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🧬 Peptide & Nucleic Acid Chemistry · Method

Nucleic Acid Modification

Chemical modification of nucleic acids
🎯 Difficulty ★★★ Advanced Duration About 1–2 days 🎯 Use Introduce fluorophore, phosphorothioate, 2'-modifications to improve stability, detection and potency
📖 Principle
Incorporate modified nucleotides or conjugate groups during synthesis/enzymatic steps to add function or stability
Below are 4 steps. Open each to see how to do it and add products to your shared list.

📋 Workflow

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1

Design modification strategy

1 h
Select modification site and type (terminal, internal, specific group) per application
💡 Tip Position affects function/stability
⚠️ Caution Balance modification level with activity
🧪 Materials for this step (click to shop by spec/brand)
2

Select modification monomers

30 min
Select phosphorothioate, 2'-OMe/LNA, fluorescent modified phosphoramidite monomers
💡 Tip Monomer purity determines quality
⚠️ Caution Handle monomers dry
🧪 Materials for this step (click to shop by spec/brand)
3

Synthesis and modification introduction

Hours-1 day
Incorporate modified monomers during oligo synthesis or perform site-specific conjugation
💡 Tip Set positions in synthesis cycle
⚠️ Caution Monitor coupling efficiency
🧪 Materials for this step (click to shop by spec/brand)
4

Purification and performance verification

1 day
Purify modified product, verify modification site/structure, test stability/activity
💡 Tip MS confirms modification present
⚠️ Caution Modification may affect annealing/hybridization
🧪 Materials for this step (click to shop by spec/brand)

⚠️ 5 Common Beginner Mistakes

  • Excess modification impairs hybridization/activity
  • Wrong position compromises function
  • Impure monomers cause defects
  • Modification complicates purification/QC
  • Incomplete conjugation loses label

❓ FAQ

+What is phosphorothioate for?
Increases nuclease resistance and in vivo stability, common in antisense/siRNA.
+How to confirm modification?
Confirm mass shift and modified-site fragments by mass spec.
+Modification affects hybridization?
Choose low-impact modifications like LNA (increases affinity) and optimize sequence.

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Data authenticity: Product categories from JW Supply Chain standard taxonomy; method→step→product connected. Last updated: 2026-08-23 · v3.0