D O Ukuku

Summary

Affiliation: Agricultural Research Service
Country: USA

Publications

  1. doi request reprint Effect of storage temperature on survival and recovery of thermal and extrusion injured Escherichia coli K-12 in whey protein concentrate and corn meal
    Dike O Ukuku
    Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Wyndmoor, PA 19038, USA
    Foodborne Pathog Dis 10:62-8. 2013
  2. doi request reprint Effect of native microflora, waiting period, and storage temperature on Listeria monocytogenes serovars transferred from cantaloupe rind to fresh-cut pieces during preparation
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA 19038, USA
    J Food Prot 75:1912-9. 2012
  3. ncbi request reprint Membrane damage and viability loss of Escherichia coli K-12 and Salmonella enteritidis in liquid egg by thermal death time disk treatment
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 71:1988-95. 2008
  4. doi request reprint Growth parameters of Escherichia coli O157:H7, Salmonella spp., Listeria monocytogenes, and aerobic mesophilic bacteria of apple cider amended with nisin-EDTA
    Dike O Ukuku
    Eastern Regional Research Center, U S Department of Agriculture, Agricultural Research Service, Wyndmoor, Pennsylvania 19038, USA
    Foodborne Pathog Dis 6:487-94. 2009
  5. ncbi request reprint Leakage of intracellular UV materials of high hydrostatic pressure-injured Escherichia coli O157:H7 strains in tomato juice
    D O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 72:2407-12. 2009
  6. doi request reprint A combined treatment of UV-light and radio frequency electric field for the inactivation of Escherichia coli K-12 in apple juice
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, US Department of Agriculture 1, Wyndmoor, Pennsylvania 19038, USA
    Int J Food Microbiol 138:50-5. 2010
  7. doi request reprint Hydrophobic and electrostatic interaction chromatography for estimating changes in cell surface charge of Escherichia coli cells treated with pulsed electric fields
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA
    Foodborne Pathog Dis 8:1103-9. 2011
  8. ncbi request reprint Membrane damage and viability loss of Escherichia coli K-12 in apple juice treated with radio frequency electric field
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 71:684-90. 2008
  9. ncbi request reprint Behavior of Listeria monocytogenes inoculated on cantaloupe surfaces and efficacy of washing treatments to reduce transfer from rind to fresh-cut pieces
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 65:924-30. 2002
  10. ncbi request reprint Relationship of cell surface charge and hydrophobicity to strength of attachment of bacteria to cantaloupe rind
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 65:1093-9. 2002

Detail Information

Publications22

  1. doi request reprint Effect of storage temperature on survival and recovery of thermal and extrusion injured Escherichia coli K-12 in whey protein concentrate and corn meal
    Dike O Ukuku
    Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Wyndmoor, PA 19038, USA
    Foodborne Pathog Dis 10:62-8. 2013
    ....
  2. doi request reprint Effect of native microflora, waiting period, and storage temperature on Listeria monocytogenes serovars transferred from cantaloupe rind to fresh-cut pieces during preparation
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA 19038, USA
    J Food Prot 75:1912-9. 2012
    ..monocytogenes. The results of this study confirmed the need to store fresh-cut cantaloupes at 5°C immediately after preparation to enhance the microbial safety of the fruit...
  3. ncbi request reprint Membrane damage and viability loss of Escherichia coli K-12 and Salmonella enteritidis in liquid egg by thermal death time disk treatment
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 71:1988-95. 2008
    ..39 in the treated samples. These results indicate similar thermal injury/damage on both E. coli and Salmonella membranes as determined by the amount of inactivation, viability loss, and leakage of intracellular substances of bacteria...
  4. doi request reprint Growth parameters of Escherichia coli O157:H7, Salmonella spp., Listeria monocytogenes, and aerobic mesophilic bacteria of apple cider amended with nisin-EDTA
    Dike O Ukuku
    Eastern Regional Research Center, U S Department of Agriculture, Agricultural Research Service, Wyndmoor, Pennsylvania 19038, USA
    Foodborne Pathog Dis 6:487-94. 2009
    ....
  5. ncbi request reprint Leakage of intracellular UV materials of high hydrostatic pressure-injured Escherichia coli O157:H7 strains in tomato juice
    D O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 72:2407-12. 2009
    ..However, injured and healthy populations for both strains were below detection in tomato juice stored at 5 degrees C for 1,440 min...
  6. doi request reprint A combined treatment of UV-light and radio frequency electric field for the inactivation of Escherichia coli K-12 in apple juice
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, US Department of Agriculture 1, Wyndmoor, Pennsylvania 19038, USA
    Int J Food Microbiol 138:50-5. 2010
    ..Also, the effect of the two processing treatment combination on bacterial inactivation was not additive...
  7. doi request reprint Hydrophobic and electrostatic interaction chromatography for estimating changes in cell surface charge of Escherichia coli cells treated with pulsed electric fields
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA
    Foodborne Pathog Dis 8:1103-9. 2011
    ..coli bacteria as evidenced by the changes in surface hydrophobicity and cell surface charge leading to injury and subsequent inactivation of the cells...
  8. ncbi request reprint Membrane damage and viability loss of Escherichia coli K-12 in apple juice treated with radio frequency electric field
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 71:684-90. 2008
    ..The results of this study suggest that mechanism of inactivation of RFEF is by disruption of the bacterial surface structure leading to the damage and leakage of intracellular biological active compounds...
  9. ncbi request reprint Behavior of Listeria monocytogenes inoculated on cantaloupe surfaces and efficacy of washing treatments to reduce transfer from rind to fresh-cut pieces
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 65:924-30. 2002
    ..It is concluded that sanitizing with chlorine or hydrogen peroxide has the potential to reduce or eliminate the transfer of L. monocytogenes on melon surfaces to fresh-cut pieces during cutting...
  10. ncbi request reprint Relationship of cell surface charge and hydrophobicity to strength of attachment of bacteria to cantaloupe rind
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 65:1093-9. 2002
    ..There was a linear correlation between bacterial cell surface hydrophobicity (r2 = 0.767), negative charge (r2 = 0.738), and positive charge (r2 = 0.724) and the strength of bacterial attachment to cantaloupe surfaces...
  11. ncbi request reprint Method of applying sanitizers and sample preparation affects recovery of native microflora and Salmonella on whole cantaloupe surfaces
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 67:999-1004. 2004
    ..8 log unit) by blending compared to homogenization in a stomacher. In most instances, selective media used did not differ significantly (P > 0.05) for recovery of Salmonella after washing treatments...
  12. ncbi request reprint Effect of hot water and hydrogen peroxide treatments on survival of salmonella and microbial quality of whole and fresh-cut cantaloupe
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 67:432-7. 2004
    ..The results of this study indicate that the use of hot water (97 degrees C) or heated hydrogen peroxide to reduce the population of Salmonella on contaminated whole cantaloupes will enhance the microbial safety of the fresh-cut product...
  13. ncbi request reprint Effect of hydrogen peroxide treatment on microbial quality and appearance of whole and fresh-cut melons contaminated with Salmonella spp
    Dike O Ukuku
    Food Safety Intervention Technologies, Eastern Regional Research Center, U S Department of Agriculture, Agricultural Research Service, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA
    Int J Food Microbiol 95:137-46. 2004
    ....
  14. ncbi request reprint Bioluminescence ATP assay for estimating total plate counts of surface microflora of whole cantaloupe and determining efficacy of washing treatments
    D O Ukuku
    US Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 64:813-9. 2001
    ..The assay can save the industry time by eliminating the required incubation required by the conventional methods...
  15. ncbi request reprint Effect of sanitizer treatments on Salmonella Stanley attached to the surface of cantaloupe and cell transfer to fresh-cut tissues during cutting practices
    D O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 64:1286-91. 2001
    ..Salmonella outgrowth occurred on inoculated fresh-cut cubes stored above 4 degrees C...
  16. ncbi request reprint Effect of time before storage and storage temperature on survival of Salmonella inoculated on fresh-cut melons
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, US Department of Agriculture, Agriculture Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    Food Microbiol 24:288-95. 2007
    ....
  17. ncbi request reprint Effect of sanitizing treatments on removal of bacteria from cantaloupe surface, and re-contamination with Salmonella
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, US Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    Food Microbiol 23:289-93. 2006
    ..The results of this study clearly show that sanitized cantaloupes are susceptible to recontamination if exposed to a human bacterial pathogen during subsequent handling...
  18. ncbi request reprint Effect of vacuum-steam-vacuum treatment on microbial quality of whole and fresh-cut cantaloupe
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 69:1623-9. 2006
    ..on whole cantaloupes will reduce subsequent transfer of these microbes to fresh-cut pieces and enhance the microbial quality of the fresh-cut product...
  19. ncbi request reprint ATP bioluminescence assay for estimation of microbial populations of fresh-cut melon
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 68:2427-32. 2005
    ....
  20. ncbi request reprint Use of hydrogen peroxide in combination with nisin, sodium lactate and citric acid for reducing transfer of bacterial pathogens from whole melon surfaces to fresh-cut pieces
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    Int J Food Microbiol 104:225-33. 2005
    ..The results suggest that HPLNC could be used to decontaminate whole melon surfaces and so improve the microbial safety and quality of fresh-cut melons...
  21. ncbi request reprint Effect of nisin in combination with EDTA, sodium lactate, and potassium sorbate for reducing Salmonella on whole and fresh-cut cantaloupet
    Dike O Ukuku
    Food Safety Intervention Technologies Research Unit, U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 67:2143-50. 2004
    ....
  22. ncbi request reprint Effects of cell surface charge and hydrophobicity on attachment of 16 Salmonella serovars to cantaloupe rind and decontamination with sanitizers
    Dike O Ukuku
    U S Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, USA
    J Food Prot 69:1835-43. 2006
    ....