ANALYSIS OF PARABENS BY LIQUID CHROMATOGRAPHY 383 i I I I 1 2 3 4 I i CARBO-N NUMBER Figure 3. Graph of logarithm of corrected retention vo]u•ne rs. carbon number of ester (retention volume of compound minus retention volume of solvent front, i.e., Vr - Vo)
384 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table I Response Factor Linearity Weight Ratio Weight Ratio Methylparaben Propylparaben -Ethylparaben Response Factor Ethylparaben Response Factor 0.1603 0.942 0.1701 1.06 0.2566 0.920 0.3402 1.09 0.5131 0.912 0.4552 1.09 0.6414 0.933 0.8504 1.04 1.283 0.921 1.2756 1.10 1.924 0.922 2.125 1.07 4.791 0.892 -- -- 1.10 1.00 t_ .90 o .8o o .70 .1C .,. PROPY L METHYL i 0 .50 1.0 1.5 9.0 Wei9h'f Ra-I'io Figure 4. Response factor ]inearity over a range of weight ratios: (X) propylparaben (O) methylparaben
Previous Page Next Page 
Purchased for the exclusive use of nofirst nolast (unknown)
From: SCC Media Library & Resource Center (library.scconline.org)