University of Minnesota
Department of Food Science and Nutrition
http://fscn.cfans.umn.edu
Go to the U of M home page

Department of Food Science and Nutrition

Francisco Diez-Gonzalez

FSCN-People-Francisco_Diez Ph.D., Professor
Department of Food Science and Nutrition
258 ABLMS
Phone: (612) 624-9756
Fax: (612) 625-5272
fdiez@umn.edu
Complete publication list

Abbreviated Bio

Dr. Francisco Diez-Gonzalez is a Professor of Food Safety Microbiology in the Department of Food Science and Nutrition at the University of Minnesota. His research program is focused on study and control of food-borne pathogens. He teaches courses on food safety and food microbiology. Dr. Diez earned his B.S. in Food Technology, from the Instituto Tecnológico y de Estudios Superiores de Monterrey in Queretaro, Mexico. He received his M.S. and Ph.D. degrees in Food Science from Cornell University. Before joining the University of Minnesota in 1999, Dr. Diez was a Postdoctoral Research Associate in Microbiology at Cornell University. Dr. Diez has authored more than 70 peer-review articles and 10 book chapters. He serves in the editorial board of Applied and Environmental Microbiology, Journal of Food Protection, Food Analytical Methods, and Food Protection Trends. He has been a panel member of six different USDA’s CSREES or NIFA grant programs.

Research

1) Pre-harvest ecology of foodborne pathogens
2) Safety of fresh fruits and vegetables
3) Safety of organic foods
4) Safety of dairy foods
5) Control of select agents for food defense
6) Salmonella in low water activity foods
7) Food service Hispanic workers education
8) Emerging foodborne pathogens

Collaborations

Within FScN: Ted Labuza on Food Defense projects and with Joellen Feirtag on Development of Organic Sanitizers.

Within the U of M: Jeff Bender, College of Vet. Medicine; Craig Hedberg, School of Public Health; Mike Sadowsky, Soil Water and Climate; Cindy Tong, Horticultural Sciences; Michelle Schermann, Bioproducts and Biosystems Engineering; Alfredo DiCostanzo, Animal Science.

Outside collaborations: Todd Callaway, USDA/ARS; Andrew Brabban and Elizabeth Cutter, Evergreen State University; Kumar Venkitanarayanan.

Resident and Outreach Teaching

Selected Scholarship 

Gadotti, C., L. Nelson, and F. Diez-Gonzalez. 2014. Inhibitory effect of combinations of caprylic acid and nisin on Listeria monocytogenes in queso fresco. 2014 39: http://dx.doi.org/10.1016/j.fm.2013.10.007.

Akhtar, M., S. Viazis, and F. Diez-Gonzalez. 2014. Isolation, identification and characterization of lytic, wide host rang bacteriophages from waste effluents against Salmonella enterica serovars. Food Cont. 38: 67-74.

Lumor, S. E., B. D. Deen, I. Ronningen, K. Smith, N. R. Fredrickson, F. Diez-Gonzalez, T. P. Labuza. 2013. Assessment of the inhibition of ricin toxicity by lactose in milk, J. Food Prot. 76: 2037-39.

Cho, S., F. Diez-Gonzalez, C. P. Fossler, S. J. Wells, C. W. Hedberg, J. B. Kaneene, P. L. Ruegg, L. D. Warnick, and J. B. Bender. 2013, Herd-level risk factors associated with fecal shedding of Shiga toxin-encoding bacteria on dairy farms in Minnesota, USA. Can. Vet. J. 54:693-697.

Pimentel-Filho, N. J., H. C. Mantovani, F. Diez-Gonzalez and M. C. Dantas Vanetti Inhibition of Listeria and Staphylococcus aureus by bovicin HC5 and nisin combination in milk J. Agric. Sci. 8:188:196.

Hystead, E., F. Diez-Gonzalez, and T. C. Schoenfuss. 2013. The effect of sodium reduction with and without potassium chloride on the survival of Listeria monocytogenes in Cheddar cheese. J. Dairy Sci. 96:6172-6185.

Hou, Z., R. C. Fink, M. Sugawara, F. Diez-Gonzalez, and M. J. Sadowsky. 2013. Transcriptional and functional responses of Escherichia coli O157:H7 growing in the lettuce rhizoplane. Food Microbiol. 35:136-142.

Yang, H., J. Feirtag, and F. Diez-Gonzalez. 2013. Sanitizing effectiveness of commercial “active water” technologies on Escherichia coli O157:H7, Salmonella enterica and Listeria monocytogenes. Food Cont. 33: 232-238.

Fink R.C., J. M. Popowski J. E. Anderson, J. L. Dahlberg, S. Kalyanikutty, G. I. Crawford, A. Dicostanzo, R. B. Cox, and F. Diez-Gonzalez. 2013. Impact of management practices and distillers' grains feeding on the prevalence of Escherichia coli O157 in feedlot cattle in Minnesota. Foodborne Pathog Dis. 10:559-65.

Compart, D. M, A. M. Carlson, G. I. Crawford, R. C. Fink, F. Diez-Gonzalez, A. Dicostanzo, and G. C. Shurson. 2013. Presence and biological activity of antibiotics used in fuel ethanol and corn co-product production. J Anim Sci. 91:2395-2404.

Hou, Z, R. C. Fink, C. Radtke, M. J. Sadowsky, and F. Diez-Gonzalez. 2013. Incidence of naturally internalized bacteria in lettuce leaves. Int. J. Food Microbiol. 162:260-265.

He, L, D. B. Deen, A. H. Pagel, F. Diez-Gonzalez, and T. P.Labuza. 2013. Concentration, detection and discrimination of Bacillus anthracis spores in orange juice using aptamer based surface enhanced Raman spectroscopy. Analyst. 138:1657-1659.

Hou, Z., R. C. Fink, E. P. Black, M. Sugawara, Z. Zhang, F. Diez-Gonzalez and M. J. Sadowsky. 2012. Gene expression profiling of Escherichia coli in response to interactions with the lettuce rhizosphere. J. Appl. Microbiol. 113, 1076-1086.

Lumor, S. E., B. D. Deen, I. Ronningen, K. Smith, N. R. Fredrickson, F. Diez-Gonzalez, T. P. Labuza. 2012. Detection and inactivation of saxitoxin in skim milk, J. Food Prot. 75: 1113-1116.

Lumor, S. E., N. R. Fredrickson, I. Ronningen, B. D. Deen, K. Smith, F. Diez-Gonzalez, T. P. Labuza. 2012. Comparison of the presence of Shiga toxin 1 in food matrices as determined by an enzyme-linked immunosorbent assay and a biological activity assay. J. Food Prot. 75: 1036-1042.

Fink, R. C., E. Black, Z. Hou, M. Sugawara, M. J. Sadowsky, and F. Diez-Gonzalez. 2012. Transcriptional responses of Escherichia coli K12 and O157:H7 in association with lettuce leaves. Appl. Environ. Microbiol. 78: 1752-1764.

He, L., B. Deen, T. Rodda, I. Ronningen, T. Blasious, C. L. Haynes, F. Diez-Gonzalez, and T. P. Labuza. 2011. Detection of ricin in milk combined immunomagnetic separation with surface-enhanced Raman spectroscopy. J. Food Sci. 76: N49-53.

He, L., E. Lamont. B. Veeregoda, S. Sreevatsan, C. L. Haynes, F. Diez-Gonzalez, and T. P. Labuza. 2011. Aptamer-based surface-enhanced Raman scattering detection of ricin in liquid foods. Chem. Sci. 2: 1579–1582.

He, L., C. Haynes, F. Diez-Gonzalez, and T. P. Labuza. 2011. Rapid detection of a foreign protein in milk using IMS–SERS. J. Raman. Spec. 42: 1428-1434.

Viazis, S., and F. Diez-Gonzalez. 2011. Enterohemorrhagic Escherichia coli: The 20th. century’s emerging foodborne pathogen. A Review. Adv. Agron. 111: 1-50.

Viazis, S., M. Akhtar, A. Brabban, J. Feirtag, and F. Diez-Gonzalez. 2011. Isolation and host range characterization of lytic bacteriophages against enterohemorrhagic Escherichia coli. J. Appl. Microbiol. 110:1323-1331.

He, L., T. Rodda, C. Haynes, T. Deschaines, T. Strother, F. Diez-Gonzalez, and T. P. Labuza. 2011. Detection of a foreign protein in milk using surface-enhanced Raman spectroscopy coupled with antibody-modified silver dendrites. Anal. Chem. 83: 1510–1513.

Lumor, S. E., A. Hutt, I. Ronnigen, F.Diez-Gonzalez, and T. P. Labuza. 2011. Validation of immunodetection (ELISA) of ricin using a biological activity assay. J. Food Sci. 76: C112-C116.

Lumor, S. E., F.Diez-Gonzalez, and T. P. Labuza. 2011. Detection of warfare agents in liquid foods using brine shrimp lethality assay. J. Food Sci. 76: T16-T19.

Viazis, S., M. Akhtar, J. Feirtag, and F. Diez-Gonzalez. 2011. Reduction of Escherichia coli O157:H7 viability on hard surfaces by treatment with a bacteriophage mixture. Intl. J. Food Microbiol. 145: 37-42.

Viazis, S., M. Akhtar, J. Feirtag, and F. Diez-Gonzalez. 2011. Reduction of Escherichia coli O157:H7 viability on leafy green vegetables by treatment with a bacteriophage mixture and trans-cinnamaldehyde. Food Microbiol. 28: 149-157.

Leishman, O., M. Johnson, T. P. Labuza, and F. Diez-Gonzalez. 2010. Survival of Bacillus anthracis spores in fruit juices and wine. J. Food Prot. 73: 1694–1697.

Leishman, O., T. P. Labuza, and F. Diez-Gonzalez. 2010. Hydrophobic properties and extraction of Bacillus anthracis spores from liquid foods. Food Microbiol. 27: 661-666.

Pal, A., T. P. Labuza, and F. Diez-Gonzalez. 2009. Safety-based shelf life model for frankfurters based on time-to-detect Listeria monocytogenes with initial inoculum below detection limit. J. Food Prot. (in press).

Cho, S., F. Diez-Gonzalez, C. P. Fossler, S. J. Wells, C. W. Hedberg, J. B. Kaneene, P. L. Ruegg, L. D. Warnick, and J. B. Bender. 2009. Cattle-level risk factors associated with STEC on dairy farms in Minnesota. Can. J. Vet. Res. 73: 151-156.

Hilgren. J., K. M. J. Swanson, F. Diez-Gonzalez, and B. Cords. 2009. Susceptibilities of Bacillus subtilis, B. cereus and B. anthracis spores to liquid biocides. J. Food Prot. 72: 360-364.

Hilgren. J., K. M. J. Swanson, F. Diez-Gonzalez, and B. Cords. 2009. Inactivation of Yersinia pseudotuberculosis, as a surrogate for Y. pestis, by liquid biocides in the presence of food residue. J. Food Prot. 72: 392-398.

DiLorenzo, N., C. R. Dahlen, F. Diez-Gonzalez, G. C. Lambs, J. E. Larson, and A. DiCostanzo. 2008. Effects of feeding polyclonal antibody preparations on rumen fermentation patterns, performance and carcass characteristics of feedlot steers. J. Ani. Sci. 86:3023-3032.

Pal, A., T. P. Labuza, and F. Diez-Gonzalez. 2008. Evaluating the growth of Listeria monocytogenes in refrigerated ready-to-eat frankfurters – Influence of strain, temperature, packaging, lactate and diacetate, and background microflora. J. Food Prot. 71:1806-1816.

Pal, A., T. P. Labuza, and F. Diez-Gonzalez. 2008. Shelf life evaluation for ready-to-eat sliced uncured turkey breast and cured ham under probable storage conditions based on Listeria monocytogenes and psychrotroph growth. Int. J. Food Microbiol. 126:49-56.

Xu, S., T. P. Labuza, and F. Diez-Gonzalez. 2008. Inactivation of Bacillus anthracis spores in milk by a combination of biocides and heating at high-temperature short-time (HTST) pasteurization temperatures. Appl. Environ. Microbiol. 74: 3336-3341.

Pal, A., T. P. Labuza, and F. Diez-Gonzalez. 2008. Comparison of primary predictive models to study the growth of Listeria monocytogenes at low-temperatures in liquid cultures and selection of fastest growing ribotypes in meat and turkey. Food Microbiol. 25: 460-470.

Xu, S., T. P. Labuza, and F. Diez-Gonzalez. 2008. Inactivation kinetics of avirulent Bacillus anthracis spores in milk with a combination of heat and hydrogen peroxide. J. Food Prot. 51: 333-338.

Hilgren. J., K. M. J. Swanson, F. Diez-Gonzalez, and B. Cords. 2007. Inactivation of Bacillus anthracis spores by liquid biocides in the presence of food residue. Appl. Environ. Microbiol. 73: 6370-6377.

Mukherjee, A., D. Speh, and F. Diez-Gonzalez. 2007. Association of farm management practices with risk of Escherichia coli contamination in pre-harvest produce grown in Minnesota and Wisconsin. Int. J. Food Microbiol. 120:296-302.

Cho, S., F. Diez-Gonzalez, C. P. Fossler, S. J. Wells, C. W. Hedberg, J. B. Kaneene, P. L. Ruegg, L. D. Warnick, and J. B. Bender. 2007. Antimicrobial susceptibility of shiga-toxin producing Escherichia coli isolated from organic and conventional dairy cattle farms, and county fairs in Minnesota. Food. Path. Dis. 4:178-186.

Diez-Gonzalez, F., D. Belina, T. P. Labuza, and A. Pal. 2007. Modeling the growth of Listeria monocytogenes based on time-to-detect model in culture media and frankfurters. Intl. J. Food Microbiol. 113:277-283.

Diez-Gonzalez, F. 2007. Applications of bacteriocins in livestock. Curr. Issues. Int. Microbiol. 8:15-24.

Cho, S., F. Diez-Gonzalez, C. P. Fossler, S. J. Wells, C. W. Hedberg, J. B. Kaneene, P. L. Ruegg, L. D. Warnick, and J. B. Bender. 2006. Prevalence of shiga toxin-encoding bacteria and shiga toxin-producing Escherichia coli isolates from dairy farms and county fairs. Vet. Microbiol. 118:289-298.

Mukherjee, A., D. Speh, A. T. Jones, K. M.Buesing, L. T. L. Xiong, and F. Diez-Gonzalez. 2006. Longitudinal microbiological survey of fresh produce grown by farmers in the Upper Midwest. J. Food Prot. 69:1928-1936.

DiLorenzo, N., F. Diez-Gonzalez, A. DiCostanzo. 2006. Effects of feeding polyclonal antibody preparations on rumen bacteria populations and pH of steers fed high-grain diets. J. Animal. Sci. 84:2178-2185.

Xu, Sa., T. P. Labuza, and F. Diez-Gonzalez. 2006. Thermal Inactivation of Bacillus anthracis Spores in Milk. Appl. Environ. Microbiol. 72:4479-4483.

Mukherjee, A., S. Cho, J. Scheftel, S. Jawahir, K. Smith, and F. Diez-Gonzalez. 2006. Soil Survival of Escherichia coli O157:H7 Acquired by a child from garden soil recently fertilized with cattle manure. J. Appl. Microbiol. 101:429-436.

Cho, S., J. B. Bender, F. Diez-Gonzalez, C. P. Fossler, C. W. Hedberg, J. B. Kaneene, P. L. Ruegg, L. D. Warnick, and S. J. Wells. 2006. Prevalence and characterization of Escherichia coli O157 isolates from Minnesota dairy farms and county fairs. J. Food Prot. 69:252-259.

Jacobs, J. L., F. Diez-Gonzalez, M. D. Stern, and R. L. Phillips. 2005. Detection of transgenic maize Cry1Ab protein subjected to ruminal digestion. J. Ani. Feed Sci. 14:655-664.

Schamberger, G. P., and F. Diez-Gonzalez. 2005. Assessment of Resistance to Colicinogenic Escherichia coli by E. coli O157:H7 Strains. J. Appl. Microbiol. 98:245-252.

Labuza, T. P., F. Diez-Gonzalez, and D. Belina, 2005. Alternatives to safety-based shelf life dating. Food Prot. Trends 25:53-56.
 

Book Chapters

Donnelly, C. W., and F. Diez-Gonzalez. 2013. Listeria monocytogenes. In: R. G. Labbe, and S. Garcia (eds.), Guide to Foodborne Pathogens, John Wiley and Sons, Inc., New York, NY.

Diez-Gonzalez, F. 2010. Fecal bacteria in foods. In: M. J. Sadwosky (eds.), Fecal Indicator Bacteria, ASM Press, Washington, DC (in press).

Diez-Gonzalez, F., and A. Mukherjee. 2009. Produce Safety in Organic vs. Conventional Crops. In: X. Fan, B. A. Niemira, C. J. Doona, F. E. Feeherry, and R. B. Gravani (eds.), Microbial Safety of Fresh Produce: Challenges, Perspectives and Strategies, IFT Press-Wiley Blackwell, Hoboken, N. J.

Diez-Gonzalez, F., and J. Kuruc. 2009. Molecular mechanisms of microbial survival in foods. In: L-A. Jaykus, H. H. Wang, and L. S. Schlesinger (eds.), Food-Borne Microbes, Shaping the Host Ecosystem, ASM Press, Washington, D. C.

Diez-Gonzalez, F. 2007. Effects of organic, ‘low input’ and conventional livestock husbandry methods on the microbiological safety of ruminant (dairy, beef, sheep) production systems. In: C. Leifert (ed.), Handbook of Organic Food Safety and Quality, Woodhead Publishing Ltd.

Diez-Gonzalez, F. 2006. Microorganismos Indicadores. In: Microbiologia de los Alimentos (M. R. Torres Vitela and A. Castillo Ayala (eds.). Universidad de Guadalajara.

Diez-Gonzalez, F. 2006. Use of bacteriocins in livestock. In: M. Riley and O. Gillor (eds.) Bacteriocins: Current Research and Applications. New Horizons Press.

Diez-Gonzalez, F., and G. P. Schamberger. 2005. Use of probiotics in pre-harvest food safety applications. In: I. Goktepe and V. Juneja (eds.), Probiotics in Food Safety and Human Health, Marcel Dekker.

Diez-Gonzalez, F., 2005. The use of diet to control pathogens in animals. In: J. Sofos (ed.), Raw Material Safety: Meat, Woodhead Publishing Ltd.

Diez-Gonzalez, F., and Y. Karaibrahimoglu. 2005. Rapid analysis techniques in food microbiology. In: S. Otles (ed.), Methods of Analysis of Food Components and Additives, CRC Press.
 

Leadership/Service

Awards

Quick Links