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Food PH

Reference data and engineering information about food ph for food and bio applications.

food

Overview

Engineering reference data for Food PH in food bio.

Key Formulas

pH

pH=−log⁡10[H+]pH = -\log_{10}[H^+]

Measure of acidity in food.

Water Activity

aw=PP0a_w = \frac{P}{P_0}

Ratio of vapor pressure of food to pure water.

Thermal Death Time

log⁡N0N=tD\log\frac{N_0}{N} = \frac{t}{D}

Microbial reduction during heating.

Q10 Temperature Coefficient

Q10=(k2k1)10/(T2−T1)Q_{10} = \left(\frac{k_2}{k_1}\right)^{10/(T_2-T_1)}

Rate change per 10°C temperature increase.

Variables

Symbol Description Unit
pHpH Acidity level —
awa_w Water activity —
NN Microbial count CFU
DD Decimal reduction time min
Q10Q_{10} Temperature coefficient —

Food pH Reference Table

Key Observations

Food pH ranges from highly acidic (like limes at 1.8-2.0) to mildly alkaline (like eggs at 7.6-8.0). Most fruits and fermented products are acidic (pH < 4.6), while most vegetables, meats, and dairy products are mildly acidic to neutral (pH 4.6-7.0).

Important consideration: Significant variation exists in pH values based on:

  • Plant variety and cultivar
  • Growing conditions and soil composition
  • Ripeness at harvest
  • Processing methods (canning, fermenting, etc.)
  • Storage conditions and duration

This data should be used as reference values only, as actual measurements may vary considerably.

References