Cy3 Goat Anti-Mouse IgG (H+L) Antibody: Affinity-Purified Fluorescent Secondary for Sensitive Mouse IgG Detection

Executive Summary: The Cy3 Goat Anti-Mouse IgG (H+L) Antibody is an affinity-purified, polyclonal secondary antibody specifically designed for detecting mouse immunoglobulins in fluorescence-based assays (APExBIO). The Cy3 fluorophore enables sensitive and quantitative detection in immunofluorescence and flow cytometry (cy3tsa.com). Immunoaffinity purification ensures high specificity and minimal cross-reactivity. This reagent is validated for robust signal amplification in proteomics workflows, as demonstrated in early diabetic nephropathy biomarker studies (iScience, 2024). The antibody is compatible with a wide range of buffers and storage conditions, supporting reproducibility and long-term stability.

Biological Rationale

Secondary antibodies are essential for signal amplification in immunoassays by binding to primary antibodies and enabling detection via conjugated tags. Mouse IgG is a common target in biomedical research, especially in studies involving murine models of human disease (iScience, 2024). Sensitive detection of mouse IgG is critical for quantitative biomarker discovery, as exemplified in proteomics-based studies of diabetic nephropathy progression. The Cy3 Goat Anti-Mouse IgG (H+L) Antibody addresses the need for robust, fluorescent secondary antibodies to improve assay sensitivity and reproducibility (streptavidin-cy5.com).

Mechanism of Action of Cy3 Goat Anti-Mouse IgG (H+L) Antibody

This antibody is generated by immunizing goats with pooled mouse immunoglobulins (IgG, heavy and light chains) to elicit a polyclonal response. The resulting antibodies are affinity-purified via immunoaffinity chromatography to enrich for mouse IgG specificity (cy3tsa.com). Each molecule is covalently conjugated to the Cy3 fluorophore, providing a bright signal upon excitation at 550 nm (emission at 570 nm). When applied in immunofluorescence, flow cytometry, or immunohistochemistry, the Cy3 Goat Anti-Mouse IgG (H+L) Antibody binds to mouse primary antibodies, enabling detection and quantification of antigens (goat-anti-mouse.com). Multiple secondary antibodies can bind a single primary antibody, amplifying the detection signal.

Evidence & Benchmarks

• Affinity-purified polyclonal goat anti-mouse IgG (H+L) antibodies demonstrate high specificity and minimal cross-reactivity with non-mouse IgGs (cy3tsa.com).
• Cy3 conjugation provides peak excitation/emission wavelengths of 550/570 nm, supporting compatibility with standard fluorescence microscopy and flow cytometry platforms (APExBIO).
• In quantitative proteomics workflows targeting diabetic nephropathy biomarkers, Cy3-labeled secondary antibodies enabled detection of low-abundance proteins at picomole levels (Peng et al., DOI:10.1016/j.isci.2024.108834).
• Long-term storage at -20°C (up to 12 months) with 23% glycerol and 0.02% sodium azide preserves antibody integrity and fluorescence intensity (APExBIO).
• Validated applications include immunofluorescence, flow cytometry, and immunohistochemistry—with documented benchmarking in cell-based and proteomic assays (cy3tsa.com).

Applications, Limits & Misconceptions

The Cy3 Goat Anti-Mouse IgG (H+L) Antibody is optimized for several key applications:

• Immunofluorescence (IF): Enables visualization of target proteins in fixed cells/tissues with high sensitivity (streptavidin-cy5.com).
• Flow Cytometry: Detects and quantifies mouse IgG-labeled cell populations, supporting single-cell analysis.
• Immunohistochemistry (IHC): Allows spatial localization of antigens in tissue sections via fluorescence.
• Quantitative Proteomics: Supports sensitive biomarker discovery, as exemplified in analysis of diabetic nephropathy candidates (Peng et al., iScience, 2024).

This article extends previous analyses (fluoresceintsa.com) by presenting detailed performance benchmarks and clarifying long-term storage and workflow integration parameters.

Common Pitfalls or Misconceptions

• Not suitable for detection of non-mouse primary antibodies (e.g., rabbit, rat, or human IgG).
• Repeated freeze/thaw cycles degrade antibody performance and fluorescence signal.
• Exposure to light leads to Cy3 photobleaching, reducing signal intensity.
• Excessive antibody concentrations can result in high background due to non-specific binding.
• Use outside recommended buffer conditions (e.g., absence of BSA or presence of reducing agents) may compromise specificity and stability.

Workflow Integration & Parameters

Preparation: The antibody is supplied as a liquid at 1 mg/mL in PBS, 23% glycerol, 1% BSA, and 0.02% sodium azide. Upon receipt, short-term storage (≤2 weeks) at 4°C is recommended. For long-term use, aliquot and store at -20°C, avoiding freeze/thaw cycles (APExBIO).

Assay Setup: Typical working dilutions range from 1:200 to 1:1,000, depending on the application and primary antibody abundance. Protect from light during incubation and storage.

Detection: Excitation at 550 nm and emission at 570 nm allow compatibility with standard filter sets. Quantitative imaging and flow cytometry require calibration controls to ensure linearity of signal detection.

For further guidance, see "Optimizing Cell-Based Assays with Cy3 Goat Anti-Mouse IgG" (cy3tsa.com), which details troubleshooting and best practices for reproducible results in cell-based workflows; this article adds explicit benchmarks for storage and photostability.

Conclusion & Outlook

The Cy3 Goat Anti-Mouse IgG (H+L) Antibody from APExBIO offers a robust, validated solution for sensitive detection of mouse immunoglobulins in immunofluorescence, flow cytometry, and proteomics applications. Its combination of affinity purification, Cy3 fluorescence, and flexible storage makes it suitable for quantitative biomarker studies, including early disease detection. Future directions include further integration into multiplexed proteomics and high-throughput screening platforms for translational research.

For technical specifications or ordering, refer to the product page.