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    Enhancing nutritional value and flavor profiles of whey powder through fungal fermentation with Aspergillus oryzae and Neurospora intermedia
    (Sage Publications Ltd, 2025) Kaya, Burcu; Guneser, Onur; Taherzadeh, Mohammad J.; Karagul Yuceer, Yonca; Sar, Taner
    Investigation of the nutritional properties, biological activities, volatile compounds and sensory properties of fungal biomass and supernatants obtained from cheese whey powder fermented with Aspergillus oryzae and Neurospora intermedia was aimed in this study. The biomass produced by A. oryzae exhibited higher total lipid (118.54 g/kg) and total essential amino acid (62.05 g/kg) contents improve in comparison to N. intermedia. In contrast, the N. intermedia biomass showed superior bioactive properties, with the highest levels of total phenolics (4.72 mg gallic acid/g dry basis), total flavonoids, (23.85 mg quercetin/dry basis), and antioxidant activities (221.49 mg Trolox/g dry basis). Furthermore, the A. oryzae biomass derived from whey powder significantly enhanced the concentration of 1-octen-3-ol from 15.64 to 129.35 mu g/kg, indicating its potential for improving the flavor profiles of food products with a natural mushroom-like aroma. Whey powder fermented with A. oryzae and N. intermedia contained significant amounts of calcium, sodium, and magnesium. The dominant mineral in the supernatant was Mg (7.40-7.90 mg/L) and a distinct fruity aroma was observed especially in the N. intermedia supernatant. These findings highlight the potential of fungal fermentation to convert dairy industry byproducts into nutrient-dense, flavor-enhancing alternatives.
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    The use of cheese whey powder in the cultivation of protein-rich filamentous fungal biomass for sustainable food production
    (Frontiers Media Sa, 2024) Kaya, Burcu; Wijayarathna, E. R. Kanishka B.; Karagül Yüceer, Yonca; Agnihotri, Swarnima; Taherzadeh, Mohammad J.; Sar, Taner
    Cheese whey is an industrial by-product that is generated in excess during the cheese production process in the dairy industry. Despite the potential utility of whey, it continues to pose environmental threats in the industry. This study comprehensively evaluates the utilization of two fermentation techniques (solid-state fermentation and submerged fermentation) for producing fungal biomass from cheese whey powder, employing Aspergillus oryzae, Rhizopus oryzae, and Neurospora intermedia for sustainable food production. It has been observed that submerged fermentation is more effective in increasing the protein content of whey powder compared to solid-state fermentation. The highest biomass yield was achieved with A. oryzae (5.29 g/L, 0.176 g biomass/g substrate), followed by N. intermedia (3.63 g/L, 0.121 g biomass/g substrate), and R. oryzae (1.9 g/L, 0.063 g biomass/g substrate). In the bubble column reactor, the protein content of the substrate (78.65 g/kg) increased by 165.54 and 176.69% with A. oryzae (208.85 g/kg) and N. intermedia (217.62 g/kg), respectively. This study has demonstrated that whey powder can be converted into protein-rich biomass through fungal bioconversion. The obtained biomass has the potential to be developed as an alternative food and feed source, contributing to waste management and sustainable food production.