scholarly journals Induction of Resistance to Postharvest Diseases and Extension of Shelf-Life of Fruits and Vegetables by Ultra-Violet Light

1994 ◽  
Author(s):  
Edo Chalutz ◽  
Charles Wilson ◽  
Samir Droby ◽  
Victor Gaba ◽  
Clauzell Stevens ◽  
...  
Keyword(s):  
Shelf Life ◽  
Induced Resistance ◽  
Fruits And Vegetables ◽  
Life Extension ◽  
Postharvest Diseases ◽  
Variable Response ◽  
Uv Treatment ◽  
Surface Sterilization ◽  
Biological Variables ◽  
Induction Of Resistance

Following preliminary observations by one of the collaborating scientists on this project and the completion of a 1-year, BARD-supported feasibility study (IS-1908-90F), this 3-year BARD project has been executed. The main objectives of the research were to elucidate biochemical and pathological aspects of UV-induced resistance in fruits and vegetables, to characterize physical and biological variables of induced resistance and delay of ripening, and to explore the application of the treatment as a control practice of postharvest diseases and shelf-life extension of fruits and vegetables. Our findings, which are detailed in numerous joint publications, have shown that the effect of UV-C light on induction of resistance and delay of ripening is a general one and of wide oddurrence. Apart from surface sterilization of the commodity, the reduction of decay of different fungi has been associated with and induced resistance phenomenon which gradually builds up within 24 to 48 hours after the UV treatment and can be reversed by visible light. In citrus, induced resistance has been associated with increased activity of the enzymes phenylalanine ammonia-lyase and peroxidase, and with the levels of endglucanase and chitinase. In tomato, resistance was correlated with the production of high levels of tomatine. Our study of some molecular aspects of the induced resistance in grapefruit has revealed the induction of a cDNA which represents a gene encoding for an isoflavone reductase-like protein that, in legumes, has been associated with phytoalexin biosynthesis. This gene was cloned and sequenced. Delay of ripening was associated in tomato with inhibition of ethylene production, carotenoid synthesis, and chlorophyll degradation and with the presence of high levels of polyamines. In peach fruit epiphytic populations of a yeast increased following the UV treatment. Pilot-size treatment and packing lines were constructed in the US and Israel to test the application of the UV treatment on a semi-commercial scale. Although effective in reduction of decay and delay of ripening, a number of problems will have to be addressed before practical application of this methodology can be realized. The main issues are associated with the temporal and variable response to the treatment, and its relationship to the maturity and date of harvest of the commodity.

scholarly journals Active and Intelligent Packaging with Phase Change Materials to Promote the Shelf Life Extension of Food Products

2020 ◽  
Author(s):  
Sasi Madhan ◽  
Christophe Espírito Santo ◽  
Luís P. Andrade . ◽  
Pedro D. Silva . ◽  
Pedro D. Gaspar .
Keyword(s):  
Phase Change ◽  
Shelf Life ◽  
Fruits And Vegetables ◽  
Phase Change Materials ◽  
Active Packaging ◽  
Life Extension ◽  
Box Dimension ◽  
Intelligent Packaging ◽  
Post Harvest ◽  
Shelf Life Extension

Active packaging aims to extend the shelf life of fruits and vegetables using active agents such as Oxygen, Carbon-di-oxide, ethylene scavengers and moisture absorber. Intelligent packaging provides information about the fruits quality inside the package to the customer and this packaging technology detects the internal changes of fruits and vegetables using sensors and indicators. Further to improve the post-harvest storage PCM such as Rubitherm can be used depending on the package box dimension to remove the field heat from the products and maintain its temperature with low variation during transport and display. Gel packs having less weight with PET and PS can also be an alternate method in the packaging. The application of these technologies may lead to a revolution in post-harvest storage, transportation, and further retail sale. This paper reviews the theoretical principles of food packaging and recent developments in packaging technologies using PCMs. Keywords: Active packaging, Intelligent packaging, Phase change materials, Shelf life extension, Fruits

scholarly journals The role of signal production and transduction in induced resistance of harvested fruits and vegetables

2021 ◽  
Vol 5 ◽  
Author(s):  
Bin Wang ◽  
Yang Bi
Keyword(s):  
Signal Transduction ◽  
Disease Resistance ◽  
Induced Resistance ◽  
Fruits And Vegetables ◽  
Research Progress ◽  
Future Research ◽  
Signal Molecules ◽  
Postharvest Diseases ◽  
Resistance Response

Abstract Postharvest diseases are the primary reason causing postharvest loss of fruits and vegetables. Although fungicides show an effective way to control postharvest diseases, the use of fungicides is gradually being restricted due to safety, environmental pollution, and resistance development in the pathogen. Induced resistance is a new strategy to control postharvest diseases by eliciting immune activity in fruits and vegetables with exogenous physical, chemical, and biological elicitors. After being stimulated by elicitors, fruits and vegetables respond immediately against pathogens. This process is actually a continuous signal transduction, including the generation, transduction, and interaction of signal molecules. Each step of response can lead to corresponding physiological functions, and ultimately induce disease resistance by upregulating the expression of disease resistance genes and activating a variety of metabolic pathways. Signal molecules not only mediate defense response alone, but also interact with other signal transduction pathways to regulate the disease resistance response. Among various signal molecules, the second messenger (reactive oxygen species, nitric oxide, calcium ions) and plant hormones (salicylic acid, jasmonic acid, ethylene, and abscisic acid) play an important role in induced resistance. This article summarizes and reviews the research progress of induced resistance in recent years, and expounds the role of the above-mentioned signal molecules in induced resistance of harvested fruits and vegetables, and prospects for future research.

scholarly journals Active Casein Coatings and Films for Perishable Foods: Structural Properties and Shelf-Life Extension

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 899
Author(s):  
Muhammad Rehan Khan ◽  
Stefania Volpe ◽  
Marika Valentino ◽  
Nicoletta Antonella Miele ◽  
Silvana Cavella ◽  
...  
Keyword(s):  
Shelf Life ◽  
Bioactive Compounds ◽  
Fruits And Vegetables ◽  
Methodological Approach ◽  
Relevant Literature ◽  
Food Additives ◽  
Food Products ◽  
Life Extension ◽  
Decay Kinetics ◽  
Shelf Life Extension

There is an urgent need to increase the food supplies to fulfil the demands of future generations as the population of the world is expected to grow beyond 10 billion by 2050. An essential component for ensuring global food security is to reduce food losses during the post-harvest stage. Active edible coatings and films are a promising sustainable preservation technology for shelf-life extension of food products by hindering decay kinetics of minimally processed fruits and vegetables (F&V), by restricting the mass transfer of moisture, aroma, or gases and carrying an active compound, such as an antioxidant or antimicrobial. Active protein-based coatings and films have the potential to extend the shelf-life of food products by decreasing their respiration rates, as they exhibit an excellent gas barrier and good mechanical properties as compared to other biopolymeric packaging. Among protein-based biopolymers, casein and its derivatives as packaging films have been extensively studied due to their low cost, complete biodegradability, and availability. Currently, there is no review study focusing on caseinate-based active coating and film, thus, this review aims to give insights on the composition, rheology, structure, and properties of caseinate-based formulations by critically discussing the results presented in the literature. A methodological approach was followed to obtain relevant literature to discuss the influence of additives on the shelf-life of F&V. Furthermore, changes in secondary structure of casein were observed after incorporation of bioactive compounds (i.e., phenolic acids). Likewise, there is a need to explore chemical interactions among bioactive compounds and biopolymer material by using in silico and laboratory trials as food additives have shown to influence the physicochemical properties of film and shelf-life of food products.

scholarly journals Quality Retention and Shelf-life Extension in Mediterranean Cucumbers Coated with a Pectin-based Film

2012 ◽  
Vol 1 (3) ◽  
pp. 159 ◽  
Author(s):  
M. Moalemiyan ◽  
H. S. Ramaswamy
Keyword(s):  
Weight Loss ◽  
Shelf Life ◽  
Respiration Rate ◽  
Fruits And Vegetables ◽  
Storage Conditions ◽  
Quality Parameters ◽  
Soluble Solids ◽  
Life Extension ◽  
Post Harvest ◽  
Cold Room

<p>Edible coating is a simple and inexpensive concept for extending post-harvest life of fruits and vegetables. In this study, cucumbers were coated with different pectin-based emulsions to preserve the fruit quality and extend the post harvest shelf life. The formulations consisted of pectin, beeswax, sorbitol, water, and an emulsifying agent. By monitoring the physiological and quality parameters, the coating effects on the storability of cucumber fruits at 23°C and 40% RH (display cabinet), and 12°C and 85% RH (cold room) were determined. The parameters included weight loss, respiration rate, firmness, color, soluble solids and chlorophyll content. The coating markedly reduced weight loss and respiration rate at both temperatures. In addition, the coating reduced loss of firmness, color, chlorophyll and total soluble solids, and extended the storage life of cucumber fruits at both storage conditions.</p>

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