A detailed study on multifaceted bioactivities of the extracts and isolated compounds from truffle Reddellomyces parvulosporus

Impact of ultrasonication on the contents, profiles and biofunctional properties of free and bound phenolics from white desert truffle (Tirmania nivea) and its protein fractions

The molecular and biofunctional properties of protein and phenolic fractions in edible truffles remain largely unknown. This study examined the effect of ultrasonication on the contents, profiles, and bioactive properties of free and bound phenolics (FP and BP) from desert truffle (Tirmania nivea) and its protein fractions. Protein fractions from the Osborne extraction scheme were biochemically and structurally characterized. The albumin fraction showed the highest abundance (16.8%) and yield (35.8%). Total phenolic contents were the highest in non-sonicated samples (3.5-34.1 mg/g), particularly in the albumin fraction and in whole truffle. FP extracted at 30 °C (FP-30 °C) accounted for the largest proportion of total phenolics in all protein fractions, whereas BP-30 °C and FP-60 °C were predominant in non-sonicated and sonicated truffle, respectively. The highest antioxidant activity was obtained with FP-30 °C extracts from non-sonicated albumins, globulins and truffle (91.9, 72.7 and 30.0%), followed by BP-30 °C from non-sonicated albumins (25.4%) and FP-60 °C from sonicated glutelins-1 (24.2%). High inhibition of α-amylase was evidenced in several extracts, including FP-30 °C from non-sonicated glutelins-1 (99.2%) and FP-30 °C from sonicated globulins (72.4%). Several extracts also displayed high inhibition of angiotensin I-converting enzyme (ACE), including FP-60 °C from non-sonicated glutelins-1 (65.1%) and sonicated glutelins-1 (71.1%) and globulins (64.7%). Most extracts were rich in epicatechin, gallic acid, chlorogenic acid and catechin. Correlations between phenolic content, antioxidant activity, anti-α-amylase and anti-ACE activities were influenced by sonication. Sonication reduced the particle size of the proteins and modified their structural characteristics. These findings demonstrate that white desert truffle proteins co-occur with bioactive phenolics whose functionalities can be tailored by protein fractionation and sonication.

Study on Phenolic and Organic Acid Compositions and Antioxidant and Enzyme Inhibition Activities of Agaricomycetes Mushroom Species from Turkey

Mushrooms stand out as one of nature's best gifts among the natural product sources with their diversity, therapeutic values and increasing popularity. In this study, antioxidant (ABTS·+ scavenging, β-carotene-bleaching, cupric-reducing antioxidant capacity (CUPRAC), DPPH· scavenging, and metal chelating assays), and enzyme (buty-rylcholinesterase (BChE) and acetylcholinesterase (AChE), α-amylase and α-glucosidase) inhibition activities of the extracts obtained from Coprinus comatus (O.F. Müll.) Pers., Cerrena unicolor (Bull.) Murrill, Inocutis rheades (Pers.) Fiasson & Niemela and Leptoporus mollis (Pers.) Quél. mushroom species were investigated. The presence of phenolic and organic acid compounds associated with the bioactive properties of the mushroom species was determined by HPLC-DAD. Fumaric acid was found to be prominent compound in C. comatus (43.90 µg/g dw) and C. unicolor (659.9 µg/g dw), vanillin in L. mollis (19.48 µg/g dw), and p-coumaric acid in I. rheades (21.32 µg/g dw). L. mollis methanol extract, as well as higher antioxidant activity than the standards in CUPRAC and β-carotene-bleaching assays, was noted as superior antioxidant active in all assays (except metal chelating). C. comatus possessed the highest inhibition activity on α-amylase (IC50: 0.23 mg/mL for methanol extract), AChE (IC50: 125.50 µg/mL for hexane extract), and BChE (IC50: 61.03 µg/mL for methanol extract). Also, C. comatus methanol (IC50: 0.09 mg/mL) and L. mollis hexane (IC50 : 0.11 mg/ mL) extracts were better α-glucosidase inhibition active than the acarbose (IC50: 0.37 mg/mL). Our study ascertained that the studied mushroom species are particularly sources of biochemically active compounds with therapeutic potential.

Structure and Biological Activity of Ergostane-Type Steroids from Fungi

Mushrooms are known not only for their taste but also for beneficial effects on health attributed to plethora of constituents. All mushrooms belong to the kingdom of fungi, which also includes yeasts and molds. Each year, hundreds of new metabolites of the main fungal sterol, ergosterol, are isolated from fungal sources. As a rule, further testing is carried out for their biological effects, and many of the isolated compounds exhibit one or another activity. This study aims to review recent literature (mainly over the past 10 years, selected older works are discussed for consistency purposes) on the structures and bioactivities of fungal metabolites of ergosterol. The review is not exhaustive in its coverage of structures found in fungi. Rather, it focuses solely on discussing compounds that have shown some biological activity with potential pharmacological utility.