Nonaethylene glycol monododecyl ether (Nonaoxyethylene monododecyl ether) is a nonionic surfactant and polyethylene glycol (PEG) detergent that can be used to form initial coalesced O/W emulsion droplets, as well as for protein separation and purification^[1][2][3]. In Vitro: Examination of a series of non-ionic PEG detergents with several long-chain E-PDSs from different organisms reveals that in vitro incubations with Nonaethylene glycol monododecyl ether typically gave chain lengths that corresponded to those of the isoprenoid moieties in respiratory quinones synthesized in vivo^[2].