Marine microalgae as a potential source of single cell protein (SCP)

Abstract

The marine microalgae Tetraselmis suecica, Isochrysis galbana, Dunaliella tertiolecta and Chlorella stigmatophora are good biological sources of single cell protein (SCP). Protein content accounts for 39.12%-54.20% of the dry matter, D.tertiolecta having the highest. Lysine values are between 3.67 and 4.52 g/100 g of protein, and thus are higher than those for freshwater species. The total nucleic acid content is less than 7% of the dry matter; this value is definitely lower than that for yeasts or bacteria, commonly used as SCP sources. Amino acid profiles of the four species are very similar and comparable to the FAO reference protein, buth with a low content of methionine and cystine and a high content of lysine. The MEAA indices are between 81 and 84.98, without significant differences among the four species. Marine microalgae can be used as a potential SCP source.

Recovery of c-phycocyanin from the cyanobacteriumSpirulina maxima

“…These include: production of pigments such as phycocyanin, E-carotene, astaxanthin, chlorophyll-a and others (Tel-Or et al, 1980;Francis, 1987); polyunsaturated fatty acids such as y-linolenic acid, GLA (Grattan Roughan, 1989); enzymes such as ferredoxin (Tel-Or et al, 1980). It has also been suggested as a source of single cell protein (Fabregas & Herrero, 1985) or as aquaculture feed; however, because of the relatively high production costs, these latter applications seem improbable in the foreseeable future.…”

MOLECULAR CHARACTERIZATION OF THE ASSIMILATORY NITRATE REDUCTASE GENE AND ITS EXPRESSION IN THE MARINE GREEN ALGA DUNALIELLA TERTIOLECTA (CHLOROPHYCEAE)1

“…The CO 2 concentrating mechanism can enhance CO 2 supply to the RUBISCO pathway and increase the efficiency of nutrient utilization (Beardall and Giordano 2002). For industrial and aquacultural applications, D. tertiolecta is used to produce glycerol and the carotenoid β‐carotene (Ben‐Amotz and Avron 1980) and also used as a source of single‐cell protein and of minerals in fish diets and aquacultural feeding of marine fishes and bivalve mollusks (Fabregas and Herrero 1985, 1986). In addition, D. tertiolecta can be used in bioremediation for removing heavy metals from the environment because it synthesizes heavy metal binding peptides, phytochelatins, which play an important role in detoxification and accumulation of heavy metals (Hirata et al 2001, Tsuji et al 2002).…”

Biophotonic Combined Energy System (BCES)

“…In the context of raw materials there is distinguished between carbohydrates, lignins, lipids, proteins and special substances like dyes. The results of a brief literature study clearly showed that any kind of these raw materials can be extracted from micro algae, anyway [2,3,4,5,6,7]. and of total biomass 0.5 g · l -1 · d -1 , referred to the physiological state and the cultivation conditions.…”