O surfactants bipolar o surfactants ia e iai vaega hydrophilic anionic ma cationic.

I se tulaga lautele, o amphoteric surfactants o ni vailaʻau ia e iai ni vaega hydrophilic se lua i totonu o le molecule lava e tasi, e aofia ai vaega hydrophilic anionic, cationic, ma nonionic. O amphoteric surfactants e masani ona faʻaaogaina o le tele lava o vaega hydrophilic ma le ammonium poʻo le quaternary ammonium salts i le vaega cationic ma le carboxylate, sulfonate, ma le phosphate ituaiga i le vaega anionic. Mo se faʻataʻitaʻiga, o amino acid amphoteric surfactants ma amino ma vaega vaega i le molecule lava e tasi o betaine amphoteric surfactants e faia mai masima i totonu o loʻo iai vaega quaternary ammonium ma carboxyl, faʻatasi ai ma le tele o ituaiga.

O le faʻaalia o amphiphilic surfactants e fesuisuiaʻi e tusa ai ma le tau o le pH o la latou fofo.

Fa'aalia o meatotino o cationic surfactants i ala oona; Fa'aalia o meatotino o anionic surfactants i ala oona alkaline; Fa'aalia o meatotino o non-ionic surfactants i ala oona neutral. O le tulaga e paleni lelei ai meatotino cationic ma anionic e ta'ua o le isoelectric point.

I le tulaga isoelectric, o nisi taimi e fa'aputu ai amino acid amphoteric surfactants, ae o betaine type surfactants e le faigofie ona fa'aputu e tusa lava pe i le tulaga isoelectric.

Ituaiga BetaineSa muamua fa'avasegaina surfactants o ni quaternary ammonium salt compounds, ae e le pei o quaternary ammonium salts, e leai ni a latou anions.
E faatumauina e le Betaine lona molecular positive charge ma ona uiga cationic i totonu o mea e 'acid' ma alkaline. E le mafai e lenei ituaiga surfactant ona maua ni charge lelei pe leaga. E fa'atatau i le pH o le vai o lenei ituaiga o mea e fa'afefiloi, e talafeagai ona fa'avasegaina sese o se amphoteric surfactant.

E tusa ai ma lenei finauga, e tatau ona fa'avasegaina vaila'au betaine o ni cationic surfactants. E ui i nei finauga, o le to'atele o tagata e fa'aogaina vaila'au betaine o lo'o fa'aauau pea ona fa'avasegaina i latou o ni vaila'au amphoteric. I le vaega o le heteroelectricity, e iai se fausaga biphasic i le gaioiga o luga: R-N+(CH3) 2-CH2-COO -.

O le faʻataʻitaʻiga sili ona taatele o betaine type surfactants o le alkylbetaine, ma o lona oloa fa'atusa o le N-dodecyl-N, N-dimethyl-N-carboxyl betaine [BS-12, Cl2H25-N+(CH3) 2-CH2COO -]. O le Betaine fa'atasi ai ma vaega amide [Cl2H25 i le fausaga ua suia e le R-CONH - (CH2) 3-] e sili atu lona fa'atinoga.

E le afaina le ma'a'a o le vaibetainesurfactant. E maua ai le foam lelei ma le mautu lelei i vai vaivai ma vai malo. I le fa'aopoopoga i le fa'afefiloi ma anionic compounds i tau pH maualalo, e mafai fo'i ona fa'aogaina fa'atasi ma anionic ma cationic surfactants. E ala i le tu'ufa'atasia o betaine ma anionic surfactants, e mafai ona ausia ai le viscosity lelei atoatoa.