Department Of Environmental Science And Technology

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Author: search.filters.author.Atri, N.S.Has files: No

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    Taxonomical establishment and compositional studies of a new cordyceps (ascomycetes) species from the northwest himalayas (India)
    (Begell House Inc., 2016) Sharma, S.K.; Gautam, N.; Atri, N.S.; Dhancholia, S.
    During a frequent survey in the northwest Indian Himalayan region, a new species-Cordyceps macleodganensis-was encountered. This species is described on the basis of its macromorphological features, microscopic details, and internal transcribed spacer sequencing. This species showed only 90% resemblance to Cordyceps gracilis. The chemical composition of the mycelium showed protein (14.95 ? 0.2%) and carbohydrates (59.21 ? 3.8%) as the major nutrients. This species showed appreciable amounts of ?-carotene, lycopene, phenolic compounds, polysaccharides, and flavonoids. Mycelial culture of this species showed higher effectiveness for ferric-reducing antioxidant power, DPPH radical scavenging activity, ferrous ion-chelating activity, and scavenging ability on superoxide anion-derived radicals, calculated by half-maximal effective concentrations. ? 2016 Begell House, Inc.
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    Optimization, composition, and antioxidant activities of exo-and intracellular polysaccharides in submerged culture of cordyceps gracilis (Grev.) durieu & Mont.
    (Hindawi Limited, 2015) Sharma, S.K.; Gautam, N.; Atri, N.S.
    Under present experiments, EPS and IPS production, monosaccharide composition, and antioxidant activities of C. gracilis were studied for the first time under submerged culture conditions. Effect of different factors on polysaccharides production was studied by orthogonal experiments using one-factor-at-a-time method. Incubation of culture in the medium with capacity 200 mL (675.12 ? 5.01 and 385.20 ? 5.01 mg/L), rotation speed 150 rpm (324.62 ? 3.32 and 254.62 ? 4.62 mg/L), 6-day culture incubation time (445.24 ? 1.11, 216.60 ? 1.71 mg/L), pH 6.0 (374.81 ? 2.52 and 219.45 ? 2.59 mg/L), and temperature 23?C (405.24 ? 1.11 and 215.60 ? 1.71 mg/L) produced higher EPS and IPS, respectively. Maximum EPS and IPS production was observed in the medium supplemented with glucose as a carbon source (464.82 ? 2.12 and 264.42 ? 2.62 mg/L) and yeast extract as a nitrogen source (465.21 ? 3.11 and 245.17 ? 3.24 mg/L), respectively. Carbon to nitrogen ratio for maximum EPS and IPS production was observed as 10: 1 (395.29 ? 2.15 and 235.62 ? 1.40 mg/L), respectively. Glucose was found to be the major monosaccharide (62.15 ? 7.33%). Both EPS and IPS of C. gracilis showed significant DPPH radical scavenging activity, ABTS radical scavenging activity, reducing power, and iron chelating activity. ? 2015 Sapan Kumar Sharma et al.
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    Evaluation of mycelial nutrients, bioactive compounds, and antioxidants of five Himalayan entomopathogenic ascomyceteous fungi from India
    (Begell House Inc., 2015) Sharma, S.K.; Gautam, N.; Atri, N.S.
    In this study, using standard methods, mycelial nutrients, bioactive compounds, and antioxidants were analyzed for the first time for five fungal species: Isaria sinclairii (Berk.) Lloyd, I. tenuipes Peck, I. japonica Yasuda, I. farinosa (Holmsk) Fr. and Cordyceps tuberculata (Lebert) Maire. All of these species were low in fat content and rich in protein, fiber, ash, and carbohydrates. Mineral elements (Fe, Mg, Cu, Mn, and Ca) were detected in appreciable amounts. All three types of fatty acids (saturated, monounsaturated, and polyunsaturated) as well as bioactive compounds (ascorbic acid, ?-carotene, lycopene, phenolic compounds, and polysaccharides) were detected for each species. The investigated species showed high ferric-reducing antioxidant power as well as 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity. Although differences were observed in the values of each species, each species showed richness in one or more components. ? 2015 Begell House, Inc.