A substantially revised and updated edition providing current information and recent advances in the field, with the same basic organization as the second edition. Part I contains chapters on the theory, principles, practice, and instrumentation of thin-layer chromatography (TLC). Part II addresses applications of TLC to a variety of compound classes and includes chapters on two new compound classes: hydrocarbons and herbals. Throughout, practical aspects are emphasized. Includes a subject index , an expanded glossary of relevant terms, and a list of sources of supplies and equipment. Intended for use by those in university, government, industrial, and independent testing laboratories that wish to understand and apply the principles of TLC. Of likely utility to chemists, biochemists, biotechnologists, forensic scientists, veterinary toxicologists, pharmaceutical analysts, environmental scientists, and graduate and undergraduate students in those fields.