Table 5.
Content of individual phenolic/secoiridoid compounds in non-sterile lye (non-enriched or nutrient-enriched) prior and after fermentation at the maximum β-carotene production by B. trispora (fermentation time: 6 days).
| Compound 1 | Concentration (mg/L) 2 | λmax (nm) 3 | FL 4 | ||
|---|---|---|---|---|---|
| 0 d | 6 d (Non-Enriched) | 6 d (Enriched) | |||
| HTyr | 135.9 a ± 5.5 | 58.0 b ± 8.0 | 131.3 a ± 10.9 | 239, 279 | yes |
| OMeHTyr | 110.5 a ± 3.9 | 69.7 b ± 5.8 | 100.1 a ± 7.5 | 239, 267, 389 | no |
| Tyr | 75.5 a ± 2.8 | 72.6 a ± 8.0 | 73.1 a ± 6.5 | 239, 275 | yes |
| CA | 5.3 a ± 0.3 | 5.1 a ± 0.4 | 5.2 a ± 0.3 | 241, 289, 322 | no |
| LuG | 15.3 a ± 0.6 | 14.9 a ± 1.3 | 15.1 a ± 1.0 | 245, 348 | no |
| CuA | 19.2 a ± 0.8 | not detected | 19.5 a ± 1.6 | 242, 307 | no |
1 HTyr = hydroxytyrosol, OMeHTyr = methoxy derivative of hydroxytyrosol, Tyr = tyrosol, CA = caffeic acid, LuG = luteolin-7-O-glucoside, and CuA = p-coumaric acid. 2 Each value was expressed as mean ± standard deviation of three replicates. Different lowercase letters (a and b) in the same row represent significant differences in values (p< 0.05). 3 λmax = maximum absorbance (UV spectra). 4 FL = fluorescence.