Rbt Xhmstr IgG F(ab’)2 Unconjugated — High-Specificity Secondary Antibody for Research Workflows
What it is
Rbt Xhmstr IgG F(ab’)2 Uncnj is a rabbit-derived polyclonal F(ab’)2 fragment directed against hamster IgG (γ-chain). The Fc region is enzymatically removed, minimizing Fc-mediated interactions with Fc receptors and reducing background in applications such as ELISA, Western blot, immunohistochemistry (IHC), immunofluorescence (IF), and flow cytometry under research conditions. For background on immunoglobulin structure and fragments, see reference materials at NIH/NCBI (Ig basics, protein records, taxonomy) and NIGMS/NIH (overview of biomolecules).
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Target: Hamster IgG (Mesocricetus auratus)
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Host: Rabbit
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Fragment: F(ab’)2, unconjugated (no enzyme/fluor tag)
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Typical use: secondary detection of hamster-primary antibodies in research assays
Further reading: NIH, NCBI Home, NLM/NIH, NIAID/NIH, NIBIB/NIH, Genome.gov.
Why F(ab’)2?
Removing the Fc portion reduces non-specific binding mediated by Fc receptors and complement. This is particularly useful in tissues or cell types with high FcR expression. For fundamentals of receptor–antibody interactions and assay design, see NCBI Bookshelf (core methods) and NIST metrology resources for biomolecular measurements (NIST MML).
Key advantages:
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Lower background in FcR-rich samples
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Improved signal-to-noise in membrane-dense or immune-cell preparations
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Flexible labeling downstream since the antibody is unconjugated
Typical Specifications (research use)
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Purity: affinity-purified; low aggregate content (check lot-specific COA)
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Format: liquid, buffered with stabilizers and preservative (see product label)
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Storage: short-term 2–8 °C; for long-term, aliquot and store frozen (avoid freeze–thaw). General storage best practices: NLM/NIH.
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Cross-reactivity: designed for hamster IgG; minimal cross-reactivity to other species is typical but must be verified empirically (review lot data). See assay design cautions at NIGMS/NIH (here) and NIST (here).
For organism background: NCBI Taxonomy (hamster taxonomy) and general vertebrate immunology primers via NCBI Bookshelf (methods & primers).
Application Guidance
ELISA (indirect format)
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Coat plates with antigen → block → add hamster primary IgG → wash → add Rbt Xhmstr IgG F(ab’)2 Uncnj → wash → add a labeled tertiary reagent if needed.
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Optimize dilution empirically (common secondary working ranges: 0.1–2 µg/mL).
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For assay fundamentals and plate handling: NCBI PMC methods, NLM resources.
Western blot
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Transfer protein → block → incubate with hamster primary → wash → incubate with Rbt anti-Hamster F(ab’)2 → detect with appropriate tertiary system.
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Reduce background using stringent washes and optimized blocking. See general method references at NCBI Bookshelf and reproducibility guidance at NIST.
IHC/IF (fixed samples)
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Permeabilize if intracellular targets; block with serum from the host of the secondary or dedicated blockers.
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Apply hamster primary, then F(ab’)2 secondary; detection via fluor-labeled tertiary reagent or polymer system.
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Tissue fixation and autofluorescence controls: NIBIB and Genome.gov.
Flow cytometry (research)
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F(ab’)2 fragments help reduce Fc-mediated binding. Include Fc-blocking and isotype controls where applicable. See general flow concepts at NIAID/NIH and open research primers via NCBI PMC.
Controls and Validation
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Negative control: omit primary hamster IgG.
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Isotype control: matched hamster isotype.
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Adsorption control: pre-incubate secondary with purified hamster IgG to confirm specificity.
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Titration: determine minimal secondary concentration delivering maximal specific signal.
For validation and rigor frameworks: NIH Rigor & Reproducibility, NIST measurement quality, and literature access via NCBI PMC.
Sample Buffering & Handling Tips
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Use PBS or TBS with 0.05–0.1% non-ionic detergent for washes.
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Avoid chelators or high redox reagents that could impact fragment integrity.
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Spin briefly before use to remove micro-aggregates.
Practical bench references: NCBI Bookshelf, NLM/NIH.
Troubleshooting Quick Chart
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High background: lower secondary concentration; extend washes; increase blocking stringency; ensure Fc-free secondary (F(ab’)2) is used.
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Weak signal: verify primary activity; adjust incubation time/temperature; confirm tertiary detection sensitivity.
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Non-specific bands (WB): increase wash stringency; optimize electrophoresis and transfer.
Methodological context: NCBI PMC, NIST MML.
Data Management & Documentation
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Record lot, dilution, incubation times, and buffers for reproducibility.
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Archive protocols and raw data following good data-management practices: NLM, NCBI.
SEO-Ready eCommerce Block
H1: Rbt Xhmstr IgG F(ab’)2 Unconjugated — Rabbit Anti-Hamster IgG Secondary Antibody (Fc-free)
Meta title (≤60 chars): Rabbit Anti-Hamster IgG F(ab’)2, Unconjugated | Secondary
Meta description (≤160 chars): Fc-free rabbit anti-hamster IgG F(ab’)2 secondary for ELISA, WB, IHC, IF, flow. Low background, high specificity. Research-use only.
Keywords cluster (sprinkle naturally): rabbit anti-hamster IgG, F(ab’)2 fragment, unconjugated secondary antibody, Fc-free secondary, hamster IgG detection, ELISA secondary, Western blot secondary, immunofluorescence secondary, IHC secondary, flow cytometry secondary, minimal background, affinity-purified, Mesocricetus auratus, research reagent, antibody fragment.
Alt-text ideas for images:
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“Rabbit anti-hamster IgG F(ab’)2 secondary antibody, unconjugated, vial on white background”
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“Workflow diagram using F(ab’)2 secondary to reduce Fc-mediated background”
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“ELISA plate readout optimized with F(ab’)2 secondary antibody”
Bullets for product page:
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Rabbit anti-hamster IgG F(ab’)2, unconjugated
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Fc-free to minimize non-specific Fc interactions
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Optimized for ELISA/WB/IHC/IF/flow in research settings
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Affinity-purified; consistent performance across lots (see COA)
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Flexible detection with user-selected tertiary labels
Reference Reading (.edu/.gov)
Use these as general knowledge bases and primers during method setup and data interpretation (not for clinical use):
Short Product Summary (for category pages)
Rbt Xhmstr IgG F(ab’)2 Unconjugated is a rabbit-polyclonal secondary antibody fragment specific for hamster IgG, supplied Fc-free to lower background in ELISA, Western blot, IHC/IF, and flow cytometry research assays. Affinity-purified with consistent performance; unconjugated format provides flexibility with tertiary detection systems.