Hydrogen and volatile fatty acids production from marine macroalgae by anaerobic fermentation

Kidanu, Weldejewergis Gebrewahid; Trang, Pham Thu; Yoon, Hyon Hee

doi:10.1007/s12257-017-0258-1

Cited by 26 publications

(7 citation statements)

References 35 publications

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“…Microbial conversion is a highly promising process for the production of diverse value-added chemicals and as an alternative to petroleum-based processes [1,2]. Specifically, it can utilize a variety of sugars such as glucose, galactose, xylose and glycerol, which are plentiful in nature and readily available as industrial waste, as a feedstock [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Efficient Conversion of Acetate to 3-Hydroxypropionic Acid by Engineered Escherichia coli

et al. 2018

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Acetate, which is an abundant carbon source, is a potential feedstock for microbial processes that produce diverse value-added chemicals. In this study, we produced 3-hydroxypropionic acid (3-HP) from acetate with engineered Escherichia coli. For the efficient conversion of acetate to 3-HP, we initially introduced heterologous mcr (encoding malonyl-CoA reductase) from Chloroflexus aurantiacus. Then, the acetate assimilating pathway and glyoxylate shunt pathway were activated by overexpressing acs (encoding acetyl-CoA synthetase) and deleting iclR (encoding the glyoxylate shunt pathway repressor). Because a key precursor malonyl-CoA is also consumed for fatty acid synthesis, we decreased carbon flux to fatty acid synthesis by adding cerulenin. Subsequently, we found that inhibiting fatty acid synthesis dramatically improved 3-HP production (3.00 g/L of 3-HP from 8.98 g/L of acetate). The results indicated that acetate can be used as a promising carbon source for microbial processes and that 3-HP can be produced from acetate with a high yield (44.6% of the theoretical maximum yield).

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Section: Introductionmentioning

confidence: 99%

Efficient Conversion of Acetate to 3-Hydroxypropionic Acid by Engineered Escherichia coli

et al. 2018

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“…Volatile organic compounds (VOCs) are ubiquitous in the environment and can be of biological origin, including plants (Dudareva et al, 2013), bacteria (Mohnke and Buijten, 1993;Korpi et al, 2009;Insam and Seewald, 2010;Zhang et al, 2017), algae, and marine organisms (Whelan, 1984;Kidanu et al, 2017); or anthropogenic origin (Kuráň and Soják, 1996;Sattler et al, 2013). VOCs are regarded as atmospheric, and groundwater pollutants and are toxic (McDonald et al, 1988;Thiros, 2000;Pecoraino et al, 2008), even in salt lake brine.…”

Section: Introductionmentioning

confidence: 99%

The Composition and Distribution of Volatile Organic Compounds in Sediments of the East Taijinar Salt Lake in Northern Qinghai-Tibet Plateau

et al. 2021

Front. Environ. Chem.

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The main objective of this study was to explore the composition and distribution of volatile organic compounds (VOCs) and the factors that affect their distribution in the salt lake sediments. Thirteen sediment samples were collected from a depth profile in the East Taijinar Lake, China. VOCs of different samples were extracted by headspace solid phase microextraction. Gas chromatography-ion mobility spectrometry, gas chromatography-mass spectrometry, and X-ray diffraction were used to analyze the VOCs, n-alkanes, and minerals present in samples. Thirty-four VOCs were identified and classified into seven types, including terpenes, furans, esters, aldehydes, ketones, alcohols, and acids, apart from six contaminants. It was found that 24 of the most prevalent compounds in clay were on average 101.45% higher than those in sandstone and halite because of the sedimentary environment, while the remaining ten (2-acetylfuran, 2-pinene D, etc.) were on average 13.27% higher in sandstone and halite sediments than in clay. This can be attributed to their different biological sources, porosity, and higher salinity. Based on the Q-cluster analysis, the 13 sediment samples were split into two groups, including the group according to composition and the group based on distribution of VOCs. In this study, it was found that the VOCs correlate positively with detrital minerals, with Group I exhibiting a high content of detrital minerals (>25%), while Group II showed the opposite characteristics. The consumption of organic matter (OM) by microorganisms leads to the formation of VOCs in sediment. The values of carbon preference index and n-alkane further demonstrate that the organic matter of the two groups came from different sources, exogenous and endogenous. Pr/Ph ratios, Pr/C17, and Pr/C18 also suggest that the OM in all sediments was strongly affected by microorganisms in an anoxic environment. Together, these results demonstrate that the OM from different biological sources and microbial activities played a critical role in deciding the composition and distribution of VOCs in the sediment. This study also shows that the proportion of VOCs in halite was discernably higher than that in clay and sandstone and that the content of VOCs should be considered when studying OM in salt lake sediments.

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“…41 A commonly used methanogenic inhibitor such as 2bromoethanesulfonate (BES) is a coenzyme M analog that acts as a competitive inhibitor in methyl transfer reactions. 42 βcyclodextrin was also demonstrated as a chemical methanogenic inhibitor to improve hydrogen and VFA production by Kidanu et al (2017). 43 However, the market cost of β-cyclodextrin is high (∼ €1250/kg in 2022).…”

Section: Effect Of Seleniummentioning

confidence: 99%

Influence of pH, Heat Treatment of Inoculum, and Selenium Oxyanions on Concomitant Selenium Bioremediation and Volatile Fatty Acid Production from Food Waste

Logan,

Zhu,

Lens

et al. 2023

ACS Omega

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Developing novel strategies to enhance volatile fatty acid (VFA) yield from abundant waste resources is imperative to improve the competitiveness of biobased VFAs over petrochemical-based VFAs. This study hypothesized to improve the VFA yield from food waste via three strategies, viz., pH adjustment (5 and 10), supplementation of selenium (Se) oxyanions, and heat treatment of the inoculum (at 85 °C for 1 h). The highest VFA yield of 0.516 g COD/g VS was achieved at alkaline pH, which was 45% higher than the maximum VFA production at acidic pH. Heat treatment resulted in VFA accumulation after day 10 upon alkaline pretreatment. Se oxyanions acted as chemical inhibitors to improve the VFA yield at pH 10 with non-heat-treated inoculum (NHT). Acetic and propionic acid production was dominant at alkaline pH (NHT); however, the VFA composition diversified under the other tested conditions. More than 95% Se removal was achieved on day 1 under all the conditions tested. However, the heat treatment was detrimental for selenate reduction, with less than 15% Se removal after 20 days. Biosynthesized Se nanoparticles were confirmed by transmission and scanning electron microscopy and and energy dispersive X-ray analyses. The heat treatment inhibited the presence of nonsporulating bacteria and methanogenic archaea (Methanobacteriaceae). High-throughput sequencing also revealed higher relative abundances of the bacterial families (such as Clostridiaceae, Bacteroidaceae, and Prevotellaceae) that are capable of VFA production and/or selenium reduction.

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Hydrogen and volatile fatty acids production from marine macroalgae by anaerobic fermentation

Cited by 26 publications

References 35 publications

Efficient Conversion of Acetate to 3-Hydroxypropionic Acid by Engineered Escherichia coli

Efficient Conversion of Acetate to 3-Hydroxypropionic Acid by Engineered Escherichia coli

The Composition and Distribution of Volatile Organic Compounds in Sediments of the East Taijinar Salt Lake in Northern Qinghai-Tibet Plateau

Influence of pH, Heat Treatment of Inoculum, and Selenium Oxyanions on Concomitant Selenium Bioremediation and Volatile Fatty Acid Production from Food Waste

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