title: Effect of oxyethylene moiety in polyoxyethylene sorbitan esters on the pharmacokinetics of menatetrenone incorporated in O/W lipid emulsions prepared with polyoxyethylene sorbitan esters and soybean oil in rats.
abstract: Oil-in-water (O/W) lipid emulsions are suitable drug carriers for lipophilic drugs; however, the effects of numbers or chains of oxyethylene units within a surfactant molecule such as polyoxyethylene sorbitan esters (PSs) on the biological fate of these lipid emulsions have not yet been clarified. In this study, a series of PSs and soybean oil (SO) were utilized to prepare menatetrenone-incorporated lipid emulsions (SO/PSs), and the biological fate of menatetrenone administered as SO/PSs was studied at a clinical injection volume (0.1 mL kg(-1)) in rats. The plasma concentration and organ uptake of menatetrenone administered as SO/20OE-PSs (PSs with 20 oxyethylene units) was similar to that of SO/egg-yolk phosphatides (SO/EYP). The plasma concentration of menatetrenone was extensively lower for SO/6OE-PSs (PSs with 6 oxyethylene units) and SO/20OE-3FA-PSs (PSs with 20 oxyethylene units and 3 fatty acid chains) than that for SO/EYP, and menatetrenone uptake by the liver and spleen was higher for SO/6OE-PSs and SO/20OE-3FA-PSs, respectively, than those for SO/EYP. Furthermore, menatetrenone uptake by the lungs was also increased for SO/6OE-PS and SO/20OE-3FA-PS with double bonds in the fatty acid moieties of the PSs. These findings suggested that shortening the oxyethylene units or decreasing the oxyethylene chain numbers of emulsifiers resulted in a rapid clearance of the lipid emulsions from the circulation by extensive uptake via the liver, spleen or lungs.
authors.affiliation: Department of Pharmaceutics, Kobe Pharmaceutical University, 4-19-1 Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan.
authors.forename: Kumiko
authors.initials: K
authors.lastname: Ueda
authors.forename: Masanori
authors.initials: M
authors.lastname: Fujimoto
authors.forename: Hiromi
authors.initials: H
authors.lastname: Noto
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Kawaguchi
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Sakaeda
authors.forename: Seigo
authors.initials: S
authors.lastname: Iwakawa
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004655:Emulsions; D005079:Excipients; D006207:Half-Life; D006490:Hemostatics / Q000008:administration & dosage / Q000493:pharmacokinetics*; D007275:Injections, Intravenous; D008297:Male; D008970:Molecular Weight; D010101:Oxygen Consumption / Q000187:drug effects; D010316:Particle Size; D011136:Polysorbates / Q000737:chemistry*; D051381:Rats; D017208:Rats, Wistar; D013024:Soybean Oil; D024482:Vitamin K 2 / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*
chemical_list: D004655:Emulsions; D005079:Excipients; D006490:Hemostatics; D011136:Polysorbates; D024482:Vitamin K 2; C030814:menatetrenone; D013024:Soybean Oil