Food Protection Trends - November 2008 - 829

identifying possible interactions between multiple antimicrobials. Mohammad Obaidat’s presentation addressed the use of volatile antimicrobials in the vapor state such as allyl isothiocyantate, carvacrol and cinnamic aldehyde against pathogens on tomatoes at three storage temperatures of 4, 10 and 25°C. His research showed that the control of pathogens on fresh tomatoes marketed in packages containing head space under controlled temperature storage has great promise. Dr. Joshua Gurtler then addressed the audience presenting his study on the effects of nisin on the survival of Yersinia in whole liquid egg stored at refrigerated and abused temperatures showing that nisin at a level of 500 IU/ml had no bearing on the growth or survival of Yersinia in WLE stored at 5, 10 or 21°C for up to 72 hours. The session was concluded by Kirsten Hirneisen who assessed the baro-protective effects of food components (fats and proteins) on viral inactivation using a seafood salad as a model system for her study. Her results indicated that pressure inactivation of Hepatitis A, Norovirus and Feline calicivirus were impacted by the fat and protein content of the salad. t3 – toxicology, Seafood and Meat and Poultry technical Session Hudaa Neetoo, University of Delaware and Laura J. Bauermeister, Auburn University Dr. Lindsay Arthur opened the session by outlining the dangers of human exposure to cadmium. The objectives of her research were to identify the soil characteristics known to affect the Cadmium (Cd) accumulation in different soybean cultivars. Her findings demonstrated that soil pH played a considerable role in Cd accumulation James Sasanya evaluated the use of a New LC-UV/MS method to analyze parent mycotoxin zearalenone, mycotoxin analogues and its conjugates in wheat samples pointing out that the novel method has the capability to detect mycotoxin conjugates in wheat at levels about the legal limit Masashi Ando demonstrated that the mercury concentration in cultured bluefish tuna could be reduced through raising fish on horse mackerel and sand lace; thus suggesting the feasibility of an important breeding method to address the issue of mercury toxicity in fish. Kristin Bjornsdottir presented her research on the development and validation of a screening method for the detection of histamine-producing bacteria. Her results showed that novel methods such as PCR could be more reliable and convenient for a timely detection of histamine-producing bacteria. George Flick evaluated the effect of two alternative cooling conditions on mortality and microbial safety/quality of clams and observed statistically lower aerobic plate counts when clams were stored under the alternative cooling conditions suggesting therefore that the clam industry should probably reconsider their currently recommended cooling practice. Stephanie Drake evaluated the impact of on-deck storage of the safety of commercially harvested oysters with respect to oysterborne pathogens Vibrio vulnificus and Vibrio parahaemolyticus and showed that current harvesting practices can have a bearing on the levels and strains of these pathogens. She stressed the importance of using data garnered in her studies for risk assessment studies and for shaping future policies. Tagelsir Mohamed used molecular methods to look for class-I integron and BlaCMY antibiotic resistance genes in Salmonella and also determined the genetic diversity in populations of S. Typhimurium and S. Kentucky isolated from a poultry facility. Alejandro Echeverry evaluated use of lactic acid bacteria, acidified sodium chlorite and lactic acid in marinated beef products as control measures for Salmonella Typhimurium DT104 and Escherichia coli O157:H7. Nigel Harper validated the thermal processing techniques used in chopped and formed beef jerky to control pathogens. Specifically, Salmonella spp. were reduced by 5 logs under normal processing conditions, however, Escherichia coli O157:H7 needed an additional 1.5 hours of drying at 68oC to achieve a 5 log reduction. Kristina Barlow presented information on Listeria monocytogenes collected by FSIS testing programs in ready-to-eat meat products from 1994 to 2006. Mark Berrang presented on the use of online brush and spray washers used tin a poultry processing facility and their ability to reduce Campylobacter, Escherichia coli and Salmonella. Richard Gast wrapped up this session with a study on Salmonella Enteritidis and how it multiplies in the egg yolk membrane and penetrates into the egg yolk contents. This information offers more evidence in the importance of rapid refrigeration to keep the bacteria from multiplying and keeping the consumer safe. t4 – risk Assessment and Produce technical Session Saurabh Kumar, University of Nebraska – Lincoln and Olasunmbo Ajayi, Alabama A&M University Eelco Franz presented on “A Chain Modeling Approach to Estimate the Impact of Soil Cadmium Pollution on Human Dietary Exposure.” He indicated that there is a direct or indirect transfer of heavy metal into dietary through soil, using three models of heavy metal uptakes: soil, cattle and human exposure. 829 NOVEMBER 2008 | FOOD PROTECTION TRENDS

Food Protection Trends - November 2008

Table of Contents for the Digital Edition of Food Protection Trends - November 2008