Materials
Lipase Novozyme 435, Lipozyme 435, Lipozyme TLIM, Lipozyme RMIM, donated by Aarhus University, Denmark. Chemical reagents, including glycerol, caffeic acid (CA), ferulic acid (FA), p -hydroxycinnamic acid (p -HCA), ethyl acetate, chloroform, methanol, toluene, glacial acetic acid, anhydrous ethanol and DPPH were purchased from Aladdin reagent (Shanghai, China). All solvents for HPLC analysis were purchased from Sigma-Aldrich.