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Payel Mitra

Other affiliations: Visva-Bharati University
Bio: Payel Mitra is an academic researcher from University of Calcutta. The author has contributed to research in topics: DPPH & Ascorbic acid. The author has an hindex of 7, co-authored 15 publications receiving 135 citations. Previous affiliations of Payel Mitra include Visva-Bharati University.

Papers
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Journal ArticleDOI
TL;DR: The PS exhibited antioxidant properties and was isolated from the aqueous extract of an edible mushroom Termitomyces clypeatus using total hydrolysis, methylation analysis, Smith degradation, and 1D/2D NMR experiments.

26 citations

Journal Article
TL;DR: In this paper, the authors investigated the antioxidant activity using different in vitro assays and nitric oxide synthase activation property of crude water soluble polysaccharide from P ostreatus.
Abstract: The aim of this study was to investigate the antioxidant activity using different in vitro assays and nitric oxide synthase activation property of crude water soluble polysaccharide from P. ostreatus. The polysaccharide was isolated by hot water extraction and physico-chemical investigation revealed that it contained high amount of carbohydrate (mostly β-glucan) and low amount of protein and phenolic compounds. EC50 values for scavenging of hydroxyl radical and superoxide radical as well as chelating ability of ferrous ion were 665, 390 and 370 µg/ml respectively. The polysaccharide also showed potential nitric oxide synthase activation properties. This mushroom might be a good source of bioactive compounds.

26 citations

Journal ArticleDOI
TL;DR: In this paper, a chicken-of-the-woods (Laetiporus sulphureus) extract was extracted using methanol as solvent and mycochemical analysis indicated presence of cardiac glycoside, flavonoid, phenol, saponin and terpenoids in the extract.
Abstract: Traditionally Laetiporus sulphureus, commonly known as “Chicken-of-the-Woods”, is considered a delicacy in various parts of the world and recently has shown medical potential in several treatments such as antitumor, antimicrobial, anti-inflammatory, antioxidant, immune-modulating etc. However, quality standards of this species have not been studied so far. For this purpose, microscopic features of powder such as physical characters, spore measurement, type of hyphae were examined and recorded. Physicochemical parameters like organoleptic features, loss on drying (5.15 %), total ash (3.04 %), swelling capacity (1.66 ml/g), water holding capacity (163.16 g/g), water solubility index (21.73 %) and fluorescent behaviour against 16 reagents were also determined. In addition, alcoholic extract was prepared using methanol as solvent where extractive value was 24.27 %. Preliminary mycochemical analysis indicated presence of cardiac glycoside, flavonoid, phenol, saponin and terpenoids in the extract. While quantitatively major bioactive components were present in the following order of flavonoid > phenol > ascorbic acid > β-carotene > lycopene. Moreover, HPTLC and HPLC profiles were recorded to determine phenolic fingerprint. HPTLC characterization showed presence of at least 5 components as detected by scanning the plate at 300 nm and HPLC chromatogram indicated existence of 32 peaks which might be of phenolic compounds. In addition, superoxide radical scavenging (EC50 1.38 mg/ml), DPPH radical scavenging (EC50 0.11 mg/ml), chelating ability of ferrous ion (EC50 0.27 mg/ml), reducing power (EC50 0.26 mg/ml) and total antioxidant capacity (18.01 µg AAE/mg of extract) were determined to evaluate antioxidant potentiality of the extract. The above parameters are significant towards establishing pharmacognostic standards for future authentication of genuine mushroom material.

21 citations

Journal ArticleDOI
TL;DR: In this paper, three new isostructural pillared binuclear dioxomolybdenum(VI) complexes (MoO2L1)2(4,4′-azpy) and three new Schiff base ligands (H 2L1, H2L2 and H 2L3) have been reported for the first time.
Abstract: Three new isostructural pillared binuclear dioxomolybdenum(VI) complexes [(MoO2L1)2(4,4′-azpy)] (1), [(MoO2L2)2(4,4′-azpy)] (2) and [(MoO2L3)2(4,4′-azpy)] (3) [where, 4,4′-azpy = 4,4′-azobis-(pyridine)] containing tridentate binegative Schiff base ligands (H2L1, H2L2 and H2L3) obtained by the condensation of salicylaldehyde and substituted salicylaldehyde with S-benzyl dithiocarbazate have been reported for the first time. These complexes have been characterized by spectroscopic and electrochemical studies. In all the complexes (1–3), 4,4′-azpy behaves as an auxiliary spacer and bridges the Mo(VI) centers giving rise to neutral 3D supramolecular frameworks. The cavities formed by hydrogen bonding interactions are capable of hosting guest molecules. The crystal structures reveal that each molybdenum site in the binuclear complexes adopts a distorted octahedral geometry. The morphology and structures of the complexes are further examined by SEM. Thermal behavior has been investigated to study the framework stabilities of these structures. Supportive DFT calculations on the complexes have been carried out. These ligands and complexes 1–3 have significant antimicrobial and antioxidant properties.

17 citations

Journal ArticleDOI
TL;DR: In this article, a preliminary chemical investigation was performed and it revealed that the fraction possessed various types of components with maximum amount of phenol and the other found components were in the following consequence flavonoid,ascorbic acid, s-carotene, and l-lycopene.
Abstract: Polyphenol rich fraction of Termitomyces heimii, a wild edible mushroom, was prepared to investigate its antioxidant activity and presence of different bioactive constituents. A preliminary chemical investigation was performed and it revealed that the fraction possessed various types of components with maximum amount of phenol. The other found components were in the following consequence flavonoid > ascorbic acid > s-carotene > lycopene. HPLC data analyses showed presence of cinnamic acid and a good amount of pyrogallol (9603 µg/g of dry tissue of mushroom). The extract showed best hydroxyl radical scavenging activity (EC50 = 0.021 mg/ml). EC50 values for SOD radical scavenging assay was as low as 0.19 mg/ml. That of the rest of the antioxidant assays i.e., DPPH radical scavenging assay and reducing assay were only 0.49 and 1.31 mg/ml respectively. Thus T. heimii can be used as an easily accessible source of natural antioxidants or for the development of a new health medicine for fighting against various human stress related diseases.

13 citations


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TL;DR: M mushrooms antioxidant components are found in fruit bodies, mycelium and culture both, which include polysaccharides, tocopherols, phenolics, carotenoids, ergosterol and ascorbic acid among others, which represent a significant advantage in antioxidant compounds extraction from mushrooms.

160 citations

Journal ArticleDOI
TL;DR: The most common medicinal functions possessed by Chinese macrofungi are antitumor or anticancer, followed by antioxidant and antimicrobial, and these species could be treated as “Gold Mushrooms”.
Abstract: The huge land areas in China provide highly diverse habitats for macrofungi. Of these macrofungi, many are directly related to people’s daily life and have been utilized by ancient Chinese for at least 6800 years. In this study, we evaluate the current known resource diversity of Chinese macrofungi. A total of 1662 taxa are summarized, and all species names and their authorities have been checked and corrected according to authentic mycological databases. Among the 1662 taxa, 1020, 692, and 480 are considered to be edible, medicinal and poisonous mushrooms, respectively. A few of edible macrofungi in China are commonly used for commercial production. All known medicinal functions are labeled for medicinal species. The most common medicinal functions possessed by Chinese macrofungi are antitumor or anticancer, followed by antioxidant and antimicrobial. A total of 277 Chinese macrofungi are edible simultaneously with certain medicinal functions and without known toxicity. These species could be treated as “Gold Mushrooms”. Contrarily, 193 edible and/or medicinal species are also recognized as poisonous mushrooms. To avoid poisoning caused by these species, ingestion either in a proper way or in small amounts is important. However, the mycotoxins metabolized by these poisonous species could be a huge wealth of natural products yet to be explored. How to utilize these Chinese macrofungal resources is a critical to benefit humans worldwide.

159 citations

Journal Article
TL;DR: This review exposes the high nutritional values of P. ostreatus, in relation to their potential medicinal usage which suggest that the P. Ostreatus mushrooms are the most important nutraceutical functional foods.
Abstract: Mushrooms constitute an integral part of the normal human diet and in recent times, the amounts of consumption have been raised greatly, which includes variety of species. The genus Pleurotus comprise about 40 different species that are commonly referred to as “Oyster mushroom”. Among several species of this genus, Pleurotus ostreatus (P. ostreatus) is popularly consumed by all over the world due to their taste, flavor, high nutritional values and medicinal properties. Because of the presence of numerous nutritional compositions and various active ingredients in P. ostreatus, have been reported to have antidiabetic, antibacterial, anticholestrolic, antiarthritic, antioxidant, anticancer, eye health and antiviral activities. In this review, we particularly expose the high nutritional values of P. ostreatus, in relation to their potential medicinal usage which suggest that the P. ostreatus mushrooms are the most important nutraceutical functional foods.

101 citations

Journal ArticleDOI
TL;DR: The mechanism of action of mushroom polysaccharides is to stimulate T-cells, Bcells, natural killer cells, and macrophage dependent immune responses via binding to receptors like the toll-like receptor-2, dectin-1 as mentioned in this paper.

76 citations