Reagents List

Product Name	Cat.NO.
Hieff Trans™ Booster DNA/RNA Transfection Reagent	40801ES

HGC27-siRNA Transfection Protocol

Cell Culture and Passaging (T12.5 Flask)

• Washing: Aspirate the old medium, add 3–4 mL of room-temperature PBS, gently swirl to rinse for 10–20 seconds, then aspirate.
• Digestion: Add 1 mL of trypsin to cover the bottom of the flask and incubate at 37°C for digestion.
• Detachment: When cells begin to separate and round up, gently pipette the trypsin up and down to dislodge the cells.
• Termination: Add 2–3 mL of complete medium to inactivate the trypsin, then pipette to resuspend and create a uniform cell suspension.
• Seeding: Transfer the suspension to a centrifuge tube, centrifuge at 200 × g for 3–5 minutes, aspirate the supernatant, resuspend the cell pellet in fresh medium, seed into new culture vessels, and add fresh medium to the required volume for continued culture.

Cell Transfection (T25 flasks)

I. Preparation

1. Cell Preparation: 24 hours before transfection, detach cells using trypsin, resuspend, and perform cell counting. Seed cells at an appropriate density into T12.5 flasks (or other culture vessels) with 3 mL of complete medium per flask. The goal is to achieve 60–80% confluency at the time of transfection.

2. Reagent Preparation:

• siRNA: Synthesize high-quality siRNA; typically, three distinct siRNA sequences are designed and tested for validation.
• Transfection Reagent: Allow Hieff Trans™Booster Transfection Reagent to equilibrate to room temperature before use. Mix gently by pipetting.
• Serum-free Medium: Prepare a serum-free base medium (e.g., Opti-MEM) for diluting siRNA and transfection reagent.

II. Preparation of Transfection Complexes

• Dilute siRNA: In a sterile centrifuge tube, add 150 μL of serum-free medium, followed by 10 μL of siRNA (20 μM). Mix gently to obtain diluted siRNA solution.
• Dilute Transfection Reagent: In another sterile centrifuge tube, add 150 μL of serum-free medium, followed by 10 μL of Hieff Trans™Booster transfection reagent. Gently pipette to mix.
• Mix and Incubate: Add the diluted siRNA solution to the tube containing the diluted transfection reagent. Mix gently by pipetting. Incubate the mixture at room temperature for 10–15 minutes to allow formation of stable siRNA-transfection reagent complexes.

III. Transfection

1. Medium Replacement: Before adding the complexes, carefully remove the old culture medium and replace it with 3 mL of fresh, pre-warmed complete medium.

2. Add Complexes: Add the siRNA-Booster complexes dropwise and evenly to the cells (total volume ~300 μL). Gently rock the plate/flask to ensure uniform distribution.

3. Incubation: Return cells to a 37°C, 5% CO₂ incubator for culture.

IV. Post-Transfection Handling

1. Medium Replacement: 4–6 hours post-transfection, carefully examine cell morphology. If significant cytotoxicity is observed, aspirate the medium containing the complexes and replace with 3 mL fresh, pre-warmed complete medium. If cells appear healthy, medium change is not required.

2. Analysis: Continue culturing for 24–72 hours post-transfection.

Evaluate transfection efficiency and gene knockdown by measuring fluorescent protein expression, mRNA levels (qPCR), or protein expression (Western blot) according to your experimental design.

Tips:

1. If significant cytotoxicity occurs, replace medium after 6 h or reduce Enhancer volume by half to mitigate toxicity.  

2. If transfection efficiency is low, increasing the amount of transfection reagent may improve results.  

3. For optimal performance, dilute siRNA and transfection reagent in Opti-MEM rather than DMEM.  

4. The transfection system is compatible with serum and antibiotics; however, siRNA and reagent dilutions must be performed in serum- and antibiotic-free medium.

Experimental Results Analysis

1. Transfection Example for 6-Well Plate

 

Figure 1. siRNA transfection in HGC-27 cells using Hieff Trans™ Booster DNA&RNA Transfection Reagent versus L*3000. The result demonstrates that Booster achieves a stronger gene knockdown effect.

Different Cell Culture Vessel Transfection Volumes (for reference only):

Culture vessel	Medium Volume		DNA Transfection			siRNA Transfection (Final Concentration 50 nM)
	Volume of Medium	Volume of Opti-MEM Complex	DNA (μg)	Booster Transfection Reagent (μL)	Transfection Enhancer (μL)	Volume of siRNA (Initial Concentration 20 μM)	Booster Transfection Reagent (μL)
96-well	100 μL	2×5 μL	0.1	0.2	0.2	0.25 μL	0.3
48-well	250 μL	2×12.5 μL	0.25	0.5	0.5	0.625 μL	0.75
24-well	500 μL	2×25 μL	0.5	1	1	1.25 μL	1.5
12-well	1 mL	2×50 μL	1	2	2	2.5 μL	3
6-well	2 mL	2×125 μL	2.5	5	5	5 μL	7.5
60 mm	5 mL	2×250 μL	5-10	10-20	10-20	12.5 μL	20
10 cm	10 mL	2×500 μL	15-25	30-50	30-50	25 μL	40
T25	6 mL	2×250 μL	6-12	12-24	12-24	15 μL	24
T75	15 mL	2×750 μL	20-40	40-80	40-80	37.5 μL	60

[Note]: The volumes provided in this table are for reference only and are suitable for both suspension and adherent cells. For suspension cells, the test can be performed at a cell density of 0.5–1×10⁶ cells/mL. The actual amounts of DNA and Booster DNA/RNA transfection reagent should be optimized depending on cell type and other experimental conditions. It is recommended to maintain a ratio between 1:0.5 and 1:5 (DNA : Booster transfection reagent). The amount and experimental conditions for mRNA are the same as those for DNA. If the cells are particularly fragile and excessive cell death is observed, better results may be achieved by reducing the amount of enhancer by half.

 

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