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Determine the effects of varying sodium chloride concentrations (0% to 12%) and initial pH levels (4.00 to 9.83) on the growth and enterotoxin C production of Staphylococcus aureus strain 137.

May 1, 1971Applied MicrobiologyOpen Access

Effect of Sodium Chloride and p H on Enterotoxin C Production

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Determine the effects of varying sodium chloride concentrations (0% to 12%) and initial pH levels (4.00 to 9.83) on the growth and enterotoxin C production of Staphylococcus aureus strain 137.
Cultured Staphylococcus aureus strain 137 in protein hydrolysate powder broths across NaCl concentrations of 0% to 12% and pH ranges from 4.00 to 9.83 at 37°C for 8 days.
Assayed bacterial growth and enterotoxin C production across different starting inoculum sizes, including 3.6 × 10^6 and ≥10^8 cells per ml.
Permissive pH ranges for enterotoxin C production narrowed as NaCl levels increased, shifting from 4.00–9.83 at 0% NaCl, to 4.40–9.43 at 4% NaCl, 4.50–8.55 at 8% NaCl, and 5.45–7.30 at 10% NaCl with an inoculum of 10^8 cells per ml.
At 10% NaCl with an inoculum of 3.6 × 10^6 cells per ml, the pH range supporting toxin production further restricted to 6.38–7.30.
Enterotoxin C production was undetectable at 12% NaCl across pH 4.50 to 8.55 even when concentrated 14-fold, mirroring the suppressive effect of increasing NaCl on enterotoxin B.

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Implication

Experimental study demonstrates that high sodium chloride levels narrow the permissive pH range for enterotoxin C production in Staphylococcus aureus, indicating salt limits toxin formation.

Cite This Study

Genigeorgis et al. (1971) studied this question.

synapsesocial.com/papers/6a87b8ebe6314279fbfb0848 https://doi.org/10.1128/am.21.5.862-866.1971

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Implication

Experimental study demonstrates that high sodium chloride levels narrow the permissive pH range for enterotoxin C production in Staphylococcus aureus, indicating salt limits toxin formation.

Effect of Sodium Chloride and p H on Enterotoxin C Production

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Discussion

Implication

Cite This Study

Effect of Sodium Chloride and p H on Enterotoxin C Production

Key Points

Discussion

Implication

Cite This Study

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