Biotin STP Esters – VectorLabs https://staging.vectorlabs.com From linker design and synthesis, bioconjugated design and manufacturing, biomolecule labeling and functionalization, and detection system and solutions, our team is here to help you move forward, with impact. Wed, 22 Oct 2025 17:08:03 +0000 en-US hourly 1 https://wordpress.org/?v=6.8.3 https://staging.vectorlabs.com/wp-content/uploads/2024/11/V-favicon-02-100x100.png Biotin STP Esters – VectorLabs https://staging.vectorlabs.com 32 32 Biotin-PEG4-STP Ester https://staging.vectorlabs.com/products/biotin-peg4-stp-ester/ Tue, 19 Sep 2023 19:31:51 +0000 https://staging.vectorlabs.com/?post_type=product&p=22045 Description

Biotin-PEG4-STP Ester (4-Sulfo-2,3,5,6-tetrafluorophenyl ester) is an amine-reactive, water-soluble labeling reagent used to modify proteins, antibodies, and other amine-containing biopolymers in 100% aqueous media. The hydrophilic polyethylene glycol (PEG) spacer arm of this reagent imparts water solubility that is transferred to the labeled molecule, thus reducing aggregation of labeled proteins stored in solution. The PEG spacer arm also gives the reagent a long and flexible connection to minimize steric hindrance involved with binding to avidin molecules.

STP esters undergoes hydrolysis in aqueous media at much slower rate compared to NHS esters allowing for more efficient labeling of biomolecules in aqueous media. Biotin-PEG4-STP Ester reacts readily with primary amines to give the same acylation products as NHS and pentafluorophenyl (PFP) esters.

Specifications

Unit Size 5 mg, 25 mg, 100 mg
Molecular weight 719.72
Chemical composition C27H37F4N3O11S2
CAS N/A
Solubility DMSO, DMF, Water
Purity >90%
Appearance White to grey amorphous solid
Storage Conditions -20°C. Desiccate
Shipping Conditions Ambient temperature

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Description

Biotin-PEG4-STP Ester (4-Sulfo-2,3,5,6-tetrafluorophenyl ester) is an amine-reactive, water-soluble labeling reagent used to modify proteins, antibodies, and other amine-containing biopolymers in 100% aqueous media. The hydrophilic polyethylene glycol (PEG) spacer arm of this reagent imparts water solubility that is transferred to the labeled molecule, thus reducing aggregation of labeled proteins stored in solution. The PEG spacer arm also gives the reagent a long and flexible connection to minimize steric hindrance involved with binding to avidin molecules.

STP esters undergoes hydrolysis in aqueous media at much slower rate compared to NHS esters allowing for more efficient labeling of biomolecules in aqueous media. Biotin-PEG4-STP Ester reacts readily with primary amines to give the same acylation products as NHS and pentafluorophenyl (PFP) esters.

Specifications

Unit Size5 mg, 25 mg, 100 mg
Molecular weight719.72
Chemical compositionC27H37F4N3O11S2
CASN/A
SolubilityDMSO, DMF, Water
Purity>90%
AppearanceWhite to grey amorphous solid
Storage Conditions-20°C. Desiccate
Shipping ConditionsAmbient temperature

Documents

Protein Labeling Calculator

Enter only one — either volume or amount of protein to be labeled
Enter only one — either maximum concentration of DMSO or volume DMSO added to label

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