Biotin and derivatives
Medchemexpress LLC B7-H4 Human Biotin 100ug | 100ug
The B7-H4 protein acts as a negative regulator inhibiting T cell-mediated immune responses including activation proliferation cytokine production and cytotoxicity When expressed on tumor macrophages it cooperates with regulatory T cells to suppress tumor-associated antigen-specific T cell immunity B7-H4 Protein Human (Biotinylated HEK293 His-Avi) is the recombinant human-derived B7-H4 protein expressed by HEK293 with C-Avi C-His labeled tag
Medchemexpress LLC Azido-PEG8-NHS ester | 1204834-00-3 | 98.0% | 564.6 g/mol | C23H40N4O12 | 25 MG
Azido-PEG8-NHS ester is an 8-unit polyethylene glycol (PEG) bifunctional linker bearing an azide on one terminus and an N-hydroxysuccinimide (NHS) ester on the other. It is used for bioconjugation: the azide enables azide-alkyne cycloaddition (copper-catalyzed or strain-promoted), while the NHS ester reacts with primary amines to form stable amide bonds.
- Azide enables copper-catalyzed and strain-promoted click chemistry.
- N-hydroxysuccinimide ester labels primary amines (for lysine and amine-modified substrates).
- PEG8 spacer increases hydrophilicity and improves solubility in organic and mixed solvents.
- Soluble in DMSO, dichloromethane, and DMF.
- Commonly used as an ADC or PROTAC linker and general bioconjugation reagent.
- Store at -20 °C to preserve stability.
Medchemexpress LLC L-biotin | 21788-37-4 | 99.7% | 244.31 g/mol | C10H16N2O3S | 50 MG
L-biotin is the unnatural enantiomer of biotin supplied as a high-purity research reagent for laboratory use (not for human or clinical applications).
- High purity (reported 99.5-99.7%).
- Cas number 21788-37-4.
- Molecular weight 244.31 g/mol.
- Chemical formula C10H16N2O3S.
- Available in small milligram quantities such as 50 MG.
Medchemexpress LLC Bis-PEG21 N-hydroxysuccinimide ester | 2221948-98-5 | 98.0% | 1237.34 | C54H96N2O29 | 50 MG
Bis-PEG21 N-hydroxysuccinimide ester is a polyethylene glycol (PEG21) based homobifunctional NHS ester linker used for bioconjugation. It provides two reactive NHS ester termini for amine coupling and a long PEG spacer to increase solubility and flexibility, making it suitable for PROTAC and antibody-drug conjugate (ADC) synthesis.
- PEG21 spacer increases solubility and molecular flexibility.
- Two NHS ester groups enable efficient amine coupling.
- Suitable as a cleavable linker in ADC and PROTAC applications.
- High purity with analytical data and a certificate of analysis available.
- Available in multiple pack sizes; supplier data notes a 50 MG pack though manufacturer lists 100 MG as the smallest standard pack.
Medchemexpress LLC Biotin methyl ester 1g
Biotin methyl ester is a biochemical reagent that can be used as a biological material or organic compound for life science related research
