124 JOURNAL OF COSMETIC SCIENCE 600 • • 500 • GLYCOLIC ACID-TMS 400 • LACTIC ACID-TMS •' 300 J SALICYLIC ACID-TMS • 20O • A i i • I• 1•o 112 ' ' mi• pA 160 _ 140 - 120 • • 4004 • GLYCOLIC ACID-TMS 80 - LACTIC ACID-TM, • J SALICYLIC ACID-TMS 60_ ' •/ • 40- • m •. ß • o- ' • • ..... B i • • • 1• 1•2 ' mir Figure 1. Typical capillary gas chromatograms of: (A) silylated standard hydroxy acid mix and (B) silylated hydroxy acid-containing personal care product. UNEARITY 1200 1000 800 •00 400 200 0 ' 0 100 200 300 Concentration 400 Glycolic acid Lactic acid Salicylic acid Figure 2. Linearity.

DETERMINATION OF HYDROXY ACIDS 125

Purchased for the exclusive use of nofirst nolast (unknown)
From: SCC Media Library & Resource Center (library.scconline.org)