Product manual
Product use, preparation, operating conditions and storage.
Linkers and crosslinkersCrosslinking reagent
(4E)-TCO-PEG4-NHS Ester
Cat. No.QH-70-7012
Install (4E)-TCO on amine-bearing samples through a PEG4 spacer.
Packs & quoteTCO
Tetrazine-reactive endPEG4
NHS
Amine-reactive endProduct formNHS Ester
TargetPrimary amines; subsequently a suitable tetrazine
Preparation and storage
- Storage
- Store at -20°C, protect from light and moisture
Reactive ends and coupling route
NHS couples to an amine while retaining PEG4–TCO. The spacer changes handle-to-target distance; evaluate coupling and background in the actual sample.
Sequential bioconjugation
Install (4E)-TCO on amine-bearing samples through a PEG4 spacer.
Product and functional assessment
After cleanup, compare TCO availability, target recovery and function.
Specifications
Product information
- Product name
- (4E)-TCO-PEG4-NHS Ester
- Cat. No.
- QH-70-7012
- Product form
- NHS Ester
- Target
- Primary amines; subsequently a suitable tetrazine
- Pack sizes
- 50 mg / 100 mg / 250 mg
Preparation and properties
- CAS
- 1613439-69-2
- Storage
- Store at -20°C, protect from light and moisture
Product parameters
Use parameters for the exact catalog number when preparing reagents, setting reagent input or calculating results. Request a lot-specific CoA for test results.
Protocol
Pre-reaction checks
Check solvent and working concentration; PEG does not imply unrestricted aqueous solubility.
Solvent and molar calculation
Select solvent for this structure, salt form and solubility. Calculate molar inputs from its molecular weight; equal masses of different linkers are not equimolar.
Define the sequence
Confirm the first target group and subsequent partner, then set input, pH, temperature and time for this reagent.
Validate at small scale
Check solvent and working concentration; PEG does not imply unrestricted aqueous solubility.
Separate and proceed
Remove free reagents that interfere with the next step, retain the desired handle and complete the planned pairing.
Assess the outcome
After cleanup, compare TCO availability, target recovery and function.
Request product documentation
Select a document and enter your phone and email. Include the lot number for a CoA.
(4E)-TCO-PEG4-NHS EsterQH-70-7012
Certificate of analysis (CoA)
Lot-specific test results. Include the lot number from the vial.
Safety data sheet (SDS)
Handling, storage and emergency response information.
Quality and lot information
Untreated sample
Compare integrity and function with an untreated aliquot from the same preparation.
Reaction-pair control
Omit activation or a paired component to assess adsorption, residual reagents and nonspecific reaction.
References
Thermo Fisher · Amine-reactive chemistry
thermofisher.com
Distinguishes amine-reactive forms such as NHS and isothiocyanate and competing buffers; separately establish whether a nucleic-acid sample has accessible amines.
Tetrazine ligation: fast bioconjugation based on inverse-electron-demand Diels–Alder reactivity
Blackman ML, Royzen M, Fox JM. · Journal of the American Chemical Society · 130(41):13518–13519 · 2008
Studies catalyst-free tetrazine–TCO cycloaddition. Rates and stability depend on substituent structure; reported kinetics are not specifications for every linker.
DOI: 10.1021/ja8053805
Frequently asked questions
How do this reagent’s handles participate in coupling?
NHS couples to an amine while retaining PEG4–TCO. The spacer changes handle-to-target distance; evaluate coupling and background in the actual sample.
Does this reagent itself provide fluorescence?
It is used for coupling, modification, blocking or biotin deposition. Fluorescence requires a suitable fluorophore or detection system.
Can another linker’s conditions be reused?
Reactive ends, spacers, salt form and solubility can differ. Establish a small-scale reaction with this reagent and analyze the product.
How is the intended outcome confirmed?
After cleanup, compare TCO availability, target recovery and function.