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Can DAPI be excited with laser confocal λ=405nm after staining the nucleus?

Can DAPI be excited with laser confocal λ=405nm after staining the nucleus?

Yes, DAPI can be excited using 405 nm excitation light. Although the best wavelength for excitation of DAPI is in the ultraviolet region (~350-360 nm), it can also be effectively excited with blue light at 405 nm. Using a 405 nm excitation light source can still activate DAPI and produce blue fluorescence for viewing and imaging cell nuclei.

Categories: Frequently Asked Questions: Products, Experiments and Troubleshooting
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Da — when not otherwise indicated, molecular weight units are daltons.   Mw — weight-average molecular weight.   Mn — number-average molecular weight.

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Aladdin Scientific. "Can DAPI be excited with laser confocal λ=405nm after staining the nucleus?" Aladdin Knowledge Base, updated 9 jun 2025. https://www.aladdinsci.com/us_es/faqs/can-dapi-be-excited-with-laser-confocal-after-staining-en.html
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