286 w u 2,5 � 1,5 0 U) 0,5 200 a 2,5 � 1.5 a:: 0 U) b C 0 U) 0.5 200 2.5 1.5 0,5 200 220 220 220 JOURNAL OF COSMETIC SCIENCE 240 260 240 260 PG t 240 260 280 300 A.[nm] 280 300 A.[nm] AAPG 280 300 "-[nm] 320 320 340 360 380 MICELLAR SOLUTION: SDS 6%, WATER 94% 340 -l=7days ��t=15days t = 29days 360 380 0/W MICROEMULSION: SDS 6%, PENTANOL 5%, WATER 89% -t=Ohrs -t=1hrs -t=2hrs -tc::3hrs -t=4hrs -t=12hrs -t=20hrs ·-O•�Rt=4 days 320 340 360 380 40( 400 400

w 2.5 � 1.5 · U) III ( d w 05 200 2.5 � 1.5 0 U) III ( e 0.5 200 2.5 � 1.5 1 0.5 200 220 240 260 1 220 240 260 AA 220 240 260 AAPG BlCONTINUOUS SYSTEM: SOS 6%, PENTANOL 22%, WATER 72% -t=Ohrs -t=1hrs -t=2hrs -t=:3hrs -t=15days t=42days 280 300 320 340 360 380 AAPG 280 280 A.[nm] W/O MICROEMULSION: SOS 6%, PENTANOL 75%, WATER 19% 300 A.[nm] 300 1'.[nm] 320 340 -t=Ohrs -t=2hrs ___,__l=4hrs -1=12hrs --t=8days t=21days t=49days 360 380 PENT ANOL 10%, WATER 90% -l =Sdays --···---t = 18days -�~-t =32days 320 340 360 380 400 400 400 Figure 2. (a) 0.002 wt% propyl gallate and 0.002 wt% ascorbic acid decomposition in water. (b) 0.002 wt% propyl gallate and 0.002 wt% ascorbic acid decomposition in the 6% SDS/94% water system. (c) 0.002 wt% propyl gallate and 0.002 wt% ascorbic acid decomposition in the 6% SDS/5% pentanol/89% water system (0/W microemulsion). (d) 0.002 wt% propyl gallate and 0.002 wt% ascorbic acid decomposition in the 6% SDS/22% pentanol/72% water system (bicontinuous microemulsion). (e) 0.002 wt% propyl gallate and 0.002 wt% ascorbic acid decomposition in the 6% SDS/75% pentanol/19% water system (W/0 microemulsion). (f) 0.002 wt% propyl gallate and 0.002 wt% ascorbic acid decomposition in the 10% pentanol/90% water system.