Comments on the Use of this Index

COMMENTS ON THE USE OF THIS INDEX The index which follows is divided into two major sections; the first segment lists antibiotics in alphabetical order. The second segment lists numbered or letter/number combinations of antibiotics so designated in the literature. Antibiotics which have not been assigned names or numbers are listed under the organism from which they were derived. These organisms will be found in the generalized alphabetical sequence. The chromatographic methods for those antibiotics listed are presented in the following order: paper chromatography (PC), thin layer chromatography (TLC), electrophoresis (ELPHO), counter current distribution (CCD),and gas chromatography (GSC, GLC). In numerous instances one or more of the items shown under each heading may have been left blank. This is because either no information regarding the particular feature was presented in the literature or it was not clearly defined. For example, in paper chromatography the type of paper used may not be given. In most instances, it can usually be assumed that a paper such as Whatman No. 1 will suffice and that other substitutes will also be satisfactory. Rf values on other papers may not be identical to those presented in the literature. However, it was felt that in most of these cases enough information could be gleaned t o make the system or systems described of some use in the laboratory. In those techniques where detection methodology is not given, it can usually be assumed that a bioautographic method was used or can be used against a sensitive organism. In many descriptions the Rf values are noted to be estimated. In general these were derived as accurately as possible from photographs, drawings, or graphic reproductions of mobilities as closely as could be determined. In order t o enable comparisons to be made with other chromatographic systems described in the index, it was felt that this data would be more useful rather than to punctuate the text with numerous and varied types of illustrations. Solvent proportions shown in the text are in all instances presumed to be ratios by volume unless otherwise noted. A listing of abbreviations which are used in the index is found on the following pages.