2.8.4. Amylase production
Amylase activity was assayed at pH 5.0 according to the DNS
procedure (Bernfeld, 1955) the use of 1.0% (w/V) soluble starch as
substrate for 15 min at 55 C. Maltose was used as standard. One
unit of a-amylase activity (U mL1) was defined as the amount of
enzyme required to produce 1 mmol of maltose in 1 min at 55 C.
Specific amylase activity (U mg1) was expressed as 1 U per 1mg of
protein present in the FE.
The amylase zymogram was prepared in an electrophoresis gel
as described in (Dojnov and Vujcic, 2012) after protein separation
by IEF, which was performed as described in Section 2.8.1.