What is Semaglutide?
Semaglutide belongs to the incretin mimetic class. It is built from the native GLP-1 backbone with substitutions that resist cleavage by dipeptidyl peptidase 4, plus a spacer and fatty diacid that bind albumin reversibly and slow clearance. The molecular reference for this catalog lists the formula C187H291N45O59 and an average mass of 4113.58 and records no residue sequence, so none is reproduced here.
In the published preclinical literature, semaglutide is the compound other GLP-1 receptor agonists are benchmarked against. Cell assays use it to characterise receptor binding, cyclic AMP accumulation, and beta arrestin recruitment at the GLP-1 receptor, while rodent work examines food intake, gastric emptying, and glycemic readouts in the animals studied (Knudsen and Lau, 2019). Its long circulating residence makes it a convenient tool for separating acute from sustained receptor engagement.
Several questions remain open. Biased signalling at the GLP-1 receptor is described differently across assay formats, the relative weight of central and peripheral receptor populations in rodent models is debated, and receptor trafficking after prolonged exposure varies between cell lines.
Reconstitution & handling
Sterile or bacteriostatic water is run slowly down the inside wall of the vial so the stream does not strike the powder cake. The lyophilate dissolves with gentle swirling over a minute or so, and vortexing is avoided because acylated peptides foam and shear easily. Concentration follows from dividing labelled mass by diluent volume, so 2 mL into a 5 mg vial gives 2.5 mg per millilitre.
Storage & stability
Unopened lyophilized vials are kept at -20 °C, shielded from light and moisture, and equilibrated to room temperature before the seal is pierced. Reconstituted solution is refrigerated at 2 to 8 °C and divided into single use aliquots. Repeated freezing and thawing promotes aggregation of acylated peptides of this length, and the fatty acid chain drives adsorption onto plastic, so low binding containers are preferred at dilute concentrations.
How it's tested
Every lot is profiled by reversed phase HPLC with detection at 214 and 220 nm, with the main peak reported at 99 percent or greater. Mass spectrometry verifies identity against the theoretical average mass of 4113.58 derived from C187H291N45O59. Net peptide content is determined separately so counter ion and residual moisture are not counted as peptide, and a lot-matched certificate is provided on request.