It is known in a general way that acid and alkali are destructive to silk fibroin, but there are only few and scattered data recorded in the literature. In this laboratory, the acid and the alkaline hydrolyses of silk fibroin have been followed by determination of the nitrogen, weight, wet breaking strength and elongation at the breaking load of a degummend silk fabric after treatment for ten hours with sodium hydroxide ranging from 0.0 to 0.5 N at 25° and 40°C., hydrochloric acid of concentrations 0.0 to 2.0 N at 40°C., and with acid and alkali for one hour at 100°C. At 40°C., 0.5 N sodium hydroxide and 2.0 N hydrochloric acid have the same effect upon nitrogen content and weight; breaking strength is decreased 50 percent by 0.03 N sodium hydroxide and by 0.9 N hydrochloric acid.
Proceedings of the Iowa Academy of Science
©1934 Iowa Academy of Science, Inc.
Walde, Eunice and Edgar, Rachel
"The Acid and Alkaline Hydrolyses of silk Fibroin,"
Proceedings of the Iowa Academy of Science, 41(1), 171-172.
Available at: https://scholarworks.uni.edu/pias/vol41/iss1/55