Abstract:The use of hemicellulosic hydrolysates in bioprocesses requires supplementation as to ensure the best fermentative performance of microorganisms. However, in light of conflicting data in the literature, it is necessary to establish an inexpensive and applicable medium for the development of bioprocesses. This paper evaluates the fermentative performance of Scheffersomyces (Pichia) stipitis and Candida guilliermondii growth in sugarcane bagasse hemicellulosic hydrolysate supplemented with different nitrogen sou… Show more
“…(a)), while arabinose (data not shown) was not assimilated by the yeast. The assimilation of arabinose by other species of genus Scheffersomyces is not very common, and similar behavior was also observed in S. stipitis , which is commonly used for producing bioethanol from hemicellulosic hydrolysates …”
Section: Resultsmentioning
confidence: 58%
“…The formation and consumption of ethanol and glycerol during xylitol production by C. guilliermondii has been previously reported, as well as glycerol formation by S. stipitis during the fermentation of hemicellulosic hydrolysates from sugarcane bagasse to produce ethanol . Both glycerol and ethanol are expected as byproducts from xylose metabolism for some yeasts, whose production is linked to the glycolytic pathway.…”
Section: Resultsmentioning
confidence: 77%
“…The assimilation of arabinose by other species of genus Scheffersomyces is not very common, 34,35 and similar behavior was also observed in S. stipitis, which is commonly used for producing bioethanol from hemicellulosic hydrolysates. [36][37][38][39] Consumption of 96% of the acetic acid was also observed at 96 h (see Fig. 3(a)).…”
“…(a)), while arabinose (data not shown) was not assimilated by the yeast. The assimilation of arabinose by other species of genus Scheffersomyces is not very common, and similar behavior was also observed in S. stipitis , which is commonly used for producing bioethanol from hemicellulosic hydrolysates …”
Section: Resultsmentioning
confidence: 58%
“…The formation and consumption of ethanol and glycerol during xylitol production by C. guilliermondii has been previously reported, as well as glycerol formation by S. stipitis during the fermentation of hemicellulosic hydrolysates from sugarcane bagasse to produce ethanol . Both glycerol and ethanol are expected as byproducts from xylose metabolism for some yeasts, whose production is linked to the glycolytic pathway.…”
Section: Resultsmentioning
confidence: 77%
“…The assimilation of arabinose by other species of genus Scheffersomyces is not very common, 34,35 and similar behavior was also observed in S. stipitis, which is commonly used for producing bioethanol from hemicellulosic hydrolysates. [36][37][38][39] Consumption of 96% of the acetic acid was also observed at 96 h (see Fig. 3(a)).…”
“…In sequence, the solution was transferred to smaller containers, and yeast from the yeast-malt extract agar (YMA) culture was added to the medium. The Erlenmeyer flasks were kept under an agitation of 200 rpm and a temperature of 30 °C for 24 h [ 48 ].…”
Recent years have seen an increase in the use of lignocellulosic materials in the development of bioproducts. Because sisal fiber is a low cost raw material and is readily available, this work aimed to evaluate its hemicellulose fraction for the simultaneous production of xylitol and ethanol. The sisal fiber presented a higher hemicellulose content than other frequently-employed biomasses, such as sugarcane bagasse. A pretreatment with dilute acid and low temperatures was conducted in order to obtain the hemicellulose fraction. The highest xylose contents (0.132 g·g−1 of sisal fiber) were obtained at 120 °C with 2.5% (v/v) of sulfuric acid. The yeast Candida tropicalis CCT 1516 was used in the fermentation. In the sisal fiber hemicellulose hydrolysate, the maximum production of xylitol (0.32 g·g−1) and of ethanol (0.27 g·g−1) was achieved in 60 h. Thus, sisal fiber presents as a potential biomass for the production of ethanol and xylitol, creating value with the use of hemicellulosic liquor without detoxification and without the additional steps of alkaline pretreatment.
“…Lignin is a complex amorphous polymer whose structure is not fully known. It provides rigidity and strength to all cellulose fibers . Lignin is always associated with hemicellulose in physical mixtures and chemical bonds .…”
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