Thermal and chromatographic characterization of biomass, lipid material, and microalgal biodiesel from Monoraphidium sp.

Gomes, Anderson Fernandes; Gomes, Marcos Paulo Salgado; Souza, Luíz Di; Costa, Marta

doi:10.1007/s10973-014-4347-5

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…The reduction in the thermal stability of the esterified samples, when compared to the respective crude extracts, is an evidence corroborating the formation of MME [50,63,64]. The saponifiable fraction includes mainly fatty acids, TAGs and phospholipids which are more thermally stable.…”

Section: Thermal Analysis (Tg/dtg)supporting

confidence: 52%

“…The biomass characterization by TG can make it possible to estimate the average content (%) of TAG and other saponifiable lipid fractions (including fatty acids and phospholipids) by evaluating the results before and after the extraction process, providing a practical and fast way to size the extraction efficiency. The literature reports that the thermal events related to the lipid fraction (exclusively TAG) are between 350 and 450 °C, events ratified as decomposition or volatilization of triacylglycerides [49,50].…”

Section: Extraction Of Lipid Fractions Characterization Of Residual B...mentioning

confidence: 99%

“…It is possible to infer that the observed behavior is due to RBHF4h being more concentrated of less volatile components, as there is a notable reduction in mass loss in the TE3 of RBHF4h, a characteristic region of the saponifiable lipid fraction. It is important to note that several authors have been using the technique for quantitative purposes and obtaining relevant results [50]. The remaining residues of the pyrolysis of each biomass (Fig.…”

Section: Extraction Of Lipid Fractions Characterization Of Residual B...mentioning

confidence: 99%

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Extraction and characterization of the saponifiable lipid fraction from microalgae Chlamydomonas sp. cultivated under stress

Gomes

Bicudo

Costa

et al. 2019

J Therm Anal Calorim

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Microalgae when subjected to nutrient restriction conditions, inducing environmental stress, are prone to total lipid accumulation and changes in the fatty profile. In this context, the green microalgae Chlamydomonas sp. was submitted for 3 days to the absence of nutrients. Thus, the efficacy of the extraction of the crude hexane lipid fraction (CHF), using mechanical stirred associated with ultrasound technique, was evaluated in two different times (2 and 4 h), using scanning electron microscopy and thermogravimetric analysis (TG). Saponifiable fractions, CHF extracts and crude chloroform fraction (CCF) were esterified and characterized by TG, FTIR and GC/MS to identify their fatty profile. Residual biomass (RB) was analyzed by elemental analysis, and the resulting data were employed to estimate the higher heating value (HHV) and crude protein percentage. The micrographs of the biomass surfaces before and after the extraction process showed significant fragmentation only for the time of 4 h. A pronounced mass loss in the typical lipid range was evidenced by TG being consistent with the significant difference of material extracted in the time of 2 h (2.95 ± 0.28)% and 4 h (10.54 ± 0.46)%. The total lipid fraction (CHF and CCF) was approximately 29%. The RB revealed values of HHV and crude protein of 18 MJ kg -1 and 56%, respectively. The TG data for the CCF extract revealed a material consisting mainly of saponifiable fractions, unlike CHF which is composed predominantly of unsaponifiables. Therefore, the TG curve ratified a better conversion rate to CCF (approximately 89%), consistent with the value obtained by GC/MS (about 86%). The fatty profile for the saponifiable fractions of both extracts showed that the major fatty acids are C16:0 and C18:3 (x-3 and x-6). The ester profile with elevated concentration of polyunsaturated fatty acids (C18:3) is unfeasible in their application for biodiesel production; nevertheless, the fatty profile of microalgae suggests pharmacological potential for diet or therapy, since some of the main components are reported as bioactive metabolites.

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Section: Thermal Analysis (Tg/dtg)supporting

confidence: 52%

Section: Extraction Of Lipid Fractions Characterization Of Residual B...mentioning

confidence: 99%

Section: Extraction Of Lipid Fractions Characterization Of Residual B...mentioning

confidence: 99%

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Extraction and characterization of the saponifiable lipid fraction from microalgae Chlamydomonas sp. cultivated under stress

Gomes

Bicudo

Costa

et al. 2019

J Therm Anal Calorim

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“…The total contents of lipids in the LTPNA 01 strain (2.60%) and the bloom material (3.22%) were close to the value reported by Almeida et al [38] for C. vulgaris (3.22%) but higher than those found in A. platensis (0.8-1.15%) [38,40] and the microalgae Monoraphidium sp. [41]. However, Kebelmann et al [39] found higher values of lipid content in C. reinhardtii wild type (18.1%), C. reinhardtii CW15 + (22.4%), and C. vulgaris (15.5%).…”

Section: Discussionmentioning

confidence: 95%

Chemical Characterization of Microcystis aeruginosa for Feed and Energy Uses

et al. 2021

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Cyanobacterial blooms and strains absorb carbon dioxide, drawing attention to its use as feed for animals and renewable energy sources. However, cyanobacteria can produce toxins and have a low heating value. Herein, we studied a cyanobacterial strain harvested during a bloom event and analyzed it to use as animal feed and a source of energy supply. The thermal properties and the contents of total nitrogen, protein, carbohydrate, fatty acids, lipid, and the presence of cyanotoxins were investigated in the Microcystis aeruginosa LTPNA 01 strain and in a bloom material. Microcystins (hepatotoxins) were not detected in this strain nor in the bloom material by liquid chromatography coupled to mass spectrometry. Thermogravimetric analysis showed that degradation reactions (devolatilization) initiated at around 180 °C, dropping from approximately 90% to 20% of the samples’ mass. Our work showed that despite presenting a low heating value, both biomass and non-toxic M. aeruginosa LTPNA 01 could be used as energy sources either by burning or producing biofuels. Both can be considered a protein and carbohydrate source similar to some microalgae species as well as biomass fuel. It could also be used as additive for animal feed; however, its safety and potential adverse health effects should be further investigated.

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Influence of the purification process on the stability of Jatropha curcas biodiesel

Cordeiro

Gondim

Araújo

et al. 2016

J Therm Anal Calorim

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Thermal and chromatographic characterization of biomass, lipid material, and microalgal biodiesel from Monoraphidium sp.

Cited by 5 publications

References 3 publications

Extraction and characterization of the saponifiable lipid fraction from microalgae Chlamydomonas sp. cultivated under stress

Extraction and characterization of the saponifiable lipid fraction from microalgae Chlamydomonas sp. cultivated under stress

Chemical Characterization of Microcystis aeruginosa for Feed and Energy Uses

Influence of the purification process on the stability of Jatropha curcas biodiesel

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