For many years TLC has suffered from the image of being a low sensitivity, low resolution, non-quantitative teehnique, suitable for chemists, but not a tool for real ehromatographers. Whilst perhaps true in the past this attitude no longer ref1eets the eapabi1ities of modern instrumenta1ized TLC in all its many forms. This volume represents the proceedings of a meeting in Brighton in 1987 whieh formed part of a eontinuing series of one and two day events on TLC organized by the Chromatographie Soeiety either alone or, like this one, in eonjunetion with other learned bodies. These meetings are designed to keep ehromatographers up to date with the latest deve10pments and help promote a more positive image of TLC. lan Wilson November 1987 v CONTENTS The Chromatographic Society xi Contemporary Thin-layer Chromatography: An introduction IoD. Wilson INSTRUMENTATION Quantitative Methods in Thin-layer Chromatography C. F. Poole, S. K. Poole and T. A. Dean 11 Fluorescence Line-narrowing Spectroscopy: A New and Highly Selective Detection Technique for Thin-layer and Liquid Chromatography J. W. Hofstraat, C. Gooijer, U. A. Th. Brinkman and N. H. Velthorst 29 Qualitative and Quantitative Image Analysis of Fluorescence from High Performance Thi. n-layer Chromatography R. M. Belchamber, S. J. Brinkworth, H. Read and J. D. M. Roberts 37 Analytical Rotation Planar Chromatography Sz. Nyiredy, K. Dallenbach-Toelke and O. Sticher 45 Analytical and Preparative Overpressured Layer Chromatography E. Mincsovics and E. Tyihak 57 Anticircular Planar Chromatography: Analytical and Preparative Aspects H. Traitler and A.

This volume represents the proceedings of an international symposium on sample preparation, held at the University of Surrey, and jointly organised by the Chromatographic Society and the Robens Institute. The Chromatographic Society is the only international organisation devoted to the promotion of, and the exchange of information on, all aspects of chromatography and related techniques. With the introduction of gas chromatography in 1952, the Hydrocarbon Chemistry Panel of the Hydrocarbon Research Group of the Institute of Petroleum, recognising the potential of this new technique, set up a Committee under Dr S.F. Birch to organise a symposium on "Vapor Phase Chromatography" which was held in London in June 1956. Almost 400 delegates attended this meeting and success exceeded all expectation. It was to afford discussion of immediately apparent that there was a need for an organised forum development and application of the method and, by the end of the year, the Gas Chromatog raphy Discussion Group had been formed under the Chairmanship of Dr A.T. James with D.H. Desty as Secretary. Membership of this Group was originally by invitation only, but in deference to popular demand, the Group was opened to all willing to pay the modest sub scription of one guinea and in 1957 A.J.P. Martin, Nobel Laureate, was elected inaugural Chairman of the newly-expanded Discussion Group."

The connection between the study of insects. their development. behaviour and biochemistry. and chromatography is perhaps not immediately obvious. However. this connection exists and it is of fundamental importance to our understanding of many areas of insect physiology. Insects range in size from small to minute and consequently the amounts of hormones or pheromones they produce are equally minute. Ultimately any attempt at understanding the processes which control development, social behaviour or the biochemistry of insects requires some means of isolating the tiny quantities of the hormones and pheromones responsible in sufficient quantity and purity for identification. The ability to devise novel techniques to separate these materials from frequently complex biological mixtures including precursors and metabolites and to devise detection systems for them is vital. Methods for the quantification of these substances at different stages in the life cycle. or in response to environmental change or stress. are then essential. Chromatography. both as a means for isolation and as a method for quantitative analysis. has "been an essential tool in these studies. This volume represents the outcome of a joint international symposium organized by the Chromatographic and Royal Entomological Societies at the University of Reading between the 21st and 23rd March 1989 aimed specifically at discussing the chromatography and isolation of insect hormones. pheromones and related substances.The papers presented at that meeting. and collected together here. covered many aspects of the subject including the chromatography of juvenile hormones. ecdysteroids. peptides. pheromones and semio chemicals."

This volume represents the proceedings of a two-day international meeting on chiral chromatography held at the University of Surrey between 3-4 September 1987. The meeting was jointly organized by the Chromatographic SOCiety and the Robens Institute of the University of Surrey in response to the burgeoning interest in this rapid maturing field of chromatography. Nowhere is this interest more evident than in the agrochemical and pharmaceutical industries where the implications of different pharmacological and toxicological activity for the individual enantiomers present in a racemic drug ol" insecticide is an increasing area of concern. Developments in the area of chiral separations are at last beginning to provide SCientists with the necessary tools to study how animals and man handle racemates and relate their obseIVations to the obseIVed biological effects of these substances. The development of robust and Simple methods for the separation of enantiomers will therefore have a profound Impact on safety evaluation and drug design. The meeting proved to be very successful. with over 160 delegates from thirteen countries in Europe and America present to learn from the experiences of experts in the field of chiral chromatography and to hear about the latest developments. Hopefully. in future symposia on chiral separations at the University of Surrey.

This volume represents the proceedings of the second international meeting on chiral separations held at the University of Surrey between the 12th and 15th of September 1989. Like the preceding meeting, it was jointly organised by the Chromatographic Society and the Robens Institute of the University of Surrey in response to the continued interest in this area of separation science. Of particular interest to the organisers was the very clear change in the nature of the delegates attending this second symposium as compared with the first. At the previous meeting the majority of the delegates were composed of chromatographers with problems in the area of chiral separations who were keen to learn as much as possible about these techniques from the handful of recognised experts in this area. In this second symposium the divide between expert and novice was much less apparent, with the latter providing many interesting and useful contributions to the scientific programme in termt; of both oral and poster presentations.

This volume represents the proceedings of an international symposium on sample preparation, held at the University of Surrey, and jointly organised by the Chromatographic Society and the Robens Institute. The Chromatographic Society is the only international organisation devoted to the promotion of, and the exchange of information on, all aspects of chromatography and related techniques. With the introduction of gas chromatography in 1952, the Hydrocarbon Chemistry Panel of the Hydrocarbon Research Group of the Institute of Petroleum, recognising the potential of this new technique, set up a Committee under Dr S.F. Birch to organise a symposium on "Vapor Phase Chromatography" which was held in London in June 1956. Almost 400 delegates attended this meeting and success exceeded all expectation. It was to afford discussion of immediately apparent that there was a need for an organised forum development and application of the method and, by the end of the year, the Gas Chromatog raphy Discussion Group had been formed under the Chairmanship of Dr A.T. James with D.H. Desty as Secretary. Membership of this Group was originally by invitation only, but in deference to popular demand, the Group was opened to all willing to pay the modest sub scription of one guinea and in 1957 A.J.P. Martin, Nobel Laureate, was elected inaugural Chairman of the newly-expanded Discussion Group."

For many years TLC has suffered from the image of being a low sensitivity, low resolution, non-quantitative teehnique, suitable for chemists, but not a tool for real ehromatographers. Whilst perhaps true in the past this attitude no longer ref1eets the eapabi1ities of modern instrumenta1ized TLC in all its many forms. This volume represents the proceedings of a meeting in Brighton in 1987 whieh formed part of a eontinuing series of one and two day events on TLC organized by the Chromatographie Soeiety either alone or, like this one, in eonjunetion with other learned bodies. These meetings are designed to keep ehromatographers up to date with the latest deve10pments and help promote a more positive image of TLC. lan Wilson November 1987 v CONTENTS The Chromatographic Society xi Contemporary Thin-layer Chromatography: An introduction IoD. Wilson INSTRUMENTATION Quantitative Methods in Thin-layer Chromatography C. F. Poole, S. K. Poole and T. A. Dean 11 Fluorescence Line-narrowing Spectroscopy: A New and Highly Selective Detection Technique for Thin-layer and Liquid Chromatography J. W. Hofstraat, C. Gooijer, U. A. Th. Brinkman and N. H. Velthorst 29 Qualitative and Quantitative Image Analysis of Fluorescence from High Performance Thi. n-layer Chromatography R. M. Belchamber, S. J. Brinkworth, H. Read and J. D. M. Roberts 37 Analytical Rotation Planar Chromatography Sz. Nyiredy, K. Dallenbach-Toelke and O. Sticher 45 Analytical and Preparative Overpressured Layer Chromatography E. Mincsovics and E. Tyihak 57 Anticircular Planar Chromatography: Analytical and Preparative Aspects H. Traitler and A.