Search results for "Agaricus"
showing 6 items of 6 documents
Reactions of Flavonoids with o‑Quinones Interfere with the Spectrophotometric Assay of Tyrosinase Activity
2016
Flavonoids are important food components with antioxidant properties and many of them have been described as tyrosinase inhibitors. Oxidation of quercetin, kaempferol, morin, catechin, and naringenin by mushroom tyrosinase and their influence on the oxidation of l-dopa and l-tyrosine was studied. Reaction rates measured spectrophotometrically and by oxygen consumption differed substantially. All tested flavonoids reacted with 4-tert-butyl-o-benzoquinone and/or 4-methyl-o-benzoquinone, although at different rates. These reactions generated products whose UV-vis spectra either overlapped or did not overlap with the spectrum of dopachrome. They therefore strongly influence the kinetic analysis…
First Report of Agaricus aridicola in Saudi Arabia and Ecological Notes on Agaricus bisporus
2015
Agaricus aridicola is reported for the first time from Saudi Arabia while Agaricus bisporus is a new record for Northern region of Saudi Arabia. This study includes notes on taxonomy, ecology and distribution of both the species. It was also reported that the habitat of A. aridicola and A. bisporus are characterized by calcareous sandy soil, poor in organic matter, with presence of little amount of salinity.
Historical remarks, orginal description and last advances on Pleurotus nebrodensis
2013
Giuseppe Inzenga, the scientist who first described Pleurotus nebrodensis, was one of the major mycologists of the second half of the 19th century. This chapter describes the main biographical aspects of the life of Inzenga and its contribution to science with particular reference to mycology. The chapter also includes notes on the social and academic context of the mid-1800s, which led Inzenga to the original description of P. nebrodensis, the analysis of the critical aspects of nomenclature and the logical path that led us to the recent designation of a P. nebrodensis epitype. An updated description of the taxon and the discovery of the loci classici of P. nebrodensis collections is also …
Mushroom-Based Supplements in Italy: Let’s Open Pandora’s Box
2023
Mushrooms and derivates are well known to the scientific community for having different health benefits and exhibit a wide range of pharmacological activities, including lipid-lowering, antihypertensive, antidiabetic, antimicrobic, antiallergic, anti-inflammatory, anticancer, immunomodulating, neuroprotective and osteoprotective actions. In Europe, medical mushrooms are mainly marketed in the form of food supplements as single components or combined with other nutraceuticals. In this context, the first peculiarity that distinguishes it is the safety established through the “history of consumption” that characterizes that mushroom. However, the cultivation of medicinal mushrooms on a large s…
Evaluation of pulsed electric field-assisted extraction on the microstructure and recovery of nutrients and bioactive compounds from mushroom (Agaric…
2022
Pulsed electric field (PEF) is a sustainable innovative technology that allows for the recovery of nutrients and bioactive compounds from vegetable matrices. A. bisporus was chosen for its nutritional value and the effect of PEF pretreatment was evaluated using different conditions of electric field (2–3 kV/cm), specific energy (50–200 kJ/kg) and extraction time (0–6 h) to obtain the best conditions for nutrient and bioactive compound extraction. Spectrophotometric methods were used to evaluate the different compounds, along with an analysis of mineral content by inductively coupled plasma mass spectrometry (ICP-MS) and the surface was evaluated using scanning electron microscopy (SEM). In …
Biogeneration of 1-octen-3-ol by lipoxygenase and hydroperoxide lyase activities of Agaricus bisporus
2001
Abstract The biogeneration of 1-octen-3-ol by lipoxygenase and associated hydroperoxide lyase activities of a homogenate of the cultivated mushroom Agaricus bisporus was investigated using linoleic acid as a substrate. The optimal substrate and protein concentrations were 1.5 mM and 1.5 mg ml −1 , respectively. The V max value for the enzymic coupled reaction lipoxygenase–hydroperoxide lyase was 6 μg of 1-octen-3-ol ml −1 min −1 , with a K m value of 0.3×10 −3 M. The highest enzymic activity was observed in the presence of pure oxygen (22.9 μg of 1-octen-3-ol ml −1 ), with a bioconversion yield of 36%. The production of 380 μg 1-octen-3-ol per g of mushroom homogenate was demonstrated using…