Food Biotechnology in the United States: Science, Regulation, and Issues

This report discusses the science of food biotechnology, and the federal structure by which it is regulated. Because U.S. farmers are adopting this technology at a rapid rate, some observers advocate a more active role for the federal government to ensure that farmers have equal access to this technology. Others believe that federal officials should play a more active role in protecting the environment, funding more research, and participating in international trade negotiations to ensure that trade continues to expand for genetically engineered crops. Trading partners often label food products that have been genetically modified as genetically modified organisms (GMOs). Many of those partners have labeling requirements for GMOs to allow consumers the “right to know” their food content

Comparative evaluation of direct plating and most probable number for enumeration of low levels of Listeria monocytogenes in naturally contaminated ice cream products

AbstractA precise and accurate method for enumeration of low level of Listeria monocytogenes in foods is critical to a variety of studies. In this study, paired comparison of most probable number (MPN) and direct plating enumeration of L. monocytogenes was conducted on a total of 1730 outbreak-associated ice cream samples that were naturally contaminated with low level of L. monocytogenes. MPN was performed on all 1730 samples. Direct plating was performed on all samples using the RAPID'L.mono (RLM) agar (1600 samples) and agar Listeria Ottaviani and Agosti (ALOA; 130 samples). Probabilistic analysis with Bayesian inference model was used to compare paired direct plating and MPN estimates of L. monocytogenes in ice cream samples because assumptions implicit in ordinary least squares (OLS) linear regression analyses were not met for such a comparison. The probabilistic analysis revealed good agreement between the MPN and direct plating estimates, and this agreement showed that the MPN schemes and direct plating schemes using ALOA or RLM evaluated in the present study were suitable for enumerating low levels of L. monocytogenes in these ice cream samples. The statistical analysis further revealed that OLS linear regression analyses of direct plating and MPN data did introduce bias that incorrectly characterized systematic differences between estimates from the two methods

Science Behind the Regulation of Food Safety: Risk Assessment and the Precautionary Principle

Although Congress, the President and agency administrators support the use of science as a basis for food safety regulatory activities, there are controversies about how science can best be used for this purpose. Supporters of science-based regulations regard conclusions from well-designed scientific studies as largely impartial and fair

Food Biotechnology in the United States: Science, Regulation, and Issues

This report provides basic information on the science of food biotechnology. It discusses regulatory policies and issues of concern about the use of biotechnology to modify foods through genetic engineering. It describes the scientific processes used and current products available. It explains how all three major federal agencies - the Food and Drug Administration, the U.S. Department of Agriculture, and the Environmental Protection Agency - regulate these foods

You\u27re okay, ev\u27ry way, yessiree, I can see you\u27re okay! [first line of chorus]

Performance Medium: Piano, Voice and Chord

Identification of medicinal off-flavours generated by Alicyclobacillus species in orange juice using GC-olfactometry and GC-MS

Aims: The objective of this study was to identify compounds responsible for medicinal off-flavours produced by different species and strains of Alicyclobacillus in orange juice using a combination of chromatographic-coupled olfactometric techniques and gas chromatography-mass spectrometry (GC-MS). Methods and Results: Each of five Alicyclobacillus strains was inoculated into separate juice samples and incubated up to 28 days at 45degreesC. Aroma compounds in the juice were analysed by GC-olfactometry (GC-O) and confirmed using GC-MS. GC-O identified three components that were described as medicinal/antiseptic. Microbial populations were enumerated at timed intervals by spiral plating onto Alicyclobacillus agar. Within 28 days incubation, all five strains produced medicinal off-aromas from guaiacol and at least one halogenated phenol. Significance and Impact of the Study: This is the first study to evaluate individual juice aroma components produced by Alicyclobacillus species using olfactometry and to demonstrate that at least three medicinal off-flavour compounds are associated with the growth of alicyclobacilli in orange juice

Yeast Species Associated with Orange Juice: Evaluation of Different Identification Methods

Five different methods were used to identify yeast isolates from a variety of citrus juice sources. A total of 99 strains, including reference strains, were identified using a partial sequence of the 26S rRNA gene, restriction pattern analysis of the internal transcribed spacer region (5.8S-ITS), classical methodology, the RapID Yeast Plus system, and API 20C AUX. Twenty-three different species were identified representing 11 different genera. Distribution of the species was considerably different depending on the type of sample. Fourteen different species were identified from pasteurized single-strength orange juice that had been contaminated after pasteurization (PSOJ), while only six species were isolated from fresh-squeezed, unpasteurized orange juice (FSOJ). Among PSOJ isolates, Candida intermedia and Candida parapsilosis were the predominant species. Hanseniaspora occidentalis and Hanseniaspora uvarum represented up to 73% of total FSOJ isolates. Partial sequence of the 26S rRNA gene yielded the best results in terms of correct identification, followed by classical techniques and 5.8S-ITS analysis. The commercial identification kits RapID Yeast Plus system and API 20C AUX were able to correctly identify only 35 and 13% of the isolates, respectively. Six new 5.8S-ITS profiles were described, corresponding to Clavispora lusitaniae, Geotrichum citri-aurantii, H. occidentalis, H. vineae, Pichia fermentans, and Saccharomycopsis crataegensis. With the addition of these new profiles to the existing database, the use of 5.8S-ITS sequence became the best tool for rapid and accurate identification of yeast isolates from orange juice

Ain\u27t been no lovin\u27 since you been gone [first line of chorus]

Performers: Mickey AlpertPiano, Voice and Chord