Peptide–Vitamin & Cofactor Conjugates

Peptide–vitamin and peptide–cofactor conjugates are non-drug peptide conjugates in which vitamins or metabolic cofactors are covalently linked to peptide sequences. These constructs are used as research tools to study cellular uptake, nutrient-mediated transport, receptor recognition, and structure–function relationships. ^{[1], [2]}

Unlike peptide–drug conjugates (PDCs), vitamin/cofactor conjugates are designed for analytical and mechanistic investigation rather than therapeutic payload delivery. The vitamin or cofactor functions as a biological ligand or probe, while the peptide provides binding, transport, or scaffolding properties. ^[3]

This page focuses exclusively on non‑drug peptide–small molecule conjugation, where vitamins and cofactors function as biological ligands or probes rather than therapeutic payloads. These constructs are used in analytical, mechanistic, and platform-development research workflows. Bio-Synthesis supports custom peptide–vitamin/cofactor conjugation using site-defined attachment (N-terminus, C-terminus, single-Cys, or handle-enabled options; project-dependent), with purification and fit-for-purpose analytical confirmation to support discovery-stage and preclinical programs.

Bio-Synthesis follows controlled workflows and quality practices aligned with Total Quality Management (TQM). For peptide–vitamin/cofactor conjugates, emphasis is placed on attachment-site control, ligand stability handling, purification strategy, and fit-for-purpose analytical confirmation to support research-stage reproducibility.

• Purity profiling: analytical HPLC/UPLC
• Identity confirmation: LC–MS when feasible
• Reproducibility: site-defined attachment to reduce heterogeneity
• Documentation: COA and method summary aligned to intended use

References are provided for scientific background on vitamins/cofactors and bioconjugation concepts (for context; not clinical claims).

1. Hermanson, G. T. Bioconjugate Techniques, 3rd ed.; Academic Press, 2013. (general conjugation methods; spacer/linker considerations)
2. Hoyt, E. A.; Cal, P. M. S. D.; Oliveira, B. L.; Bernardes, G. J. L. Contemporary approaches to site-selective protein and peptide bioconjugation. Nat. Rev. Chem. 2019, 3, 147–171. DOI
3. Green, N. M. Avidin and streptavidin. Methods Enzymol. 1990. DOI (biotin platform background)
4. Wilchek, M.; Bayer, E. A. The avidin–biotin complex in bioanalytical applications. Anal. Biochem. 1988. DOI