Fig. 6

DNA damage inhibition activities at 2 μL (a) and 4 μL (b) of the 48-h culture supernatants. Lane 1: positive control; lane 2: negative control; lane 3–4: batch culture supernatants with 2.5 and 5 μL of Fenton’s reagents, respectively; and lane 5–6: fed-batch supernatants with 2.5 and 5 μL of Fenton’s reagents, respectively