5.1. The determination of pH A solid sample of 1 g was ground finely in a mortar and then soaked in 10 mL ddH2O for 30 min. The filtered solution was used for measurement with a pH meter. The liquid sample was directly used for pH measurement. The solid samples included nonfermented and fermented pork jerky; and the liquid samples included the remaining fermented medium, and the medium before fermentation.