Microalgae biomass and their products are invaluable bio-resources with numerous applications in food, feed, pharmacy, cosmetics, and environments. The effects of light intensities on biomass, chlorophyll-a, and total carotenoid production by Chlorella sorokiniana and Ankistrodesmus falcatus were studied in Bold's Basal Medium (BBM) and Poultry Medium (PM) as the growth media. The growth of C. sorokiniana and A. falcatus increased with increase in light intensity in PM and was inhibited at 1786 lux in C. sorokiniana in BBM. PM supported higher biomass production by C. sorokiniana than BBM while it was the reverse for A. falcatus. A. falcatus produced higher (P ≤ 0.05) concentrations of chlorophyll-a than C. sorokiniana in both media. The highest carotenoid concentration of 11.84 mg/g-biomass was accumulated by C. sorokiniana in PM as against 7.027 mg/g-biomass obtained in BBM. On the other hand, the highest carotenoid concentration of 7.633 mg/g-biomass was accumulated by A. falcatus in BBM as against 4.299 mg/g-biomass obtained in PM. It is interesting to note in the present study that a cheap medium such as PM supported higher biomass and carotenoid production by C. sorokiniana than BBM.
Chlorella sorokiniana Shih. et Krauss, a unicellular green alga was assayed to assess its to promotion potentials response of aqueous and ethanolic leaf extracts of Moringa oleifera Lam. C. sorokiniana grown in 200 ml aliquots of modified basal medium for two weeks: was treated with the aqueous and ethanolic extracts at 10, 20, 30, 40 and 50% concentrations, respectively. A control was set up without Moringa extract and each treatment replicated thrice. The increases in biomass (individuals/mL) were monitored at twoday intervals. Both aqueous and ethanolic leaf extracts had appreciable promoter effects (61.49 and 95.55%, increases respectively) over the control. The ethanolic exhibited more growth activity (21.09%) than the aqueous extract. The promoter effects of both extracts increased proportionally with the increase in levels of concentration with time. There were significant differences in the interactive effects of the extracts, concentration and day (duration) (p<0.05). The findings of this study indicate the potential use of the aqueous and ethanolic leaf extracts of M. oleifera as possible enrichments for C. sorokiniana growth medium.
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