title: Hemolytic activity and solubilizing capacity of raffinose and melezitose fatty acid monoesters prepared by enzymatic synthesis.
abstract: The hemolytic activity and solubilizing capacity of two families of non-reducing trisaccharide fatty acid monoesters have been studied to assess their usefulness as surfactants for pharmaceutical applications. The carbohydrate-based surfactants investigated included homologous series of raffinose and melezitose monoesters bearing C10 to C18 acyl chains prepared by lipase-catalyzed synthesis in organic media. The hemolytic activity was determined in vitro using a static method based on the addition of the surfactants to an erythrocyte suspension and subsequent spectrophotometric determination of the released hemoglobin. The effect of the carbohydrate head group, the acyl chain length and the regioisomeric purity was investigated. In all cases, the carbohydrate monoester surfactants decreased their hemolytic activity (with respect to their critical micelle concentration) when increasing the length of the acyl chain. A very similar behaviour was observed either the carbohydrate head-group (raffinose and melezitose) or regardless of the regioisomeric purity. Interestingly, decanoyl (C10) and lauroyl (C12) monoesters were just marginally hemolytic at their critical micelle concentrations while the longer palmitoyl (C16) and (C18) stearoyl monoesters become hemolytic at concentrations much higher than their respective cmc. The palmitoyl and stearoyl monoesters also displayed higher solubilization capacity than the shorter acyl chain monoesters in a solubilization assay of a hydrophobic dye as a model drug mimic. These results suggest that raffinose and melezitose monoesters with long-chain fatty acids (C16 to C18) are promising surfactants for pharmaceutical applications and could be an alternative to the use of current commercial nonionic polyoxyethylene-based surfactants in parenteral formulations.
authors.affiliation: Instituto de Parasitología y Biomedicina "López-Neyra", CSIC (IPBLN-CSIC), PTS Granada, Avda. del Conocimiento s/n, 18016 Granada, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Carvalho
authors.affiliation: Instituto de Parasitología y Biomedicina "López-Neyra", CSIC (IPBLN-CSIC), PTS Granada, Avda. del Conocimiento s/n, 18016 Granada, Spain.
authors.forename: Juan C
authors.initials: JC
authors.lastname: Morales
authors.affiliation: Instituto de Parasitología y Biomedicina "López-Neyra", CSIC (IPBLN-CSIC), PTS Granada, Avda. del Conocimiento s/n, 18016 Granada, Spain. Electronic address: josepv@ipb.csic.es.
authors.forename: José M
authors.initials: JM
authors.lastname: Pérez-Victoria
authors.affiliation: Instituto de Parasitología y Biomedicina "López-Neyra", CSIC (IPBLN-CSIC), PTS Granada, Avda. del Conocimiento s/n, 18016 Granada, Spain. Electronic address: ignacio.perez-victoria@medinaandalucia.es.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Pérez-Victoria
mesh_terms: D002241:Carbohydrates / Q000737:chemistry; D002626:Chemistry, Pharmaceutical / Q000379:methods; D004396:Coloring Agents / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry; D006461:Hemolysis / Q000187:drug effects*; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008049:Lipase / Q000378:metabolism; D008823:Micelles; D011887:Raffinose / Q000737:chemistry / Q000494:pharmacology*; D013501:Surface-Active Agents / Q000737:chemistry*; D014312:Trisaccharides / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D002241:Carbohydrates; D004396:Coloring Agents; D005227:Fatty Acids; D008823:Micelles; D013501:Surface-Active Agents; D014312:Trisaccharides; D008049:Lipase; D011887:Raffinose; C005190:melezitose
keywords: Hemolysis; Melezitose monoesters; Raffinose monoesters; Solubilizing agent; Sugar-based surfactants