Modulo di contatto

Strategie e metodi di base per la de-endotossina durante la purificazione del DNA plasmidico

lipopolisaccaride, LPS

The use of endotoxin-free plasmids should be considered when the extracted plasmid DNA is used for transfection of primary, sospensione, o cellule sensibili, studi sul silenziamento genico, micromanipolazione per iniezione cellulare, gene therapy or DNA vaccines,and other extremely demanding experiments.

Plasmid de-endotoxinization refers to the step of removing endotoxin (lipopolisaccaride, LPS) during the purification of plasmid DNA. Endotoxin is a lipopolysaccharide and protein complex in the cell wall of Gram-negative bacteria that is released when the bacteria lyse. The presence of endotoxin greatly affects the transfection efficiency and may activate non-specific reactions of immune cells, resulting in false positives in the experiment. Perciò, in order to ensure a high transfection rate and high survival of transfected cells, endotoxin must be removed from the process of plasmid preparation.

The importance of endotoxin removal is:

1.Affect the transfection efficiency: endotoxin will reduce the transfection efficiency of primary cells and sensitive cultured cells, and interfere with the in vitro transfection of immune cells.

2.Activate immune response: endotoxin can also lead to fever, hypotension, respiratory distress, intravascular coagulation, and endotoxic shock syndrome, endotoxin can stimulate the synthesis of inflammatory factors IL-1, IL-6, IL-10, and TNF-α by activating TLR4.

3,.Drug regulatory requirements: The State Drug Administration stipulates that the content of endotoxin in DNA vaccine products should not be higher than 0.01 EU/μg, and the dose for personal use should not exceed 20 EU.

There are two strategies for endotoxin removal:

1. Removal at the binding stage: endotoxin is removed at the plasmid DNA binding stage.

2. Removal after elution: remove endotoxin after plasmid DNA elution.

The current endotoxin removal methods mainly include:

1. Non-selective removal: such as adsorption, ultrafiltration, and exclusion chromatography.

2. Selective precipitation: per esempio., using polymyxin B, histidines, and poly-L-lysine affinity chromatography.

3. Hydrophobic interaction chromatography and ion exchange chromatography.

Nostro endotoxin-free plasmid DNA extraction kit (metodo delle perle magnetiche) adopts a unique solution formula that requires only a few simple washes to remove endotoxin, proteine, polisaccaridi, e altre impurità, and then obtains high-quality plasmid DNA. This product extracts and purifies plasmid DNA with little damage to plasmids, high extraction concentration, and a high proportion of super-helix. The extracted plasmid DNA can be used for digestion, PCR, sequenziamento, legatura,n and transformation.

Endotoxin-free Plasmid DNA Extraction Kit for Small-volume Samples

Fornitore

Shanghai Lingjun Biotecnologia Co., Ltd.è stato fondato nel 2016 che è un produttore professionale di materiali biomagnetici e reagenti per l'estrazione degli acidi nucleici.

Abbiamo una ricca esperienza nell'estrazione e purificazione degli acidi nucleici, purificazione delle proteine, separazione cellulare, chemiluminescenza e altri campi tecnici.

I nostri prodotti sono ampiamente utilizzati in molti campi, come i test medici, test genetici, ricerca universitaria, allevamento genetico, e così via. Non solo forniamo prodotti, ma possiamo anche intraprendere l'OEM, ODM, e altre esigenze. Se hai un'esigenza correlata, non esitate a contattarci asales01@lingjunbio.com.

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