Browsing by Author "Walallawita Kankanamge U"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Comparison of Oxidative Stability of Sesame (Sesamum Indicum), Soybean (Glycine Max) and Mahua (Mee) (Madhuca Longifolia) Oils Against Photo-Oxidation and Autoxidation
    (Elsevier B.V., 2016-03-30) Walallawita WKUS; Bopitiya D; Sivakanthan S; Jayawardana NWIA; Madhujith T; Walallawita Kankanamge U
    Lipid oxidation is one of the major causes of food spoilage. This study was conducted to evaluate and compare the oxidative stability of sesame (Sesamum indicum), soybean (Glycine max) and mahua (Madhuca longifolia) against photooxidation and autoxidation. Stability of oils against photo-oxidation and autoxidation was determined by exposing the oils to florescent light over 28 days and storing the oils at an elevated temperature (60 °C) for 28 days, respectively. The level of oxidation was determined by measuring peroxide value (PV), thiobarbituric acid reactive substances (TBARS), conjugated dienes (CD) and conjugated trienes (CT). Sesame oil exhibited the strongest oxidative stability against both photo-oxidation and autoxidation while Mahua oil exhibited the least stability highest both photo-oxidation and autoxidation as measured by primary oxidative products. However, Mahua oil showed the strongest stability against both photo-oxidation and autoxidation as measured by secondary oxidative products. In conclusion, higher oxidative stability was shown by the Mahua oil than sesame and soybean oils for photooxidation and autoxidation.
  • Thumbnail Image
    Item
    Small daily doses of orange heirloom (“Moonglow”) tomatoes dose-dependently increase plasma and liver lycopene concentrations in rats
    (Oxford University Press on behalf of Japan Society for Bioscience, Biotechnology, and Agrochemistry, 2025-03-08) Walallawita US; Wolber FM; Ziv-Gal A; Kruger MC; Heyes JA; Walallawita Kankanamge U
    Lycopene in red tomatoes is mainly in the poorly bioavailable all-trans- isomeric form, while “Moonglow,” an orange heirloom tomato, contains more bioavailable cis-lycopene isomers. Consuming around 1.5 kg of red tomatoes daily is needed to achieve effective plasma lycopene levels (>0.45 µmol/L). This study hypothesized that small daily doses of “Moonglow” tomatoes could achieve beneficial lycopene levels in rats. Female Sprague-Dawley rats were supplemented with “Moonglow” tomato powder. In Study 1, rats received lycopene at 0, 0.05, 0.35, or 2.6 mg/kg body weight daily for five days. Plasma and liver lycopene concentrations increased dose-dependently. In Study 2, rats given 0.35 mg/kg daily showed dose- and time-dependent increases in lycopene. Plasma lycopene reached 0.42 µmol/L after 4 days, similar to beneficial human levels. These findings suggest that a reasonable daily intake of “Moonglow” tomatoes can achieve effective plasma lycopene concentrations.