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Functionalized Oligonucleotide Synthesis

Bio-Synthesis provides functionalized oligonucleotide synthesis services for DNA, RNA, and modified oligos used in detection, imaging, affinity capture, immobilization, conjugation, biosensor development, and advanced molecular assay workflows.

Fluorescent labeled oligos Dual-labeled probes Biotinylated oligos Click-ready oligos Amino-modified oligos Thiol-modified oligos Cross-linker modified oligos
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Overview Functionalized types Comparison Applications Workflow Design support Why Bio-Synthesis FAQ Contact

Overview

Functionalized oligonucleotides are chemically modified DNA or RNA molecules designed to introduce specific labels, affinity tags, reactive handles, or crosslinking groups. These modifications allow oligos to do more than hybridize to a complementary sequence; they can report signal, bind surfaces, capture targets, link to biomolecules, or participate in controlled conjugation reactions.

Functionalized oligonucleotides including fluorescent, dual-labeled, biotinylated, click-ready, amino, thiol, and cross-linker modified oligos

Overview of functionalized oligonucleotide modifications including fluorescent labels, biotin, click chemistry, amino, thiol, and cross-linker functional groups.

Bio-Synthesis supports a broad range of functionalized oligo synthesis options, including fluorescent labeled oligos, dual-labeled oligos, biotinylated oligos, click-ready oligos, amino-modified oligos, thiol-modified oligos, and cross-linker modified oligos.

These oligos are commonly used in qPCR probes, FISH, molecular beacons, pull-down assays, streptavidin capture, nanoparticle attachment, biosensor design, surface immobilization, targeted conjugation, interaction studies, and diagnostic assay development.

What is a functionalized oligonucleotide?
A functionalized oligonucleotide is a DNA or RNA oligo modified with a chemical group that provides a specific function such as fluorescence, affinity capture, covalent coupling, surface attachment, click chemistry reactivity, or crosslinking.

Functional oligo design platform

Label • Capture • Conjugate

Functionalized oligos convert sequence-specific recognition into measurable signal, affinity capture, molecular attachment, or downstream conjugation.

Detection

Fluorescent

Reporter dyes for imaging, qPCR, probes, and hybridization assays

Affinity

Biotin

Streptavidin capture, immobilization, and purification systems

Conjugation

Amine / Thiol

Reactive handles for coupling to dyes, proteins, surfaces, and particles

Custom

Available

Support for special linkers, spacers, crosslinkers, and project-specific formats

Discuss Your Modification View Functionalized Types

Functionalized Oligonucleotide Types

Functionalized oligonucleotides are selected based on the desired downstream function: optical detection, probe quenching, affinity capture, surface attachment, click chemistry, covalent coupling, or crosslinking.

Fluorescent Imaging

Detection Platform

Fluorescent Labeled Oligos

Oligos labeled with fluorophores for detection, imaging, and real-time monitoring in molecular and cellular assays.

Fluorescent labeled oligonucleotide with fluorophore modification
  • Common dyes include FAM, HEX, TAMRA, Cy3, and Cy5
  • Useful for qPCR, FISH, imaging, and hybridization assays
  • Available as 5’, 3’, or internal modifications depending on design
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Dual label FRET

Probe Platform

Dual-Labeled Oligos

Reporter-quencher oligos for probe-based detection systems including qPCR probes, molecular beacons, and FRET-based assays.

Dual-labeled oligonucleotide probe with fluorophore and quencher
  • Reporter and quencher dye combinations
  • Supports high signal-to-noise probe design
  • Useful for real-time PCR and target-specific detection workflows
Request Dual-Labeled Probes
Affinity Biotin

Biotinylated Oligos

Biotin-modified oligos for strong streptavidin interaction in capture, purification, immobilization, and assay development workflows.

Biotinylated oligonucleotide for streptavidin affinity capture
  • High-affinity streptavidin binding
  • Useful for pull-down, capture, and enrichment assays
  • Supports bead, plate, membrane, and surface immobilization formats
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Click chemistry Bioorthogonal

Click-Ready Oligos

Oligos functionalized with azide, alkyne, DBCO, or related handles for selective click chemistry conjugation.

Click-ready oligonucleotide with azide or alkyne functional group
  • Azide, alkyne, and strain-promoted click handles
  • Useful for controlled conjugation to dyes, peptides, ligands, and polymers
  • Supports modular post-synthesis functionalization strategies
Request Click-Ready Oligos
Amine NHS coupling

Amino-Modified Oligos

Primary amine-functionalized oligos used for conjugation to dyes, surfaces, nanoparticles, proteins, and other activated molecules.

Amino-modified oligonucleotide for NHS ester coupling and conjugation
  • 5’, 3’, and internal amino modification options
  • Compatible with NHS ester and activated carboxyl chemistries
  • Useful for labeling, immobilization, and biomolecule coupling
Request Amino-Modified Oligos
Thiol Gold binding

Thiol-Modified Oligos

Thiol-functionalized oligos for attachment to gold surfaces, nanoparticles, maleimide partners, and other thiol-reactive systems.

Thiol-modified oligonucleotide for gold binding and maleimide conjugation
  • Useful for gold nanoparticle and biosensor construction
  • Compatible with maleimide and disulfide coupling strategies
  • Supports surface attachment and nanotechnology applications
Request Thiol-Modified Oligos
Crosslinker Covalent

Cross-Linker Modified Oligos

Oligos containing reactive crosslinking groups for covalent attachment to proteins, nucleic acids, surfaces, or nearby molecular targets.

Cross-linker modified oligonucleotide for covalent interaction capture
  • Photo-crosslinker and chemical crosslinker options
  • Useful for interaction mapping and binding studies
  • Supports stable covalent capture of molecular contacts
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Custom Special linker

Custom Functionalized Oligos

Project-specific oligo designs with custom linkers, spacers, labels, affinity tags, or conjugation handles.

  • Support for custom linker and spacer selection
  • Combination modification feasibility review
  • Design support for assay-specific performance requirements
Discuss a Custom Design

Functionalized Oligo Comparison

Compare major functional oligo formats by chemistry, function, and best-fit application to choose the right modification strategy.

This table helps select the right functionalized oligo category based on the required chemistry and downstream application.

Functionalized oligo type Primary function Common modification examples Typical applications
Fluorescent labeled oligos Optical signal generation FAM, HEX, TAMRA, Cy3, Cy5 Imaging, qPCR, FISH, hybridization detection
Dual-labeled oligos Reporter-quencher detection FAM-BHQ, HEX-BHQ, TAMRA quencher pairs qPCR probes, molecular beacons, FRET assays
Biotinylated oligos Affinity capture 5’ biotin, 3’ biotin, internal biotin, biotin-TEG Streptavidin capture, pull-down, immobilization
Click-ready oligos Bioorthogonal conjugation Azide, alkyne, DBCO Post-synthesis conjugation to dyes, ligands, peptides, polymers
Amino-modified oligos Covalent coupling C6 amino, C12 amino, internal amino linkers NHS ester coupling, surface attachment, labeling
Thiol-modified oligos Gold or maleimide attachment 5’ thiol, 3’ thiol, thiol modifiers Gold nanoparticles, biosensors, maleimide conjugation
Cross-linker modified oligos Covalent interaction capture Photo-crosslinkers, reactive crosslinking groups Protein-nucleic acid interaction studies, binding-site mapping

Applications

Functionalized oligos support molecular detection, imaging, immobilization, nanotechnology, bioconjugation, and interaction-mapping workflows.

qPCR & Molecular Diagnostics

Dual-labeled probes and fluorescent oligos support target-specific detection, real-time signal generation, and diagnostic assay development.

Imaging & Hybridization Assays

Fluorescent labeled oligos are used in FISH, cellular localization studies, hybridization detection, and microscopy-based workflows.

Affinity Capture & Pull-Down

Biotinylated oligos enable streptavidin-mediated capture, purification, enrichment, and surface immobilization of nucleic acid targets.

Biosensors & Nanotechnology

Thiol-modified and amino-modified oligos support attachment to gold, nanoparticles, electrodes, and activated surfaces.

Bioconjugation

Click-ready, amino, and thiol oligos provide reactive handles for coupling oligos to dyes, peptides, proteins, ligands, polymers, and particles.

Interaction Mapping

Cross-linker modified oligos help study molecular interactions by covalently capturing nearby proteins, nucleic acids, or binding partners.

Design & Ordering Workflow

The best functionalized oligo design depends on the sequence, modification position, linker length, purification requirement, detection method, and downstream chemistry.

1. Define the Function

Choose detection, capture, conjugation, immobilization, nanoparticle attachment, or crosslinking as the primary goal.

2. Select the Modification

Pick the dye, quencher, biotin, azide, alkyne, amino, thiol, crosslinker, linker, or spacer format.

3. Confirm Format

Finalize sequence, position, scale, purification, analytical requirements, and delivery format.

Fastest quote: Send your oligo sequence, modification type, modification position, desired scale, purity requirement, application, and preferred delivery format.

Design Support

Modification Position

Support for 5’, 3’, and internal modification planning based on assay design and chemistry compatibility.

Linker & Spacer Selection

Spacer length can affect accessibility, conjugation efficiency, surface presentation, and probe performance.

Purification Strategy

Functionalized oligos may require HPLC, PAGE, desalting, or project-specific purification depending on complexity and use.

Why Choose Bio-Synthesis

Bio-Synthesis combines broad modification chemistry, custom synthesis support, and application-focused guidance for research and diagnostic programs.

Broad Modification Coverage

Support for common and specialized oligo functionalization strategies including dyes, affinity tags, reactive handles, and crosslinkers.

Custom Synthesis Expertise

Project-specific feasibility review for complex oligo designs, multi-modified oligos, and special functional groups.

Application-Focused Support

Guidance from design discussion through synthesis, purification, QC, scale selection, and quote preparation.

FAQ

What are functionalized oligonucleotides?

Functionalized oligonucleotides are DNA or RNA oligos modified with labels, affinity tags, reactive handles, or crosslinking groups to enable detection, capture, immobilization, conjugation, or molecular interaction studies.

Which functionalized oligos does Bio-Synthesis support?

Bio-Synthesis supports fluorescent labeled oligos, dual-labeled oligos, biotinylated oligos, click-ready oligos, amino-modified oligos, thiol-modified oligos, and cross-linker modified oligos.

Can modifications be placed at the 5’, 3’, or internal position?

Many modifications can be incorporated at the 5’ end, 3’ end, or internal positions depending on the modification chemistry, sequence, and application requirements.

What is the difference between fluorescent labeled and dual-labeled oligos?

Fluorescent labeled oligos usually contain one dye for detection or imaging. Dual-labeled oligos typically contain both a reporter and quencher, making them useful for qPCR probes, molecular beacons, and FRET-based assays.

When should I use biotinylated oligos?

Biotinylated oligos are commonly used when strong streptavidin binding is needed for capture, immobilization, pull-down, enrichment, or surface-based assay formats.

When should I choose amino, thiol, or click-ready oligos?

Amino-modified oligos are often used for NHS ester coupling, thiol-modified oligos for gold or maleimide chemistry, and click-ready oligos for selective bioorthogonal conjugation using azide, alkyne, DBCO, or related handles.

What information helps with quoting a functionalized oligo?

For a fast quote, provide the sequence, modification type, modification position, desired scale, purification requirement, application, and preferred dye, linker, spacer, or conjugation chemistry.

More FAQ'sAll FAQ's

Contact & Quote Request

Bio-Synthesis can help evaluate functionalized oligo design, modification compatibility, linker selection, purification, and scale requirements.

Information for a Fast Quote

  • Oligonucleotide sequence
  • Modification type and position
  • Scale and purity requirements
  • Application and timeline
  • Preferred dye, linker, spacer, or conjugation chemistry

Contact Bio-Synthesis

Get a Quote Talk to a Scientist

Why Choose Bio-Synthesis

Trusted by biotech leaders worldwide for over 45+ years of delivering high quality, fast and scalable synthetic biology solutions.

Greetings Researchers,

Please be advised that any information, guidelines, writeups, and oral/video/graphic content on our website are intended solely as general guidelines.
It is the researcher's sole responsibility to conduct thorough research on the designs of the products intended for their experiments before submitting
their designs to Biosynthesis for review of production feasibility.
Thank you for your understanding.

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