What this work is about, in plain words
The authors described a strain of the bottom-dwelling diatom Cylindrotheca fusiformis that grows fast and accumulates the pigment fucoxanthin and polyunsaturated fatty acids. The cells settle to the bottom on their own, so the biomass is easier to harvest.
Diatoms interest biotechnologists for two groups of substances: the orange-brown pigment fucoxanthin and polyunsaturated fatty acids. To obtain them in noticeable amounts, one needs a species that both grows fast and accumulates a lot of them. The authors tested a strain of the bottom-dwelling diatom Cylindrotheca fusiformis from their own research for this role.
The culture was grown in intensive mode, and growth and biomass composition were monitored. Fucoxanthin was isolated, and its structure was confirmed by several independent analytical methods (absorption spectra, mass spectrometry, nuclear magnetic resonance).
According to the authors, the maximum productivity of the culture was 1.56 g per liter per day, and the biomass contained up to 21.4 mg of fucoxanthin per gram of dry weight. Polyunsaturated acids, including eicosapentaenoic and arachidonic acids, made up a noticeable share of the fatty acids. Without mixing, the cells settle to the bottom, which makes it easier to separate the biomass from the medium.
The work shows that such a strain can be a raw material for two valuable products at once.
Limitations. The results were obtained on one strain in a laboratory culture. The explanation was written from a preprint of the article, not from the final journal version. The strain belongs to the authors of the study, and the results do not describe Laboratory 17 batches.