About Us

Nebulabio is a dedicated biotechnology service provider specializing in precision antibody conjugation and labeling. Our core mission is to empower scientific discovery and diagnostic development by transforming your valuable antibodies into highly functional, labeled reagents without compromising their integrity or activity. We understand that antibody-based assays—from advanced multiplex imaging and high-parameter flow cytometry to sensitive diagnostic tests—demand reagents of the highest quality, consistency, and performance. Our team of conjugation experts combines deep knowledge of antibody chemistry with state-of-the-art instrumentation to offer a robust, reliable, and customizable labeling service. We handle every step with meticulous care, ensuring you receive a conjugate that delivers superior signal-to-noise ratio, batch-to-batch reproducibility, and guaranteed performance for your specific application.

☞Why Choose Nebulabio for Antibody Conjugation and Labeling?

Antibody Conjugation & labeling is a critical step where poor execution can lead to loss of affinity, aggregation, or inconsistent performance. Here’s why researchers trust us with their valuable antibodies:

• Expertise in Antibody-Specific Chemistry: We are not a generic labeling service. We understand the nuances of antibody structure and tailor the conjugation chemistry (e.g., lysine vs. cysteine residues) to your specific antibody isotype and intended use. Our scientists optimize reaction conditions to maximize the Degree of Labeling (DOL) while preserving antigen-binding activity.

• Uncompromising Commitment to Antibody Preservation: Your antibody is irreplaceable. Our proprietary protocols and purification methods are designed to maximize antibody recovery and minimize aggregation. We prioritize maintaining native conformation and biological function throughout the conjugation process.

• Rigorous Quality Control (QC) on Every Batch: We don't just deliver a labeled product; we deliver validated performance. Every conjugate undergoes mandatory QC, including:

1. Measurement of Degree of Labeling (DOL) via spectrophotometry.

2. Assessment of purity and aggregation by Size-Exclusion Chromatography (SEC-HPLC).

3. Functional validation via a binding assay (e.g., ELISA or flow cytometry) to confirm retained specificity and activity.

• Access to a Broad Portfolio of Novel Labels: Beyond standard fluorophores and enzymes, we offer conjugation to cutting-edge labels such as tandem dyes, DNA barcodes (for oligo-conjugated antibodies), metal chelators (for CyTOF®), and photoactivatable probes, enabling the most advanced applications.

• Confidential, Project-Based Partnership: We treat each project with complete confidentiality. You work directly with a project scientist who provides personalized consultation, transparent timelines, and a comprehensive final report with all characterization data.

☞Antibody Conjugation & Labeling Workflow

Nebulabio’s standardized yet adaptable workflow ensures precision and reliability from start to finish.

• Project Consultation & Strategy: We discuss your antibody, target antigen, desired label, and application. We recommend the optimal conjugation site (Fc region, Fab region, specific cysteine engineering) and chemistry.

• Antibody QC & Pre-processing: We analyze your provided antibody for concentration, purity, and aggregation. If necessary, we perform buffer exchange into an optimal conjugation buffer.

• Controlled Conjugation Reaction: The labeling reaction is performed under optimized conditions of pH, temperature, and molar ratio. We use high-purity, activated label derivatives to ensure efficient and specific coupling.

• Purification & Buffer Exchange: The reaction mixture is rigorously purified to remove unconjugated dye, quenching agents, and byproducts. We use techniques such as size-exclusion chromatography (SEC) or membrane filtration, followed by buffer exchange into your specified storage buffer.

• Comprehensive Quality Control: The final conjugate is characterized as described above (DOL, purity, functionality). Performance data is compared to an unlabeled control.

• Delivery & Support: The finished, QC-verified conjugate is shipped along with a detailed Certificate of Analysis. We provide ongoing technical support for assay implementation.

Figure1.Site-specific labeling of IgG antibodies.

☞Our Extensive Antibody Conjugation Portfolio & Service Process

We offer conjugation to a vast array of labels to meet every research and diagnostic need:

• Fluorophores: Standard dyes (FITC, Alexa Fluor® 488, PE, APC, Cy®3, Cy5, Alexa Fluor® 647). Tandem dyes (PE-Cy7, APC-Cy7, Brilliant Violet™ & Ultralight™ polymers). Near-IR dyes (Alexa Fluor® 750, Cy7).

• Enzymes: Horseradish Peroxidase (HRP), Alkaline Phosphatase (AP), Beta-Galactosidase.

• Biotin & Streptavidin: Biotinylation with various spacers (PEG, long-chain).

• Small Molecules & Drugs: Conjugation for Antibody-Drug Conjugates (ADC) research (e.g., MMAE, DM1, fluorescent toxins).

Specialty Tags: DNA Oligonucleotides (for CITE-seq, AbSeq, etc.), Metal Isotope Chelators (for Mass Cytometry), Unique click chemistry handles (DBCO, Azide), Unnatural amino acids.

☞Applications of Antibody Labeling

High-quality labeled antibodies are fundamental to modern life sciences:

• Flow Cytometry & Spectral Flow: Multiplexed cell surface and intracellular staining using antibodies conjugated to a wide spectrum of fluorophores and Brilliant polymer dyes for deep immunophenotyping.

• Immunofluorescence & Confocal Microscopy: Creating bright, photostable conjugates (e.g., Alexa Fluor® dyes) for high-resolution cellular and tissue imaging, including super-resolution techniques.

• Immunohistochemistry (IHC): Providing HRP- or AP-conjugated antibodies for chromogenic detection, and fluorescent conjugates for multiplex immunofluorescence (mIF) assays.

• Diagnostic Assay Development: Supplying optimized HRP/AP conjugates for ELISA, biotinylated antibodies for sandwich assays, and rapid test conjugates for lateral flow devices.

• Western Blotting: Delivering highly sensitive IR-dye (700/800 nm) conjugated secondary antibodies for quantitative, multiplexed Western blot detection.

• Advanced Research Applications:

1. Spatial Biology & Multiomics: DNA-barcoded antibodies for platforms like GeoMx® DSP or 10x Genomics Visium.

2. Mass Cytometry (CyTOF®): Antibodies conjugated with rare-earth metal chelators.

3. Biosensor & Microarray Development: Site-specific labeling for immobilization or signal generation.

4. Antibody-Drug Conjugate (ADC) Research: Providing critical intermediates for linker-payload conjugation and in vitro evaluation.

By partnering with Nebulabio’s Custom Antibody Labeling Service, you gain more than just a conjugated antibody; you gain a critical reagent engineered for success, backed by scientific expertise and a commitment to quality that elevates your research.