Different SYBR dyes bind to dsDNA, ssDNA, and RNA, but vary in the sensitivity and specificity with which they bind to different nucleic acids. SYBR Green I Nucleic Acid Gel Stain is used for staining dsDNA and ssDNA. SYBR Green II RNA Gel Stain will stain dsDNA and ssDNA but has better sensitivity for RNA. SYBR Gold Acid Gel Stain was developed after SYBR Green I and II and is the most sensitive fluorescent gel stain offering the highest sensitivity for both DNA and RNA. SYBR Safe DNA Gel Stain is a reduced mutagenicity formula designed for use with blue light systems. It is less sensitive than the SYBR Green I and II but comparable to ethidium bromide.
Please check the following link for additional details regarding the different SYBR dyes: The Molecular Probes Handbook: Nucleic Acid Detection on Gels, Blots and Arrays
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