Anionic emulsifiers are often fatty acids extracted from lignin, tall oil, or tree resin saponified with bases such as NaOH, which creates a negative charge.
ˌænaɪˈɑːnɪk ɪmˈʌlsɪfˌaɪɚz ɑːɹ ˈɔfən fˈæɾi ˈæsɪdz ɛkstɹˈæktᵻd fɹʌm lˈɪɡnɪn, tˈɔːl ˈɔɪl, ɔːɹ tɹˈiː ɹˈɛzɪn sæpˈɑːnᵻfˌaɪd wɪð bˈeɪsᵻz sˈʌtʃ ɐz nˈɑː ˌoʊˈeɪtʃ, wˌɪtʃ kɹiːˈeɪts ɐ nˈɛɡətˌɪv tʃˈɑːɹdʒ.