Description

Texas Red-2-Sulfonamidoethyl Mercaptan is a reactive, sulfhydryl-containing derivative of the Texas Red fluorophore, designed for site-specific labeling of biomolecules. This compound matters for researchers and manufacturers requiring high-performance, red-emitting fluorescent probes with excellent photostability for demanding detection applications. It is primarily needed by professionals in bioconjugation, diagnostic assay development, and advanced microscopy who require reliable, consistent labeling reagents.

Application

• Site-specific protein and antibody labeling via maleimide or iodoacetyl chemistry for creating stable fluorescent conjugates.
• Development of fluorescent probes and biosensors for in vitro diagnostic (IVD) kits and research assays.
• Labeling of oligonucleotides and nucleic acids for fluorescence in situ hybridization (FISH) and other genomic techniques.
• Cell surface and intracellular labeling for flow cytometry and confocal microscopy applications.
• Polymer and nanoparticle functionalization to create advanced materials for biomedical imaging.
• As a key intermediate in the synthesis of more complex fluorescent dyes and targeted imaging agents.

Basic Information

Product Name	Texas Red-2-Sulfonamidoethyl Mercaptan
CAS No.	1258221-19-0
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Texas Red C2 Maleimide; Texas Red® Maleimide; Sulforhodamine 101 C2 Maleimide; Texas Red® Thiol-Reactive Probe; 2-((5-(2-(1-(2,5-Dioxopyrrolidin-1-yl)-1-oxo-3-sulfopropan-2-yl)amino)-2-oxo-2,5-dihydro-1H-pyrrol-3-yl)amino)-5-oxo-4-(4-(4-(sulfomethyl)phenyl)diazenyl)phenyl)-5-oxopentyl)amino)-5-sulfobenzene-1,3-disulfonate; Texas Red™ Thiol-Reactive Dye
EINECS	Contact for details

Quality Control

Our Texas Red-2-Sulfonamidoethyl Mercaptan is produced under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for sensitive bioconjugation work. Certificates of Analysis (COA) with lot-specific data are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a freezer at -20°C or below under desiccant. This material is hygroscopic (moisture-sensitive) and light-sensitive. Allow the sealed vial to equilibrate to room temperature before opening to minimize condensation and moisture uptake.

Specification

Item	Specification
Appearance	Dark red to purple solid
Identification (HPLC/UV-Vis)	Conforms
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility	Soluble in DMSO, DMF; sparingly soluble in water

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.