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Determination of Seed-Coat Fragments in Cotton by Solvent-Extraction and Infrared Spectrophotometric Analysis

A method to measure cottenseed oil and oily seed-coat fragments in raw cotton and waste residues has been developed. Carbon tetrachloride is used to extract cottonseed oil from the Shirley analyzer waste of a known amount of cotton or from a waste residue. The amount of cottonseed oil is determined by quantitative infrared analysis, and can be related to seed-coat fragment content. Results of tests on cottons from several ginning studies show that both cottonseed oil content and seed-coat fragment content vary with ginning treatment. Excess cottonseed oil in cotton contributes to sticking problems in yarn manufacturing, with the problem being particularly acute at the card crush rolls.