Effect of Gamma Irradiation and Fumigation on the Biological Qualities of Green, Black, and Oolong Teas

  • Kwon, Joong-Ho (Department of Food Science and Technology, Kyungpook National University) ;
  • Kausar, Tusneem (Department of Food Science and Technology, Kyungpook National University) ;
  • Kwon, Yong-Jung (Department of Agricultural Biology, Kyungpook National University) ;
  • Kim, Jung-Ae (Department of Agricultural Biology, Kyungpook National University) ;
  • Huh, Eun-Youp (Department of Agricultural Biology, Kyungpook National University) ;
  • Lee, Kyeong-Yeoll (Department of Agricultural Biology, Kyungpook National University) ;
  • Saeed, Shafqat (College of Agriculture, Bahauddin Zakariya University)
  • Published : 2006.02.28

Abstract

The biological qualities of green, black, and oolong teas were monitored by observing their microbial decontamination and insect disinfestation following gamma irradiation (0-10 kGy) and fumigation (MeBr or $PH_3$) during 6-month storage at room temperature. Plodia interpunctella Hubner was found as an important quarantine pest in teas used. In a comparative study, both treatments were found to be effective in disinfecting the stored samples. An irradiation dose of 5 kGy was sufficient to control all microorganisms related to the quality of teas, while fumigation with methyl bromide and phosphine showed no appreciable decontamination effect on the microorganisms. As a result, irradiation was found an effective alternative to fumigants for the improvement of biological tea qualities during storage.

References

  1. Hara Y. Green Tea, Health Benefits and Applications. Marcel Decker, Inc, New York, NY, USA. pp. 16-21 (2001)
  2. Wei SH, Hattab FN, Mellber JR. Concentration of fluoride and selected other elements in teas. Nutrition. 5: 237-240. (1989)
  3. Hamilton MJMT. Antimicrobial properties of tea (Camellia sinensis L.). Antimicrob. Agents Chemother 39: 2375-2377 (1995) https://doi.org/10.1128/AAC.39.11.2375
  4. Kwon JH, Chung HW, Kwon YJ. Infrastructure of quarantine procedures for promoting the trade of irradiated foods. pp. 209-254. In: Symposium on Irradiation Technology for the Safety of Food and Public Health Industries and Quality Assurance. October 13, Daejon, Korea. The Korean Society of Post harvest Science and Technology, Daegu, Korea (2000)
  5. UNEP. Montreal protocol on substances that deplete the ozone layer. pp. 136-168. Report of the methyl bromide technical options committee, United Nations Environment Programme, Nairobi, Kenya (1995)
  6. International Atomic Energy Agency. International consultative group on food irradiation. Available from: http://www.iaeaorglicgfi. Accessed Apr. 1, 2003
  7. Difco manual. Dehydrated culture media and reagents for microbiology. 10th ed. Difco Laboratories, Detroit, MI, USA. pp. 678-691 (1984)
  8. ESKKSAE. Check list of insects from Korea. The Entomological Society of Korea and Korean Society of Applied Entomology (pp. 744). Kou-Kok Univ. Press. Seoul, Korea. p. 744 (1994)
  9. Shelef LA, Naglik OA, Bogen DW. Sensitivity of some common foodborne bacteria to the spices sage, rosemary and allspice. J. Food Sci. 45: 1042-1044 (1980) https://doi.org/10.1111/j.1365-2621.1980.tb07508.x
  10. Sakanaka S, Okula T, Akachi S, Mabe S, Matsumuto M. Tables of data on the antimicrobial activities of green tea extracts. pp. 51-52. In: Chemistry and Application of Green Tea. Yamamoto T, Juneja LR, Chu DC, Kim M (eds). CRC Press, Boca Raton, FL, USA (1997)
  11. Chou CC, Lin LL, Chung KT. Antimicrobial activity of tea as affected by the degree of fermentation and manufacturing season. Inter. J. Food Microbiol. 48: 125-130 (1999) https://doi.org/10.1016/S0168-1605(99)00034-3
  12. Chen AO, Tsae YS, Chiu WTF. The shelf life of the tea. pp. 779800. In: Shelf life Studies of food and beverages. Gharalambous G (ed). Elsevier Science Publication, New York, NY, USA (1993)
  13. Kausar T. The quality and identification characteristics of irradiated and fumigated tea (Camellia sinensis L.). PhD. thesis, Dept. Food Sci. Tech. Kyungpook National University, Daegu, Korea (2005)
  14. Kwon JH, Balenger JMR, Pare JRJ. Effect of ionizing energy treatment on the quality of ginseng products. Radiat. Phys. Chem. 34: 963-967 (1989)
  15. Kwon JH, Byun MW, Kim KS, Kang IJ. Comparative effects of gamma irradiation and phosphine fumigation on the quality of white ginseng. Radiat. Phys. Chem. 57: 309-313 (2000)
  16. Chun MS, Lee TS, Noh BS. Effect of gamma-irradiation on quality of kochujang during storage. Foods Biotechnol. 1: 117-122 (1992)
  17. Kwon H, Lee J, Kwon JH. Effect of electron-beam irradiation on microbiological and physicochemical qualities of powdered meju and soybean paste. Food Sci. Biotechnol. 10: 95-100 (2001)
  18. LeCato GL. Yield, development, and weight of Cadra cautella (Walker) and Plodia interpunctella (Hubner) on twenty-one diets derived from natural products. J. Stored Prod. Res. 12: 43-47 (1976) https://doi.org/10.1016/0022-474X(76)90021-7
  19. Mbata GN. Suitability of maize varieties for the oviposition and development of Plodia interpunctella (Hubner) (Lepidoptera: Pyralidae). Trop. Pest Manag. 36: 122-127 (1990) https://doi.org/10.1080/09670879009371454
  20. Madrid FJ, Sinha RN. Feeding damage of three stored-products moths (Lepidoptera: Pyralidae) on wheat. J. Econ. Entomol. 75: 1017-1020 (1982) https://doi.org/10.1093/jee/75.6.1017
  21. Na JH, Ryoo MI. The influence of temperature on development of Plodia interpunctella (Lepidoptera: Pyralidae) on dried vegetable commodities. J. Stored Prod. Res. 36: 125-129 (2000) https://doi.org/10.1016/S0022-474X(99)00039-9
  22. Mbata GN. Studies on the susceptibility of groundnut varieties to infestation by Plodia interpunctella (Hubner) (Lepidoptera: Pyralidae). J. Stored Prod. Res. 23: 57-63 (1987) https://doi.org/10.1016/0022-474X(87)90036-1
  23. Cox PD, Bell CH. Biology and ecology of moth pests of stored food. pp. 181-193. In: Ecology and Management of Food-Industry Pests. Gorham JR (ed). FDA Technical Bulletin 4, Association of Official Analytical Chemistry. Arlington, VA, USA (1991)
  24. Johnson JA, Wofford PL, Whitehand LC. Effect of diet and temperature on development rates, survival and reproduction of the Indian meal moth (Lepidoptera: Pyralidae). J. Econ. Entomol. 85: 561-566 (1992) https://doi.org/10.1093/jee/85.2.561
  25. Johnson JA, Wofford PL, Gill RF. Developmental thresholds and degree-day accumulations of Indian meal moth (Lepidoptera: Pyralidae) on dried fruits and nuts. J. Econ. Entomol. 88: 734-742 (1995) https://doi.org/10.1093/jee/88.3.734
  26. Simmons P, Nelson HD. Insects on dried fruits. USDA, Agricultural Handbook 464, Washington, DC, USA (1975)
  27. Kwon JH, Byun MW, Lee, S.J., Chyng, H.W. Biological quality and storage characteristics of gamma-irradiated white ginseng. J. Korean Soc. Food Sci. Nutr. 28: 40-46 (1999)
  28. Ahmad M. Disinfestation of stored grains, pulses, dried fruit and nuts, and other dried foods. pp. 77-112. In: Food-Irradiation-Principles and Applications. Molins R (ed). Wiley Intersciences, New York, NY, USA (2001)
  29. Hallman GJ. Irradiation as a quarantine treatment. pp. 113-l30. In: Food-Irradiation-Principles and Applications. Molins R (ed). Wiley Intersciences, New York, NY, USA (2001)
  30. Lardolt PJ, Chambers DL, Chew V. Alternative to the use of probit mortality as a criterion for quarantine treatment of fruit fly (Diptera: Tephritidae) infested fruit. J. Econ. Entomol. 77: 285-287 (1984) https://doi.org/10.1093/jee/77.2.285
  31. Kwon JH, Kwon YJ, Byun MW, Kim KS. Competitiveness of gamma irradiation with fumigation for chestnuts associated with quarantine and quality security. Radiat. Phys. Chem. 71: 41-44 (2004)
  32. Kwon, J.H. Effects of gamma irradiation and methyl bromide fumigation on the qualities of fresh chestnuts during storage. Food Sci. Biotechnol. 14: 181-184 (2005)