title: Microencapsulation of essential oil for insect repellent in food packaging system.
abstract: Microcapsules containing thyme oil were prepared by in situ polymerization, using melamine-formaldehyde prepolymer as a wall material and 3 different emulsifiers (pluronic F-127, tween 80, and sodium lauryl sulfate [SLS]). The general characteristics and release behavior of microcapsules, and their repellent effect against insects were investigated. The morphology of microcapsules using SLS was spherical shape with smooth surface. Microcapsules began to degrade at 150 °C. The particle size ranged from 1 to 10 μm and the loading efficiency of thyme oil was clearly affected by the emulsifier type. The highest loading efficiency appeared in microcapsules using SLS, which have good thermal resistance and smooth surface. The release rate of thyme oil from microcapsules was not only dependent on the storage temperature but also emulsifier type and microcapsules showed the sustained release properties for a long time. Diets, which were mixed with encapsulated thyme oil, expressed high insect repellent efficacy over 90% for 4 wk.
authors.affiliation: School of Life Sciences and Biotechnology, Korea Univ., 5-Ka, Anam-Dong, Sungbuk-Ku, Seoul, 136-701, Republic of Korea.
authors.forename: Seong Kyun
authors.initials: SK
authors.lastname: Chung
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Seo
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Lim
authors.forename: Hyung Hwan
authors.initials: HH
authors.lastname: Park
authors.forename: Myeong Jai
authors.initials: MJ
authors.lastname: Yea
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Park
mesh_terms: D000818:Animals; D002214:Capsules; D045703:Emulsifying Agents / Q000032:analysis / Q000737:chemistry; D018857:Food Packaging / Q000379:methods*; D007302:Insect Repellents / Q000494:pharmacology*; D007313:Insecta / Q000187:drug effects; D009822:Oils, Volatile / Q000494:pharmacology*; D010938:Plant Oils / Q000032:analysis / Q000737:chemistry; D020442:Poloxamer / Q000032:analysis / Q000737:chemistry; D011136:Polysorbates / Q000032:analysis / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000032:analysis / Q000737:chemistry; D046930:Thymus Plant / Q000737:chemistry
chemical_list: D002214:Capsules; D045703:Emulsifying Agents; D007302:Insect Repellents; D009822:Oils, Volatile; D010938:Plant Oils; D011136:Polysorbates; D020442:Poloxamer; D012967:Sodium Dodecyl Sulfate