A method is described for the analysis of foods for the forms of vitamin E. Detailed procedures are given for extraction, saponification and partial purification by thin layer chromatography. The individual tocopherols (both tocols and tocotrienols) are identified and estimated as their trimethylsilyl ethers by gas liquid chromatography on SE‐30 or Apiezon L at 235 C. Retention ratios are also given for separations on OV‐17. Response factors relative to didecyl pimelate as an internal standard and overall recoveries were determined for α‐tocopherol, β‐tocopherol, γ‐tocopherol, δ‐tocopherol, β‐tocotrienol and α‐tocotrienol. Sample sizes depended on tocopherol content and were usually chosen to contain 3–50 µg of the individual tocopherols. Data for a number of seeds and oils are given. The greatest variety of forms was found in barley, which contains all the forms listed above, plus γ‐tocotrienol.

The procedures currently used by the U.S. Army Center for Health Promotion and Preventive Medicine (USACHPPM) for the analysis of energetics and related compounds in water and soils are presented. These procedures are based on the use of isoamyl acetate to extract the analytes of interest from their environmental matrices with subsequent analysis using gas chromatography with electron capture detection. The suite of compounds included are those that have been of environmental significance for years (such as 2,4,6-trinitrotoluene, hexahydro-1,3,5-trinitro-1,3,5-triazine, and dinitrotoluenes) and are the subject of several U.S. Environmental Protection Agency SW-846 methods. The procedures presented in this study are the product of years of development and refinement of methods used for the analysis of many real-world samples by the USACHPPM explosives analysis laboratory. The development, performance, advantages, and details of these procedures are described. The extension of these methods to the analysis of other media is also briefly discussed.

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from 1,1,2-trichloroe thane, furfural, butyl mercaptan, and pyridine. The separation of water from the several classes of organic compounds represented by the terpenes together with the compounds mentioned above illustrate the utility of the method described for the analysis of a wide variety of organic compounds.If the compounds of interest in a sample cannot be separated from water using sorbitol, then another preparative column can be used such as purified apiezon L on which water elutes prior to most organic compounds. In general, any preparative column that would provide a significant difference in retention characteristics for a diluent and those compounds of interest may be used with the system.