School Of Environment And Earth Sciences

Permanent URI for this communityhttps://kr.cup.edu.in/handle/32116/83

Browse

Filters

2015 - 20202

Settings

Subject: search.filters.subject.Antioxidants

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Geochemical relationship and translocation mechanism of arsenic in rice plants: A case study from health prone south west Punjab, India
    (Elsevier B.V., 2020) Sharma S.; Kumar R.; Sahoo P.K.; Mittal S.
    Rice is a recognised hyperaccumulator of arsenic (As) and is a serious concern for rice varieties grown in As contaminated soil-water systems. In this regard, groundwater, soil and rice-plant samples (two varieties: PR122 and PUSA1121) collected from 10 sites of district Bathinda were studied for their physicochemical characteristics and As concentration. In vitro studies were carried out to study the role of antioxidant enzymes in As uptake and translocation mechanism. The results showed that the As concentration in water and soil samples ranged from 54 to 132 ?g/L and 6.62–19.56 mg/kg, respectively. The As in rice roots, straw, husk and grains of PR122 ranged from 1.89 to 8.56, 0.20–5.3, 0.12–1.42, 0–0.12 mg/kg, respectively and 1.24–8.16, 0.54–5.11, 0.11–1.06 mg/kg and below detection limit (BDL), respectively for PUSA1121. Although a moderate correlation (r = 0.37) was observed between As in groundwater and soil, the higher As concentration found in both media in Behman and Teona areas indicates that we cannot ignore the role of groundwater in As contamination. Spearman correlation analysis indicates the positive impact of As from groundwater and soil in aerial parts of both rice varieties except grains. In vitro studies showed an increase in antioxidant enzyme activities with the increase in As toxicity (15–60 ?M), which indicates As tolerant behaviour in both rice varieties. The hazard quotient (HQ) for both rice varieties is < 1, which suggest no potential non-cancer health risk, however the cancer risk (CR) for PR122 variety exceeded (2.06 – 10?4) the acceptable limit of 1 × 10?4 (USEPA). Based on the present study, it can be concluded that both the rice varieties are tolerant to As and their grains are safe for human consumption.
  • No Thumbnail Available
    Item
    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.