DAPI, blue fluorescent nucleic acid stain
| 貨號 | 數量 | 價格 | 交貨時間 | 購買此產品 |
|---|---|---|---|---|
| 2996-1mL | 1 mL, 1 mg/mL in Water | $75 | 現貨 | |
| 2996-50uL | 50 uL, 1 mg/mL in Water | – | 現貨 | |
| 2996-1mg | 1 mg | $30 | 現貨 | |
| 2996-10mg | 10 mg | $110 | 現貨 |
DAPI (4′,6-diamidino-2-phenylindole) is a blue-emitting fluorescent dye that binds strongly to adenine-thymine-rich regions in DNA. It is used extensively in fluorescence microscopy, flow cytometry for chromosome staining and as a nuclear counterstain. DAPI is generally used to stain fixed cells since the dye is membrane impermeant, although the dye can enter live cells when used at high concentrations.
When bound to double-stranded DNA, DAPI exhibits ~20-fold enhancement of fluorescence with an absorption maximum at 355 nm and emission maximum at 460 nm. DAPI also binds to RNA, though it is not as strongly fluorescent. When bound to RNA, its emission spectrum shifts to around 500 nm.
There is a slight fluorescence overlap between DAPI and green-fluorescent molecules like fluorescein and GFP. Use spectral unmixing if extremely precise image analysis is required.
DAPI is several times more sensitive than ethidium bromide for staining DNA in agarose gels. It may be used for photofootprinting DNA and detecting annealed probes in blotting applications by specifically visualizing the double-stranded complex. Also, DAPI staining is a sensitive and specific detection method for mycoplasma.
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生物素炔 (Biotin alkyne)
生物素炔是一種反應性親和標記物，可以通過點擊反應附著到生物分子上。Cyanine7.5 NHS酯 (Cyanine7.5 NHS ester)
近紅外熒光染料 Cyanine7.5 的胺反應性的 NHS 酯。
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FAM DBCO, 6-isomer
Cyclooctyne derivative of fluorescein (FAM) for copper-free click chemistry reaction with azides. Pure 6-isomer of fluorescein.General properties
| Appearance: | yellow solid / solution |
| Molecular weight: | 350.25 |
| CAS number: | 28718-90-3 |
| Molecular formula: | C16H17Cl2N5 |
| Solubility: | good in DMF, DMSO |
| Quality control: | NMR 1H and HPLC-MS (95+%) |
| Storage conditions: | 24 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Desiccate. |
| MSDS: | 下載 |
| 產品規格 |
Spectral properties
| Excitation/absorption maximum, nm: | 355 |
| ε, L⋅mol−1⋅cm−1: | 28800 |
| Emission maximum, nm: | 460 |
產品引用
- Potapenko, E.Y..; Kashko, N.D.; Knorre, D.A. Spontaneous Mutations in Saccharomyces cerevisiae mtDNA Increase Cell-to-Cell Variation in mtDNA Amount. International Journal of Molecular Sciences, 2023, 24(24), 17413. doi: 10.3390/ijms242417413
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