Table 2.
Molecular weight and relative abundance (percentual expression) of EPS fractions produced by L paracasei strains in milk at different temperatures.
| L. paracasei strain | Temperature | EPS molecular weight (Da) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| High MW fraction (>1 × 105) | Middle MW fraction (3 × 104 < PM > 1 × 105) | Low MW fraction (<3 × 104) | |||||||
| Mw | Relative abundance % | Mw | Relative abundance % | Mw | Relative abundance % | Mw | Relative abundance % | ||
| CIDCA 8339 | 20°C | - | - | 1.4 × 105 | 57.1 | - | - | 9.0 × 103 | 42.9 |
| 30°C | - | - | 3.9 × 105 | 50.0 | - | - | 1.0 × 104 | 50.0 | |
| 37°C | - | - | 5.4 × 105 | 33.3 | - | - | 1.2 × 104 | 66.7 | |
| CIDCA 83123 | 20°C | 3.4 × 106 | 85.1 | 6.0 × 105 | 6.4 | 7.4 × 104 | 2,1 | 1.0 × 104 | 6.8 |
| 30°C | 3.3 × 106 | 17.6 | 6.8 × 105 | 17.6 | 7.1 × 104 | 5.9 | 1.1 × 104 | 58.9 | |
| 37°C | 3.5 × 106 | 9.5 | 4.5 × 105 | 14.3 | 7.8 × 104 | 9.5 | 1.2 × 104 | 66.7 | |
| CIDCA 83124 | 20°C | 3.7 × 106 | 80.0 | - | - | - | - | 1.1 × 104 | 20.0 |
| 30°C | 5.7 × 106 | 21.0 | 6.9 × 105 | 10.5 | 7.0 × 104 | 5.3 | 1.1 × 104 | 63.1 | |
| 37°C | 1.1 × 106 | 14.3 | - | - | - | - | 1.5 × 104 | 85.7 | |
Relative abundance is calculated considering the percentage of the area of each peak referred to the total area of the chromatogram. Standard deviation ranged between 0.05 and 0.2. Standard deviation in retention time of peak ranged from 0.04 to 0.06.