Abstract
The foaming components were fractionated from keratin hydrolysate by membrane ultrafiltration. Molecluar weights, surface tensions, foam heights, and foam stabilities of the above fractions were determined. The molecular weight range of the main foaming components was estimated to be from 1.0×104 to 5.0×103 by means of membrane ultrafiltration. Fractions were subject to gel filtration using TSK-Gel G3000SW and G2000SW in order to check the molecular weight ranges of the membrane ultrafiltrates. The molecular weight of the most abundant component of each fraction was found to correspond well to the molecular weight of the component fractionated by the membrane except those of the molecular weight below 10, 000.
