The antibody’s specificity has been rigorously validated:
Immunoelectrophoresis: Shows a single precipitin arc against human IgG Fc but no reaction with human IgG Fab fragments .
ELISA Sensitivity: Detects human IgG at concentrations as low as 0.7 ng/mL .
Western Blot: Compatible with chemiluminescent substrates for high sensitivity (e.g., femtomolar detection limits) .
This antibody is versatile across multiple assay formats:
High Specificity: No cross-reactivity with non-human IgG or light chains .
Signal Amplification: HRP enables catalytic signal enhancement via chromogenic (e.g., TMB) or chemiluminescent substrates .
Stability: Retains activity for ≥1 year at -20°C when properly stored .
Low Background: Fc-specific binding minimizes nonspecific interactions in assays involving protein A/G or cellular Fc receptors .
Reconstitution: Lyophilized formulations require restoration with deionized water (avoid sodium azide, which inhibits HRP) .
Buffer Compatibility: Stable in PBS (pH 7.2–7.4) but incompatible with Tris-based buffers at alkaline pH .
Lot Consistency: Rigid quality control ensures inter-lot reproducibility for quantitative assays .
Data from independent studies highlight its reliability:
Rabbit anti-Human IgG Fc Antibody;HRP conjugated is a secondary antibody produced in rabbits that specifically recognizes and binds to the Fc portion of human IgG. This antibody is conjugated to horseradish peroxidase (HRP), an enzyme that catalyzes colorimetric, chemiluminescent, or fluorescent reactions when appropriate substrates are added. The conjugation allows for signal amplification in various immunoassay formats.
The antibody functions through specific recognition of the heavy chains on human IgG based on immunoelectrophoresis, without cross-reactivity to the light chains on human immunoglobulins or non-immunoglobulin human serum proteins . In immunoassays, this secondary antibody binds to the constant region (Fc) of primary human antibodies, enabling detection through the HRP enzyme activity. This system provides greater sensitivity through signal amplification as multiple secondary antibodies can bind to a single primary antibody .
Rabbit anti-Human IgG Fc Antibody;HRP conjugated finds applications in multiple immunological techniques:
Western Blotting: Typically used at dilutions of 1:1000 - 1:5000
Immunohistochemistry: Applied at dilutions of 1:500 - 1:2500
Immunoperoxidase electron microscopy
Other peroxidase-antibody based enzymatic assays requiring lot-to-lot consistency
The antibody is particularly valuable in research involving human antibody detection, human IgG subclass identification, and studies examining human immune responses where detection of the Fc region specifically (not the F(ab) region) is required .
Rabbit anti-Human IgG Fc Antibody;HRP conjugated is distinguished by several key characteristics:
Specificity: Targets only the Fc region of human IgG with no reaction observed against Human IgG F(ab)
Host species: Produced in rabbits, providing different binding properties compared to mouse or goat-derived alternatives
Preparation method: Typically prepared from monospecific antiserum by immunoaffinity chromatography using Human IgG coupled to agarose beads
Reactivity profile: When assayed by immunoelectrophoresis, results in a single precipitin arc against anti-Peroxidase, anti-Rabbit Serum, Human IgG, Human IgG F(c) and Human Serum
This antibody provides researchers with high specificity for human IgG Fc regions, making it particularly valuable in experimental designs where distinguishing between different regions of human antibodies is necessary.
Proper storage and reconstitution are critical for maintaining antibody activity and performance:
For long-term storage after reconstitution, dilute the antibody solution with glycerol to a final concentration of 50% glycerol and store as liquid at -20°C
For lyophilized product, add the appropriate volume of sterile water as specified in the Certificate of Analysis (typically around 0.55 ml)
Allow complete dissolution before use
For glycerol addition: If reconstituted at 1 mg in 1.1 ml of sterile water, add 1.1 ml of glycerol for 50% final glycerol concentration
Centrifuge product if not completely clear after standing at room temperature
Prepare working dilutions immediately prior to use and discard unused portion
Important note: Never add sodium azide as a preservative, as it irreversibly inhibits HRP enzyme activity .
The determination of optimal working dilutions for Rabbit anti-Human IgG Fc Antibody;HRP conjugated should be done experimentally for each specific application:
Perform a series of 2-3 fold dilutions of the antibody
Test against a known positive control
Create a titration curve as demonstrated in the ELISA results where starting dilution was 5μg/ml with 3-fold dilutions
Define the IC50 (the antibody concentration giving 50% of maximum signal) as the titer
Select a working dilution that provides optimal signal-to-noise ratio for your specific application
The optimal working dilution ultimately depends on the detection method, substrate used, and sensitivity requirements of the particular experiment.
The choice of blocking reagents and buffer systems significantly impacts the performance of Rabbit anti-Human IgG Fc Antibody;HRP conjugated:
3% fish gelatin has been demonstrated effective for ELISA applications
1-5% BSA (bovine serum albumin) in appropriate buffer
Commercial blocking reagents formulated for HRP-conjugated antibodies
PBS (Phosphate Buffered Saline), pH 7.4
TBS (Tris Buffered Saline)
The antibody is typically supplied in 10 mM Sodium Phosphate, 0.15 M Sodium Chloride, pH 7.2, with stabilizers
Ensure blocking reagents do not contain interfering substances
When using the antibody for detecting human proteins in human samples, consider using species-specific blocking reagents to reduce background
0.1% (v/v) of Kathon CG is sometimes used as preservative instead of sodium azide
TMB (3,3',5,5'-Tetramethylbenzidine) is commonly used as a substrate for HRP in ELISA applications
Experimental optimization is recommended as different applications and sample types may require adjustment of these parameters.
The specificity of Rabbit anti-Human IgG Fc Antibody;HRP conjugated is critical for experimental reliability and is validated through multiple analytical methods:
Specifically targets the Fc region (two heavy chains with constant domains) of human IgG
No cross-reactivity with light chains on human immunoglobulins or non-immunoglobulin human serum proteins
Immunoelectrophoresis: Results in a single precipitin arc against anti-Peroxidase, anti-Rabbit Serum, Human IgG, Human IgG F(c) and Human Serum
ELISA: Validated through titration against purified Human IgG F(c), showing high specificity and appropriate dose-response curve
Immunoaffinity purification: The antibody is typically prepared by immunoaffinity chromatography using Human IgG coupled to agarose beads, ensuring specific targeting
Western blot analysis: Demonstrated through specific detection of human IgG in various lysates
Validation data typically shows a clean single band at the expected molecular weight (approximately 50kDa) for the IgG heavy chain when used in Western blot applications .
Managing potential cross-reactivity with other species' immunoglobulins requires careful experimental design:
Pre-absorption: Some commercial antibodies are specifically absorbed against solid phase normal bovine, mouse and rabbit serum proteins to minimize cross-reactivity
Blocking with heterologous serum: Include serum from the potentially cross-reactive species in blocking buffers
Dilution optimization: Determine the minimum antibody concentration that provides sufficient signal while minimizing cross-reactivity
Alternative antibody selection: Consider F(ab')2 fragments which may exhibit reduced cross-reactivity in certain applications
Negative control testing: Run parallel experiments with samples lacking human IgG to identify any non-specific binding
When working with samples containing mixed species immunoglobulins (e.g., human antibodies produced in mouse hybridoma systems), use antibodies specifically verified not to react with the non-target species
For complex biological samples, consider additional purification steps prior to immunodetection
Validate the absence of cross-reactivity empirically for each new experimental system
Rabbit anti-Human IgG Fc Antibody;HRP conjugated can be effectively integrated into multiplex immunoassay platforms:
Combinatorial detection systems: HRP can be paired with other enzyme conjugates (alkaline phosphatase, beta-galactosidase) that utilize different substrates, enabling multiple target detection
Bead-based multiplexing: The antibody can be used in Luminex or similar bead-based platforms where the HRP signal is coordinated with bead identification
Microarray applications: For high-throughput screening of multiple human antibody specificities simultaneously
Sequential detection: Multiple rounds of probing, signal development, and stripping for iterative detection
Ensure substrate selection provides appropriate signal separation when multiple HRP-conjugated antibodies are used
Consider differential dilution of antibodies to achieve comparable signal intensity across targets
Implement appropriate controls to evaluate potential cross-talk between detection systems
For quantitative applications, develop standard curves for each analyte in the multiplex system
The antibody has been successfully employed in experiments demonstrating binding between immobilized human TNF-alpha protein and human monoclonal anti-TNF-alpha antibody, with detection facilitated by HRP conjugated anti-human IgG Fc antibody at a 1:10000 dilution (0.0842μg/ml) .
Optimizing signal-to-noise ratios is essential when working with complex biological samples:
Amplification systems: Implement tyramide signal amplification (TSA) or other HRP-compatible amplification methods
Substrate selection: Choose high-sensitivity substrates like enhanced chemiluminescence (ECL) reagents
Incubation optimization: Extended substrate incubation times at controlled temperatures
Concentration optimization: Titrate both primary and secondary antibodies to find optimal working concentrations
Extensive blocking: Use multi-component blocking systems (BSA plus normal serum)
Sample pre-treatment: Implement pre-absorption steps to remove interfering substances
Buffer optimization: Include detergents (0.05-0.1% Tween-20) and carrier proteins in wash buffers
Two-step detection: Biotinylated primary antibody followed by HRP-conjugated streptavidin can sometimes provide cleaner results than direct secondary antibody detection
Experimental validation:
In Western blot analysis, this antibody has demonstrated effective detection at dilutions ranging from 1:4000 to 1:32000 using ECL detection with 30-second exposure times, demonstrating high sensitivity with minimal background .
Rabbit anti-Human IgG Fc Antibody;HRP conjugated plays a crucial role in therapeutic antibody development and characterization:
Manufacturing quality control: Verification of human IgG Fc integrity in produced batches
Structural analysis: Confirmation of proper folding and accessibility of Fc regions
Functional assessment: Evaluation of Fc-mediated effector functions through binding assays
Post-translational modification analysis: Detection of glycosylation patterns on the Fc region
Stability studies: Monitoring potential degradation of Fc structures during storage
Fusion protein detection: For Fc-tagged recombinant proteins, enabling specific detection
Expression level quantification: Through calibrated ELISA systems using purified human IgG standards
Purification verification: Confirmation of successful purification of Fc-containing proteins
Binding kinetics assessment: In surface plasmon resonance or bio-layer interferometry where Fc-specific detection is required
Case example:
Research has demonstrated the application of this antibody type in characterizing human monoclonal anti-TNF-alpha antibodies. In one documented assay, immobilized Human TNF-alpha Protein (His Tag) at 2 μg/mL could bind Human Monoclonal Anti-TNF-alpha antibody (Human IgG1), with detection facilitated by HRP conjugated Anti-Human-IgG-Fc Antibody diluted at 1:10000 (0.0842 μg/ml) . This application showcases the utility of these antibodies in characterizing therapeutic antibody candidates.
Researchers may encounter several challenges when using this antibody:
Issue | Possible Causes | Resolution Strategies |
---|---|---|
High background | Insufficient blocking, excessive antibody concentration | Optimize blocking conditions, increase blocking time, further dilute antibody |
Weak or no signal | Inactive HRP, improper storage, excessive dilution | Use fresh antibody preparation, optimize dilution, ensure proper storage, avoid sodium azide |
Non-specific bands | Cross-reactivity, sample degradation | Increase antibody specificity through dilution, improve sample preparation, use freshly prepared samples |
Variable results | Lot-to-lot variability, inconsistent handling | Standardize protocols, validate each new lot, maintain consistent experimental conditions |
Rapid signal fading | Improper substrate handling, light exposure | Prepare fresh substrate, protect from light, optimize image acquisition timing |
Never add sodium azide as a preservative as it inhibits HRP irreversibly
Protect from light and avoid repeated freeze-thaw cycles to maintain enzyme activity
For long-term storage after reconstitution, dilute with glycerol to 50% final concentration and store at -20°C
Centrifuge the product if not completely clear after standing at room temperature
The choice of detection substrate significantly impacts sensitivity, dynamic range, and stability:
Substrate Type | Sensitivity | Signal Duration | Applications | Considerations |
---|---|---|---|---|
TMB (3,3',5,5'-Tetramethylbenzidine) | Moderate-High | Stable for minutes to hours | ELISA | Can be stopped with acid for endpoint reading, blue to yellow color change |
DAB (3,3'-Diaminobenzidine) | Moderate | Permanent | IHC, blotting | Forms brown precipitate, not suitable for multiplexing |
ECL (Enhanced Chemiluminescence) | Very High | Transient (minutes) | Western blot | Requires specialized detection equipment, excellent for low abundance targets |
ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)) | Moderate | Stable for hours | ELISA | Green color development, good for quantitative assays |
AEC (3-amino-9-ethylcarbazole) | Moderate | Semi-permanent | IHC | Red precipitate, alcohol-soluble (aqueous mounting required) |
For highest sensitivity detection, ECL substrates with Rabbit anti-Human IgG Fc Antibody;HRP conjugated have demonstrated effective results with exposure times as short as 30 seconds
For ELISA applications, TMB substrate has been validated with this antibody type in titration experiments
Match substrate sensitivity to expected target abundance - use high-sensitivity substrates for low abundance targets
Consider signal stability requirements - some applications may require stable signal for extended imaging or documentation
Recent advancements in conjugation chemistry have enhanced the performance characteristics of these antibodies:
Site-specific conjugation: Rather than random lysine-based conjugation, site-specific attachment of HRP to the antibody maintains consistent orientation and preserves binding sites
Controlled conjugation ratios: Optimized enzyme-to-antibody ratios to maximize sensitivity without compromising specificity
Enhanced HRP stability: Modified HRP enzymes with improved resistance to inactivation and longer shelf-life
Polymer-based signal amplification: HRP polymers attached to each antibody molecule increase signal output per binding event
Bifunctional linker chemistry: Advanced linkers that maintain both antibody and enzyme activities while improving conjugate stability
Lower background through reduced non-specific binding
Improved lot-to-lot consistency through controlled conjugation processes
Extended shelf-life and stability under various storage conditions
Enhanced sensitivity allowing detection of lower target concentrations
Better signal-to-noise ratios in complex biological samples
Researchers should consider these advancements when selecting specific products for critical applications, particularly when high sensitivity or reproducibility is required.
Rabbit anti-Human IgG Fc Antibody;HRP conjugated serves as a critical reagent in studies involving transgenic animals expressing human immunoglobulins:
Humanized antibody model validation: Verification of human IgG expression in transgenic rabbit models developed for therapeutic antibody production
B-cell compartment characterization: Analysis of human antibody-expressing B cells in transgenic models through flow cytometry and immunohistochemistry
Immune repertoire analysis: Assessment of human antibody repertoire development in transgenic animals
Differentiation of endogenous versus transgenic antibodies: Specific detection of human IgG Fc in the presence of host animal immunoglobulins
Relevant research findings:
Recent advances have produced transgenic rabbits incorporating human immunoglobulin genes that recapitulate the B-cell developmental pathway. These models also incorporate human CD79a/b and Bcl2 genes, which enhance B-cell receptor expression and B-cell survival . Following immunization against specific targets such as BMP9 (Bone Morphogenetic Protein 9), researchers have isolated highly affine and specific neutralizing antibodies from these rabbits .
The analysis of B-cell populations in these transgenic rabbits revealed that only ~0.1 to 0.7% of peripheral blood mononuclear cells (PBMCs) stained positive for rabbit IgM, confirming the knockout of endogenous rabbit IgM. The transgenic rabbits demonstrated ~8-18% B cells positive for human IgM, with distinct populations of B-cells displaying cell surface IgG . Rabbit anti-Human IgG Fc Antibody;HRP conjugated would be instrumental in specifically detecting and characterizing the human antibody-expressing cells in such models.
Development of diagnostic immunoassays utilizing Rabbit anti-Human IgG Fc Antibody;HRP conjugated involves several specialized considerations:
Standardization and calibration: Establishing consistent reference standards for quantitative assays
Sensitivity requirements: Determining minimum detection thresholds required for clinical relevance
Specificity validation: Comprehensive cross-reactivity testing against potential interfering substances
Sample matrix effects: Evaluation of performance in various clinical matrices (serum, plasma, other bodily fluids)
Stability testing: Assessment of reagent stability under various storage and handling conditions
Blocking optimization to minimize background in clinical samples
Dilution protocol development to address high-concentration hook effects
Signal development kinetics characterization for optimal reading timepoints
Calibration curve modeling for accurate quantification
Performance specifications:
Rabbit anti-Human IgG Fc Antibody;HRP conjugated has demonstrated effectiveness in ELISA applications with recommended dilutions ranging from 1:5000-1:50000 , providing the sensitivity required for many diagnostic applications. The antibody's specific targeting of the Fc region without cross-reactivity to F(ab) fragments makes it particularly valuable for assays where specific detection of intact human IgG is required, as opposed to antibody fragments.
Rabbit anti-Human IgG Fc Antibody;HRP conjugated provides valuable tools for investigating Fc receptor interactions and functions:
Binding competition assays: Evaluating whether the antibody competes with Fc receptors for binding to the Fc region
Structural studies: Investigating which Fc epitopes remain accessible after Fc receptor binding
Post-translational modification analysis: Assessing how glycosylation or other modifications affect Fc receptor interactions
Therapeutic antibody engineering: Screening modified Fc regions for altered receptor binding properties
Immune complex characterization: Detecting Fc exposure in various immune complex formations
Sandwich ELISA systems where Fc receptors are used as capture molecules and Rabbit anti-Human IgG Fc Antibody;HRP conjugated as detection
Flow cytometry applications detecting cell-bound human IgG through Fc recognition
Immunoprecipitation of Fc receptor-antibody complexes with subsequent analysis
Competitive binding assays to map the relationship between antibody binding sites and Fc receptor contact points
Experimental design considerations:
When designing experiments to study Fc receptor biology, researchers should carefully evaluate whether the epitope recognized by the Rabbit anti-Human IgG Fc Antibody overlaps with Fc receptor binding sites, as this could potentially interfere with natural receptor-Fc interactions. Epitope mapping or competitive binding studies may be necessary to characterize these relationships for specific experimental systems.
Different host species produce anti-Human IgG Fc antibodies with distinct characteristics:
Host Species | Advantages | Limitations | Optimal Applications |
---|---|---|---|
Rabbit | High affinity and specificity, robust signal, good stability | Potential cross-reactivity with rabbit primary antibodies | General detection in most immunoassay formats |
Goat | Low background in many mammalian tissues, broad reactivity | Variable lot-to-lot consistency | IHC applications, especially in rabbit tissues |
Mouse | Highly consistent monoclonal options available, defined epitope recognition | May cross-react in mouse tissue samples | Applications requiring epitope specificity |
Chicken | Minimal cross-reactivity with mammalian proteins | Less common, potentially more expensive | Applications with high risk of mammalian cross-reactivity |
Rabbit-derived antibodies often demonstrate superior affinity compared to other species
Goat anti-Human IgG Fc antibodies may offer reduced background in certain tissue types
Mouse monoclonal anti-Human IgG Fc antibodies provide consistent lot-to-lot reproducibility and defined epitope targeting
The hybridoma-derived mouse monoclonal antibody (clone 6F11C8) offers highly specific recognition of human IgG Fc with minimal cross-reactivity
Selection guidance:
Choose host species based on experimental design, considering:
Sample tissue origin (avoid same species as sample)
Primary antibody species (avoid same species as primary)
Required specificity (monoclonal vs. polyclonal)
Application sensitivity requirements
The choice between F(ab')2 fragments and whole IgG formats involves important trade-offs:
Reduced non-specific binding through elimination of the Fc region
Minimized cross-reactivity with Fc receptors present in samples
Smaller size allowing better tissue penetration in IHC applications
Reduced background in samples containing rheumatoid factor or other anti-Fc antibodies
Advantageous when detecting antibodies in the presence of Fc receptors
Generally higher stability and longer shelf-life
Typically more economical to produce
Higher avidity through bivalent binding plus potential Fc interactions
May provide stronger signal in certain applications
Better retention during stringent washing steps
For samples from patients with autoimmune conditions, F(ab')2 fragments may reduce interference from rheumatoid factors
In flow cytometry applications, F(ab')2 fragments may reduce non-specific binding to Fc receptors on immune cells
For standard ELISA and Western blot applications, whole IgG formats often provide sufficient specificity with stronger signal
Some commercial products, like Goat anti-Human IgG Fc, F(ab)'2 fragment, HRP conjugated, are specifically designed to minimize cross-reactivity with bovine, mouse, and rabbit serum proteins
Various detection strategies offer different performance characteristics:
Detection Method | Sensitivity | Signal Stability | Complexity | Best Applications |
---|---|---|---|---|
Direct HRP detection | Moderate | Stable (substrate dependent) | Low | Routine Western blots, standard ELISA |
Biotin-streptavidin amplification | High | Stable | Moderate | Low abundance targets, difficult samples |
Tyramide signal amplification (TSA) | Very high | Permanent | High | Extremely low abundance targets, IHC |
Polymer-HRP systems | High | Stable | Low-moderate | IHC, sensitive Western blots |
Quantum dot conjugation | High | Very stable | Moderate | Multiplexing, long-term imaging |
Sensitivity thresholds: TSA systems can provide 10-100x signal amplification compared to direct HRP detection
Signal-to-noise considerations: Amplification systems may increase both signal and background proportionally
Protocol complexity: Direct detection offers simplest workflows, while TSA requires multiple additional steps
Cost implications: Direct HRP detection is typically most economical; amplification systems increase reagent costs
For routine detection of abundant targets, direct HRP detection using Rabbit anti-Human IgG Fc Antibody;HRP conjugated at recommended dilutions (1:1000-1:5000 for Western blots, 1:5000-1:10000 for ELISA) provides sufficient sensitivity
For challenging samples or low abundance targets, consider biotin-streptavidin systems or polymer-HRP approaches
When extreme sensitivity is required, implement TSA systems with optimized Rabbit anti-Human IgG Fc Antibody;HRP conjugated as the initial detection antibody
Several cutting-edge research fields are driving new applications for these antibodies:
Single-cell antibody secretion assays: Detecting antibody production at the individual cell level
Microfluidic immunoassay platforms: Integration into lab-on-chip devices for point-of-care diagnostics
Bispecific antibody characterization: Analyzing novel therapeutic antibody formats with engineered Fc regions
Nanobody and alternative scaffold detection: When these constructs incorporate human Fc regions
CAR-T cell therapy monitoring: Detecting soluble targets bound by engineered receptors containing Fc regions
Tissue-resident antibody research: Localizing human antibodies in tissue microenvironments
Advances in microscale detection systems allowing single-molecule sensitivity
Integration with automated high-throughput screening platforms
Combination with digital PCR and other molecular methods for correlative analysis
Development of rabbit models with humanized antibody repertoires for therapeutic antibody discovery
These emerging applications continue to expand the utility of Rabbit anti-Human IgG Fc Antibody;HRP conjugated beyond traditional immunoassays into new frontiers of biomedical research.
Ongoing technological developments promise to further expand applications:
Multimodal detection: Dual-labeled antibodies combining HRP with fluorescent or other detection modalities
Enhanced enzyme variants: Engineered HRP variants with improved stability, catalytic efficiency, or substrate specificity
Machine learning integration: Automated image analysis tools for quantitative interpretation of complex staining patterns
Microfluidic integration: Incorporation into automated, miniaturized immunoassay platforms
Novel immobilization strategies: Surface chemistry innovations for improved antibody orientation and accessibility
Improved recombinant production: Transition from traditional immunization to recombinant production for enhanced consistency
Integration with synthetic biology approaches for custom antibody engineering
Combination with CRISPR-modified cellular systems for functional genomics
Implementation in point-of-care and resource-limited diagnostic platforms
Development of activity-based rather than abundance-based detection systems
These advances will continue to expand the versatility and utility of Rabbit anti-Human IgG Fc Antibody;HRP conjugated in both basic research and applied biomedical sciences.
Ensuring reproducible results requires attention to several key quality control parameters:
Specificity validation: Comprehensive cross-reactivity testing against non-target immunoglobulins and serum proteins
Sensitivity assessment: Limit of detection determination under standardized conditions
Lot-to-lot consistency: Comparison testing between manufacturing lots
Enzyme activity stability: Monitoring HRP activity retention over time and under various storage conditions
Functional validation: Application-specific performance testing rather than just binding assays
Maintain detailed records of antibody lot numbers, dilutions, and performance characteristics
Include consistent positive and negative controls in each experiment
Establish internal reference standards for quantitative applications
Validate each new lot before implementing in established protocols
Store antibody aliquots rather than repeatedly accessing stock solutions
Record reconstitution dates and conditions
Document storage temperature and handling procedures
Maintain calibration curves for quantitative applications
Archive representative results from each antibody lot for comparison
Implement standardized reporting formats to facilitate cross-experimental comparison