The Textile Fibres; Their Physical, Microscopical, And Chemical Properties
The Textile Fibres; Their Physical, Microscopical, And Chemical Properties
J Merritt Joseph Merritt Matthews
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* Richardson suggests the following structural formula for fibroin, allowing x to represent a hydrocarbon residue: xNH CO^ X( )X. \CO NH/ The decomposition of fibroin by saponification with potash would then be /NH OX ^NH 2 \co NH/ \:O. OK* f Vignon prepared pure fibroin in the following manner: A lo-gram skein of raw white silk is boiled for thirty minutes in a solution of 15 grams of neutral soap in 1500 c. C. Water; rinse in hot, then in tepid water; squeeze and repeat the treatment in a fre...sh soap-bath; rinse with water, then with dilute hydrochloric acid, again with water; finally, wash twice with 90 per cent, alcohol. The fibroin thus obtained leaves only o. Oi per cent, of ash on ignition. (Compt. Rend. , cxv. 17, 613). 88 THE TEXTILE FIBRES. Unlike keratin, the proteoid of wool, fibroin contains no sul- phur, and is much more constant in its composition. The empiri- cal formula for fibroin as given by Mulder is C 15 N 23 N 5 O 6 . Mills and Takamine give the formula as C 24 H 38 N 8 O d, while Schiitzen- berger gives C 71 H 107 N 24 O 25 .
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