Thermo Fisher Scientific TheraPure RNA phosphoramidites are designed for oligonucleotide (or oligoribonucleotide) manufacturers requiring the highest quality with well defined impurity profiles and strictly controlled processes.  With ISO9001:2015 manufacturing standards, all synthesis and QC processes are thoroughly documented to provide a consistent, high-quality product, with minimal batch-to-batch variability. Tightly controlled critical impurities, water content, and residual solvents make TheraPure phosphoramidites an ideal choice for therapeutic (and research) applications requiring high fidelity oligo synthesis, such as gene synthesis, gene editing, CRISPR-cas9 gRNA, ASO, and siRNA.  

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TheraPure RNA phosphoramidites were engineered specifically for oligonucleotide manufacturers requiring highly defined impurity profiles, strictly controlled processes with thorough documentation, and a rigorous process change control.  With our in-house advanced analytical capabilities including LC-MS, GC, HPLC, 31P NMR and 1H NMR, meeting possible regulatory requirements should be achievable. Collaborative, customized specifications are always welcome for further discussion. 

  • QC testing always performed on raw materials and intermediates using high-definition analytics 
  • State-of-the-art purification methods utilized to obtain the highest amidite purity
  • Overall, high purity and tight critical impurity level control yields excellent batch-to-batch reproducibility

  Click images to enlarge

Bz-rA CEP

iBu-rG CEP

Ac-rC CEP

rU CEP

  Bz-rA CEP iBu-rG CEP Ac-rC CEP rU CEP
Cat. No. 27-1903 27-1906 27-1805 27-1804
Phosphoramidite Description 5′-O-(4,4′-Dimethoxytrityl)-N6-benzoyl-2′-O-[(tert-butyl)dimethylsilyl]-adenosine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-N2-isobutyryl-2′-O-[(tert-butyl)dimethylsilyl]-guanosine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-N4-acetyl-2′-O-[(tert-butyl)dimethylsilyl]-cytidine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-2′-O-[(tert-butyl)dimethylsilyl]-uridine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite
Formula C53H66N7O8PSi C50H68N7O9PSi C47H64N5O9PSi C45H61N4O9PSi
Molecular weight

988.2 g/mol 970.1 g/mol 902.1 g/mol 861.1 g/mol
CAS # 104992-55-4 147201-04-5 121058-88-6 118362-03-1
Appearance Color intensity must not exceed Pantone #P1-4U or #P4-2U
Solution Clarity   Free from undissolved particulate at 0.2M solution in ACN
HPLC purity*
  • ≥ 99%
  • M-11 Impurity: ≤ 0.01%
31P NMR purity* 
  • ≥ 99%
  • Sum of non-primary peaks in 140-152ppm range: ≤ 0.5%
Residual Solvent ≤ 3.0% total % by weight solvent residue
Shipping / Storage condition Ambient / –20 °C
Water content  ≤ 0.3% by KF Method
Material Origin Non-animal source (no TSE/BSE risk)
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* For more specification details, contact us.

Traditional base protection methods are used to ensure quality and reliability for routine oligonucleotide synthesis.

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Bz-rA CEP

iBu-rG CEP

Ac-rC CEP

rU CEP

  Bz-rA CEP iBu-rG CEP Ac-rC CEP rU CEP
Cat. No. 27-1403 27-1406 27-1405 27-1404
Phosphoramidite Description 5′-O-(4,4′-Dimethoxytrityl)-N6-benzoyl-2′-O-TBDMSi-adenosine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-N2-isobutyryl-2′-O-TBDMSi-guanosine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-N4-acetyl-2′-O-TBDMSi-cytidine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-2′-O-TBDMSi-uridine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite
Formula C53H66N7O8PSi C50H68N7O9PSi C47H64N5O9PSi C45H61N4O9PSi
Molecular weight

988.2 g/mol 970.1 g/mol 902.1 g/mol 861.1 g/mol
CAS # 104992-55-4 147201-04-5 121058-88-6 118362-03-1
Appearance Color intensity must not exceed Pantone #P1-4U or #P4-2U
HPLC purity ≥ 98.0%
31P NMR purity 
  • ≥ 98.0%
  • Sum of non-primary peaks in 140-152ppm range: ≤ 0.5%
Shipping / Storage condition Ambient / –20 °C
Water content  ≤ 0.3% by KF Method
Material Origin Non-animal source (no TSE/BSE risk)
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Use these additional amidites with Ac-rC and U to mitigate the time for your oligonucleotide deprotection.


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PAC-rA CEP

iPrPAC-rG CEP

  Therapure PAC-rA CEP Therapure iPrPAC-rG CEP
Cat. No. 27-1803 27-1806
Phosphoramidite Description 5′-O-(4,4′-Dimethoxytrityl)-N6-phenoxyacetyl-2′-O-TBDMSi-adenosine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite 5′-O-(4,4′-Dimethoxytrityl)-N2-isopropylphenoxyacetyl-2′-O-TBDMSi-guanosine-3′-O-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite
Formula C54H68N7O9PSi C57H74N7O10PSi
Molecular weight 1018.2 g/mol 1076.3 g/mol
CAS # 121058-86-4 956580-73-7
Solution Clarity 0.2M solution in ACN is free from undissolved particulate
HPLC purity ≥ 99%
31P NMR purity
  • ≥ 99%
  • Sum of non-primary peaks in 140-152ppm range: ≤ 0.5%
  • Single impurity in 140-152ppm range: None > 0.3%
Water content  ≤ 0.3% (KF Method)
Shipping / Storage  condition Ambient / –20 °C
Material Origin  Non-animal source (no TSE/BSE risk)
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Process and supply chain control

  • Processes are monitored from material procurement through final QC and product release under updated ISO9001:2015 standards, providing batch-to-batch reproducibility
  • A controlled raw material supply chain and established vendor partnerships ensure consistency and security of supply
  • Purity of each RNA phosphoramidite lot is assessed by HPLC and 31P NMR analyses
  • Rigorously controlled manufacturing processes minimize levels of reactive P(III) impurities which could be incorporated into the oligonucleotide and result in the accumulation of by-products

Product configurations

  • Fast or standard deprotection options are available.
  • TheraPure RNA phosphoramidites are available with 2′-TBDMS protection or other nuclease resistant 2′-modifications
  • Ask us about TOM-protected RNA or other custom RNA phosphoramidites.

Custom services

  • Custom manufacturing services are available to assist in the development or scale-up of phosphoramidite compounds
  • Specialty phosphoramidites can be manufactured with base or sugar (2′, 3′ or 5′ positions) modifications

Flexible packaging

  • Common oligo synthesizer pack sizes are available for immediate delivery
  • Custom and bulk packaging are also available. Contact us to learn more.

 

Not finding what you are looking for? We also offer DNA phosphoramiditesspecialty phosphoramiditesdye-labeled phosphoramidites2′-modificationslinker and spacer phosphoramidites, and succinates and CPG support synthesis supportsContact us to learn more.

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