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Butyric acid fermentation from pretreated and hydrolysed wheat straw by an adapted Clostridium tyrobutyricum strain.

Baroi GN, Baumann I, Westermann P, Gavala HN - Microb Biotechnol (2015)

Bottom Line: Butyric acid is a valuable building-block for the production of chemicals and materials and nowadays it is produced exclusively from petroleum.Pretreated (by wet explosion) and enzymatically hydrolysed wheat straw (PHWS), rich in C6 and C5 sugars (71.6 and 55.4 g l(-1) of glucose and xylose respectively), was used as substrate.Specifically, the butyric acid yield at 60-80% PHWS lie between 0.37 and 0.46 g g(-1) of sugar, while the selectivity for butyric acid was as high as 0.9-1.0 g g(-1) of acid.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry and Bioscience, Aalborg University (AAU), A.C. Meyers Vaenge 15, DK 2450, Copenhagen, SV, Denmark.

No MeSH data available.


Related in: MedlinePlus

Yields of butyric and acetic acids and selectivity of butyric acid under different pH values.
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fig04: Yields of butyric and acetic acids and selectivity of butyric acid under different pH values.

Mentions: Figure 4 shows that there was not any significant difference (p = 0.797, student’s T-test, tails-2, type-2 ) in butyric acid yields at pH 6 and 7, which were 0.45 ± 0.01 and 0.45 ± 0.01 g g−1 respectively. Butyric acid selectivity was high, 92.5 ± 1% and 88.9 ± 1.8% at pH 7 and pH 6 respectively. On the other hand, the yield of butyric acid at pH 5 was 0.39 ± 0.01 g g−1 which was significantly lower (p value less than 0.002) compared with the yields obtained at pH 6 and pH 7. As anticipated, the selectivity at pH 5 was also lower (79.8 ± 2.4%) in comparison with those obtained at pH 6 and pH 7. This could be attributed to lower phosphotransacetylase (PTA) activity, observed during the growth of C. tyrobutyricum on a synthetic, xylose-based growth medium, which results in elevated acetic acid yields (Zhu and Yang, 2004).


Butyric acid fermentation from pretreated and hydrolysed wheat straw by an adapted Clostridium tyrobutyricum strain.

Baroi GN, Baumann I, Westermann P, Gavala HN - Microb Biotechnol (2015)

Yields of butyric and acetic acids and selectivity of butyric acid under different pH values.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4554475&req=5

fig04: Yields of butyric and acetic acids and selectivity of butyric acid under different pH values.
Mentions: Figure 4 shows that there was not any significant difference (p = 0.797, student’s T-test, tails-2, type-2 ) in butyric acid yields at pH 6 and 7, which were 0.45 ± 0.01 and 0.45 ± 0.01 g g−1 respectively. Butyric acid selectivity was high, 92.5 ± 1% and 88.9 ± 1.8% at pH 7 and pH 6 respectively. On the other hand, the yield of butyric acid at pH 5 was 0.39 ± 0.01 g g−1 which was significantly lower (p value less than 0.002) compared with the yields obtained at pH 6 and pH 7. As anticipated, the selectivity at pH 5 was also lower (79.8 ± 2.4%) in comparison with those obtained at pH 6 and pH 7. This could be attributed to lower phosphotransacetylase (PTA) activity, observed during the growth of C. tyrobutyricum on a synthetic, xylose-based growth medium, which results in elevated acetic acid yields (Zhu and Yang, 2004).

Bottom Line: Butyric acid is a valuable building-block for the production of chemicals and materials and nowadays it is produced exclusively from petroleum.Pretreated (by wet explosion) and enzymatically hydrolysed wheat straw (PHWS), rich in C6 and C5 sugars (71.6 and 55.4 g l(-1) of glucose and xylose respectively), was used as substrate.Specifically, the butyric acid yield at 60-80% PHWS lie between 0.37 and 0.46 g g(-1) of sugar, while the selectivity for butyric acid was as high as 0.9-1.0 g g(-1) of acid.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry and Bioscience, Aalborg University (AAU), A.C. Meyers Vaenge 15, DK 2450, Copenhagen, SV, Denmark.

No MeSH data available.


Related in: MedlinePlus