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Linker and Spacer Phosphoramidites |
Linker phosphoramidites provide options to link oligonucleotides to additional groups (e.g., chemical delivery system for therapeutics, fluorescent dyes, amines, phosphates) or attach to a solid surface like a DNA chip. On the other hand, spacer phosphoramidites can alter oligonucleotide conformation and/or reduce steric hinderance for applications such as aptamers and tagging/labeling assays.
Our linker phosphoramidite offerings include monomethoxytrityl (MMT) or trifluoroacetic acid (TFA) protection, for addition of a primary amine to the 5′ position of oligonucleotides. Phosphorylation phosphoramidites are also available for incorporation of phosphate group to the 5′ or 3′ position of oligonucleotides, for increased stability and ligation applications.
Our spacer phosphoramidite offerings include three carbons (C3), spacer 18 (HEG), and reverse abasic.
Our linker and spacer phosphoramidites are supported by:
† May not be applicable in all regions.
Processes are monitored from material procurement through final QC and product release for batch-to-batch reproducibility. Purity of each phosphoramidite lot may be assessed by HPLC, NMR, and water determination by the Karl Fischer method. Our rigorously controlled manufacturing processes help minimize levels of reactive impurities which could be incorporated into the oligonucleotide during synthesis and result in the accumulation of by-products.
Thermo Scientific 5′ amino linker ß-cyanoethyl phosphoramidites (CEP) are available as MMT or TFA protected.
Thermo Scientific phosphorylating CEP can be used for addition of a phosphate group to the 5′ position of an oligonucleotide (final synthesis addition), or 3′ end when used as the first addition off a solid support.
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5′-Aminohexyl Linker CEP | TFA-Aminolinker CEP | Phosphorylating CEP | |
---|---|---|---|
Cat. No. | 27-0035 | 27-1792 | 27-1794 |
Chemical name | 6-(4-monomethoxytritylamino)-hexyl-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite | 6-(N-trifluoroacetylamino)hexyl-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite | 2-[2-(4,4-dimethoxytrityloxy)ethylsulfonyl]ethyl-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite |
Formula | C35H48N3O3P | C17H31F3N3O3P | C34H45F3N2O7PS |
Molecular weight | 589.75 g/mol | 413.42 g/mol | 656.66 g/mol |
CAS # | 114616-27-2 | 133975-85-6 | 108783-02-4 |
HPLC purity | ≥97% | NA | ≥95% |
31P NMR purity | NA | ≥90.0% | NA |
Shipping condition | Dry ice | Dry ice | Ambient, desiccated. Keep vial upright during storage |
Water content | NA | ≤0.3% | NA |
Storage condition | –20°C |
For quotes, flexible/bulk packaging, custom services, or items not listed above, please contact us or submit your inquiry.
The Thermo Scientific C3 spacer CEP can be used to incorporate a three-carbon spacer or add sequentially to create longer spacer arms. Thermo Scientific spacer 18 hexaethyleneglycol (HEG) CEP reduces possible steric hinderance effects and/or protection from exonucleases. Thermo Scientific reverse abasic CEP introduces abasic sites in oligonucleotides to study their biological effects.
C3-Spacer-CEP | HEG (Spacer 18) phosphoramidite | Reverse abasic CEP | |
---|---|---|---|
Cat. No. | 27-1795 | 27-1786 | 27-1998 |
Chemical name | 3-(4,4'-dimethoxytrityloxy)propyl-1-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite | 18-O-(4,4'-dimethoxytrityl)-Hexaethyleneglycol-1-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite | 3-O-(4,4’-dimethoxytrityl)-1,4-anhydro-2-deoxy-D-ribitol-5-O-(β-cyanoethyl-N,N-diisopropyl) |
Formula | C33H43N2O5P | C42H61N2O10P | C35H45N2O6P |
Molecular weight | 578.7 g/mol | 784.9 g/mol | 620.72 g/mol |
HPLC purity | ≥98% | ≥95% | ≥98% |
31P NMR purity | ≥98% | ≥98% | ≥98% |
Material source | Non animal source (no TSE/BSE risk) | ||
Shipping / storage condition | Dry ice / –20°C |
For quotes, flexible/bulk packaging, custom services, or items not listed above, please contact us or submit your inquiry.
仅供科研使用,不可用于诊断目的。