scholarly journals Polyphenoloxidase (PPO): Effect, Current Determination and Inhibition Treatments in Fresh-Cut Produce

2021 ◽  
Vol 11 (17) ◽  
pp. 7813
Author(s):  
Sergio Nogales-Delgado
Keyword(s):  
Fruits And Vegetables ◽  
Synergistic Effects ◽  
Modified Atmosphere Packaging ◽  
Minimally Processed ◽  
Minimal Processing ◽  
Global Quality ◽  
Treatment Conditions ◽  
Speed Up ◽  
Fresh Cut ◽  
Processing Steps

Fresh-cut produce are quite popular among consumers due to their eating ease, high quality and functional content. However, some of the processing steps taking place during minimal processing (such as cutting, peeling, draining, etc.) might speed up decay, e.g., microbial growth, dehydration or browning. When it comes to the latter, polyphenol oxidase (PPO) plays an important role, being the center of many works focused on the understanding of its reaction mechanism and the application of conservative techniques. The aim of this review study was to compare recent research about the effect of PPO on minimally processed fruits and vegetables, trying to understand the way it acts, the measurement of its activity and current treatments, such as modified atmosphere packaging, washing treatments or edible coatings, among others. In conclusion, the combination of conservation techniques (that is, hurdle technology) is vital to guarantee global quality in minimally processed fruits and vegetables, including synergistic effects which will allow the use of mild treatment conditions to decrease PPO activity. However, further research is required to clearly understand PPO inhibition in trendy techniques such as irradiation.

Application of modified atmosphere packaging as a safety approach to fresh-cut fruits and vegetables – A review

2015 ◽  
Vol 46 (1) ◽  
pp. 13-26 ◽  
Author(s):  
M. Oliveira ◽  
M. Abadias ◽  
J. Usall ◽  
R. Torres ◽  
N. Teixidó ◽  
...  
Keyword(s):  
Fruits And Vegetables ◽  
Modified Atmosphere Packaging ◽  
Modified Atmosphere ◽  
Fresh Cut

scholarly journals Microbial quality and labeling of minimally processed fruits and vegetables

2021 ◽  
Vol 37 ◽  
pp. e37059
Author(s):  
Lucas Samôr dos Santos ◽  
Lucas Vasconcelos da Silva ◽  
Bárbara Morandi Lepaus ◽  
Jackline Freitas Brilhante De São José
Keyword(s):  
Escherichia Coli ◽  
Fruits And Vegetables ◽  
Material Selection ◽  
Microbiological Quality ◽  
Raw Material ◽  
Minimally Processed ◽  
Minimal Processing ◽  
Mesophilic Bacteria ◽  
Vegetable Samples ◽  
Safe Food

The consumption of minimally processed, or ready-to-eat (RTE), fruits and vegetables has been growing because people have shorter time to eat and due to the pursuit of convenience and health benefits. Minimal processing includes raw material selection and sorting, pre-washing, debarking, cutting, slicing, sanitizing, rinsing, centrifuging, and packing. Thus, natural protection barriers are affected during cutting methods and they release nutrients that enable microorganism growth.  The aim of the current study was to evaluate the levels of aerobic mesophilic bacteria, molds and yeasts, coliforms at 35°C, Escherichia coli and Salmonella sp., as well as the labeling adequacy of minimally processed fruits and vegetables traded in Vitória, Espírito Santo, Brazil. Fruits and vegetables presented aerobic mesophilic bacteria, molds and yeasts, and coliforms at 35°C, above the safe limit for consumption purposes. The count of aerobic mesophilic bacteria in RTE fruits ranged from 4.00 to 6.30 Log CFU/g. The highest count of this microorganism group was recorded for fruit salads. Salmonella sp. was not identified in fruit or vegetable samples, whereas Escherichia coli was detected in four vegetable samples. None of the evaluated labels (n = 40) followed the Brazilian legislation. Minimally processed fruits and vegetables had poor microbiological quality and labeling was also unsatisfactory. The adoption of good manufacturing practices and quality control tools as strategies to produce safe food can help minimizing risks to consumers’ health.

scholarly journals Effects of long-term controlled atmosphere storage, minimal processing, and packaging on quality attributes of calçots (Allium cepa L.)

2019 ◽  
Vol 26 (5) ◽  
pp. 403-412
Author(s):  
Lorena Zudaire ◽  
Inmaculada Viñas ◽  
Maribel Abadias ◽  
Tomás Lafarga ◽  
Gloria Bobo ◽  
...  
Keyword(s):  
Shelf Life ◽  
Allium Cepa ◽  
Modified Atmosphere Packaging ◽  
Vacuum Packaging ◽  
Modified Atmosphere ◽  
Controlled Atmosphere ◽  
Minimal Processing ◽  
Allium Cepa L ◽  
Fresh Cut

Calçots are the immature floral stems of the second-year onion ( Allium cepa L.) resprouts. Modified atmosphere packaging or vacuum packaging are suitable alternatives to preserve fresh-cut vegetables. The objective of this study was to evaluate the effect of postharvest storage time of raw vegetable stored under controlled atmosphere and used packaging system after minimal processing on the quality of fresh-cut calçots. Calçots used for minimal processing were stored under 1.0 kPa O2 + 2.0 kPa CO2 at 1 ℃ for 30 and 60 days. Fresh-cut calçots were packaged using passive modified atmosphere packaging or vacuum packaging and were stored at 4 ℃ for 15 days. Calçots stored under controlled atmosphere for 30 days presented better retention of quality and in turn, being more suitable for minimally processing. Vacuum packaging preserved the physicochemical quality of fresh-cut calçots better after 15 days. Mesophilic aerobic counts were also higher in fresh-cut calçots stored under modified atmosphere packaging, but all counts were below the recommended limits during and at the end of their shelf-life (15 days). The most suitable conservation strategy might be to store whole calçots under controlled atmosphere for 30 days and after minimally processing, packaged under vacuum in order to extend the shelf-life of fresh-cut calçots.

scholarly journals Tannin extracts on quality of fresh cut crisp leaf lettuce

2016 ◽  
Vol 46 (8) ◽  
pp. 1357-1363 ◽  
Author(s):  
Tâmmila Venzke Klug ◽  
Moises Jardim Segaspini ◽  
Júnia Capua de Lima Novello ◽  
Amanda Bianchini Moresco ◽  
Ana Raisa Paiva ◽  
...  
Keyword(s):  
Tap Water ◽  
Modified Atmosphere Packaging ◽  
Bacterial Count ◽  
Color Difference ◽  
Tannin Extract ◽  
Minimally Processed ◽  
High Reduction ◽  
Fresh Cut ◽  
Leaf Lettuce

ABSTRACT: In the present study, tannin extracts (rinsed or not) were compared to the use of sodium hypochlorite and tap water on fresh cut crisp leaf lettuce stored under modified atmosphere packaging. Effects of these sanitizers on total color difference and microbial levels of the product after sanitization and storage for 9 days at 3°C were evaluated. Performance of rinsed SM(r) tannin extract was comparable to the results of chlorine solution for all the analyzed parameters and; furthermore, that extract presented a high reduction in the initial bacterial count of minimally processed lettuce. However, storage of tannin extracts, did not impart better outcomes than the use of tap water. Therefore, the tannin extract storage SM(r) could be used in washing water to reduce the initial microbiological load, avoiding cross contamination in vegetables minimally processed.

scholarly journals Non-Conventional Tools to Preserve and Prolong the Quality of Minimally-Processed Fruits and Vegetables

Coatings ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 931-961 ◽  
Author(s):  
Maria Corbo ◽  
Daniela Campaniello ◽  
Barbara Speranza ◽  
Antonio Bevilacqua ◽  
Milena Sinigaglia
Keyword(s):  
Fruits And Vegetables ◽  
Storage Temperature ◽  
Modified Atmosphere Packaging ◽  
Special Focus ◽  
Modified Atmosphere ◽  
Modified Atmospheres ◽  
Physico Chemical ◽  
High O2 ◽  
Fresh Cut

The main topic of this paper is a focus on some non-conventional tools to preserve the microbiological and physico-chemical quality of fresh-cut fruits and vegetables. The quality of fresh-cut foods is the result of a complex equilibrium involving surface microbiota, storage temperature, gas in the headspace and the use of antimicrobials. This paper proposes a short overview of some non-conventional approaches able to preserve the quality of this kind of product, with a special focus on some new ways, as follows: (1) use of edible or antimicrobial-containing coatings (e.g., chitosan-based coatings) on fruits or vegetables; (2) alternative modified atmospheres (e.g., high O2-modified atmosphere packaging (MAP)) or the use of essential oils in the headspace; (3) conditioning solutions with antimicrobials or natural compounds for fruit salad; and (4) biopreservation and use of a probiotic coating.

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