Biotin and derivatives
Medchemexpress LLC m-PEG1-NHS ester 1g | 1027371-75-0 | 201.18 g/mol | 1 G
m-PEG1-NHS ester is a methoxy-terminated polyethylene glycol N-hydroxysuccinimide (NHS) ester used as a short PEG linker and an amine-reactive coupling reagent for bioconjugation and linker assembly in medicinal chemistry.
- Amine-reactive NHS ester for efficient conjugation to primary amines.
- Short PEG spacer (approx. 201.18 g/mol) that improves solubility and reduces steric hindrance.
- Supplied as a solid with recommended powder storage at -20°C to maintain stability.
- Soluble in water and PBS with ultrasonic warming; H2O 33.33 mg/mL, PBS 100 mg/mL.
- Purity reported as 95.0% for typical batches.
Medchemexpress LLC Interleukin 23 | >90.0% | 20UG
Recombinant human interleukin-23 (heterodimer of p19 and p40), biotinylated and produced in HEK293 cells. Supplied as a 0.2 μm filtered PBS solution, this protein is designed for research into IL-23 receptor binding, JAK/STAT signaling, and Th17-related immune responses. Handle and store according to supplier recommendations to maintain activity.
- Human IL-23 heterodimer (p19 + p40).
- Biotinylated for affinity-based detection and capture.
- Expressed in HEK293 mammalian cells for native glycosylation.
- Contains C-terminal His and Avi tags to facilitate purification and immobilization.
- Purity >90% as determined by reducing SDS-PAGE.
- Predicted molecular weight ~55.8 kDa.
- Supplied in PBS, 0.2 μm filtered; avoid repeated freeze-thaw cycles.
Medchemexpress LLC Cyanine5.5 NHS ester tetrafluoroborate | 2375105-86-3 | 98.4% | 767.66 | 50 MG
Cyanine5.5 NHS ester tetrafluoroborate is a common fluorescent marker that belongs to the cyanine dye series. It is designed to interact with biomolecules and can bind to double-helical DNA through intercalation, leading to enhanced fluorescence upon binding.
- Functions as a common fluorescent marker for biomolecules
- Interacts with various biomolecules
- Binds to double-helical DNA through intercalation
- Enhances fluorescence upon DNA binding
- Belongs to the cyanine dye series
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.