Evaluation of tropical seaweeds as feedstock for bioethanol production

Hessami, Mohammad Javad; Phang, Siew‐Moi; Salleh, Aishah; Rabiei, Reza

doi:10.1007/s13762-017-1455-3

Cited by 27 publications

(10 citation statements)

References 74 publications

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“…It might be attributed to application of H 2 SO 4 at a higher concentration for biomass hydrolysis in the present study, which showed higher efficiency than HCl. 51 In addition, the present study showed 34.2% higher carbohydrate content in D. fasciola than the maximum recorded carbohydrate content of U. intestinalis in the aforementioned study. Moreover, not only carbohydrate content is essential for bioethanol production, but also sugar composition plays a significant role in the fermentation efficiency.…”

Section: Fermentation and Ethanol Yieldsupporting

confidence: 55%

Sequential biofuel production from seaweeds enhances the energy recovery: A case study for biodiesel and bioethanol production

Elshobary

El-Shenody

Abomohra

2020

Intl J of Energy Research

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In the present study, eight seaweeds (five red, two brown and one green) were collected and evaluated for dual biodiesel and/or bioethanol production. The highest significant lipid and carbohydrate contents were recorded in the brown seaweed Dilophus fasciola (4.92 and 37.97%dw, respectively). Three routes were investigated, namely R1 and R2 for direct production of biodiesel and bioethanol, respectively, from the whole biomass, in addition to R3 representing the sequential biodiesel and bioethanol production. D. fasciola showed a biodiesel yield of 35.04 mg g −1 dw, composed mainly of C16-C18 fatty acids with a high saturation degree. All biodiesel characteristics complied with the recommended values of international standards. The maximum reducing sugar content (37.2 g L −1) and bioethanol productivity at 72 hours (0.165 g L −1 h −1) were recorded in the lipid-free biomass (R3), which were 16.3% and 27.9%, respectively, higher than that of R2. Therefore, a maximum estimated total energy output of 9.96 MJ kg −1 was recorded in R3, which represented 6-times and 28.3% higher than R1 and R2, respectively.

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Section: Fermentation and Ethanol Yieldsupporting

confidence: 55%

Sequential biofuel production from seaweeds enhances the energy recovery: A case study for biodiesel and bioethanol production

Elshobary

El-Shenody

Abomohra

2020

Intl J of Energy Research

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“…MITM10 was performed and the biochemical constituents (viz., carbohydrate, protein, lipid, and ash content) were estimated on dry weight (dw) basis as shown in Table 1 . Among them, the amount of carbohydrate, protein, and lipid contents are comparable with the reported literature for the green macroalgal strains, e.g., U. flexuosa (Hessami et al 2018 ) and U. fasciata (Singh et al 2015 ). However, the higher ash content may be due to presence of excessive minerals, like Mn and Zn (13.92 to 304.55 μg/g dry mass of the Donax faba ) during post-monsoon season and contaminants (e.g., ammonia and sulfur) from the effluent of the industrial port or nearby shipyard company, which inflows to seawater (Tenjing et al 2017 ).…”

Section: Resultssupporting

confidence: 86%

“…Alongside, the variability of the total sugar to monomeric sugar content has also been described for the various strains of macroalgae (Jang et al 2012 ); however, in our sampling, the conversion ratio within two seasons for the same strain was found to be less (32.1–63%) as compared to the other macroalgal species (Jang et al 2012 ). Furthermore, the presence of fermentation inhibitors (furfural and 5-hydroxy-methyl furfural) in the treated hydrolysate (resultant of 1M acid treatment) of the optimal macroalgal biomass (MITM10) was also analyzed using chloroform extraction based UV-spectrophotometry and determined to be within the reported range (0.02–0.03 g/L) for the Ulva species (Melo et al 2016 ; Hessami et al 2018 ). Hence, the fermentable monomeric reducing sugar content comprises a major proportion of the total sugar pool of the collected biomass, as profiled in Fig.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of seasonal variation and the optimization of reducing sugar extraction from Ulva prolifera biomass using thermochemical method

Dave

Varadavenkatesan

Singh

et al. 2021

Environ Sci Pollut Res

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Green macroalgae comprise significant amount of structural carbohydrates for their conversion to liquid biofuels. However, it generally relies on species characteristics and the variability in seasonal profile to determine its route for bioprocessing. Hence, this study was conducted to analyze the indigenous marine macroalgal strain (Ulva prolifera) with respect to periodic trend and reducing sugar extraction. Consequently, in our investigation, the monthly variation in sugar profile and bioethanol yield was assessed between the monsoon and post-monsoon seasons, of which relatively high reducing sugar and fermentative bioethanol yield of about 0.152 ± 0.009 g/gdw and 6.275 ± 0.161 g/L was obtained for the October-month isolate (MITM10). Thereafter, the biochemical profile of this collected biomass (MITM10) revealed carbohydrate 34.98 ± 3.30%, protein 12.45 ± 0.49%, and lipid 1.93 ± 0.07%, respectively, on dry weight basis. Of these, the total carbohydrate fraction yielded the maximum reducing sugar of 0.156 ± 0.005 g/gdw under optimal conditions (11.07% (w/v) dosage, 0.9 M H2SO4, 121°C for 50 min) for thermal-acid hydrolysis. Furthermore, the elimination of polysaccharides was confirmed using the characterization techniques scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Therefore, the present thermochemical treatment method provides a species-specific novel strategy to breakdown the macroalgal cell wall polysaccharides that enhances sugar extraction for its utilization as an efficient bioenergy resource.

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“…Two days before the fermentation study, it was cultured in YPD broth media (20 g/L glucose, 20 g/L peptone, 10 g/L yeast extract), and kept on a rotary shaker with 150 rpm at 30 °C. To reduce the influence of yeast seed media, the desired volume (5% v/v) was washed with normal saline and concentrated by centrifugation (2500g, Hettich EBA 20, Germany) followed by addition of the prepared media to obtain 1.5 × 10 7 CFU/mL (Hessami et al 2018a).…”

Section: Yeast Pre-culture and Adaptationmentioning

confidence: 99%

Bioethanol production from agarophyte red seaweed, Gelidium elegans, using a novel sample preparation method for analysing bioethanol content by gas chromatography

et al. 2019

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In this study, Gelidium elegans is investigated for ethanol production. A combination of factors including different temperatures, acid concentration and incubation time was evaluated to determine the suitable saccharification conditions. The combination of 2.5% (w/v) H 2 SO 4 at 120 °C for 40 min was selected for hydrolysis of the seaweed biomass, followed by purification, and fermentation to yield ethanol. The galactose and glucose were dominant reducing sugars in the G. elegans hydrolysate and under optimum condition of dilute acid hydrolysis, 39.42% of reducing sugars was produced and fermentation resulted in ethanol concentration of 13.27 ± 0.47 g/L. A modified method was evaluated for sample preparation for gas chromatography (GC) analysis of the ethanol content. A solvent mixture of acetonitrile and iso-butanol precipitated dissolved organic residues and reduced water content in GC samples at least by 90%. Results showed that this method could be successfully used for bioethanol production from seaweed.

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Evaluation of tropical seaweeds as feedstock for bioethanol production

Cited by 27 publications

References 74 publications

Sequential biofuel production from seaweeds enhances the energy recovery: A case study for biodiesel and bioethanol production

Sequential biofuel production from seaweeds enhances the energy recovery: A case study for biodiesel and bioethanol production

Evaluation of seasonal variation and the optimization of reducing sugar extraction from Ulva prolifera biomass using thermochemical method

Bioethanol production from agarophyte red seaweed, Gelidium elegans, using a novel sample preparation method for analysing bioethanol content by gas chromatography

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