FAMEs production from Scenedesmus obliquus in autotrophic, heterotrophic and mixotrophic cultures under different nitrogen conditions

Abstract

This study investigated the growth and biodiesel production of S. obliquus from autotrophic, heterotrophic and mixotrophic cultures under different nitrogen conditions.

Microalgae as Sustainable Bio-Factories of Healthy Lipids: Evaluating Fatty Acid Content and Antioxidant Activity

“…These results are in line with what was previously reported for S. obliquus ; however, some studies have reported high abundances of EPA in this microorganism, which we do not report [ 69 , 70 , 71 , 72 ]. Nonetheless, variations in cultivation might justify the absence of EPA, as salinity, nitrogen, and nutrient stress affect the composition and yield of FA [ 73 , 74 , 75 , 76 ]. Additionally, the way S. obliquus biomass is processed has been shown to affect the abundance of FA [ 69 ].…”

A multidisciplinary review ofTetradesmus obliquus: a microalga suitable for large‐scale biomass production and emerging environmental applications

“…They are essential because your body cannot produce them on its own so they must come from the diet. FAs composition and yield of T. obliquus varies depending on salinity (Salama et al 2013), nitrogen source (An et al 2020), nutrient stress (Chu et al 2014), cultivation mode (Shen et al 2018) or the way in which biomass is processed (explained in Microalgae harvesting and biomass processing section). The main FAs reported for T. obliquus biomass are listed in Table 3.…”

Evaluation of the effect of agitation speed on the growth and high‐value LC‐PUFA formation of Porphyridium cruentum based on basic rheological analysis

“…In terms of these results, we hypothesize that the LC-PUFAs (ARA or EPA) formulation for five agitation speeds were all deduced via Route 2. In this, LA (C18:2▵9,12) first converts to GLA ( -linolenic acid, C18:3▵6,9,12) by ▵6-desaturation and afterwards to ARA (C20:4▵5, 8,11,14) by C2 elongation and ▵5-desaturation, finally generating EPA (C20:5▵5,8,11,14,17) by 3-desaturation. Moreover the presumption was that the middle agitation speeds (150-300 rpm) reduced the activity of 3-desaturation and thus inhibited the conversion from ARA to EPA, inevitably leading to an increase content of ARA and LA and a decrease in the content of EPA.…”

“…On the basis of the results of the basic rheological characterization of P. cruentum suspensions, the relationship between ; GLA: -linolenic acid (C18:3▵6, 9,12); ALA, -linolenic acid (C18:3▵9,12,15); SDA, stearidonic acid (C18:4▵6, 9,12,15); DGLA, di-homo -linolenic acid (C20:3▵8, 11,14); ARA, arachidonic acid (C20:4▵5, 8,11,14); ETA, eicosatetraenoic acid (C20:4▵8, 11,14,17); EPA, eicosapentaenoic acid (C20:5▵5, 8,11,14,17). ▵6 Des, ▵6-desaturation; C2 Elo, C2-elongation; ▵5 Des, ▵5-desaturation.…”

“…Studies on the cultivation of microalgae so far have focussed mainly on the effects of growth conditions, such as light intensity, temperature, nutrient level, cultivation mode and cultivation-reactor type. [11][12][13][14] Amongst these growth conditions, the rheological properties of microalgal suspensions can affect both transport (transfer effect of nutrients within the suspensions) and downstream processes (harvesting and dewatering). 15 For example, Adesanya et al 16 examined the rheology of microalgal suspensions for biofuel processing and indicated that a scientific understanding of the fluid behavior of microalgal suspensions could promote effective microalgae growth and processing.…”