Abstract
A cultivated mushroom species, Pleurotus citrinopileatus, is becoming increasingly popular thanks to its attractive colour and medicinal properties. In this study, P. citrinopileatus was grown in a cultivation medium enriched with wheat bran (WB), thymus post-extraction waste (TPEW) and pumpkin post-extraction waste (PPEW) products. The study showed that the post-extraction wastes are a crucial factor determining the accumulation of minerals, the content/profile of low-molecular-weight organic acids (LMWOAs) and phenolic compounds in fruit bodies, thereby increasing their nutritional value. The use of the waste materials significantly increased LMWOAs contents. The sum of LMWOAs under all cultivation mediums increased, especially quinic, malic and citric acids under the 20% PPEW, 25 and 50% TPEW addition. Total phenolic content, phenolic content, as well as the composition and scavenging effect on DPPH radicals, were strongly dependent on the used substrate. The control variant was poor in phenolic compounds, while the supplementation increased the contents and diversity of these metabolites. In the control, only four phenolic compounds were quantified (chlorogenic, gallic, syringic and vanillic acids), while in the supplemented substrates up to 14 different phenolic compounds (caffeic, chlorogenic, p-coumaric, 2,5-dihydroxybenzoic acid, ferulic, gallic, protocatechuic, salicylic, sinapic, syringic, trans-cinnamic and vanillic acids, catechin and rutin).
Highlights
Pleurotus citrinopileatus or P. cornucopiae var. citrinopileatus, known by its common name Golden oyster mushroom, is an edible mushroom belonging to the genus Pleurotus, a member of the Pleurotaceae family and it is commonly found in Asia [1]
The other combinations in the experiment were chaff with the following additions: wheat bran (WB) 20 g, thymus post-extraction waste (TPEW)
A significant between the control and variants growing in enriched substrates
Summary
Pleurotus citrinopileatus or P. cornucopiae var. citrinopileatus, known by its common name Golden oyster mushroom, is an edible mushroom belonging to the genus Pleurotus, a member of the Pleurotaceae family and it is commonly found in Asia [1]. Citrinopileatus, known by its common name Golden oyster mushroom, is an edible mushroom belonging to the genus Pleurotus, a member of the Pleurotaceae family and it is commonly found in Asia [1]. According to FAOSTAT (2016) [2] and USDA [3], world production of the Pleurotus genus reached 27%, which makes this mushroom the second most commonly cultivated mushroom species. The golden oyster mushroom exhibits a high level of polymer degradation which makes it an easy-to-grow species, while its mycelium is characterized by rapid growth [12,13,14,15]. Pleurotus citrinopileatus may be an alternative for cultivation to the most commonly grown Pleurotus ostreatus, Pleurotus pulmonarius and Pleurotus precoce thanks to its attractive colour, its use as an excellent ingredient of mushroom mixtures and high tolerance to extreme cultivation temperatures [5]
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