SYBR Gold Nucleic Acid Gel Stain: Protocol & Best Practices

SYBR Gold Nucleic Acid Gel Stain is an ultra-sensitive fluorescent dye designed for staining single- or double-stranded DNA and RNA in agarose or polyacrylamide gels, offering significantly higher sensitivity than ethidium bromide.

Excitation Maximum

Approximately 495 nm (visible light compatible)

Emission Maximum

Approximately 537 nm (green emission)

Compatible Nucleic Acid Types

dsDNA, ssDNA, and RNA

Typical Working Dilution

1:10,000 in 1× TBE or TAE buffer

Staining Time

30–60 minutes at room temperature with gentle agitation

Recommended Imaging System

Blue-light or UV transilluminator; compatible with standard GFP/FITC filter sets

Materials and Reagents Required

Before beginning the protocol, ensure the following materials are available:

• SYBR Gold Nucleic Acid Gel Stain (Aladdin Scientific, SKU S1540201) – supplied as a 10,000× concentrate in DMSO
• 1× TBE or 1× TAE electrophoresis buffer
- Agarose or polyacrylamide gel containing resolved nucleic acid samples
• Nuclease-free water
• A clean gel staining tray or container
• UV or blue-light transilluminator with appropriate filter set (GFP/FITC compatible)
• Nitrile gloves and UV-protective eyewear
• Imaging software or gel documentation system

Storage: Store the SYBR Gold concentrate at −20 °C, protected from light. The working solution should be prepared fresh and used within the same working day.

Step-by-Step Staining Protocol

Step 1 – Prepare Working Solution
Dilute SYBR Gold Nucleic Acid Gel Stain 1:10,000 in 1× TBE or 1× TAE buffer. For example, add 5 µL of the 10,000× concentrate to 50 mL of buffer to obtain a sufficient volume to submerge the gel. Prepare this solution fresh and protect it from light.

Step 2 – Complete Electrophoresis
Run the agarose or polyacrylamide gel until adequate separation of nucleic acid bands is achieved. Standard electrophoresis conditions apply. Do not add SYBR Gold directly to the gel or running buffer before the run, as this may affect migration.

Step 3 – Post-Stain the Gel
After electrophoresis, carefully transfer the gel to the staining tray containing the freshly prepared SYBR Gold working solution. Ensure the gel is fully submerged. Incubate for 30–60 minutes at room temperature with gentle, continuous agitation on an orbital shaker or rocker.

Step 4 – Optional Destaining
For most applications, destaining is not required and may reduce sensitivity. If background fluorescence is too high, rinse the gel briefly (5–10 minutes) in fresh 1× electrophoresis buffer.

Step 5 – Imaging
Image the stained gel using a blue-light or UV transilluminator. SYBR Gold is optimally excited near 495 nm, and emission is detected near 537 nm. Use a GFP or FITC bandpass emission filter for best results. Capture images using a gel documentation system or camera equipped with appropriate filters.

Troubleshooting and Optimization Tips

Low Signal / Faint Bands: Ensure the staining time is sufficient (at least 30 minutes). Verify that the working solution was prepared at the correct dilution (1:10,000). Check that the imaging system uses an appropriate excitation source and emission filter compatible with SYBR Gold spectra. Prolonged storage of diluted working solution may lead to dye degradation; always prepare fresh.

High Background Fluorescence: Reduce staining time or perform a brief destaining step in fresh electrophoresis buffer (5–10 minutes). Ensure the staining tray is clean and free of fluorescent contaminants.

Uneven Staining: Ensure the gel is fully submerged throughout the staining period and that agitation is continuous and uniform. Very thick gels may require extended staining times.

Smearing of Bands: This is typically a consequence of electrophoresis conditions rather than the stain. Check sample preparation, loading buffer composition, and voltage settings.

Sensitivity Considerations: SYBR Gold is reported to be substantially more sensitive than ethidium bromide for detecting nucleic acids in gels. For very low-abundance samples, extend staining to 60 minutes and minimize exposure to ambient light throughout the process.

Safety and Disposal

Personal Protective Equipment: Always wear nitrile gloves, a lab coat, and UV-protective eyewear when handling SYBR Gold solutions or stained gels under UV illumination. Avoid direct skin contact with the dye solution.

Mutagenicity: SYBR Gold is a nucleic acid intercalating dye. While it is considered less acutely hazardous than ethidium bromide, it should be treated as a potential mutagen. Refer to the Safety Data Sheet (SDS) provided with the product for complete hazard information.

Waste Disposal: Dispose of SYBR Gold working solutions and stained gels in accordance with your institution's chemical waste disposal guidelines and applicable local regulations. Do not pour staining solutions down the drain without confirming compliance with local regulations.

Spill Management: In the event of a spill, absorb the liquid with an appropriate adsorbent material, collect waste in a labeled container, and decontaminate the area with water. Consult the SDS for specific spill response procedures.

Frequently asked questions

Can SYBR Gold be added directly to the gel or running buffer before electrophoresis?

It is not recommended to add SYBR Gold to the gel or running buffer prior to electrophoresis. Pre-staining with intercalating dyes can affect nucleic acid migration patterns and band resolution. Post-staining after electrophoresis is the recommended approach for optimal results.

Is SYBR Gold suitable for staining RNA gels, including denaturing gels?

Yes, SYBR Gold is suitable for staining both DNA and RNA, including single-stranded nucleic acids. It can be used with denaturing agarose or polyacrylamide gel systems. Its high sensitivity makes it particularly useful for detecting low-abundance RNA species.

How does SYBR Gold compare in sensitivity to ethidium bromide?

SYBR Gold is reported to be significantly more sensitive than ethidium bromide for detecting nucleic acids in gels. It is particularly advantageous for detecting small quantities of nucleic acids, including single-stranded DNA and RNA, which are poorly stained by ethidium bromide. The exact fold-difference in sensitivity should be verified against current literature.

What imaging equipment is compatible with SYBR Gold stained gels?

SYBR Gold stained gels can be imaged using a blue-light or UV transilluminator. The dye is optimally excited near 495 nm and emits near 537 nm, making it compatible with standard GFP or FITC filter sets on gel documentation systems. A blue-light source is preferred to minimize nucleic acid damage during imaging.

How should the SYBR Gold stock solution be stored to maintain activity?

The SYBR Gold Nucleic Acid Gel Stain concentrate should be stored at −20 °C, protected from light. Avoid repeated freeze-thaw cycles by aliquoting the stock solution upon receipt. Working solutions should be prepared fresh on the day of use and discarded after the experiment.

References

1. Molecular Probes / Thermo Fisher Scientific. SYBR Gold Nucleic Acid Gel Stain product information and technical notes. (General manufacturer technical documentation.)
2. Sambrook J, Russell DW. Molecular Cloning: A Laboratory Manual, 3rd edition. Cold Spring Harbor Laboratory Press, 2001. (General nucleic acid gel electrophoresis and staining procedures.)
3. Tuma RS, et al. Characterization of SYBR Gold nucleic acid gel stain: a dye optimized for use with 300-nm ultraviolet transilluminators. Analytical Biochemistry. 1999;268(2):278-288.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.