 Two major surfactants, linear alkylbenzene sulfonates (LAS) and the alkyl phenol ethoxylates (APE) break down under aerobic conditions found in sewage treatment plants and in soil to nonylphenol, which is thought to be an endocrine disruptor.Interest in biodegradable surfactants has led to much interest in "biosurfactants" such as those derived from amino acids.Attracting much attention is the non-biodegradability of fluorosurfactant, e.g.