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ROBERT F. ROBERTS

Associate Professor of Food Science

428 Food Science Building
University Park, PA 16802

Ph: (814) 863-2959
Lab: (814) 865-8377
FAX: (814) 863 6132
Email: BobRoberts@psu.edu		 Video
 
Education | Research Interests | Extension Programs | Selected Publications | Informational Web Site

Education:
 

University of Minnesota, Ph.D., Food Science, May 1991
South Dakota State University, M.S., Dairy Science, August 1986
University of Vermont, B.S. Animal Science, May 1984

 
Research Interests:
 My research program at Penn State focus on problems related to dairy products processing.  Current research projects include studying the production of exopolysaccharides by Lactobacillus delbrueckii subsp. bulgaricus, the potential of colicins as biopreservatives in fermented dairy and nondairy foods, and developing an understanding of the effects of various processing parameters on the structure and sensory attributes of ice cream.

I am a member of both the Microbial Food Safety and Ingredients as Materials impact groups.
 
Extension Programs
 Dairy Foods Manufacturing
Ice Cream Shortcourse
Successful Ice Cream Retailing
Cultured Products Shortcourse
Pasteurizer Operators Shortcourse
 
Selected Publications:
 Murinda, S. E., Shu-Min Liu, R. F. Roberts and R. A. Wilson. Colicinogeny Among Escherichia coli Serotypes, Including O157:H7, Representing Four Closely-Related Diarrheagenic Clones. Journal of Food Protection

Kimmel, S. A. and R. F. Roberts. Development of a medium suitable for exopolysaccharide production by Lactobacillus delbrueckii ssp. bulgaricus RR. International Journal of Food Microbiology.

Swarts, A. J., J. W. Hastings, R. F. Roberts and A. von Holy. Flow cytometry demonstrates bacteriocin-induced injury to Listeria monocytogenes. Current Microbiology.

Kimmel, S. A., R. F. Roberts, and G. R. Ziegler. (1998). Optimization of exopolysaccharide production by Lactobacillus delbrueckii ssp. bulgaricus RR grown in a semi-defined medium. Applied and Environmental Microbiology. 64:659-664

Hess, S. J., R. F. Roberts and G. R. Ziegler. 1997. Rheological properties of nonfat yogurt stabilized using strains of Lactobacillus delbrueckii ssp. bulgaricus producing exopolysaccharide or commercial stabilizer systems. Journal of Dairy Science. 80:252-263

Murinda, S. E., R. F. Roberts and R. A. Wilson. 1996 . Evaluation of colicins for inhibitory activity against diarrheagenic Escherichia coli strains including serotype O157:H7. Applied and Environmental Microbiology. 62:3196-3202

Roberts, R. F. and J. A. Maust. 1995. Composition and microbiological quality of refrigerated non-fat and low-fat yogurts available at retail outlets. Cultured Dairy Products Journal 30(4):2-6

Murinda, S. E., R. F. Roberts and S. Doores. 1995. Evaluation of lactic acid producing Bacillus strains and Sporolactobacillus for production of inhibitors against Listeria monocytogenes. Journal of Food Protection. 58:570-573

E. A. Zottola, T. Yezzi, D. Ajao and R. F. Roberts. 1994. Utilization of Cheddar cheese containing nisin as an antimicrobial agent in other foods. International Journal of Food Microbiology. 24:227-232

Roberts, R. F. and E. A. Zottola. 1993. Shelf life of pasteurized process cheese spreads made from Cheddar cheese manufactured with a nisin-producing starter culture. Journal of Dairy Science. 76:1829-1836

Roberts, R. F. , E. A. Zottola and L. L. McKay. 1992. Use of a nisin-producing starter culture suitable for Cheddar cheese manufacture. Journal of Dairy Science. 75:2353-2363

Eckner, K. F., Roberts, R. F., Strantz, A. A. and E. A. Zottola. 1989. Characterization and behavior of Salmonella javiana during Mozzarella manufacture. Journal of Food Protection. 53:461-464

Roberts, R. F. and G. S. Torrey. 1986. Inhibition of psychrotrophic bacterial growth in refrigerated milk by addition of carbon dioxide. Journal of Dairy Science. 71:52-60

For more information contact:

Juanita Wolfe, Graduate and Undergraduate Program Contact
203 Food Science Building
University Park, PA 16802
Ph: (814) 863 8667
Email:jmw5@psu.edu
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Last Update was April 14, 2008
College ofAgricultural Sciences