Brewer's yeast was subjected to analytical studies to determine the chemical composition of its biomass. To this end, traditional methods of analysis were used to determine ribonucleic acid (RNA), mineral elements, amino acids and fatty acids. The results showed that proteins (49.63%), carbohydrates (31.55%), minerals (7.98%), RNA (8.12%) and total lipids (4.64%) predominate in the biomass composition. The amino acid profile of the protein is suitable for human nutrition, exceeding the recommendations from the FAO/WHO/UNU for essential amino acids. It is particularly rich in lysine and could be recommended as protein supplement in cereals. It was also observed that the yeast was an excellent source of some microelements, such as selenium, chromium, nickel and lithium; that it is also a good source of dietary fiber, particularly soluble fibers; and that the content of lipids was low, with a predominance of saturated and mono-unsaturated fatty acids with 10, 16 and 18 carbon atoms.
Abstract- 89±1.21; 4.89 ± 0.29; 2.67 ± 0.68 and 4.19 ± 0.56, represented in g.100g -1 respectively. The energy values obtained were 109.23± 4.23 kcal.100g -1 . As such, the conclusion can be drawn that brewers' spent grain can be used in both animal and human food.
Poultry litter, a waste product from broiler farming, can be transformed into biogas when subjected to anaerobic biodigestion. This study proposes to evaluate the potential of poultry litter for energy generation in order to meet the energy demands of the poultry production chain in the southwest region of the state of Parana-Brazil, when used as a substrate for the production of biogas. Based on the volumes of biogas produced, the viability of biogas production was determined. The results reveal that the anaerobic biodigestion process was efficient in biogas production. It was also possible to determine that the use of poultry litter in biogas production is viable, since the raw material for its production is available in the entire southwest region of Paraná. The presentation of the three treatments proved to be important, because in the three systems the production of significant quantities of biogas was possible, constituting a potential replacement for non-renewable fuel sources derived from petroleum.
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