Cell Biology


We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product was designed as a safer chemical. Ethidium bromide is a potent mutagen, but is easily replaced by Nancy 520 - a safer chemical for nucleic acid staining. The Ames test results shown below illustrate how much safer we can make our staining procedures.

Nancy-520 fluorescent stain is specific for double-stranded DNA in agarose gels.


Less mutagenic than SYBR Green I (Ames test)
Higher sensitivity than ethidium bromide
  Ames II mutagenicity assay performed using Ethidium bromide (blue), SYBR Green I (red) and Nancy-520 (green). Nancy-250 produces fewer frame shift or base-pair substitution mutations than either ethidium bromide or SYBR Green I.



Nancy-520 Gel Image Fast and robust staining with less photobleaching
Excitation/Emission settings similar to SYBR Green I
   – no additional filters or light source needed
  DNA marker (Lambda DNA Hind III digest) at 200 ng/lane (left) and 20 ng/lane (right) was separated on a 1% agarose gel, stained with either Nancy-520 or SYBR Green I post-electrophoresis, and imaged. Nancy-520 produces sharp, clear bands with detection down to 0.84 ng of DNA.
A. Nancy-520, λex UV screen (300 nm)/λem 590 nm
    bandpass filter with CCD camera.
B. Nancy-520, laser scanner Fuji® FLA-3000, λex
    532 nm/λem 580 nm cut-off filter.
C. SYBR Green I, λex UV screen (300 nm)/λem 590 nm
    bandpass filter with CCD camera.
D. SYBR Green I, laser scanner Fuji® FLA-3000, λex
    473 nm/λem 520 nm cut-off filter.



Quantitation Graph Image Suitable for dsDNA quantitation in solution
   Linear detection range 0-2 µg/ml of DNA
  Quantitation of DNA (Lambda DNA Pst I Digest) in solution using Nancy-520, performed in a 96 well plate. Fluorescence was measured on a laser-scanner (FLA-3000, Fuji) with 532 nm excitation and 580 nm emission filter. Different concentrations of DNA in TE buffer, pH 7.5, and their corresponding fluorescence values are shown.


For additional information and to order Nancy-520 (Product Number 01494), please visit the product page.