chapter  36
16 Pages

Quality Control of Ultraviolet Filters

Introduction 736

FDA Approved Category I UV Filters 736

Quality Control Procedures 737

Physical Analyses 737

Odor 737

Color 737

Physical Appearance 738

Melting Point 738

Refractive Index 738

Specific Gravity 738

Optical Rotation 738

Solubility 739

Moisture Determination 739

Viscosity 739

pH Determination 739

Flash Point 739

Chemical Analyses 739

Saponification Value 739

Acid Value 740

Functional Group Analysis 740

Metal Contents 740

Chromatographic Techniques 740

Gas Chromatography 740

High-Performance Liquid Chromatography 741

Spectroscopic Techniques 742

Ultraviolet Spectroscopy 742

Nuclear Magnetic Resonance Spectroscopy 744

Infrared Spectroscopy 745

Mass Spectrometry 746

Atomic Absorption and Emission Spectroscopy 747

Inductively Coupled Plasma 747

Conclusions 748

References 748

INTRODUCTION

The recent rapid growth of the sunscreen market reflects increased consumer

awareness concerning the protection against excessive exposure to the sun’s

damaging ultraviolet (UV) rays (this volume, chapters by Nelson and Diffey).

This large-scale introduction of UV filters into a multitude of cosmetic and

toiletry products has complicated the task of the quality control chemist.