ANALYSIS OF COSMETIC INGREDIENTS 335 (a) o 30 mobile phase 50% methanol •Z• 0 Pantothe_nyle I I [ ' 40 50 60 Methanol concentration at ion source t I I 25 5O 100 Methanol content in matrix solution added post-column 7 0 (%) (%) 120 (b) z lOO 8o 6o 4o 2o o 3o 0 Pantothenylethylether h Methyl p-hydroxybenzoate I ' I 40 50 60 70 (%) Methanol concentration at ion source 2• 5'0 100 (%) Methanol content in matrix solution added post-column Figure 3. Effect of methanol content at ion source on (a) relative intensity (50% methanol = l) and (b) $/N ratio.
336 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (a) o 50 mobile phase 80% methanol O n-butyl p-hydroxybenzoate A Isopropyl methyl phenol [] 2-Hydroxy-4-methoxybenzophenone I I I 6O 7O 8O Methanol concentration at ion source I I • I 0 50 80•100 Methanol content in matrix solution added post-column 9O (%) (%) (b) z 4O 3O 2O 10 O n-butyl p-hydroxybenzoate /• Isopropyl methyl phenol [] 2-Hydroxy-4-methoxybenzophenone I I I 50 60 70 80 90 (%) Methanol concentration at ion source 50 80 --100 (%) Methanol content in matrix solution added post-column Figure 4. Effect of methanol content at ion source on (a) relative intensity (80% methanol = 1) and (b) S/N ratio.
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