduction and transfection?
Transformation and transduction (as well as conjugation) are types of horizontal gene transfer—the transmission of genetic material between organisms—that occur naturally, whereas transfection occurs only by artificial means and is carried out in a lab.
What is cacl2 transfection?
The procedure is routinely used to transfect a wide variety of cell types for transient expression or for producing stable transformants. The DNA is mixed directly with a concentrated solution of CaCl2, which is then added dropwise to a phosphate buffer to form a fine precipitate.
How does DEAE cellulose work?
DEAE cellulose is an anionic resin which can be used to bind -vely charged proteins. Proteins can be eluted by altering either by increasing the salt concentration or by altering the pH. DEAE is a weak ion exchange resin, which means the pH range at which it can be used is limited, charge density will vary.
Is DEAE a cation exchanger?
At neutral pH the carboxymethyl group is ionized as -CH2OCH2COO¯ so that CM- cellulose is negatively charged, so it is a weak cation exchanger. DEAE-cellulose contains an diethylaminoethyl group. It is positively charged at neutral pH and so DEAE-cellulose is a weak anion exchanger.
What is DEAE Sepharose chromatography?
3 days ago
Overview. DEAE Sepharose Fast Flow is a weak anion exchange chromatography resin (medium) for fast protein purification. Well-proven weak anion exchanger developed for industrial downstream processes. Used extensively for capture and intermediate purification of a wide range of approved biopharmaceuticals.
How do you dissolve dextran?
Dextran fractions are freely soluble in water. To hasten dissolution of dextran powders, the powder should be added portion wise to warm (hot) water with vigorous stirring to avoid lump formation.