Antioxidant properties of some leafy and non leafy vegetables in west africa

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Antioxidant properties of some leafy and non leafy vegetables in west africa

  1. 1. SEMINAR PRESENTATION ON ANTIOXIDANT PROPERTIES OF LEAFY AND NON-LEAFY VEGETABLES BY AKINWEMOYE, AKINBOBOLA SOLOMON JUNE, 2013
  2. 2.  Oxidation, which is essential for the production of energy to fuel biological process usually produces free radicals and other reactive oxygen species that can damage tissues and causes cell death. (Simic et al., 1992).  Many plants including fruits and vegetables are recognized as sources of natural antioxidants that can protect against oxidative stress and thus play an important role in the chemoprevention of diseases that have their aetiology and pathophysiology in reactive oxygen species (Odukoya et al., 2001). INTRODUCTION
  3. 3. Free radicals & Reactive oxygen species
  4. 4. VEGETABLESVEGETABLES Vegetables are a large class of plants. They give variety of flavours and colour to feed and food and they include leaves, stems, seeds and flowers (Tindall, 1983) Click here to get more info about animal
  5. 5. CLASSIFICATION OF VEGETABLES Non-leafy Vegetables Leafy Vegetables
  6. 6.  Antioxidants are substances that are capable of counteracting the damaging, but normal effects of the physiological process of oxidation in animal tissues (Gey, 1998).  When a free radical gains the electron from an antioxidant; it is no longer capable of attacking the cell and the chain reaction of oxidation is broken (Dekkers et al., 1996). ANTIOXIDANTS
  7. 7. Some antioxidants are: VITAMIN EVITAMIN E VITAMIN CVITAMIN C β-CAROTENEβ-CAROTENE SELENIUMSELENIUM ANTIOXIDANTSANTIOXIDANTS
  8. 8. MODE OF ACTION OF ANTIOXIDANTS  PREVENTIVE ANTIOXIDANTS  RADICAL SCAVENGING ANTIOXIDANTS  REPAIR AND de novo ANTIOXIDANTS  ADAPTATION
  9. 9. Antioxidant Properties ofAntioxidant Properties of Vernonia amygdalinaVernonia amygdalina (Bitter leaf)(Bitter leaf)  Bitter leaf plant contains natural antioxidants against aqueous radicals and reactive species ions (Erasto et al., 2007).  Vernonia amygdalina leaf is a vegetable with several potentials in the prevention and treatment of various ailments associated with oxidative stress.
  10. 10. Plate 1:Vernonia amygdalina (Bitter leaf)
  11. 11. Antioxidant Properties of Telfairia occidentalis (Fluted pumpkin)  The herbal preparation of the plant has been employed in the treatment of sudden attack of convulsion, gastrointestinal disorders, malaria and anaemia.  The consumption of leaves of Telfairia occidentalis will provide adequate antioxidants capable of preventing diseases arising from oxidative stress thus promoting the general wellbeing of an individual.
  12. 12. Plate 2: Telfairia occidentalis (Fluted pumpkin)
  13. 13. Antioxidant Properties of Ocimum (Basil)Antioxidant Properties of Ocimum (Basil)  Ocimum basilicum (basil) has been used as a medicinal plant for various ailments, such as headaches, coughs, diarrhoea, constipation, warts, worms and kidney malfunction  The methanolic extract of leaf of O. gratissimum was also shown to be capable of scavenging the free radicals DPPH radical, superoxide anion radical, hydroxyl radical, nitric oxide radicals, as well as inhibiting lipid peroxidation, using appropriate assay systems compared to natural and synthetic antioxidants.
  14. 14. Plate 3: Ocimum (Basil)
  15. 15. Antioxidant Properties ofAntioxidant Properties of Adansonia digitataAdansonia digitata (Baobab)(Baobab)  The leaves are used to treat insect bites, guinea worm and internal pains, dysentery, diseases of the urinary tract, opthalmia and otitis (Sidibe et al., 2002).  Certain bioactive compounds in baobab leaves, may be responsible for the treatment of certain ailments, as well as containing properties that can be beneficial to overall health.
  16. 16. Plate 4: Adansonia digitata (Baobab)
  17. 17. Antioxidant Properties of Corchorus olitorius (Jute Mallow)  Its leaves also act as blood purifier and the leaf twigs is used against heart troubles while cold leaf infusion is taken to restore appetite and strength, leaves used for ascites, pains, piles, tumours, gonorrhoea and fever (Fasinmirin and Olufayo, 2009).  The synergistic antioxidant activities of the hydrophilic and lipophilic constituents may contribute to the medicinal properties of C. olitorius leaf.
  18. 18. Plate 5: Corchorus olitorius (Jute Mallow)
  19. 19. Antioxidant Properties of Mushrooms  Bahl (1983) showed mushrooms cure epilepsy, wounds, skin diseases, heart ailments, rheumatoid arthritis, cholera besides intermittent fevers, diaphoretic, diarrhoea, dysentery, cold, anaesthesia, liver disease, gall bladder diseases and used as vermicides.  Fruiting bodies of medicinal mushroom (G. lucidum) contain polysaccharides, triterpenoids, adenosine, germanium, protein (L2-8), amino acids which have been found to have antitumor and immuno-modulating effect (Sing et al., 2008).
  20. 20. Plate 6: Mushrooms
  21. 21. Antioxidant Properties of Peppers (Capsicum species)  Peppers have been reported to contain an anticoagulant that helps prevent the blood clots that can cause heart attacks (Andrews, 1995)  Different varieties of the genus Capsicum are widely grown for their fruits, which may be eaten fresh, cooked, as a dried powder, in a sauce, or processed into oleoresin (Poulos, 1993).
  22. 22. Plate 7: Peppers
  23. 23. Antioxidant Properties of Eggplants (Solanum melongena)  Eggplant and pea sprout extracts contained high phenolic compounds, anthocyanins, and ascorbic acids which appeared to be responsible for their antioxidant activities and scavenging effects (Bor et al., 2006). Click here to get more info about animal
  24. 24. Plate 8: Eggplants (Solanum melongena)
  25. 25. Antioxidant Properties of Carrots (Daucus carota)  Carrot was found to exert antioxidant activity though it is not very strong compared to other vegetables.  Carrot ingestion was found to decrease lipemia and improve the antioxidant status
  26. 26. Plate 9: Carrots
  27. 27. Conclusion These vegetables are useful for the general wellbeing of man and livestock. They help in improving the body functions and preventing of diseases associated with oxidative stress in the body cells. Since vegetables are cheap to obtain and they are sufficiently available, their consumption will reduce dependency on the use of synthetic antioxidants by human and livestock.
  28. 28. Recommendations  A substantial quantity of vegetables should be consumed because of their importance to the body.  Fruits, vegetables and berries are to be planted in gardens at home backyards  Animals should be fed greens so that they will have access to ready vitamins and other nutritionally needed nutrients. Click here to get more info about animal

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