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  1. Article: Escherichia coli

    Bhullar, Manreet / Perry, Bridget / Monge, Ana / Nabwiire, Lillian / Shaw, Angela

    Foods (Basel, Switzerland)

    2021  Volume 10, Issue 6

    Abstract: A number of foodborne outbreaks have occurred in the past decade, with higher incidences associated with romaine lettuce and strawberries. Contaminated agricultural water has been reported as the source of microbial contamination in most of these ... ...

    Abstract A number of foodborne outbreaks have occurred in the past decade, with higher incidences associated with romaine lettuce and strawberries. Contaminated agricultural water has been reported as the source of microbial contamination in most of these outbreaks. Maintaining the adequate and sanitary quality (0
    Language English
    Publishing date 2021-06-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2704223-6
    ISSN 2304-8158
    ISSN 2304-8158
    DOI 10.3390/foods10061390
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Escherichia coli Survival on Strawberries and Unpacked Romaine Lettuce Washed Using Contaminated Water

    Bhullar, Manreet / Perry, Bridget / Monge, Ana / Nabwiire, Lillian / Shaw, Angela

    Foods. 2021 June 16, v. 10, no. 6

    2021  

    Abstract: A number of foodborne outbreaks have occurred in the past decade, with higher incidences associated with romaine lettuce and strawberries. Contaminated agricultural water has been reported as the source of microbial contamination in most of these ... ...

    Abstract A number of foodborne outbreaks have occurred in the past decade, with higher incidences associated with romaine lettuce and strawberries. Contaminated agricultural water has been reported as the source of microbial contamination in most of these outbreaks. Maintaining the adequate and sanitary quality (0 E. coli/100 mL) of agricultural water can be challenging during post-harvest operations such as washing. The study focused on the attachment of generic E. coli (Rifampicin resistant) onto romaine lettuce and strawberries, mimicking the produce wash step. The produce was washed with contaminated water, air-dried, and stored in display units for 7 days. The produce was sampled randomly each day and analyzed for the surviving E. coli count. The results indicated that E. coli can survive in both lettuce and strawberries over extended periods. A survival population of 2.3 log CFU/cm² (day 8) was observed on lettuce with an initial population of 2.8 log CFU/cm² (day 0). On strawberries, the population reduced from 3.0 (day 0) to 1.7 log CFU/cm² (day 7), with an initial E. coli concentration of approx. 6 log CFU/mL in the wash water. Strawberry leaves had a higher attachment of E. coli than the fruit (p < 0.05). In conclusion, romaine lettuce and strawberries washed with contaminated water can cause an outbreak affecting consumers and public health.
    Keywords Escherichia coli ; air drying ; fruits ; microbial contamination ; public health ; rifampicin ; romaine lettuce ; strawberries ; water pollution
    Language English
    Dates of publication 2021-0616
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2704223-6
    ISSN 2304-8158
    ISSN 2304-8158
    DOI 10.3390/foods10061390
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Shiga Toxin–Producing Escherichia coli in the Long-Term Survival Phase Exhibit Higher Chlorine Tolerance and Less Sublethal Injury Following Chlorine Treatment of Romaine Lettuce

    Bhullar, Manreet Singh / Shaw, Angela / Mendonca, Aubrey / Monge, Ana / Nabwire, Lillian / Thomas-Popo, Emalie

    Foodborne pathogens & disease. 2021 Jan. 20,

    2021  

    Abstract: The extent of chlorine inactivation and sublethal injury of stationary-phase (STAT) and long-term survival-phase (LTS) cells of Shiga toxin–producing Escherichia coli (STEC) in vitro and in a lettuce postharvest wash model was investigated. Four STEC ... ...

    Abstract The extent of chlorine inactivation and sublethal injury of stationary-phase (STAT) and long-term survival-phase (LTS) cells of Shiga toxin–producing Escherichia coli (STEC) in vitro and in a lettuce postharvest wash model was investigated. Four STEC strains were cultured in tryptic soy broth supplemented with 0.6% (w/v) yeast extract (TSBYE; 35°C) for 24 h and 21 d to obtain STAT and LTS cells, respectively. Minimum bactericidal concentration (MBC) and dose–response assays were performed to determine chlorine's antibacterial efficacy against STAT and LTS cells. Chlorine solutions (pH 6.5) and romaine lettuce were each inoculated with STAT and LTS cells to obtain initial populations of ∼7.8 log colony-forming units (CFU)/mL. Survivors in chlorine solutions were determined after 30 s. Inoculated lettuce samples were held at 22°C ± 1°C for 2 h or 20 h and then exposed to chlorine (10–40 ppm) for 60 s. Survivors were enumerated on nonselective and selective agar media following incubation (35°C, 48 h). The MBC for STAT and LTS cells was 0.04 and 0.08 ppm, respectively. Following exposure (30 s) to chlorine at 2.5, 5.0, and 10 ppm, STAT cells were reduced to <1.0 log CFU/mL, whereas LTS survivors were at 5.10 (2.5 ppm), 3.71 (5.0 ppm), and 2.55 (10 ppm) log CFU/mL. At 20 and 40 ppm chlorine, greater log CFU reductions of STAT cells (1.64 and 1.85) were observed compared with LTS cells (0.94 and 0.83) after 2 h of cell contact with lettuce (p < 0.05), but not after 20 h. Sublethal injury in STEC after chlorine (40 ppm) treatment was lower in LTS compared with STAT survivors (p < 0.05). Compared with STAT cells, LTS cells of STEC seem to have higher chlorine tolerance as planktonic cells and as attached cells depending on cell contact time on lettuce. In addition, a higher percentage of LTS cells, compared with STAT cells, survive in a noninjured state after chlorine (40 ppm) treatment of lettuce.
    Keywords Shiga toxin-producing Escherichia coli ; antibacterial properties ; assays ; cells ; chlorine ; dose response ; food pathogens ; inactivation ; minimum inhibitory concentration ; models ; pH ; plankton ; population ; romaine lettuce ; sampling ; selective media ; solutions ; strains ; yeast extract
    Language English
    Dates of publication 2021-0120
    Publishing place Mary Ann Liebert, Inc.
    Document type Article
    Note NAL-light
    ZDB-ID 2148479-X
    ISSN 1556-7125 ; 1535-3141
    ISSN (online) 1556-7125
    ISSN 1535-3141
    DOI 10.1089/fpd.2020.2873
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 7517: Show issues

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  4. Article ; Online: Shiga Toxin-Producing

    Bhullar, Manreet Singh / Shaw, Angela / Mendonca, Aubrey / Monge, Ana / Nabwire, Lillian / Thomas-Popo, Emalie

    Foodborne pathogens and disease

    2021  Volume 18, Issue 4, Page(s) 276–282

    Abstract: The extent of chlorine inactivation and sublethal injury of stationary-phase (STAT) and long-term survival-phase (LTS) cells of Shiga ... ...

    Abstract The extent of chlorine inactivation and sublethal injury of stationary-phase (STAT) and long-term survival-phase (LTS) cells of Shiga toxin
    MeSH term(s) Chlorine/pharmacology ; Disinfectants/pharmacology ; Drug Tolerance ; Food Microbiology ; Lactuca/microbiology ; Shiga-Toxigenic Escherichia coli/drug effects ; Drug Resistance, Bacterial
    Chemical Substances Chlorine (4R7X1O2820) ; Disinfectants
    Language English
    Publishing date 2021-01-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2148479-X
    ISSN 1556-7125 ; 1535-3141
    ISSN (online) 1556-7125
    ISSN 1535-3141
    DOI 10.1089/fpd.2020.2873
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 7517: Show issues

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  5. Article: Novel insights in the production, activity and protective effect of Penicillium expansum antifungal proteins

    Gandía, Mónica / Monge, Ana / Garrigues, Sandra / Orozco, Helena / Giner-Llorca, Moisés / Marcos, Jose F / Manzanares, Paloma

    International journal of biological macromolecules. 2020 Dec. 01, v. 164

    2020  

    Abstract: Antifungal proteins (AFPs) offer a great potential as new biofungicides to control deleterious fungi. The phytopathogenic fungus Penicillium expansum encodes three phylogenetically distinct AFPs, PeAfpA, PeAfpB and PeAfpC. Here, PeAfpA, a potent in vitro ...

    Abstract Antifungal proteins (AFPs) offer a great potential as new biofungicides to control deleterious fungi. The phytopathogenic fungus Penicillium expansum encodes three phylogenetically distinct AFPs, PeAfpA, PeAfpB and PeAfpC. Here, PeAfpA, a potent in vitro self-inhibitory protein, was demonstrated to control the infection caused by P. expansum in Golden apple fruits. We determined the production of the three proteins in different growth media. PeAfpA and PeAfpC were simultaneously produced by P. expansum in three out of the eight media tested as detected by Western blot, whereas PeAfpB was not detected even in those described for class B AFP production. Regardless of the culture medium, the carbon source affected Peafp expression. Notably, the production of PeAfpA was strain-dependent, but analyses of PeafpA regulatory sequences in the three strains studied could not explain differences in protein production. None of the PeAFPs was produced during apple infection, suggesting no relevant role in pathogenesis. PeAfpA together with PeAfpB and also with Penicillium digitatum PdAfpB showed synergistic interaction. The highly active antifungal PeAfpA also showed moderate antibacterial activity. We conclude that there is not a general pattern for Peafp gene expression, protein production or antimicrobial activity and confirm PeAfpA as a promising compound for postharvest conservation.
    Keywords Penicillium digitatum ; Penicillium expansum ; Western blotting ; antibacterial properties ; apples ; biopesticides ; carbon ; culture media ; gene expression ; pathogenesis ; phylogeny ; plant pathogenic fungi ; protective effect ; protein synthesis ; synergism
    Language English
    Dates of publication 2020-1201
    Size p. 3922-3931.
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2020.08.208
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    In stock of ZB MED Cologne/Königswinter

    Zs.B 2374: Show issues Location:
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    ab Jg. 2022: Lesesaal (EG)

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  6. Article: Improving temperature management and retaining quality of fresh-cut leafy greens by retrofitting open refrigerated retail display cases with doors

    Xie, Yurui / Brecht, Jeffrey K / Abrahan, Carolina E / Bornhorst, Ellen R / Luo, Yaguang / Monge, Ana Lorena / Vorst, Keith / Brown, Wyatt

    Elsevier Ltd Journal of food engineering. 2021 Mar., v. 292

    2021  

    Abstract: Open refrigerated display cases in supermarkets are prevalent in the United States despite being prone to temperature fluctuations. We collaborated with a chain retailer in Florida to retrofit existing open vegetable display cases with doors, and ... ...

    Abstract Open refrigerated display cases in supermarkets are prevalent in the United States despite being prone to temperature fluctuations. We collaborated with a chain retailer in Florida to retrofit existing open vegetable display cases with doors, and monitored the display temperature profile over 5 months. Quality evaluations were performed on baby spinach, spring mix, and chopped romaine lettuce after storage under simulated open and closed case conditions. Doors improved spatial and temporal temperature uniformity in whole and fresh-cut vegetable cases. Optimal storage temperature for ready-to-eat produce (≤5 °C) was recorded over 98% of the time after door installation versus 49–88% before retrofitting. An overall temperature decrease in the fresh-cut produce case from 3.62 to 0.66 °C necessitated a thermostat setting adjustment of +1.1 °C to avoid freezing of salad product. Elevated headspace CO₂ concentrations and higher populations of aerobic bacteria (6.6 log CFU g⁻¹), yeasts and molds (4.6 log CFU g⁻¹) were found under open display conditions for one or more salad products tested. Baby spinach leaves from the open case environment were lighter green and more yellowish in color. Electrolyte leakage and ascorbic acid content of the three salad types were similar between the open and closed door displays. Superior overall visual quality and stronger purchase intent were found for baby spinach and spring mix samples from the closed display case. These products had less severe off-odor and discoloration, and crispier texture than those held in the open case. The decreased overall temperature and improved temperature uniformity in closed display cases, along with better produce quality and potential energy savings, may encourage retailers to consider retrofitting open displays with doors or purchasing closed displays.
    Keywords ascorbic acid ; carbon dioxide ; color ; discoloration ; electrolyte leakage ; fresh-cut produce ; headspace analysis ; off odors ; potential energy ; ready-to-eat foods ; refrigeration ; romaine lettuce ; salads ; spinach ; storage temperature ; temperature profiles ; texture ; Florida
    Language English
    Dates of publication 2021-03
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 622518-4
    ISSN 0260-8774
    ISSN 0260-8774
    DOI 10.1016/j.jfoodeng.2020.110271
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 5086: Show issues

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  7. Article ; Online: Novel insights in the production, activity and protective effect of Penicillium expansum antifungal proteins.

    Gandía, Mónica / Monge, Ana / Garrigues, Sandra / Orozco, Helena / Giner-Llorca, Moisés / Marcos, Jose F / Manzanares, Paloma

    International journal of biological macromolecules

    2020  Volume 164, Page(s) 3922–3931

    Abstract: Antifungal proteins (AFPs) offer a great potential as new biofungicides to control deleterious fungi. The phytopathogenic fungus Penicillium expansum encodes three phylogenetically distinct AFPs, PeAfpA, PeAfpB and PeAfpC. Here, PeAfpA, a potent in vitro ...

    Abstract Antifungal proteins (AFPs) offer a great potential as new biofungicides to control deleterious fungi. The phytopathogenic fungus Penicillium expansum encodes three phylogenetically distinct AFPs, PeAfpA, PeAfpB and PeAfpC. Here, PeAfpA, a potent in vitro self-inhibitory protein, was demonstrated to control the infection caused by P. expansum in Golden apple fruits. We determined the production of the three proteins in different growth media. PeAfpA and PeAfpC were simultaneously produced by P. expansum in three out of the eight media tested as detected by Western blot, whereas PeAfpB was not detected even in those described for class B AFP production. Regardless of the culture medium, the carbon source affected Peafp expression. Notably, the production of PeAfpA was strain-dependent, but analyses of PeafpA regulatory sequences in the three strains studied could not explain differences in protein production. None of the PeAFPs was produced during apple infection, suggesting no relevant role in pathogenesis. PeAfpA together with PeAfpB and also with Penicillium digitatum PdAfpB showed synergistic interaction. The highly active antifungal PeAfpA also showed moderate antibacterial activity. We conclude that there is not a general pattern for Peafp gene expression, protein production or antimicrobial activity and confirm PeAfpA as a promising compound for postharvest conservation.
    MeSH term(s) Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Antifungal Agents/chemistry ; Antifungal Agents/pharmacology ; Food Microbiology ; Fruit/drug effects ; Fruit/microbiology ; Fungal Proteins/chemistry ; Fungal Proteins/pharmacology ; Malus/drug effects ; Malus/microbiology ; Penicillium/chemistry
    Chemical Substances Anti-Bacterial Agents ; Antifungal Agents ; Fungal Proteins
    Language English
    Publishing date 2020-08-29
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2020.08.208
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 2374: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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