تفاعل #350557
ord-eb280669c71847b59bf6ce4570e27668
معادلة التفاعل
ONPG
lactose
ONPG
→
indole
ظروف التفاعل
الظروف التفصيلية
See reaction.notes.procedure_details.
المعالجة
- 1أخرىAt 44.5° C
الإجراء التجريبي
Principle of Step 1: ONPG substituting for lactose is metabolized with β-galactosidase. At 44.5° C. E. coli grow and utilize ONPG and produce indole. β-galactoside turns the medium yellow. In the yellow colored medium, both fecal coliforms and E. coli are present. In samples which do not have a yellow color, there are no fecal coliforms and E. coli.