Mgbe emechara ya na mmiri, ọ na-arụ ọrụ elu yana ebubo na-adịghị mma nke a na-akpọ surfactant anionic.
Anionic surfactants bụ ngwaahịa nwere akụkọ ihe mere eme kachasị ogologo, ikike kachasị na ụdị kachasị n'etiti surfactants. A na-ekewa ndị surfactants anionic n'ime sulfonate na alkyl sulfate dị ka usoro nke otu hydrophilic ha si dị, bụ ndị bụ isi ugbu a nke anionic surfactants. Ọrụ dị iche iche nke surfactant bụ nke a na-ahụta okwu n'ịgbanwe njirimara nke elu mmiri mmiri, mmiri mmiri-mmiri interface na mmiri siri ike interface, nke elu (oke) Njirimara nke mmiri mmiri bụ isi ihe.