2016
DOI: 10.1111/1751-7915.12365
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Toxicity of long chain fatty acids towards acetate conversion by Methanosaeta concilii and Methanosarcina mazei

Abstract: SummaryLong‐chain fatty acids (LCFA) can inhibit methane production by methanogenic archaea. The effect of oleate and palmitate on pure cultures of Methanosaeta concilii and Methanosarcina mazei was assessed by comparing methane production rates from acetate before and after LCFA addition. For both methanogens, a sharp decrease in methane production (> 50%) was observed at 0.5 mmol L−1 oleate, and no methane was formed at concentrations higher than 2 mmol L−1 oleate. Palmitate was less inhibitory than oleate, … Show more

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Cited by 58 publications
(32 citation statements)
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“…In this study, Methanosaeta was the dominant aceticlastic group in both codigesters, despite acetate accumulation to over 3,000 mg/L in the CF codigester and periodic acetate accumulation to 500-1,000 mg/L in the PF2 codigester. A higher tolerance to LCFA was reported for pure cultures of Methanosaeta concilii in comparison to Methanosarcina mazei (Silva et al, 2016), which could explain the presence of Methanosaeta rather than Methanosarcina in our study codigesters.…”
Section: Codigester Feeding Frequency and Loading Drove Biological Secontrasting
confidence: 42%
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“…In this study, Methanosaeta was the dominant aceticlastic group in both codigesters, despite acetate accumulation to over 3,000 mg/L in the CF codigester and periodic acetate accumulation to 500-1,000 mg/L in the PF2 codigester. A higher tolerance to LCFA was reported for pure cultures of Methanosaeta concilii in comparison to Methanosarcina mazei (Silva et al, 2016), which could explain the presence of Methanosaeta rather than Methanosarcina in our study codigesters.…”
Section: Codigester Feeding Frequency and Loading Drove Biological Secontrasting
confidence: 42%
“…The bacterial species known to β-oxidize LCFA in syntrophy with a hydrogen-or formate-consuming partner have so far been identified within only two families, Syntrophomonadaceae and Syntrophaceae (Sousa et al, 2009). The slower biodegradation of LCFA relative to lipid hydrolysis in anaerobic digesters can lead to LCFA accumulation and process instability, as LCFA are known inhibitors of hydrogenotrophic and aceticlastic methanogenic activity at high concentrations (Hanaki et al, 1981;Hwu and Lettinga, 1997;Silva et al, 2016;Sousa et al, 2013). LCFA accumulation can also limit the kinetics of syntrophic βoxidizing bacteria (Hanaki et al, 1981).…”
Section: Introductionmentioning
confidence: 99%
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“…However, there are examples where Methanothrix seems to be more resistant. Methanothrix is more resistant to longchain fatty acids (Silva et al 2016) and humic substances (Azman et al 2017) than Methanosarcina. The higher tolerance in these cases was thought to be related to the different cell wall structure.…”
Section: Physiological Propertiesmentioning
confidence: 99%
“…However, there are examples where Methanothrix seems to be more resistant. Methanothrix is more resistant to longchain fatty acids (Silva et al 2016) and humic substances (Azman et al 2017) than Methanosarcina. The higher tolerance in these cases was thought to be related to the different cell wall structure.…”
Section: Physiological Propertiesmentioning
confidence: 99%