DL-cystine is used in the preparation of sulfur-containing dimeric and monomeric surfactants.
Joseph Wells. Effect of water deprivation on uptake of dl-cystine-S35 in the hypothalamo-hypophysial system. Experimental Neurology. 1963, 8 (6), 470-481.
Célia M C Faustino; António R T Calado; Luís Garcia-Rio; Célia M.C. Faustino; António R.T. Calado; Luís Garcia-Rio. Dimeric and monomeric surfactants derived from sulfur-containing amino acids. Journal of Colloid and Interface Science. 2010, 351 (2), 472-477.