title: The sonodegradation of caffeic acid under ultrasound treatment: relation to stability.
abstract: The degradation of caffeic acid under ultrasound treatment in a model system was investigated. The type of solvent and temperature were important factors in determining the outcome of the degradation reactions. Liquid height, ultrasonic intensity and duty cycle only affected degradation rate, but did not change the nature of the degradation. The degradation rate of caffeic acid decreased with increasing temperature. Degradation kinetics of caffeic acid under ultrasound fitted a zero-order reaction from -5 to 25 °C. Caffeic acid underwent decomposition and oligomerization reactions under ultrasound. The degradation products were tentatively identified by FT-IR and HPLC-UV-ESIMS to include the corresponding decarboxylation products and their dimers.
authors.affiliation: Department of Food Science and Nutrition, School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yujing
authors.initials: Y
authors.lastname: Sun
authors.forename: Liping
authors.initials: L
authors.lastname: Qiao
authors.forename: Xingqian
authors.initials: X
authors.lastname: Ye
authors.forename: Donghong
authors.initials: D
authors.lastname: Liu
authors.forename: Xianzhong
authors.initials: X
authors.lastname: Zhang
authors.forename: Haizhi
authors.initials: H
authors.lastname: Huang
mesh_terms: D002109:Caffeic Acids / Q000737:chemistry / Q000528:radiation effects*; D002851:Chromatography, High Pressure Liquid; D003653:Decarboxylation; D004355:Drug Stability; D000431:Ethanol / Q000737:chemistry; D007700:Kinetics; D012996:Solutions; D012997:Solvents / Q000737:chemistry; D013010:Sonication; D013016:Sound; D021241:Spectrometry, Mass, Electrospray Ionization; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002109:Caffeic Acids; D012996:Solutions; D012997:Solvents; D000431:Ethanol; C040048:caffeic acid