334 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (a) 2.0 1.5 1.0 0.5 0.0 10 mobile phase 20% methanol O Creatinine A Nicotinamide [-'1 Pyridoxine-HCl I ' I 20 30 40 50 (%) Methanol concentration at ion source I I I I 0 20 50 100 (%) Methanol content in matrix solution added post-column (b) 6O 5O 4O 3O 2O 10 0 10 50 (%) 0 Creatinine /% NicotinamiPyridoxine-HCI I-'1 no si y unstabl[•••• • gnal basel line ver 2O 30 4O Methanol concentration at ion source • I I I 0 -- 2o 5o 100 (%) Methanol content in matrix solution added post-column Figure 2. Effect of methanol content at ion source on (a) relative intensity (20% methanol = 1) and (b) S/N ratio.
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.
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