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Binding of nontarget microorganisms from food washes to anti-Salmonella and anti-E. coli O157 immunomagnetic beads: most probable composition of background Eubacteria

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Abstract

We present herein the composition of bacterial communities occurring in ground chicken and the changes which arise in these populations based upon nonselective partitioning by commercially-available Dynal anti-Salmonella and anti-E. coli O157 immunomagnetic beads (IMB). Our enumeration and colony selection protocol was based upon a 6 × 6 drop plate method (n = 18 for each 25-g sub-sampling) using a dilution which resulted in ca. 4–8 colonies per drop. An average of 82 ± 13 colonies were selected from three 25-g ground chicken subsamplings per batch, each of which was repeated seasonally for one year. DNA was extracted from each colony and the composition of Eubacteria in each of these harvests was determined by sequence-based identification of 16S rDNA amplicons. The Gram-positive bacteria Brochothrix thermosphacta and Carnobacterium maltaromticum were the most commonly found organisms in both the total chicken wash (PBS) and in the IMB-bound (PBS-washed) fractions. The remaining background organisms which also adhered to varying degrees to commercial IMBs were: Pseudomonas oleovorans, Acinetobacter lwoffi, Serratia spp., and one Rahnella spp. A large number of the organisms were also cladistically evaluated based on rDNA basepair disparities: all Brochothrices were monophyletic; twelve different Pseudomonads were found along with eight Carnobacteria, seven Acinetobacteres, four Serratiae, and two Rahnellae. Carnobacterium alone showed an IMB-based concentration enhancement (ca. two to sixfold).

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Authors and Affiliations

  1. United States Department of Agriculture, Microbial Biophysics and Residue Chemistry, Eastern Regional Research Center, 600 E. Mermaid Lane, Wynmoor, PA, 19038, USA

    Peter Irwin, Ly-Huong Nguyen & George Paoli

  2. United States Department of Agriculture, Microbial Food Safety, Eastern Regional Research Center, 600 E. Mermaid Lane, Wynmoor, PA, 19038, USA

    Chin-Yi Chen

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  1. Peter Irwin
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  2. Ly-Huong Nguyen
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  3. Chin-Yi Chen
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  4. George Paoli
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Correspondence to Peter Irwin.

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Any reference to a brand or firm name does not constitute endorsement of the US Department of Agriculture over others of a similar nature not mentioned

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Irwin, P., Nguyen, LH., Chen, CY. et al. Binding of nontarget microorganisms from food washes to anti-Salmonella and anti-E. coli O157 immunomagnetic beads: most probable composition of background Eubacteria. Anal Bioanal Chem 391, 525–536 (2008). https://doi.org/10.1007/s00216-008-1959-2

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  • DOI: https://doi.org/10.1007/s00216-008-1959-2

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