The present invention relates to a method of stabilizing a surfactant comprising a long alkyl or alkenyl chain comprising adding (a1) a phenolic antioxidant and (a2) an antioxidant. KLYBECKSTRASSE 141 , 4057 BASEL Switzerland CIBA SPECIALITY CHEMICALS HOLDING INC 480/MAS/1999 A 480/MAS/1999 INDIA 2009-03-20T11:37:38Z 2007-02-09 1999-04-26 318980 C 11 D 9/04 NA DIETMAT HUGLIN, ERICH KRAMER, 2095 0 87 EUROPEAN UNION 1998-04-28 98810374.3 2007-02-09 0 1ovAkRoC 2009-04-30T18:40:46Z 87108 DIETMAT HUGLIN, ERICH KRAMER 2340 CIBA SPECIALITY CHEMICALS HOLDING 480/MAS/1999 24872 2007-12-14 210237 CIBA SPECIALITY CHEMICALS HOLDING INC 3opwohQH