Description

Peg21 CAS NO 351342-08-0 is a high-purity polyethylene glycol derivative, specifically a 21-unit PEG chain, valued for its precise molecular weight and consistent performance as a linker or modifier. This compound is essential for enhancing solubility, stability, and biocompatibility in advanced formulations. It is primarily needed by research institutions and manufacturers in the pharmaceutical, biotechnology, and specialty chemical sectors for applications in drug delivery, bioconjugation, and material science.

Application

• Pharmaceutical Linker: Used as a spacer or linker in antibody-drug conjugates (ADCs) and peptide therapeutics to improve pharmacokinetics.
• Bioconjugation Reagent: Facilitates the attachment of proteins, peptides, or small molecules to various carriers or surfaces.
• Drug Delivery Systems: Incorporated into nanoparticles, liposomes, and hydrogels to enhance drug solubility and prolong circulation time.
• Polymer Chemistry: Serves as a building block or initiator for synthesizing tailored copolymers and functional materials.
• Surface Modification: Used to create hydrophilic, protein-resistant coatings on medical devices and diagnostic tools.
• Research & Development: A critical reagent in life science research for probing biological processes and developing new assays.

Basic Information

Product Name	Peg21
CAS No.	351342-08-0
Molecular Formula	C42H86O22
Molecular Weight	942.1 g/mol
Synonyms	Polyethylene Glycol 21; PEG 1000 (approx.); α-Hydro-ω-hydroxy-poly(oxy-1,2-ethanediyl) (21 mol EO average molar ratio); 2,2'-(Ethane-1,2-diylbis(oxy))bis(ethane-1,2-diyl) bis(2-(2-(2-hydroxyethoxy)ethoxy)ethyl) ether; 3,6,9,12,15,18,21-Heptaoxatritetracontane-1,41-diol; HO-PEG21-OH; mPEG21; Polyoxyethylene (21) glycol
EINECS	Contact for details

Quality Control

Our Peg21 is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure compliance with high-purity standards for research and pharmaceutical applications. Certificates of Analysis (COA) detailing purity, molecular weight distribution, and impurity profiles are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed under dry conditions to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white waxy solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Average Molecular Weight	950 ± 50 g/mol
Polydispersity Index (PDI)	≤ 1.05
Water Content (KF)	≤ 1.0%
Residual Solvents (GC)	Meets ICH guidelines
Heavy Metals	≤ 10 ppm

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