Butyl-Dependant Hydrophobic Interaction Liquid Chromatography: A Technique to Characterize Antibody-Drug Conjugates Based on Hydrophobic Interactions

0 weergaven3:46 min • July 8th, 2025

Antibody-drug conjugates - ADCs - are formed by attaching a target-specific monoclonal antibody with cytotoxic drugs via suitable linkers. The stochastic conjugation process creates ADCs with different numbers of drug moieties.

The ADC species are characterized by their drug-to-antibody ratio or DAR, which determines their therapeutic efficacy. The hydrophobicity of ADCs makes them suitable candidates for hydrophobic interaction liquid chromatography or HIC-based characterization.

To begin, assemble a chromatography column containing an agarose matrix-based stationary phase. The matrix is cross-linked to butyl moieties - the hydrophobic alkyl functional groups.  Equilibrate the column with a high salt binding buffer. Follow it by loading the ADC solution onto the column.

Salt ions in the buffer displace water molecules around ADCs, exposing their hydrophobic regions. This enables ADCs to bind to the butyl ligands via hydrophobic interactions. ADCs with a higher number of bound drug moieties show stronger interaction with the column.

Slowly replace the high salt buffer with the elution buffer having a low salt concentration. This process of progressively decreasing the salt concentration is termed as gradient elution.

The decrease in salt ions re-enables water molecules to surround ADCs, disrupting their interaction with ligands. ADCs with the lowest number of bound drug moieties are eluted first, followed by species with higher DAR.

Monitor the elution to characterize the ADCs according to their DAR.

To analyze the conjugate, equilibrate the HPLC-HIC column with 100% high-salt buffer for 5 minutes. Then, mix 15 microliters of a 1 mg/mL solution of trastuzumab linked to MMAE, with 15 microliters of 2X high-salt buffer in a vial. Inject the mixture onto the HPLC column. Elute in an isocratic 1 mL/min flow with 100% high-salt buffer for one minute.

Follow this with a 15-minute gradient from 100% to 0% of high-salt buffer in low-salt buffer. Monitor the elution at 280 nanometers. Integrate the peaks on the chromatogram with retention times of 7.5, 9.2, and 11.5 minutes, which correspond to trastuzumab with zero, one, and two conjugated toxins respectively.

Now, calculate the DAR by adding up the areas of the peaks at 9.2 minutes, which has a weight of 1, and 10.5 minutes, which has a weight of 2, and divide by the total area of the three peaks.

09:06

Efficiënt en Site-specifiek antilichaam Labeling by-stam bevorderde azide-alkyn Cycloadditiereacties

Gerelateerde video's

0 Bekeken

08:53

In vivo immunofluorescentie lokalisatie voor de beoordeling van therapeutische en diagnostische antilichamen Biodistribution in kankeronderzoek

Gerelateerde video's

0 Bekeken

12:55

Zuivering van de menselijke S100A12 en de ionen-geïnduceerde oligomeren voor Immuuncelstimulatie

Gerelateerde video's

0 Bekeken

10:21

Geautomatiseerde hydrofobe interactiechromatografie Kolomselectieopties voor gebruik in Protein Purification

Gerelateerde video's

0 Bekeken

03:22

Calcium-Dependent Hydrophobic Interaction Chromatography: A Technique to Purify Calcium-Binding Proteins Based on Hydrophobic Interactions

Gerelateerde video's

0 Bekeken

03:07

Hydrophilic Interaction Liquid Chromatography: A Technique to Separate Hydrophilic Polar Analytes Using Hydrophilic Beads

Gerelateerde video's

0 Bekeken

14:53

Capillaire Elektroforese Scheiding van monoklonaal antilichaam isovormen gebruiken een neutrale capillair

Gerelateerde video's

0 Bekeken

15:27

Bepaling van antilichaam met hoge affiniteit antigeen-bindend Kinetics met behulp van vier Biosensor Platforms

Gerelateerde video's

0 Bekeken

08:58

Karakterisering van glycoproteïnen met de vouw van de immunoglobuline door middel van röntgendiffractie en biofysische technieken

Gerelateerde video's

0 Bekeken

08:07

Analyse van DNA-eiwitinteracties met op streptavidine gebaseerde biolaaginterferometrie

Gerelateerde video's

0 Bekeken

Laatst bijgewerkt: 29 augustus 2026