What this work is about, in plain words
The authors studied the little-researched diatom Nitzschia amabilis: at what salinity and light it grows best and how many valuable substances it accumulates.
Diatoms are a source of fucoxanthin and polyunsaturated fatty acids, but only a small part of their diversity has been studied. The authors took a little-researched species, Nitzschia amabilis, and set out to determine the conditions for its optimal growth, as well as its biochemical composition and productivity.
The culture was grown in the laboratory at different salinity, irradiance and day length, and then in batches and in continuous-flow mode, where the medium is constantly renewed.
According to the authors, the alga grows best at a salinity of 35–36 ‰, an irradiance of about 3 klx and a 14-hour light day. It can grow over a very wide salinity range, from 4 to 68 ‰. It uses light economically: saturation is reached already at moderate irradiance. Polyunsaturated acids, including eicosapentaenoic, arachidonic and docosahexaenoic acids, predominated among the fatty acids. In continuous-flow mode, productivity in terms of lipids, fucoxanthin and polyunsaturated fatty acids was 2.5–3 times higher than in batch growth.
The work adds another species to the list of diatoms promising for biotechnology.
Limitations. The experiments were carried out on one strain under laboratory conditions. The results were obtained by the authors of the article and do not describe Laboratory 17 batches.