Toto-1 | CAS 143413-84-7

TOTO-1 is a fluorescent nucleic acid stain designed for strong labeling of double-stranded and other nucleic-acid conformations, producing bright emission when bound to DNA/RNA. In fluorescence workflows, it is frequently used to visualize nucleic acids, quantify DNA content, and monitor nucleic-acid processing in assay formats where a DNA-binding dye provides robust signal over background. Its utility in molecular imaging and nucleic-acid analysis stems from its established performance as a general-purpose fluorescent probe for DNA/RNA rather than a target-selective sequence probe.

1. DNA Content Quantification

TOTO-1 is widely used in nucleic acid analysis workflows to quantify DNA abundance in research samples such as purified genomic DNA, plasmid DNA, and PCR-amplified products. In plate-based fluorescence assays, the dye provides a convenient readout for comparing DNA amounts across experimental conditions, including sample normalization steps in molecular biology pipelines. Researchers often pair TOTO-1 staining with standard fluorescence plate readers to obtain rapid, high-throughput measurements of nucleic-acid levels without requiring sequence-specific probes.

2. Fluorescence Microscopy DNA Staining

TOTO-1 supports fluorescence microscopy studies where nucleic acids must be visualized in fixed cells, cultured cell preparations, or nucleic-acid-containing biomaterials. Imaging workflows commonly use the dye to highlight nuclear and extranuclear DNA distributions, enabling assessment of nuclear morphology and nucleic-acid localization patterns alongside other fluorescent markers. Because TOTO-1 is a DNA/RNA-binding stain, it is frequently selected as a general nucleic-acid channel for multicolor microscopy experiments that require a dependable nucleic-acid signal for spatial context.

3. Gel And Electrophoresis Imaging

TOTO-1 is used as a fluorescent DNA stain for visualizing nucleic acids following agarose gel electrophoresis, including routine checks of PCR products, restriction digests, and DNA size/quality assessment in research laboratories. In gel imaging workflows, the dye enables convenient visualization under appropriate excitation/emission settings and is often selected for its ability to report nucleic-acid bands with clear contrast relative to unstained background. This makes TOTO-1 a practical choice for documenting electrophoresis outcomes and supporting downstream decisions in molecular cloning and analysis workflows.

4. Nucleic Acid Flow Cytometry

TOTO-1 is applied in flow cytometry and related single-cell analysis experiments to measure DNA content and nucleic-acid-associated fluorescence signals at the single-cell level. In cell-cycle and nucleic-acid distribution studies, the dye provides a DNA-dependent fluorescence channel that supports gating strategies and quantitative comparisons between experimental groups. Researchers typically integrate TOTO-1 staining into established cytometry staining panels where nucleic-acid fluorescence serves as a primary parameter for cell-cycle staging or nucleic-acid-related phenotyping.