Surface Characteristics of Cotton Fibers , as Indicated by Electrophoretic Studies
نویسنده
چکیده
The surface characteristics of cotton fibers were investigated by a microelectrophoretic t echnique. Samples of dewaxed cotton, cotton which had been depectinized by treatment with a boiling I-percent solution of sodium hydroxide for various lengths of time, and pectic substance from cotton gave widely different pH-mobility curves. The curve for pectic subst ance is characteristic of a highly acidic substance, whereas that for depectinized cotton shows a low order of acidity. The curve for dewaxed cotton appears to be a composite of the curves for cellulose and pectic substance. The purified cellulose exhibits a reversal of charge below pH 2.5, and accordingly is isoelectric at that pH. It is shown that the reversal of charge has not resulted from irreversible changes produced in the fiber during immersion in the dilute solutions of acid used in the present investigation. CONTENTS Page
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