Effect of papaya flower ethanolic extract (Carica papaya) on the time kill of tetracyclin against Escherichia coli

Abstract

Papaya (Carica papaya) is found throughout Indonesia. Papaya flowers contain saponin, tannin, alkaloid, and flavonoid compounds which functions as antibacterial. Escherichia coli is a Gram-negative rod bacteria that could be found in the human large intestine as a cause of diarrhea. The study aimed to determine the effect of papaya flower extract and a combination of papaya flower extract with tetracycline antibiotics using the smallest concentration capable of inhibiting 50% of bacterial growth against Escherichia coli bacteria ATCC 25922 using the time-kill test method. This study used the method of Minimum Inhibitory Concentration (MIC) and time-kill. The MIC of the ethanol extract of papaya flower was 2 mg/mL. The time-kill test showed that the death phase was occurred at 4 - 24 hours. The bacteriostatic effect of the extract was obtained at 0 hours to 24 hours, while the antibiotic and its combination with the extracts had a bactericidal effect at 8 hours and 24 hours.

Keywords

• papaya flowers (carica papaya)
• escherichia coli
• mic
• time-kill test