The main purpose of this study is to provide information on the biochemical composition of the total lipid extract of three different native freshwater microalgae namely Acutodesmus obliquus CN01, Chlorella sp. Carolina-15-2069, and Chlorella vulgaris NIES-1269 at different growth phases, cultured under standardized conditions that will be useful for commercialization purposes due to the content of α-linolenic acid (ALA), a type of omega-3 fatty acids. We monitored growth, biomass accumulation, chlorophyll content, lipid content and fatty acids composition in all three freshwater microalgae. In addition, this study seeks to throw some light on the lipid content of a newly isolated freshwater green alga Acutodesmus obliquus CN01 which have shown to give significant quantities of ALA, an added nutritional value to this microalga oil. Acutodesmus obliquus CN01 exhibited the fastest growth rate among the three microalgae used. Biomass was shown to be enhanced in the nitrogen enrichment medium. The outcomes from this study indicated that newly isolated Acutodesmus obliquus CN01 from Malaysia cultured under normal condition showed fast growth rate with high lipid content and also high ALA content. Therefore, from this study, Acutodesmus obliquus CN01 was identified as species of choice to be further explored for its potential to produce omega-3 fatty acids.
The search for new antibiotics is on the rise because of the growing threat of antibiotic resistance. Once the antibiotics fail to work, people are at risk of dying of common infections, and routine operations become difficult to perform, making millions of lives at risk. In our study, the authors found that a photosynthetic bacterium can provide a good potential source of another group of antimicrobial compounds known as photoantimicrobial compounds. This psychrotrophic bacterium was isolated from the Antarctic and grew well at a temperature ranging from 10 °C to 30 °C in the acetate medium, implying minimum energy usage by the bacteria contributing to energy saving for its bioprocessing. The bacteria identified as Stenotrophomonas sp. via 16S rDNA analysis and coded as SZB2 strain was rod shaped. Gram negative and possessed bacteriochlorophyll a and b are usually found in photosynthetic bacteria. SZB2 was found to produce antibacterial substances from the cocultivation assay with both Gram negative and Gram positive bacteria such as Escherichia coli and Staphylococcus aureus. The growth inhibition was higher in S. aureus than that of E. coli. Hence, it may be concluded the bacteria had the ability to produce a wide spectrum antibiotic.
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