Functional foods such as mushrooms are rich in polyphenolic compounds and secondary metabolites with health-promoting properties such as antioxidant, antimicrobial, antidiabetic and immunostimulatory effects. The present study is aimed to investigate the ethanolic extracts of three varieties of mushrooms, namely, G. lucidum, G. tropicum, and C. indica grown in Bangladesh for phenolic and flavonoid content and their antioxidant properties. Moreover, the phenolic composition of the extracts was analyzed by using the HPLC-DAD system. G. lucidum extract exhibited the highest antioxidant potential as evidenced by its lowest IC50 value in all the tested assay models (
40.44
±
2.09
μg/mL,
151.32
±
0.35
μg/mL,
137.89
±
1.85
μg/mL in DPPH, H2O2, and NO scavenging assay, respectively) along with the highest phenolic content (
81.34
±
0.68
GAE g-1 extract). G. tropicum and C. indica extracts also showed significant antioxidant properties and a good amount of phenolic content,
52.16
±
0.25
GAE g-1 extract, and 47.1 ± 0.26 GAE g-1 extract, respectively. The scavenging activity increased with the increasing concentration of extracts in all cases. The total phenolic content of the ethanolic extracts of mushroom species was highly correlated with antioxidant effects with Pearson’s correlation coefficient (
r
) values ranging from 0.8883–0.9851. The α-amylase inhibitory and antibacterial activity of G. lucidum was evaluated by using 3,5-dinitrosalicylic acid and disc diffusion method, respectively. The maximum inhibitory activity recorded against α-amylase was
70.98
±
0.042
%
at a concentration of 500 μg/mL. G. lucidum extract exhibited the highest antibacterial activity against Pseudomonas aeruginosa with
23.00
±
1.00
mm clear zone of inhibition and an MIC value of 3.5 mg/mL. The results indicate that the mushroom species tested in this study could serve as a potential source of natural antioxidants in the development of nutraceuticals and herbal drugs for the management of oxidative stress-associated diseases as well as infectious diseases.
The current study was directed on methanolic extract of Neolamarckia cadamba fruits, belonging to the family Rubiaceae, to reveal the possible phytochemicals existence and also to evaluate the membrane stabilizing, anthelmintic, antioxidant properties. To estimate the membrane stabilizing activity, both heat and hypotonic solution induced haemolysis techniques were used. The anthelmintic test was conducted on earthworm Pheritima phosthuma using five different concentrations (10, 20, 40, 60, 80 mg/ml) of the extract and albendazole as standard drug (concentration 10 mg/ml). To investigate antioxidant property, two potential tests namely total phenolic content determination and the 2,2diphenylpicrylhydrazyl (DPPH) free radical scavenging assay were conducted. Phytochemical screening was carried out using different chemical group tests. The extract revealed good membrane stabilizing activity inhibiting both hypotonic solution and heat induced haemolysis in comparison to inhibition by standard acetyl salicylic acid. The methanolic extract showed potent anthelmintic activity at the highest concentration as it required less time for paralysis and death compared to the standard drug albendazole. The fruit extract showed potential antioxidant property. The analysis of phytochemicals reveals the presence of carbohydrate, phenol, phytosterol, protein and amino acid, terpene and glycoside. The results of the study showed that the plant extract has potential membrane stabilizing, antihelmintic, antioxidant activities along with the presence of significant phytochemicals.
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