ADC payload and linker chemistry

The synthesis of cytotoxic payloads and linker systems demands chemically precise reagents capable of supporting reactive functional group chemistry under controlled conditions. From reductive amination and thiol alkylation to click chemistry conjugation, each step requires materials that perform consistently and meet the purity standards expected in ADC development. 

Find reagents for the ADC payload and linker chemistry workflow stage.

• Amino acids for conjugation chemistry
• Biological buffers for linker and payload activation
• Crosslinking reagents for linker-payload coupling
• Dendrimers for drug delivery
• PEGs for linker-payload constructs

Amino acids for conjugation chemistry

Cysteine and lysine residues are the primary conjugation sites in ADC development. High-purity amino acids support site-directed modification chemistry, enabling selective attachment of linker-payload constructs and contributing to a homogeneous drug-to-antibody ratio (DAR).

Biological buffers for linker and payload activation

Controlled pH during linker activation and payload functionalization prevents premature hydrolysis of reactive groups and ensures reaction selectivity. Biological buffers with defined buffering capacity maintain consistent conditions throughout, protecting reactive intermediates and supporting reproducible outcomes. 

Crosslinking reagents for linker-payload coupling

Crosslinking reagents bearing NHS esters, azides, or maleimide groups enable covalent attachment between linker and payload moieties. Selecting reagents with appropriate spacer length, solubility, and reactivity supports efficient coupling and minimizes non-specific interactions in the final conjugate.

Dendrimers for drug delivery

Dendrimers serve as versatile scaffolds for multi-payload delivery in ADC research, offering defined molecular architecture, tunable surface chemistry, and improved aqueous solubility. Their branched structure enables precise drug loading and reduced non-specific binding, making them relevant for exploring alternative conjugation platforms and linker design strategies.

Discover our entire selection of dendrimers.

PEGs for linker-payload constructs

PEG spacers are a standard component of ADC linker design, improving the aqueous solubility of hydrophobic payloads and increasing the distance between antibody and cytotoxin to preserve antigen-binding affinity. PEG incorporation also reduces aggregation propensity and can extend systemic circulation half-life. 

Click here to discover more PEGs.