Biotin Custom Conjugation
Venom-Derived Toxins (peptides) / Growth Factors (proteins)
Sometimes the exact tool you need isn’t in the catalog. We offer professional custom peptide and protein biotinylating services. Our biotin conjugates enable high-affinity capture and detection in streptavidin-based systems, including western blotting, ELISA, and pull-down assays. Directly biotinylated reagents streamline your experimental setup and provide a reliable, stable handle for diverse functional assays.
Advantages of Custom Conjugation Service
Customization
Tailored precisely to your specific requirements.
High Sensitivity
Ideal for the detection of low-abundance targets.
Signal Amplification
Enables multi-layer detection strategies for significantly enhance dsignal output.
Scalability & Stability
Bulk sizes and progressive pricing are available for large-scale orders. Shipped as a stable, lyophilized powder to ensure long-term performance.
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Uses & Applications
Our custom conjugation services support a wide range of research applications, enabling highly sensitive and reproducible results. These biotinylated conjugates are optimized for signal amplification and target enrichment, leveraging the high-affinity biotin-streptavidin system to detect or capture targets in complex biological environments.
Biotin-Based Detection
Biotinylated toxins and growth factors allow for ultra-sensitive visualization of targets through streptavidin-mediated signal amplification.
Western Blot & Blot-Based Assays
Biotinylated proteins enable high-sensitivity detection in western blots using streptavidin-HRP or fluorescent conjugates.
ELISA
Biotinylated toxins and growth factors support sensitive and reproducible ELISA-based detection.
Multiplex Immunodetection
Simultaneous multi-target detection using spectrally distinct fluorophore, enzyme, or biotin conjugation for multiplex assays.
Flow Cytometry & Imaging Flow Cytometry
Custom-labeled conjugates support flow cytometry panel designand robust multiplex analysis of surface markers, leveraging streptavidin-based amplification for high-sensitivity detection oflow-abundance targets.
Pull-Down & Capture Assays
Biotinylated toxins and growth factors support streptavidin-based pull-down and protein interaction studies.
In Vivo
Custom conjugation allows tailored labeling for selected in vivo studies, improving consistency and signal quality.
Tissue Clearing
Optimized labeling strategies for tissue clearing, improving signal penetration and image clarity.
Biotin Conjugation Service Specifications
Validated Materials
Conjugation is performed using our toxins or proteins, which undergo HPLC, MS, and bioactivity validation before labeling.
Targeted Conjugation
We use NHS-ester reagents to covalently attach biotin to primary amine groups (e.g., N-terminus or Lysine residues).
Purification
We remove all free biotin and determine the extent of labeling (amount of biotin molecules per toxin/protein molecule).
Extended Testing
Extended bioassay testing by FACS, live-cell imaging, or fluorescence microscopy (e.g., for frozen section staining) is possible upon request.
Final Validation
The final product is fully characterized by HPLC, MS analysis, and biological activity assays. (Biological activity assay eliminates non-active conjugates).
Service Notes
Minimum order: 5 × 10 µg.
Spacer Arms: We use a standard 22.4 Å intermediate spacer to balance reduced steric hindrance with modest molecular mass, ensuring optimal streptavidin binding. Custom tags available upon request.
Biotinylation Service Specifications
This biotin labeling service includes:
Validated Materials: Conjugation is performed using our toxins or proteins, which undergo HPLC, MS, and bioactivity validation before labeling.
Targeted Conjugation: We use NHS-ester reagents to covalently attach biotin to primary amine groups (e.g., N-terminus or Lysine residues).
Purification: We remove all free biotin and determine the extent of labeling (amount of biotin molecules per toxin/protein molecule).
Final Validation: The final product is fully characterized by HPLC, MS analysis, and biological activity assays (Biological activity assay eliminates non-active conjugates).
Extended Testing: Extended bioassay testing by FACS, live-cell imaging, or fluorescence microscopy (e.g., for frozen section staining) is possible upon request.
Service Notes:
Minimum order: 5 × 10 µg.
Spacer Arms: Depending on your planned assay, the optimal biotin tag may vary. Unless otherwise specified, we utilize an intermediate-length spacer arm (22.4 Å). This provides an ideal balance between reducing steric hindrance for streptavidin binding and maintaining a modest molecular mass.
| Conjugate Type | Excitation (nm) | Emission (nm) | Emission Color | Recommended Lasers (nm) |
| Fluorescent Conjugates | ||||
| mFluor Violet™ 450 | 407 | 455 |
Violet / Blue
|
405 |
| FITC | 494 | 518 |
Green
|
488 |
| ATTO Fluor-488 | 500 | 520 |
Green
|
561 |
| ATTO Fluor-550 | 554 | 578 |
Yellow-Orange
|
561 |
| R-PE | 561 | 578 |
Orange
|
561 |
| ATTO Fluor-590 | 593 | 622 |
Orange-Red
|
561 |
| ATTO Fluor-594 | 603 | 626 |
Orange-Red
|
561 |
| ATTO Fluor-633 | 630 | 651 |
Red
|
640 |
| APC | 633-640 | 660 |
Red
|
640 |
| ATTO Fluor-647N | 646 | 664 |
Far-Red
|
640 |
| iFluor® 800 | 801 | 820 |
Near-Infrared
|
785/808 |
| Non-Fluorescent Conjugates | ||||
| Biotin | - | - | - | - |
| HRP | - | - | - | - |
| Alkaline Phosphatase | - | - | - | - |
Data Highlights
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Get Your Custom Quote
Validated conjugation to fluorophores, enzymes, or biotin for antibodies and toxins, with flexible quantities,
bulk pricing, and lot reservation tailored to your needs.
FAQs
View all FAQs >
If you can’t find the answer, please contact us.
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The DOL indicates the average number of dye or biotin molecules attached to each conjugated molecule. The specific number of dye or biotin molecules attached to each product is provided on the relevant product webpage in the Specifications section, under the “Label” entry.
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Yes, each conjugated venom toxin is carefully evaluated to confirm that its biological activity is preserved after conjugation. We perform electrophysiological testing using either Xenopus oocytes or mammalian cells expressing the relevant protein targets. The activity of the conjugated toxin is then directly compared with that of the corresponding unconjugated (native) toxin. This comparative analysis allows us to verify that the conjugation process does not compromise the toxin’s functional activity or its ability to interact with the target protein. Detailed assay descriptions are available on the relevant product webpage.
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Conjugated venom toxins are most suitable for live imaging applications. Conjugated venom toxins are superior probes for live-cell imaging of their protein targets, due to their small size, high affinity, and ability to bind native extracellular targets. Unlike antibodies, they have evolved to target the native, functional states of these targets with minimal non-specific binding. In contrast, while conjugated antibodies are more versatile, they are often less optimal for studying target protein dynamics in some living cells due to the internalization of the antibody-antigen complex.
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Yes. Detailed protocols are available online to support the optimal use of conjugated toxins across various applications. Please refer to our protocols here: Live imaging, Flow cytometry, Immunofluorescence, and Multiplex Immunodetection.
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The biological activity of the conjugated neurotrophin is always directly compared to that of the corresponding unconjugated (native) neurotrophin. This side-by-side comparison allows us to confirm that the conjugation process does not significantly affect receptor binding, signaling capability, or functional activity. Only bioactive conjugated neurotrophins are commercialized.
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Yes. Detailed protocols are available online to support the optimal use of conjugated neurotrophins across various applications. Please refer to our protocols here: Immunofluorescence, Flow cytometry, and Live imaging.
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Standard laboratory safety precautions are generally sufficient when handling venom toxins. Appropriate personal protective equipment (PPE), such as a lab coat and nitrile gloves, should be worn at all times. However, users should always consult the specific Safety Data Sheet (SDS) for each venom toxin to review any particular hazards and recommended handling procedures.