ABOUT US

The large part of fresh products in the UE are produced in Mediterranean countries due to their favourable climatology. Many of these products, classified as climacteric (e.g., tomatoes, avocados, pears and apples) present a continuous postharvest ripening, that occurs evolving respiration gases and the production of Volatile Organic Compounds - VOCs like ethylene that work as a natural ripening hormone that leads to undesirable and progressive ripening and senescence during the storage / transportation steps. Multiple strategies have been developed to control ethylene production and/or removal in order to slow down maturation and extend the shelf life of climacteric fruits and vegetables. In this project the photooxidation of ethylene using solar radiation will be carried out saving energy and avoiding additional emissions of CO2 or other pollutants. For that, different research group with large experience in the preparation of different types of nanomaterials (zeolites, carbons, MOFs) and their applications (adsorbents, catalysts, antibacterial/antifungic) will coordinate their efforts trying to optimize filters and reactors able to be integrated in the recirculation circuit of refrigeration chambers for the storage / transport of perishable fruits. These new nanomaterials will be prepared by advanced techniques of synthesis and specifically designed routes in order to improve the required characteristics (high adsorption capacity, reversible adsorption, photoactivity under solar light and antibacterial performance), but also integrating different types of agricultural residues in the synthesis of these nanomaterials, thus avoiding the accumulation of wastes and improving the circular economy of the agri-food chain. It should be possible for most produce to use a technology that provides the required postharvest life at a reduced cost, and with some reduction in greenhouse gas emissions.

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Period of Implementation

Dec 1, 2020 - May 31, 2024
Total Budget

EUR 0.00

OUR IMPACT

Goals

Nano4fresh aims to extend the shelf-life of perishable products, reducing post-harvest chemical treatments (e.g. ethylene inhibitors and antibacterial/antifungic) during the transport and storage period, food losses and wastes. This will be achieved by developing nanomaterials (carbons, zeolites, MOFs and PCPs) with innovative and versatile characteristics, in terms of adsorption, catalytic photoactivity and antibacterial/fungi performances, to surpass the current state-of-the-art approaches for prevention of the ripening processes of food products.

Objectives

Development of a series of nanomaterials with fitted physicochemical properties to be used in devices (filters or photoreactors) for the optimisation of the atmosphere surrounding perishable products (fruits, vegetable or flowers) during their storage/transport steps in the agri-food chain, trying to avoid premature aging of the products with the subsequent loss of quality or even the discard of significant parts of these products. This approach comprises the ethylene removal, both during long storage, transportation and at the retail stores, leading to eradicate the use of chemicals as a post-harvest strategy to prevent the ripening process. The developed technology will be tested, and the performances validated in a laboratory-controlled and real-life environment to supply fruit quality parameters (colour, compactness, sugar content, enzymatic activity) in the presence and absence of developed devices.

Problems and Needs Analysis

The economic, environmental and social impact of agriculture and the derived agri-food sectors have a strong importance in many areas that depend on the export of agri-food products to different EU countries, North Africa and America. The problem is that many of these products are perishable. Basically, products classified as climacteric present a continuous postharvest ripening, that occurs evolving respiration gases and the production of VOCs like ethylene that works as a natural ripening hormone. This leads to undesirable and progressive ripening and senescence during the storage / transportation steps. The biochemical changes associated to ripening also causes physiological alterations (changes of colour, softening, decay, loss of firmness and crunch, rind breakdown, internal disorders and finally putrefaction) not allowing its commercialization and leading to significant economic loss and waste generation. Therefore, one of the main challenges in the agri-food chain is the optimization of perishable products handling for maximizing their freshness, organoleptic characteristics, quality, and shelf life allowing extension of post-harvest life and transportation to new markets.

Intervention Strategy(ies)

This project will try to implement green and sustainable strategies for the benefit of perishable products, avoiding loss of products and generation of wastes and by promoting a circular economy that will have a positive impact in multiple stakeholders of the agri-food value chain. It has three strategic objectives: 1. Development of innovative breakthrough strategies for ethylene removal, surpassing the current state-of-the-art approaches. 2. Eradicate the use of chemicals as a post-harvest strategy to prevent the ripening process using a green, ecological and sustainable technologies within the storage chambers (both during long storage, transportation and at the retail stores); 3. Development of novel filters and photoreactors for optimisation of the storage (atmosphere control) process during the ripening process; Two different approaches will be used for the ethylene removal from warehouse, cold rooms or transportation vehicles: (1) adsorption and (2) photooxidation. It is expected an improvement of the performance of the devices used for the ethylene removal by improving the physicochemical properties of adsorbents and photocatalysts by specific and advanced techniques of synthesis (hydrothermal, sol-gel, doping, etc), obtaining nanomaterials with tuned properties for each application. The porous, crystallographic, chemical and surface properties of different types of nanomaterials, from nanocarbons to pure inorganic oxides, zeolites, MOFs, PCPs or composite materials (carbon-metal oxide and carbon-metal compounds) will be optimised in this way. The efficiency of the system will be also evaluated and optimized considering different environments: the influence of temperature, ventilation and humidity, the presence of other evolved VOCs in competition with ethylene, or the oxygen and CO2 levels will be studied. The combination of both adsorption and photocatalytic approaches will be also checked trying to combine the advantages of both processes in a multilayer fixed reactor.

Impact Pathway

Nano4Fresh technologies application are for post-harvest strategies and logistic solutions to reduce food losses during storage and transportation. Knowing that ethylene is pivotal in the ripening of climacteric fruits, there is also a great interest on the use of ethylene and other VOCs in the ripening of fruits in pre-climacteric stage , the stage of the fruits at picking date. The reversibility of the adsorption process will be used in the attempt to maintain fresh the product by adsorbing VOCs and thus preserving the pre-climacteric state for different periods of time, simulating the required storage/transport conditions. Then ethylene will be desorbed to favor the maturation of the fruits after this period, the shelf life period that simulates the arrival to the destination market. On the other hand, we must consider that VOCs are main pollutants of the air and should be oxidized avoiding emissions to the atmosphere

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