PowerFect™ In Vitro siRNA Transfection Reagent (Ver. II)

What it means: The Transfection Type is siRNA Transfection: the reagent is formulated for small RNA cargo such as siRNA and miRNA used in gene knockdown. siRNA Transfection reagents are tuned for short duplex RNA rather than for large plasmids.

Why it matters:

• siRNA Transfection delivers the duplex to the cytoplasm, where the RNAi machinery acts on the target mRNA
• Knockdown is read out as reduced mRNA or protein, usually 24 to 72 hours after transfection
• The siRNA concentration and reagent volume per well are set by the protocol; both affect knockdown and cell health
• Vendor stated yield: A 1.0 mL vial is sufficient for approximately 1,330 transfections in 24-well plates using 5 pmol siRNA per well

How to interpret here: Use this siRNA Transfection reagent for RNAi knockdown; for plasmid DNA choose a DNA Transfection reagent from the same family.

Tip: Run a non-targeting control siRNA alongside; it separates the knockdown effect from the effect of siRNA Transfection itself.

What it means: The Application Setting is In Vitro: the reagent is intended for cultured cells in plates, dishes or flasks. An In Vitro setting means the transfection complex is added to the culture medium and taken up by the cells over a few hours.

Why it matters:

• In Vitro protocols are defined per well or plate format, so the reagent volume scales with the culture surface
• Serum, confluence and cell type affect efficiency and toxicity
• Results are read out in the same cells 24 to 72 hours later

How to interpret here: Use this reagent for In Vitro cell-culture transfection; it is not an animal-use product.

Tip: Seed cells the day before so they are 70 to 90 percent confluent and actively dividing at the time of In Vitro transfection.

What it means: The Formulation is General-Purpose: not tuned to one cell line. A General-Purpose reagent is the base product of its family and is used across many adherent and suspension cell types.

Why it matters:

• A General-Purpose reagent covers many cell types with one product
• A short optimization of the reagent-to-nucleic-acid ratio is recommended for a new cell type
• Pre-optimized versions of the same family exist for specific lines and skip that step

How to interpret here: Choose General-Purpose when you work across several cell lines; choose a pre-optimized version if one exists for your line.

Tip: Test two or three ratios in a small plate first; the General-Purpose protocol gives the starting range.

What it means: Storage is Reagent: 4 °C; Buffer: RT. Vendor statement: – Powerfect™ Reagent: Store at 4 °C. – Powerfect™ Transfection Buffer (5×): Store at room temperature. When stored properly, both components remain stable for 24 months or longer. The Storage condition is the temperature the vendor tested the stability window against.

Why it matters:

• Storage at Reagent: 4 °C; Buffer: RT keeps the reagent within the vendor stability window
• Repeated warming and cooling, or freezing when not stated, can reduce transfection efficiency
• A kit with a reagent and a buffer can have two conditions; each component is stored at its own

How to interpret here: Store at Reagent: 4 °C; Buffer: RT on receipt and keep the vial closed between uses.

Tip: Let a refrigerated reagent reach room temperature before opening so condensation does not enter the vial.

What it means: Shelf Life is 24 months: the vendor states the product is stable for 24 months or longer when stored as directed. The Shelf Life is a stability statement for the product line, not a lot-specific expiry.

Why it matters:

• A 24 months shelf life lets one vial cover a multi-month project
• Stability applies only under the stated storage condition
• Buying a larger size is practical when the reagent will be used within the 24 months window

How to interpret here: Note the receipt date; 24 months is the vendor stability statement rather than an expiry printed per lot.

Tip: If efficiency drops late in the 24 months window, run the reporter control again before changing other variables.