TMoisture content was measured by an automatic titrator ZDJ-
400 (Xianqu Weifeng, Beijing, China). Phosphate salts was analyzed
by colorimetric methods (Berenblum and Chain, 1938).
Free-fatty acids were analyzed by a gas chromatograph (Liu
et al., 2013a). Fumaric acid, glucose and glycerol concentrations
were quantified by a high-performance liquid chromatograph
(HPLC) with a Bio-Rad Aminex HPX-87 H ion exclusion column
with a refractive index detector and UV detector at 210 nm. The
column was eluted with 0.005 M H2SO4 at a column temperature