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    Bioconversion of lavender oil extraction wastes through cultivation of Pleurotus eryngii var. ferulae: Its effects on yield, nutritional content and antioxidant capacity of the mushroom
    (Elsevier, 2024) Atila, Funda; Cetin, Mehmet
    The study was carried out to investigate the effect of growing media prepared by mixing different ratios of poplar sawdust (PS) and lavender extraction wastes such as lavender straw (LS) and lavender flower wastes (LFW), on the cultivation cycle, yield and biological efficiency (BE%), nutritional profil and antioxidant capacity of Pleurotus eryngii var. Ferulae mushroom. Moreover, functional and organic compounds of the fruiting body were examined by FTIR analysis. The mushroom production was experimented with seven different growing media. A raised yield of 216.3 g/kg +/- 6.4 g/kg and BE% of 61.8 +/- 1.8% were recorded in the growing medium where the PS, LS and LWF were used in the ratio of 5:3:2, whereas the maximum protein content (17.94 +/- 0.04 g100 g-1), total phenolic content (5.09 +/- 0.08 mg GAE g-1), ABTS (54.36 +/- 2.39 mu mol TE g-1) and CUPRAC (58.89 +/- 0.91 mu mol TE g-1) were observed in the growing medium prepared with mixture of PS and LS (the ratio of 7:3). Moreover, all the growing media added LS and LFW resulted in improved mushroom yield, the nutritional profile and antioxidant capacity of P. eryngii var. Ferulae when compared to the control medium. According to the results, LS and LFW can be used as efficient, cost-effective and promising substrates for the production of P eryngii var. Ferulae, a valuable medicinal and edible mushroom species.
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    The effect of different LED wavelengths used in the cultivation of Pleurotus ostreatus on quality parameters of the mushroom during the storage process
    (Elsevier, 2024) Cetin, Mehmet; Atila, Funda; Sen, Fatih; Yemen, Sevval
    This study aimed to investigate the effects of light emitting diodes (LEDs) of different wavelengths (white, red, blue and green) used in Pleurotus ostreatus cultivation on post-harvest mushroom quality, storage process and maintenance of mushroom quality characteristics during storage. The mushroom was exposed to different LED wavelengths for 8 and 12 h per day during fructification period. The effects of these treatments were observed during post-harvest and storage periods, focusing on changes in color, weight loss, antioxidant capacity (FRAP), and total phenolic content (TPC). The harvested mushrooms were stored at 1 degrees C for 12 days, and samples were taken every 4 days to analyze mentioned parameters. After harvest, L*,a*,b* values of the fruiting bodies grown under different LEDs ranged 56.5 - 69.8, 2.0 - 3.84, 12.2 - 15.9 respectively, whereas TPC and FRAP values varied from 54.4 to 78.5 mg GAE/100 g fw and 6.14 to 7.59 mu mol TE/g fw, respectively. The values of L*, a*, b*, browning index (BI), and yellowness index (YI) demonstrated a clear postponement of discoloration in the samples exposed to 8 h of red LED and 12 h of green LED compared to the control group at the end of the storage period. The TPC of the fruitbody cultivated under red LED (8 h per day) was markedly increased after 12 days (54.4 to 95.1 mg GAEs/100 g fw), but LEDs did not affect the maintenance of antioxidant capacity in P. ostreatus. The results showed that red LED applied for 8 h per day during the fructification period enhanced TPC with minimal effects on the color during cold storage.
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    Investigation on Reducing Chromium Quantity in Chromium Containing Wastes from Leather Industry Using Oyster Mushroom (Pleurotus ostreatus)
    (Amer Leather Chemists Assoc, 2020) Bayramoglu, Eser Eke; Ozcelik, Anil; Cetin, Mehmet; Eren, Erkan
    In the leather industry, the wastes after the wet blue phase, which are created by the shaving process, are one of the substances that cause environmental pollution. Most of the time, these wastes are buried and may, under some circumstances, cause serious environmental pollution problems. in this study, the chromium in wet blue shaved waste is to be minimized by using oyster mushrooms (Pleurotus ostreatus). Wet blue shaved wastes were mixed with 0.5%, 1%, 1.5% and 2% doses into the growth medium. After the oyster mushroom growth, the consumption of chromium from the growth media and uptaken by the mushrooms were investigated with Ege University Argefar Lab.'s House Method using a ICP-MS.
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    Recycling biotoxic green walnut husks through mushroom cultivation and impact of these wastes on yield and nutritional composition of Pleurotus spp.
    (Elsevier, 2024) Atila, Funda; Cetin, Mehmet
    The aim of the study was the bioconversion of green walnut husk (GWH) to nutrimental foods through mushroom cultivation technology. Two isolates of Pleurotus ostreatus and three isolates of Pleurotus eryngii cultivated in four different growing media supplemented different ratios of GWH were investigated for cultivation cycle, yield, biological efficiency (BE), fruiting body properties and nutritional composition of Pleurotus spp. In the study, poplar sawdust (PS) was used as a base substrate, and GWH were added at the ratios of 9:1, 8:2 and 7:3 to prepare the growing media. The control medium was prepared using PS only. Although increasing the GWH content led to prolonged pinning and flushing times, the addition of GWH at 10 -20% ratios had a positive impact on mushroom performance. The yield and BE (%) of P. ostreatus and P. eryngii isolates ranged between 120.2 and 230.0 g/kg and 40.1 -74.2% BE and 121.8 -222.5 g/kg and 40.6 -76.2% BE, respectively, depending on the growing medium used. Moreover, the fruitbodies of both strains of P. ostreatus demonstrated significant increases in protein and fat content when produced on substrates containing GWH, especially at a 20% ratio in the growing medium. These results indicate that GWH, an agricultural waste that poses a risk to the environmental health, could be successfully used in the cultivation of both oyster mushroom species.
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    Valorization of liquid waste generated from biogas production as supplemental material in shiitake mushroom cultivation
    (Elsevier, 2024) Atila, Funda; Cetin, Mehmet
    The aim of the study is to investigate the effect of supplementation of growing media with different levels of biogas liquid waste (BLW) on the production of two commercial strains of shiitake (LE-Agroma and LEHomegreen). The strains were cultivated on oak sawdust (OS) soaked with water containing 0, 2.5, 5, and 10% percentages of BLW and the effect of different treatments was evaluated for cultivation cycle, yield, biological efficiency, nutritional content, macro- micro element contents and accumulation of heavy metals in the fruiting body. The shortest cultivation cycle for shiitake mushrooms, i.e., 82.3 and 75.6 days, was obtained with 10% BLW treatment in LE-Agroma and LE-Homegreen, respectively. The strains displayed the highest yield and BE (297.82 g kg- 1-87.6% and 225.89 g kg- 1-75.8%, respectively) in the same treatments. The use of BLW positively affected the fat, carbohydrate, macro and micro element contents of shiitake strains, whereas its increased supplementation inversely affected the protein content of the fruiting body. Accordingly, the left-over BLW after biogas production can be successfully used as an additive to cultivate shiitake mushrooms, with no risk to human health.