Table 2 Protease activities of LAB strains cultured under suitable conditions
| LAB strains | Inoculation (%) | T (℃) | pH | Time (h) | Carbon source | Protease activity (U/mL) |
| Lactobacillus helveticus | 3 | 37 | 7.0 | 40 | Glucose | 12.52±2.17 |
| Lactobacillus paracasei | 1 | 40 | 6.5 | 6 | Lactose | 11.36±2.04 |
| Lactobacillus sakei | 3 | 37 | 6.5 | 42 | Sucrose | 9.61±1.35 |
| Lactobacillus curvatus | 2 | 37 | 7.0 | 30 | Glucose | 8.87±1.61 |
| Pediococcus acidilactici | 3 | 40 | 7.0 | 30 | Glucose | 4.93±0.99 |
LAB, lactic acid bacteria.
Values of protease activity of 5 LAB strains were determined at the end of fermenting under the corresponding set of suitable conditons obtained through single-factor tests as listed in this table.