CalFectin™ Mammalian Cell Transfection Reagent

What it means: The Transfection Type is DNA Transfection: the reagent is formulated for plasmid DNA delivery into cultured mammalian cells. DNA Transfection reagents complex with the plasmid and carry it across the cell membrane so the encoded gene can be expressed.

Why it matters:

• DNA Transfection supports transient expression and, with antibiotic selection, stable cell lines
• Plasmid quality and the DNA-to-reagent ratio are the main drivers of efficiency
• Reporter, overexpression and CRISPR plasmids are all delivered the same way

How to interpret here: Use this DNA Transfection reagent for plasmid work; for siRNA or miRNA choose an siRNA Transfection reagent from the same family.

Tip: Include a reporter plasmid such as GFP in the first DNA Transfection to check efficiency before committing the experimental construct.

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 4 °C. Vendor statement: Store at 4 °C. If stored properly, the product is stable for 12 months or longer. The Storage condition is the temperature the vendor tested the stability window against.

Why it matters:

• Storage at 4 °C 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 4 °C 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 12 months: the vendor states the product is stable for 12 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 12 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 12 months window

How to interpret here: Note the receipt date; 12 months is the vendor stability statement rather than an expiry printed per lot.

Tip: If efficiency drops late in the 12 months window, run the reporter control again before changing other variables.