Sodium azide can interfere during the conjugation reaction. We recommend a maximum concentration of 0.1% sodium azide. Nevertheless, sodium azide is known as an irreversible inhibitor of HRP. We do not recommend performing a HRP conjugation in presence of sodium azide or adding sodium azide with your HRP conjugated antibody. Additionally sodium azide should be avoided whenever possible and removed using one of our purification kits to ensure the highest possible quality conjugates.
Souce: NovoPro 2018-03-16