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SDS^PAGE of proteins was performed in a 12% polyacrylamide
gel by the method of Laemmli . The transformants
of E. coli induced with IPTG were collected by
centrifugation, washed with 50 mM acetate bu¡er (pH
5.5), and then suspended in the sample bu¡er. The lysate
solution was subjected to SDS^PAGE. To detect esterases
including lipases, the gel was soaked at room temperature
in a solution containing 1-naphthylcaprylate instead of 1-
naphthylacetate (Sigma) and Fast Red TR Salt (Aldrich),
and the activity was visualized as a red band .
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