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S9430 Sigma-Aldrich

SYBR® Green I nucleic acid gel stain Green Alternative

10,000 × in DMSO



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Legal Information

U.S. Patent No. 5,436,134. Licensed from Molecular Probes, Inc.

SYBR is a registered trademark of Life Technologies


A proprietary unsymmetrical cyanine dye which is an ultrasensitive stain for post-electrophoresis staining of dsDNA in agarose or polyacrylamide gels. SYBR Green I can also be used to detect ssDNA and RNA in denaturing agarose/formaldehyde and polyacrylamide/urea gels without any prewashing steps, although the sensitivity is lower (approximately 100 to 300 pg per band using 254 nm epi-illumination). SYBR Green II is recommended for ss-DNA and RNA.

SYBR Green I stain has been shown to be much less mutagenic than ethidium bromide in Ames tests. SYBR Green I is also a very sensitive stain for oligonucleotides, allowing for detection of as little as 1-2 ng of a synthetic 24-mer on a 5% polyacrylamide gel, which is 50-100 times greater sensitivity than obtained with ethidium bromide. Staining agarose gels with SYBR Green I does not interfere with the transfer of nucleic acids to membranes or subsequent hybridization in Southern or Northern blot analysis as long as 0.1%-0.3% SDS is included in prehybridization and hybridization buffers to remove the dye.

Sigma Life Science is committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has inherently safer chemistry, compared to the standard use of ethidium bromide for staining. For more information see publication found in related content.

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Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
201.2 °F
Flash Point(C) 
94 °C
Protocols & Articles


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01494 Nancy-520, suitable for RT-PCR, ≥97.0% (HPCE)

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