The Infrared Absorption Spectra of Some Mono-unsaturated and Saturated Fatty Acids and Esters.

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Abstract
Infrared spectra (from 600 to 4000 cm-1) of 43 different fatty acids and fatty acid esters in carbon disulphide solution have been recorded. Main stress has been laid on the study of the trans absorption at 962 cm-1 , and extinction coefficients of the pure substances at the trans maximum have been calculated. Beer''s law has been shown to apply for concentrations upto 200 g substance per liter of solution. Mention is further made of a base line method for quantitative determination of trans monoene fatty acids in mixtures with saturated acids and cis forms of unsaturated fatty acids and fatty acid esters. Ten of the recorded infrared spectra are reproduced.

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