Foodborne Outbreaks and Potential Routes of Contamination in Fresh and Fresh-Cut Fruits and Vegetables

2016 ◽  
pp. 34-51 ◽  
Keyword(s):  
Fruits And Vegetables ◽  
Foodborne Outbreaks ◽  
Fresh Cut

scholarly journals Study on browning mechanism of fresh-cut eggplant (Solanum melongena L.) based on metabolomics, enzymatic assays and gene expression

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiaohui Liu ◽  
Aidong Zhang ◽  
Jing Shang ◽  
Zongwen Zhu ◽  
Ye Li ◽  
...  
Keyword(s):  
Gene Expression ◽  
Fruits And Vegetables ◽  
Solanum Melongena ◽  
Downward Trend ◽  
Glutathione Metabolism ◽  
Phenylpropanoid Metabolism ◽  
Kegg Pathways ◽  
Maximum Value ◽  
Cut Time ◽  
Fresh Cut

AbstractEnzymatic browning is one of the crucial problems compromising the flavor and texture of fresh-cut fruit and vegetables. In this study, an untargeted metabolomics approach based on liquid chromatography-mass spectrometry (LC–MS) was used to explore the browning mechanism in fresh-cut eggplant. Metabolomics studies showed that with the increase of fresh-cut time, the contents of 946 metabolites changed dynamically. The metabolites having the same trend share common metabolic pathways. As an important browning substrate, the content of chlorogenic acid increased significantly, suggesting that may be more important to fresh-cut eggplant browning; all 119 common differential metabolites in 5 min/CK and 3 min/CK contrastive groups were mapped onto 31 KEGG pathways including phenylpropanol metabolism, glutathione metabolism pathway, et al. In physiological experiments, results showed that the Phenylpropanoid-Metabolism-Related enzymes (PAL, C4H, 4CL) were changed after fresh-cut treatment, the activities of three enzymes increased first and then decreased, and reached the maximum value at 5 min, indicating the accumulation of phenolic substances. At the same time, ROS were accumulated when plant tissue damaged by cutting, the activities of related antioxidant enzymes (SOD, APX and CAT) changed dynamically after oxidative damage. SOD and APX content increased significantly and reached the maximum value at 10 min after cutting, and then showed a downward trend. However, CAT activity increased sharply and reached the maximum value within 3 min after cutting, then maintained the same activity, and showed a downward trend after 30 min. These data fully demonstrated that the activities of browning related enzymes and gene expression increased with the prolonging of fresh cutting time. We explained the browning mechanism of fresh-cut eggplant by combining metabolomics and physiology, which may lay the foundation for better understanding the mechanism of browning during the fruits and vegetables during processing.

Cold plasma processing of fresh-cut fruits and vegetables

2020 ◽  
pp. 339-356
Author(s):  
Cherakkathodi Sudheesh ◽  
Kappat Valiyapeediyekkal Sunooj
Keyword(s):  
Cold Plasma ◽  
Fruits And Vegetables ◽  
Plasma Processing ◽  
Fresh Cut

Efficacy of Commonly Used Disinfectants for the Inactivation of Calicivirus on Strawberry, Lettuce, and a Food-Contact Surface

2001 ◽  
Vol 64 (9) ◽  
pp. 1430-1434 ◽  
Author(s):  
BALDEV R. GULATI ◽  
PAUL B. ALLWOOD ◽  
CRAIG W. HEDBERG ◽  
SAGAR M. GOYAL
Keyword(s):  
Phenolic Compounds ◽  
Fruits And Vegetables ◽  
Virus Titer ◽  
Ammonium Compound ◽  
Food Contact ◽  
Food Contact Surfaces ◽  
Environmental Surfaces ◽  
Foodborne Outbreaks ◽  
Food Contact Surface ◽  
Contact Surfaces

Norwalk and Norwalk-like viruses (NLVs) are important causes of foodborne gastroenteritis in restaurant-related outbreaks. Efficacy of common disinfection methods against these viruses on food-contact surfaces and fresh produce is not known partially because of their nonculturability. Seven commercial disinfectants for food-contact surfaces and three sanitizers for fruits and vegetables were tested against cultivable feline calicivirus (FCV). Disks of stainless steel, strawberry, and lettuce were contaminated with known amounts of FCV. The disinfectants were applied at one, two, and four times the manufacturer's recommended concentrations for contact times of 1 and 10 min. The action of disinfectant was stopped by dilution, and the number of surviving FCVs was determined by titration in cell cultures. An agent was considered effective if it reduced the virus titer by at least 3 log10 from an initial level of 107 50% tissue culture infective dose. None of the disinfectants was effective when used at the manufacturer's recommended concentration for 10 min. Phenolic compounds, when used at two to four times the recommended concentration, completely inactivated FCV on contact surfaces. A combination of quaternary ammonium compound and sodium carbonate was effective on contact surfaces at twice the recommended concentration. Rinsing of produce with water alone reduced virus titer by 2 log10. On artificially contaminated strawberry and lettuce, peroxyacetic acid and hydrogen peroxide was the only effective formulation when used at four times the manufacturers' recommended concentration for 10 min. These findings suggest that FCV and perhaps NLVs are very resistant to commercial disinfectants. However, phenolic compounds at two to four times their recommended concentrations appear to be effective at decontaminating environmental surfaces and may help control foodborne outbreaks of calicivirus in restaurants.

Isolation and Pulsed-Field Gel Electrophoresis Typing of Listeria monocytogenes from Modified Atmosphere Packaged Fresh-Cut Vegetables Collected in Ireland

2006 ◽  
Vol 69 (10) ◽  
pp. 2524-2528 ◽  
Author(s):  
GILLIAN A. FRANCIS ◽  
DAVID O'BEIRNE
Keyword(s):  
Listeria Monocytogenes ◽  
Gel Electrophoresis ◽  
Fruits And Vegetables ◽  
Pulsed Field Gel Electrophoresis ◽  
Leafy Vegetables ◽  
Modified Atmosphere ◽  
Pulsed Field ◽  
Fruit Samples ◽  
Fresh Cut ◽  
Pfge Profiles

The incidence of Listeria monocytogenes in modified atmosphere packaged fresh-cut fruits and vegetables from chill cabinets of a supermarket in Ireland was investigated over a 2-year period. Overall, 9.58% of fresh-cut produce was contaminated with Listeria spp. Various species of Listeria were isolated from samples, including L. monocytogenes, L. seeligeri, L. innocua, L. welshimeri, and L. ivanovii. No fruit samples contained detectable L. monocytogenes. Overall, a total of 21 L. monocytogenes isolates (2.9% of samples) were recovered from a range of products, including dry coleslaw mix (80% shredded cabbage and 20% shredded carrot), bean sprouts, and leafy vegetables such iceberg, romaine, and radicchio lettuce and mixed salad leaves (curly endive, escarole, and radicchio leaves). Dry coleslaw mix appeared to have the highest incidence of Listeria contamination (20%) compared with other products. Listeria contamination was more frequent (P < 0.05) during the summer and autumn months than during the winter and spring months. The 21 L. monocytogenes isolates were subsequently subtyped by genomic macrorestriction techniques using ApaI with pulsed-field gel electrophoresis (PFGE). PFGE of digested DNA produced bands of 79 to 518 kb. Four PFGE profiles were identified, and approximately 50% of the isolates were associated with profile 1. This study indicates that fresh-cut vegetables packaged under a modified atmosphere can support growth of numerous species of Listeria, including L. monocytogenes.

Microbiological and Safety Aspects of Fresh-Cut Fruits and Vegetables

2010 ◽  
pp. 53-86
Author(s):  
Peter Ragaert ◽  
Liesbeth Jacxsens ◽  
Isabelle Vandekinderen ◽  
Leen Baert ◽  
Frank Devlieghere
Keyword(s):  
Fruits And Vegetables ◽  
Safety Aspects ◽  
Fresh Cut
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