Charge and zeta-potential distribution in starch modified with octenyl succinic anhydride (OSA) determined using electrical asymmetrical flow field-flow fractionation (EAF4)
Starch modified with octenyl succinic anhydride (OSA) is extensively used due to its emulsifying capacity. Modification with OSA renders the starch surface active but also anionic at intermediate pH. The amount of OSA that is grafted to the starch polymer backbone will influence the functionality. Likewise, it can be expected that the distribution of the substituents over the molar mass distributi