Research Article
Subcritical Water Extraction of Chlorella pyrenoidosa: Optimization through Response Surface Methodology
Table 2
Proximate, ultimate, and biochemical analysis of freshwater algae species.
| Properties | Chlorella pyrenoidosa | Oedogonium sp. | Cladophora vagabunda |
| Proximate (wt.%) | Moisture | 5.60 | 6.5 | 5.7 | Ash | 7.50 | 20.6 | 17.8 |
| Biochemical (wt.%) | Organic content | 86.90 | 72.9 | 76.5 | Carbohydrate | 22.80 | 41.0 | 44.4 | Protein | 62.70 | 22.5 | 26.8 | Lipid | 1.40 | 9.4 | 5.3 |
| Ultimate (wt.%) | Carbon | 44.53 | 36.6 | 37.5 | Hydrogen | 5.71 | 5.7 | 5.9 | Oxygen | 38.87 | 30.9 | 32.9 | Nitrogen | 9.80 | 4.8 | 6.5 | Sulfur | 1.09 | 0.4 | 1.8 | HHV (MJ/kg) | 18.06 | 15.8 | 16.4 | Reference | This study | [15] | [15] |
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O (wt.%) = 100 – (C + H + N) (wt.%); HHV: higher heating value. |