The pH of the solution was recorded using a digital pH meter (Model PHS-3C; CD Instruments, China). Ash, moisture, total sugar and protein contents of the samples were determined according to standard methods (Hou, 2004).
The pH of the solution was recorded using a digital pH meter (Model PHS-3C; CD Instruments, China). Ash, moisture, total sugar and protein contents of the samples were determined according to standard methods (Hou, 2004).