2.4.2.2. Neutral lipase activity. The neutral lipase activities were
assayed according to the method of Vestergaard et al. (2000). 0.1ml
of lipase extract was diluted with 2.8 ml of 0.22 M Tris/HCl buffer,
pH 7.5, containing 0.05% (w/v) TritonX-100. 0.1 ml of 1.0 mM 4-
methylumbelliferyl-oleate was added into this mixture as substrate.
After incubation at 37 C for 30min, the samples were
immediately cooled in ice-water mixture and measured at
lex ¼ 328 nm and lem ¼ 443 nm.