Constituents, Nutrient Content, and In Vitro Antioxidant and Anti-Inflammatory Activity of Tricholomopsis aurea (Agaricomycetes) from Cameroon.

Abstract

Tricholomopsis aurea is used as food in different parts of the world, but has not been investigated for its nutrients, metabolites, and biological potentials like other edible mushrooms. This work aimed to quantify the metabolic and nutrient content of T. aurea and evaluate the antioxidant and anti-inflammatory activities of the extract and isolated compounds. The method employed involves chromatographic, spectroscopic, bovine serum albumin microplate, analytical and standard assays. Oleic, elaidic, petroselinic acids, ergosterol, ergosterol peroxide, 22E724R)-24-ethylcholesta-5,7,22-trien-3β-ol, and adenosine were isolated and identified using 1D and 2D-NMR spectroscopy and spectrometric data. The metabolic content revealed high phenolics (799.62 μgGaE/g of dry matter (DM)), low flavonoids (24.54 μgQE/g DM), alkaloids (32.92 μgQiE/g DM), and saponins (88.00 μgQSE/g DM). The nutrients content was made up of proteins (4.79%), lipids (10.43%), fibers (16.01%), ashes (15.96%), carbohydrates (8.74%), dry matter (85.93%), and moisture (14.07%) with energy value of 362.89 kcal. In mg/100 g, the minerals were phosphorus (283.97%), calcium (817.25%), potassium (67.10%), magnesium (94.42%), iron (57.27%), and sodium (74.4%). The extract displayed the antioxidant activity against TAC and FRAP (100-1000 μg/mL), DPPH (SC50 of 248.95 μg/mL) and ABTS (SC50 of 180.7 μg/mL), while the test compounds were not active. The extract, adenosine, ergosterol peroxide, and ergosterol showed anti-inflammatory activity with IC50 of 49.19 μg/mL, 4.91 μg/mL, 6.85 μg/mL, and 29.51 μg/mL, respectively. Conclusively, this study will help to promote the application of T. aurea in traditional dishes and functional or nutraceutical foods.