Polyethylenimine Linear(PEI) MW40000(rapid lysis)

PEI 40000 is a highly charged cationic polymer with a molecular weight of 40,000 that binds negatively charged nucleic acid molecules very easily, forming a complex and allowing the complex to enter cells. PEI 40000 is a transient transfection reagent with low cytotoxicity, high transfection efficiency, and high gene expression efficiency in cells such as HEK293 and CHO.

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Product Information

Product Name

Cat#

Size

 

40816ES02

100 mg

Polyethylenimine Linear (PEI) MW40000(rapid lysis)

40816ES03

1 g

Product Description

PEI 40000 is a highly charged cationic polymer with a molecular weight of 40,000 that binds negatively charged nucleic acid molecules very easily, forming a complex and allowing the complex to enter cells. PEI 40000 is a transient transfection reagent with low cytotoxicity, high transfection efficiency, and high gene expression efficiency in cells such as HEK293 and CHO.

PEI 40000 has many advantages over PEI 25000 Transfection Reagent. include:

1 PEI 40000 is easy to dissolve and can be directly dissolved in water. PEI 25000 needs to first adjust the water to weak acid to help it dissolve, and then use NaOH to adjust the pH to neutral;

2 PEI 40000 is easy to operate, easier to use, and has better transfection effect than PEI 25000; 3. PEI 25000 contains 4-11% propionyl residues, which can prevent the polymer backbone from binding to DNA. Compared to PEI 25000, PEI 40000 is a completely shed construction, so its performance is consistently efficient.

This product is an instant type, which dissolves quickly and is easy to prepare.

Product Properties

English Name

Polyethylenimine Linear (PEI) MW40000 

CAS No.

49533-93-7

Molecular formula

(CH2CH2NH)n

Molecular weight

40,000

Appearance

Wite or off-white solid

Solubility

Soluble in water, insoluble in organic solvents: benzene, ether and acetone

Structure

Shipping and Storage

The product is shipped at room temperature and the powder can be stored at 2-8ºC for two years. The stock solution is stored at 2-8 ºC for 3 months.

Cautions

1) For most cells, 3.0 μL of PEI 40000 Transfection Reagent per 1 μg of DNA yields high transfection efficiencies. Also try to optimize using linear PEI 40000 transfection reagent in volumes of 1.5~4 μL per 1 μg of DNA..

2) For your safety and health, please wear lab coats and disposable gloves for operation.

3) For research use only!

Storage liquid configuration(1 mg/mL)

1. Material

PEI 40000, Milli-Q® water/water for injection (WFI) or similar bio-grade water, 12 mol/L hydrochloric acid,1 mol/L sodium hydroxide (NaOH), disposable 0.1~0.2 μm PES vacuum sterile filter, sterile HDPE or poly Acrylic storage bottle.

 

2. Configure the storage solution(1 mg/mL)

1) In a 1 L glass beaker, add 1 g of PEI 40000 powder to 900 mL of Milli-Q® ultrapure water or other equivalent biological water, stir evenly on a magnetic stirrer, and generate small vortices.

2) Wait until PEI 40000 is completely dissolved (usually less than 5 mins);

3) Use 12 mol/L hydrochloric acid and1 mol/L sodium hydroxide solution dropwise while stirring to adjust the pH to 6.80~6.90;

 

Note please use hydrochloric acid to adjust the pH value to 6.80~6.90;

5) Transfer the solution to a graduated cylinder, and add water to make up to 1 L.

6) Filter and sterilize with a disposable 0.1~0.2 µm PES vacuum filter to obtain a stock solution of 1 mg/mL.

7) Aliquot as needed and store at 2-8 °C, stable for 3 months.

 

Instructions (Take the 6-well plate as an example)

1. Inoculate cells: In order to improve the transfection efficiency, it is recommended to inoculate cells one day before transfection, and the cell density should be 70%~80%.

2. Prepare DNA-PEI complexes: Prepare DNA-PEI nucleic acid-transfection reagent complexes according to the following system:

1) For each well of cells, dilute 2 μg of target DNA with 100 μL of serum-free medium, and mix thoroughly to form a DNA dilution solution.

Note Opti-MEM or ddH2O is recommended for serum-free diluents.

2) Immediately add 4 μL of PEI 40000 Transfection Reagent to 100 μL of DNA Diluent,  mix well gently.

3) Incubate at room temperature for 10-15 mins to form a DNA-PEI cationic nucleic acid transfection reagent complex.

3. Transfect cells

1) During complex formation, remove cell growth medium and add 2 mL of fresh prewarmed complete medium to each well.

2) Add 100 μL of DNA-PEI nucleic acid-PEI complex directly to the cells, and mix gently.

3) Culture in a 37 ℃, 5% CO2 incubator, and the expression of the transfected gene can be detected as soon as 5 hours after transfection. Please determine the appropriate detection time by yourself.

4. Steady transfer screening (optional)

24 h after transfection, cells were passaged into fresh growth medium (dilute cells more than 10-fold) and incubated overnight at 37 °C in a 5% CO2 incubator. The screening drug matching the transfection resistance gene was added the next day. Drug-resistant clones can be screened in about 1 to 2 weeks, and the growth medium containing the screened drugs needs to be changed frequently during this period.

The amount of transfection in different cell culture vessels (for reference only):

 

 

Culture vessel

Surf. area per well 1 (cm2)

DNA(μg)

transfection reagent(μL)

Vol. of dilution medium 2(μL)

Vol. of plating medium

96-well

0.3

0.1

0.1

10

100 μL

48-well

0.7

0.2

0.3

20

200 μL

24-well

1.9

0.5

1

50

500 μL

12-well

3.8

1

2

50

1 mL

6-well

10

2

4

100

2 mL

Flask 25cm2

21

4

8

200

4 mL

Flask 75cm2 

58

10

20

500

10 mL

1. The surface area of cell culture plates provided by different manufacturers may vary;

2. Volume of medium used to dilute DNA.