Bioconversion of lignocellulosic fraction of water-hyacinth (Eichhornia crassipes) hemicellulose acid hydrolysate to ethanol by Pichia stipitis

Ethanol production by a new pentose‐fermenting yeast strain, Scheffersomyces stipitis UFMG‐IMH 43.2, isolated from the Brazilian forest

“…Saccharomyces cerevisiae is the most commonly used ethanol producer microorganism, but it may not be used for hemicellulosic hydrolysates fermentation, since this medium contain a mixture of hexose and pentose sugars and S. cerevisiae cannot ferment pentoses (Kumar et al, 2009). Therefore, during the last two decades, research has been focused on finding xylose-fermenting microorganisms and understanding their xylose metabolism.…”

Biohydrogen Productions from Hydrolysate of Water Hyacinth Stem (Eichhornia crassipes) Using Anaerobic Mixed Cultures

“…After hydrolysis, a solid residue was separated from the liquid phase (hydrolysate) by filtration through a thin layer cloth. Prior to being used as the substrate for hydrogen production, the hydrolysate was heated at 100°C for 15 min in order to remove or reduce the concentration of volatile components (furfural and phenolic compounds) (Kumar et al 2009). The pH of acid hydrolysate was then adjusted to 10 by a combination of solid Ca(OH) 2 and 0.1% sodium sulfite.…”

“…The precipitate was removed by filtration through a thin layer cloth. The resulting filtrate was re-acidified to pH 6.0 (Kumar et al 2009) and was then concentrated at 70°C. (1):…”

“…It also restricts the possibilities of fishing from the shore with baskets or lines (Aweke 1993) and can cause hygienic problems (Abdelhamid & Gabr 1991). The most common use of water-hyacinth is raw material for composting and substrate for biogas (Abdelhamid & Gabr 1991) and bioethanol production (Kumar et al 2009;Zhao et al 2009). Water-hyacinth consists of three main fractions i.e.…”

“…It has a high content of hemicellulose (30-55% of dry weight), which further pretreated and obtained hemicellulosic sugars as a by-product (Kumar et al 2009). Dilute acid treatment of hemicellulose fraction in water-hyacinth yields a solution containing mainly xylose and glucose (Kumar et al 2009). Glucose and xylose were reported as a substrate for producing hydrogen by various types of microorganisms such as pure culture i.e.…”