Table 7. The reaction of α-glucosidase substrates on various media with addition of various iron sources to detect E. sakazakii in FSM 321, 2.43, 2.80, and 2.82
| Oxoid | Oxoid1 | Oxoid2 | OK | VRBG | VRBG1 | NGTE1 | NGTE2 | NGTE | NGTE3 | NGTE4 |
Iron source | FAC | FAC | FE | FC | X | FE | X | FE | FE | FE | FAC |
Carbohydrate | X | X | X | X | Lac | Lac | Glu | X | Glu | Lac | Glu |
α-Glucosidase substrates | Chro | Mug | Mug | Mug | Mug | Mug | Mug | Mug | Mug | Mug | Mug |
FSM321 | − | − | − | − | − | + | + | − | + | + | + |
2.43 | − | + | + | − | − | + | + | + | + | + | + |
2.80 | + | + | + | + | + | − | − | + | − | − | − |
2.82 | + | + | + | + | + | + | − | + | − | + | − |
Oxoid 1 and 2, substitution by α-MUG or iron source in Oxoid.
VRBG 1, substitution by iron source in VRBG.
NGTE 1, 2, 3, and 4: substitution by iron source or carbohydrate in NGTE.
FAC, ferric ammonium citrate; FC, ferric citrate; FE, ferrioxamine E.
Chro, 5-bromo-4-chloro-3-indolyl-α-D-glucopyranoside (BCIG).
Mug, 4-methyl-umbelliferyl α-D-glucoside (α-MUG).
X, blank; Lac, lactose; Glu, glucose.
+, positive of α-glucosidase substrates; −, negative of α-glucosidase substrates.