the surfactants investigated were polyoxyethylene sorbitan monolaurate ( tween 20 ) , polyoxyethylene thioether ( sterox sk ) , mono-calcium salt of polymerized aryl alkyl sulfonic acids ( daxad 21 ) , and alkylbenzyl quaternary ammonium halide ( ahco dd 50 ) .
C0032602
polyoxyethylene sorbitan monolaurate
C0032483
polyoxyethylene