I am trying to modify the Liposomal drug surface, when I tried using DSPE-PEG-Mal 2000 the binding results onto LipoDox the SDS-PAGE and Western Blot results show that very low signal, which means the binding between LipoDox and 2000 wasn't good enough compared to 3400 Maleimide. Or the 3400 is more stable compared to 2000?