Biotin and derivatives
Medchemexpress LLC Nsp-sa-nhs | 199293-83-9 | 99.7% | 681.73 | C32H31N3O10S2 | 10 MG
Acridinium ester reagent for chemiluminescent labeling in immunoassays. It is provided as a high-purity solid for research use and is intended to enable sensitive detection when conjugated to analytes in chemiluminescent assay workflows.
- Used for chemiluminescent immunoassay labeling.
- High purity (≈99.7%) for sensitive detection.
- Molecular weight 681.73 g·mol-1 and formula C32H31N3O10S2.
- CAS number 199293-83-9 for unambiguous identification.
- Supplied in milligram quantities suitable for conjugation workflows.
- Store sealed, protected from moisture and light, preferably at -20°C.
eMolecules Chem-Impex DBCO-NHS ester 5mg 490843457 33411 0 000 1353016-71-3 MFCD24386367 402 406 C23H18N2O5
Chem-Impex DBCO-NHS ester 5mg 490843457 33411 0 000 1353016-71-3 MFCD24386367 402 406 C23H18N2O5
Medchemexpress LLC 3H-indolium inner salt (TEA), N-hydroxysuccinimide ester | 1620475-28-6 | 95.0% | 1043.25 | C45H62N4O16S4 | 10 MG
Alexa Fluor 647 NHS ester (TEA) is a far-red, photostable succinimidyl ester dye supplied as the triethylammonium (TEA) salt for covalent labeling of primary amines on proteins, peptides, and amine-modified oligonucleotides. It produces strong fluorescence suitable for fluorescence imaging, flow cytometry, and other fluorescence-based assays. The product is supplied as a blue to dark blue solid and is sensitive to moisture and light.
- Reactive succinimidyl ester for covalent labeling of primary amines.
- Far-red fluorescence compatible with 633-647 nm excitation for imaging and flow cytometry.
- Photostable with high signal intensity for prolonged imaging.
- Suitable for labeling proteins, peptides, and amine-modified oligonucleotides.
- Supplied as a blue to dark blue solid in TEA salt form; store sealed, away from moisture and light.
Medchemexpress LLC DBCO-NHCO-S-S-NHS ester | 96.0% | 565.66 | C28H27N3O6S2 | 25 MG
DBCO-NHCO-S-S-NHS ester is a cleavable antibody-drug conjugate (ADC) linker and click-chemistry reagent containing a DBCO moiety. It is designed to couple to amines via the NHS ester and to react with azide-bearing molecules through strain-promoted alkyne-azide cycloaddition (SPAAC); the disulfide (S-S) bond provides a reducible, cleavable linker for payload release.
- cleavable disulfide linker for reductive release
- n-hydroxysuccinimide (nhs) ester for amine coupling
- dbco group enables copper-free spaac click chemistry with azides
- solid, white to off-white appearance for easy handling
- available in small research pack sizes (including 25 mg)
- storage: powder at -20°C; in solvent stability at -80°C (6 months) or -20°C (1 month)
Medchemexpress LLC Bis-SS-C3-NHS ester | 98604-88-7 | 98.0% | 432.47 | C16H20N2O8S2 | 1 G
Bis-SS-C3-NHS ester is a disulfide-cleavable N-hydroxysuccinimide (NHS) ester linker used for bioconjugation and antibody-drug conjugate (ADC) synthesis. It couples to primary amines via NHS-ester chemistry and releases payloads under reducing intracellular conditions.
- Molecular weight: 432.47
- Chemical formula: C16H20N2O8S2
- Cas number: 98604-88-7
- Purity: 98.0%
- Appearance: white to off-white solid
- Reactive group: NHS ester for coupling to primary amines
- Application: cleavable disulfide linker for ADC synthesis and bioconjugation
- Available pack size: 1 g
Medchemexpress LLC PD-L1 Human Biotin 20ug
Recombinant, biotinylated human PD-L1 produced in HEK293 cells and supplied as a lyophilized 20 μg vial for research use. The protein includes C-terminal human Fc and Avi tags, is characterized for purity and molecular mass, and exhibits specific binding activity suitable for PD-1/PD-L1 interaction and immunoassay applications.
- Expressed in HEK293 mammalian cells.
- Contains C-terminal human Fc and Avi tags.
- Site-specific biotinylation via Avi tag.
- Purity greater than 95% by reducing SDS-PAGE.
- Lyophilized from 20 mM PB, 150 mM NaCl, pH 7.4.
- Predicted molecular mass 54.2 kDa; apparent 70-95 kDa by SDS-PAGE.
- Demonstrated binding activity with ED50 of 15.30 ng/mL.
- Store frozen and aliquot after reconstitution for long-term stability.
Medchemexpress LLC Endo-BCN-NHS carbonate | 1426827-79-3 | MFCD19705416 | ≥97.0% | 291.30 g·mol⁻1 | C15H17NO5 | 500 MG
endo-BCN-NHS carbonate is an NHS-activated bicyclo[6.1.0]non-4-yne (BCN) carbonate reagent for bioconjugation. It couples to primary amines to install a strained cyclooctyne handle for strain-promoted azide-alkyne cycloaddition (SPAAC), enabling copper-free bioorthogonal labeling of proteins, peptides, and polymers.
- NHS-activated carbonate enables efficient coupling to primary amines.
- Introduces a strained BCN handle for copper-free SPAAC reactions.
- High purity suitable for analytical and preparative bioconjugation.
- Solid form with recommended storage at -20°C for prolonged stability.
- Compatible with proteins, peptides, and polymer modification workflows.
TARGETMOL CHEMICALS INC Cy3 NHS ester 5MG
Also available in 1 mg, 10 mg, 25 mg, 50 mg, 100 mg and bulk. Please contact Fisher for quotes. Cy3 NHS ester is a fluorescent dye used to label amino groups in proteins, peptides, antibodies, and oligonucleotides. The excitation/emission (Ex/Em) values of Cy3 NHS ester are 550 nm/570 nm. Purity 98.03%
Medchemexpress LLC PC azido-PEG3-NHS carbonate ester | 1802907-96-5 | MFCD29052189 | 98.7% | 640.60 | C26H36N6O13 | 10 MG
PC Azido-PEG3-NHS carbonate ester is a photocleavable linker used to attach an azido-terminated PEG3 spacer to primary amines on proteins, amine-modified oligonucleotides, and other amine-containing molecules via an NHS carbonate ester, enabling bioorthogonal click chemistry and light-triggered release.
- Photocleavable linker for light-triggered release
- Labels primary amines on proteins and oligonucleotides
- Installs azido-terminated PEG3 spacer via NHS carbonate chemistry
- Enables copper-catalyzed azide-alkyne click reactions
- High purity suitable for bioconjugation (≈98.7%)
- Soluble in DMSO at ≥116.67 mg/mL
- Store at -20 °C in pure form for long-term stability