Table 2. Comparison of the H2 production from the present contribution with the corresponding ones from the literature.
| References | Alga | Method of H2 estimation | Duration | Maximal H2 production | Estimated H2 production from the present contribution in the given literature parameters | Fold excess of H2 production*e) |
| Present contribution | Scenedesmus obliquus | Gas chromatography | 5 d | *a) 4.7 mL Η2 (mL PCV)−1 *b) 12.3 mL Η2 (mL PCV)−1 | – | – |
| Ref. [58] | Chlamydomonas reinhardii | Mass spectrometer | 5 d | *c) 0.7 µmol H2 (µg chls)−1 | 1.49 µmol H2 (µg chls)−1 | 2–5.5 x |
| Ref. [16] | Chlamydomonas reinhardii | Mass spectrometer | 2 d | 12.2 nmol (µg chls h)−1 | *d) 25.2 nmol (µg chls h)−1 | 2–5,4 x |
| Ref. [66] | Chlamydomonas reinhardii mutant sta6 | Mass spectrometer | 5 d | *c) 420 µmol (10−9 cells) | 389 µmol (10−9 cells) | 1–3 x |
| Ref. [59] | Chlamydomonas reinhardii mutant Stm6 | Gas chromatography | 5 d | *c) 7.7 mL Η2 (mg chls)−1 | 33.4 mL Η2 (mg chls)−1 | 4.3–11.3 x |
| Ref. [23] | Chlamydomonas reinhardii | Gas chromatography | 2 d | 5.94 µmol (mg chl h)−1 | *d) 25.2 µmol (mg chls h)−1 | 4.2–11 x |
| Ref. [69] | Scenedesmus obliquus | Amperometrically | 16 h | 2.5 µmol H2 (mL PCV)−1 | *d) 210 µmol (mL PCV)−1 | 84–220 x |
| Ref. [67] | Chlamydomonas reinhardii | Gas chromatography | 5 d | *c) 35 µmol (mL gas phase)−1 | 130 µmol (mL gas phase)−1 | 3.7–9.7 x |
| Ref. [60] | Chlamydomonas reinhardii | Mass spectrometer | 3 d | 0.27 mmol H2 (mg chls)−1 | 1.23 mmol H2 (mg chls)−1 | 4.5–11.8 x |
| Ref. [61] | Scenedesmus obliquus | Warburg apparatus | 5 h | 212.2 µmol (mg chls)−1 | *d) 582 µmol (mg chls)−1 | 2.7–7.1 x |
| Ref. [62] | Chlamydomonas reinhardii | Bio-gas Detector | 1 d | 24.4 nmol H2 (µg chl)−1 | *d) 582 nmol (µg chls)−1 | 23.8–62.2 x |
| Ref. [63] | Chlamydomonas reinhardii mutant L159I-N230Y | Gas chromatography | 285 h | 166 mL H2 (g chl h)−1 | *d) 565 mL H2 (g chl h)−1 | 3.4–8.9 x |
| Ref. [64] | Chlamydomonas reinhardii | Manometrically | 4 h | 7 µmol H2 (mg chl h)−1 | *d) 25.2 µmol (mg chls h)−1 | 3.6–9.4 x |
This comparison is not absolutely correct, because the conditions and the parameters used in the literature are totally different.
*a)
: The maximal H2 production from Figure 5C.
*b)
: The maximal H2 production from Fig. 8B.
*c)
: The hydrogen production used for the comparison referred to the 5th incubation day.
*d)
: The rate was calculated from the 1st to the 2nd incubation day.
*e)
: The first number represents the comparison of the H2 production from the present contribution (Figure 5C) [4.7 mL H2 (mL PCV) −1] with the corresponding ones of other publications. The second number represents the comparison of our maximal H2 production (Figure 8B) [12.3 mL H2 (mL PCV) −1] with the corresponding ones of other publications.