News from the Bench
Discover what’s going on at CST, receive our latest application notes and tips, read our science features, and learn about our products.
To Purchase # 4083S
Find answers on our FAQs page.
- Additional protein information
- Analytical tools
Immunofluorescent analysis of HeLa cells using COX IV (3E11) Rabbit mAb #4850 (green), β-Catenin (L54E2) Mouse mAb (IF Preferred) #2677 (red) and DAPI (blue).Learn more about how we get our images
Gallery: DAPI #4083
DAPI is supplied as a lyophilized powder in 1 mg units. It can be used to examine cellular DNA in fluorescent microscopy and cytometry applications.Molecular Formula:
- Free dye excitation maximum = 340 nm
- Free dye emission maximum = 488 nm
- DNA complex excitation maximum = 364 nm
- DNA complex emission maximum = 454 nm
Directions for Use: DAPI is supplied as a lyophilized powder. For a 20 mg/ml stock, reconstitute the 1 mg in 50 µl deionized water or dimethylformamide. Please follow CST’s recommended IF and Flow protocols. For both applications, following secondary detection:
Immunofluorescence: Counterstain with DAPI as the final step in your staining procedure. Rinse samples twice in PBS for five min each. Dilute DAPI stock solution to a concentration between 1 - 0.1 µg/ml in PBS and incubate for 5 min at room temperature in the dark. Rinse samples once in PBS and then prepare for imaging. Examine immediately using appropriate excitation wavelength.
Alternatively, dilute DAPI stock solution to a concentration between 1 - 0.1 µg/ml in mounting media, apply to cells, and prepare for imaging. Examine immediately using appropriate excitation wavelength.
Flow Cytometry: Rinse samples once in Incubation Buffer. Dilute DAPI stock solution to a concentration between 1.60-0.0125 µg/ml in PBS and incubate for 15 min at room temperature in the dark before analyzing cells on flow cytometer.Storage: Storage lyophilized or in solution at 4°C, desiccated. Protect from light. In lyophilized form, the chemical is stable for 24 months. Once in solution, use within 2-3 weeks to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.
4', 6-diamidino-2-phenylindole, dihydrochloride (DAPI) is a blue fluorescent DNA dye that targets double-stranded AT clusters in the DNA minor groove (1). One molecule of dye binds to each 3 base pairs of dsDNA and yields an approximate 20-fold fluorescent enhancement (2). The level of DAPI-DNA fluorescence is proportional to DNA content (3).
For Research Use Only. Not For Use In Diagnostic Procedures. Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc. XP is a registered trademark of Cell Signaling Technology, Inc. Alexa Fluor is a registered trademark of Life Technologies Corporation. DyLight is a trademark of Thermo Fisher Scientific, Inc. and its subsidiaries.