2. True protein content change before and after fermentation After the nitrogen content was measured with a Kjeldahl analyzer and calculation, the true protein contents were obtained for the non-fermented and fermented pork jerky samples of 81.09 ± 0.54 g/100 g and 64.11 ± 0.49 g/100 g, respectively (Table 1). From comparison, it could be seen that the fermented jerky has significantly less protein than the non-fermented jerky. This indicated that during the fermentation process, the Lactobacillus hydrolyzed a portion of the pork protein and produced higher proportions of polypeptides and abundant amino acids. Consequently, the fermented products became easier to digest and absorb, and offered better biochemical availability (Chen & Liu, 2004).