Table 2 Correlations of physiological parameters in nitrate condition after 5 h and 9 h (n = 12).

From: Nitrate as a potential prebiotic for the oral microbiome

Nitrate condition

Nitrate condition

Nitrate (mg/L)a

Nitrite (mg/L)a

Ammonium (mg/L)

Lactate (mg/L)

pH

5 h

5 h

5 h

9 h

5 h

9 h

5 h

9 h

Nitrate (mg/L)a

5 h

1.000

0.322

− 0.717**

− 0.530

0.405

0.711**

− 0.336

− 0.016

Nitrite (mg/L)a

5 h

0.322

1.000

− 0.641*

− 0.528

0.655*

0.578*

− 0.822***

− 0.394

Ammonium (mg/L)

5 h

− 0.717**

− 0.641*

1.000

0.888***

− 0.573

− 0.694*

0.651*

0.035

9 h

− 0.530

− 0.528

0.888***

1.000

− 0.594*

− 0.708*

0.641*

0.091

Lactate (mg/L)

5 h

0.405

0.655*

− 0.573

− 0.594*

1.000

0.753***

− 0.571

− 0.308

9 h

0.711**

0.578*

− 0.694*

− 0.708*

0.753***

1.000

− 0.461

− 0.070

pH

5 h

− 0.336

− 0.822***

0.651*

0.641*

− 0.571

− 0.461

1.000

0.588*

9 h

− 0.016

− 0.394

0.035

0.091

− 0.308

− 0.070

0.588*

1.000

  1. aAfter 9 h, there was no nitrate and nitrite detected in supernatants of 12/12 and 9/12 donors, respectively.
  2. *p < 0.05, **p < 0.01, ***p < 0.005.
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