Between 30 and 40% of the world's fresh fruit is lost between harvesting and consumption due to physiological damage, bruising, rot, and breaks in the cold chain. This represents a huge economic loss for producers and exporters, but also a serious problem of food waste and sustainability.
The good news is that the combination of new post-harvest technologies for fruit —edible coatings, biocontrol, dynamic controlled atmosphere, IoT sensors, active packaging, UV-C, ozone, cold plasma, 1-MCP , automation, and nanotechnology—is making it possible to double or even triple the commercial shelf life of many species, reduce losses, open up distant markets, and comply with increasingly strict regulations on food safety and residues.
Current context of post-harvest handling of fruit trees
The post-harvest stage is the most delicate in the entire fruit supply chain : once the fruit leaves the tree, we can only maintain (or lose) the quality achieved in the field. It cannot be improved, but its shelf life can be extended with appropriate harvesting, pre-cooling, handling, storage, and transport practices and technologies.
In exporting regions like Latin America, the Upper Valley of Río Negro, and the major fruit-growing areas of Chile and Spain , the pressure is twofold. On the one hand, destination markets (EU, US, Asia) demand fruit with minimal pesticide residues, a long shelf life, and impeccable firmness and appearance. On the other hand, climate change is generating more heat waves, unseasonal rains, new physiological disorders, and increased pathogen pressure.
In this context, post-harvest losses of 30-40% are unacceptable. Companies investing in advanced solutions—controlled and modified atmosphere packaging, physical treatments, coatings, smart packaging, and digitalization of the cold chain—are achieving lower rejection rates, higher sales volumes, and better access to premium categories.
Public research (INTA, INIA, universities, centers such as CITAAC, ICAR-IARI, universities in Mexico, India, the USA, etc.) and the private sector (AgroFresh, Hazel Technologies, sorting companies such as UNITEC, coatings and bio-inputs firms, IoT and marine controlled atmosphere providers such as StarCare) are pushing a very clear technological leap from now until 2025 and beyond.
Edible coatings and biological treatments
One of the fastest-growing areas is the use of edible coatings of natural origin and biological treatments as an alternative (or complement) to synthetic waxes and fungicides. The idea is simple: apply an ultrathin film to the fruit's surface that regulates gas and water exchange and strengthens its defenses against fungi.
These coatings are made with polysaccharides (alginates, chitosan), proteins, plant waxes, and botanical extracts . They act as a semipermeable barrier: reducing moisture loss, moderating respiration and ethylene release, and delaying senescence. In practical terms, the fruit maintains greater firmness, better color, and improved texture during storage and distribution.
The published trials show very concrete results. A chitosan-based coating combined with moringa extract on avocados reduced weight loss and respiration after three weeks of cold storage compared to a control group, while maintaining noticeably firmer flesh. In sweet cherries, formulations with alginate and olive leaf extract slowed ripening and helped maintain anthocyanin and vitamin C levels after about 20 days.
Commercial biopolymer coating solutions are already available on the market. A European company has reported that its formulation extended the shelf life of apples and citrus fruits under refrigeration by up to three weeks , and has been well received by organic producers, as the products are compatible with organic certifications and are easily integrated into spray or dip packaging lines.
Advantages include their relatively low cost, minimal environmental footprint, partial or total replacement of synthetic waxes and fungicides, and ease of implementation without major infrastructure changes. The downside is that their effectiveness depends heavily on the species, stage of maturity, and storage conditions , so it's advisable to validate the protocol for each crop before scaling up.
In parallel, biological post-harvest treatments based on antagonistic microorganisms (yeasts, Bacillus, Pseudomonas) and biostimulants that modulate fruit physiology are gaining ground. In strawberries, for example, an INIA project in Chile has used improved (non-GMO) yeasts that release a natural gas transmitter: a three-day longer commercial window without rot was achieved compared to the control, while maintaining good color and texture in a fruit with a very short shelf life.
Other trials with beneficial bacteria and seaweed extracts demonstrate appreciable reductions in rot without resorting to synthetic fungicides, which helps to comply with maximum residue limits and improves the product's image in particularly demanding markets.
Controlled atmosphere, AM and advanced refrigeration
Controlled atmospheres (CA) and modified atmospheres (MA) remain the cornerstone of preserving climacteric fruits (apples, pears, kiwis, avocados, plums, etc.) for months. Adjusting oxygen, carbon dioxide, and relative humidity levels to specific ranges reduces respiration, ethylene production, and the growth of fungi such as Botrytis; for example, CO₂ concentrations close to 15% in berries can significantly decrease mold development.
In recent years, dynamic controlled atmosphere (DCA) has emerged as a powerful technology . Unlike static CA, which maintains fixed compositions, DCA uses sensors (laser or infrared) and intelligent software to continuously adjust the gas mixture based on the fruit's response, evaluating respiration in real time.
Trials on 'Duke' blueberries have shown that gradually lowering O₂ to around 5 kPa and raising CO₂ to 10 kPa over 3-7 days , instead of doing so abruptly, reduces tissue stress and extends shelf life by approximately 25% compared to conventional static controlled atmosphere storage. The berries are 27% firmer after 28 days, with improved sugar and vitamin C retention.
At the commercial level, in addition to large airtight chambers, air-conditioned (AC) bags or sleeves are being implemented for each pallet , creating independent mini-chambers. These are very useful for batches differentiated by variety, producer, or quality, and for packing facilities that cannot accommodate large storage areas. In maritime transport, refrigerated containers with active AC and nitrogen (N₂) generators and carbon dioxide (CO₂) absorbers , such as those used on certain specialized lines, allow cherries, berries, and tropical fruits to be transported for 30 to 40 days while maintaining firmness and appearance levels superior to traditional methods.
Another key parameter, often underestimated, is relative humidity . Increasing it from 90% to 95% in Golden Delicious apples, for example, reduces shrinkage and weight loss. Ultrasonic humidification systems installed in cold storage help maintain RH within optimal ranges (85-95% depending on the variety), preventing surface dehydration that detracts from the product's appearance and reduces marketable weight.
Regarding refrigeration, the first critical step is rapid pre-cooling . So-called high-speed Californian tunnels propel cold air at 3-4 m/s through the pallets, allowing the fruit to lose field heat in a fraction of the time: for strawberries, conventional cooling can be reduced from 3-4 hours to 45-60 minutes . This better preserves turgor, firmness, color, and flavor.
Although they use powerful fans, the cycle is completed so quickly that overall energy consumption drops by 25 to 35% . Furthermore, weight loss due to cooling typically decreases from 0,8-1,2% to around 0,2-0,4%, which translates directly into more saleable kilograms per batch processed and a daily processing capacity that can triple.
In cold-sensitive stone fruit (peach, plum, nectarine), high humidity, staggered cooling, and, in some cases, AM/AC strategies are combined to minimize physiological damage. Integrating rapid pre-cooling with dynamic controlled atmosphere generates clear synergies in final quality.
IoT sensors, automation and Big Data in post-harvest
The digitization of the cold chain has gone from being a luxury to a necessity. Today, it is possible to deploy IoT sensor networks that continuously measure temperature, relative humidity, O₂, CO₂, ethylene, and even compounds such as ethanol or acetaldehyde, early indicators of unwanted fermentation.
These sensors are placed in chambers, pre-cooling tunnels, containers, and increasingly, inside boxes or pallets . The data is sent to cloud platforms, where Big Data algorithms and artificial intelligence generate alerts, analyze trends, and enable predictive maintenance of refrigeration equipment.
Some refrigerated shipping systems transmit the internal conditions of the containers minute by minute , so that the exporter and importer can monitor the cargo from their mobile phones, without needing to open doors —which avoids temperature shocks— and with the ability to act if deviations appear.
Specialized technology companies have begun integrating sensors for ethylene, volatile compounds, firmness, and enzymatic activity into AI models that predict the future quality of a batch. These real-time "thermal maps" pinpoint hotter areas within a storage chamber, allowing for pallet redistribution and ventilation adjustments before the situation escalates into a serious rot problem.
For small and medium-sized farms, the entry point is usually simpler: temperature and humidity data loggers per pallet or per box , with download via Bluetooth or GSM, already represent a significant leap forward compared to having no information at all. From there, it's possible to scale towards more complex solutions with remote equipment control, integration with warehouse management systems, traceability, and, in the near future, blockchain to record the entire product history from field to consumer.
Active and intelligent packaging
Packaging is not just an aesthetic matter; it has become a key tool for controlling the microenvironment surrounding the fruit and for communicating its actual condition. Two main categories stand out: intelligent packaging (which provides information) and active packaging (which takes action).
Smart packaging incorporates indicators or sensors that change color or display a message when a certain ripeness is reached, pH increases, or gas levels such as ethylene exceed thresholds. In this way, producers, retailers, and even consumers can know if the fruit is at its optimal point of consumption without opening the package.
In parallel, active packaging directly modifies the internal environment of the tray, bag, or box. Some devices absorb moisture, oxygen, or ethylene (desiccant sachets, potassium permanganate supports, films with clays or nanoparticles), while others slowly release CO₂, inert gases, or natural antimicrobial compounds such as essential oils and plant extracts.
A frequently cited example in berry production is the BreatheWay® membrane, developed to automatically adjust gas exchange according to temperature. This technology "breathes" (allows more or less O₂ and CO₂ to pass through) depending on external conditions, so that when the temperature rises, the system compensates for changes in the fruit's respiration rate.
In trials with packaged raspberries, the use of these membranes has allowed for more stable gas proportions even when the temperature is raised to around 7°C, resulting in 15-30% more marketable fruit . By day 11 of storage, the packages with this technology showed approximately 24,7% more fruit in good condition and around 44% fewer quality problems (fungus, dehydration) compared to the control.
In practice, many exporters combine these resources: full pallets under controlled atmosphere liners, plus active membranes and smart labels that record temperature. This hybrid strategy protects the physical quality of the product while also providing reliable information for managing claims and optimizing logistics.
Chemical-free disinfection: UV-C, ozone and cold plasma
The reduction in the use of synthetic fungicides in post-harvest treatment is already a reality in many markets, driven by both regulatory restrictions and the demand for residue-free fruit. Physical disinfection techniques stand out in this regard, as they eliminate or reduce the microbial load without leaving chemical traces.
UV-C irradiation (around 254 nm) has been used for years in fruit packing facilities. Exposing fruit to UV-C lamps for a few seconds on conveyor belts, in tunnels, or in dry cleaning systems damages the DNA of surface fungi and bacteria, limiting their multiplication. This energy-efficient technology requires no water and produces no toxic byproducts , making it highly compliant with international food safety audits.
However, the dose must be precisely calibrated according to the species and condition of the fruit, because excessive exposure can cause small necrosis or spots on the epidermis, especially in more sensitive varieties.
Gaseous ozone (O₃) is another powerful ally. Its strong oxidizing capacity is used to disinfect storage chambers and atmospheres. Ozone generators release very controlled amounts into the chamber air, where they react with the cell membranes of fungi and bacteria, significantly reducing the number of spores suspended in the air and on the surface of the fruit.
Ozone has the advantage of rapidly decomposing into oxygen (O₂) , leaving no residue. Significant reductions in rot have been documented in citrus fruits and berries during prolonged storage. The key is to maintain concentrations around a few ppm to avoid phytotoxicity and damage to plant tissues or the storage facilities themselves.
More emerging, but very promising, is the use of atmospheric cold plasma , which generates a flow of ionized air at ambient pressure with free radicals, ions, and small amounts of ozone in situ. These reactive species deactivate microorganisms on the surface without heating or water. Although most of the work is still in the pilot phase—mainly on berries and tomatoes—the results show effective inactivation of gray mold without affecting organoleptic quality.
Along similar lines is the ionization of air in cold storage rooms using negative ion generators. Some commercial systems report reductions of 20-30% in mold incidence during prolonged storage, acting as a complement to general hygiene and other atmosphere management technologies.
Nanotechnology, new materials and cryopreservation
Advances in nanotechnology applied to post-harvest handling are opening up solutions that were recently considered science fiction. Ultra-thin nanocoatings are being developed that act as barriers against moisture and microbial contamination, and nanoabsorbents are being created that can precisely regulate ethylene levels within packaging.
Nanoencapsulation of antimicrobial agents (e.g., botanical extracts) allows for gradual release, prolonging their effect without altering the fruit's aroma or flavor. This extends shelf life with very low doses and directs the active molecules precisely where they are needed.
In parallel, cryopreservation at ultra-low temperatures is being researched and applied for the preservation of germplasm of high-value crops (alliums such as onions and garlic, among others). Although the objective here is more long-term genetic conservation than the commercialization of fresh fruit, it relies on techniques such as vitrification and encapsulation-dehydration, which also provide knowledge applicable to extreme storage.
In the packaging sector, biopolymers and nanocomposites are reinventing packaging solutions. Materials are being developed that offer better barriers to oxygen, water vapor, and microorganisms , and are also biodegradable or easily recyclable. Some incorporate nanosensors that monitor temperature, humidity, and freshness in real time, generating useful information for adjusting marketing timelines and minimizing waste.
Automation, advanced classification, and machine vision
The post-harvest handling and sorting link is also undergoing a revolution. Companies like UNITEC and other international firms have developed fully integrated lines for some 50 types of fruit, with solutions 100% designed and manufactured at the source, covering everything from fruit reception to final packaging.
These systems combine precision mechanics, electronics, automation software, and ultra-high-definition vision systems to classify fruit by size, color, shape, and external and internal quality. Artificial intelligence and machine learning enable the detection of defects with a precision far superior to that of the human eye and at speeds that would simply be impossible to achieve manually.
Non-destructive methods such as near-infrared spectroscopy (NIRS) are used to estimate soluble solids content, firmness, and the presence of internal defects. This allows for much more reliable separation of first-grade, second-grade, and processing fruit, optimizing the commercial destination of each batch.
In parallel, precision harvesting tools and mulching and cushioning materials (biodegradable foams, reusable protectors) have become more widespread to reduce mechanical damage during harvesting and transport. Careful handling from the field directly translates into fewer subsequent losses.
In the logistics field, mobile refrigeration units powered by solar energy are being installed for the transport of perishable fruit in remote regions or with limited access to the electricity grid, helping to maintain the cold chain from the first kilometer.
Research trends, conferences and future outlook
The landscape of research in postharvest biology and technology reveals an increasingly broad agenda. Specialized conferences—such as the 5th Argentine Congress of Postharvest Biology and Technology or international meetings in Chile, Mexico, India, and other countries—address topics ranging from postharvest physiology, stress, diseases, and pathology to genetic improvement focused on quality and functional compounds.
There is a clear trend toward linking post-harvest handling with nutrition and health : it is no longer enough to deliver "nice and firm" fruit to China or European supermarkets; it is essential to ensure that it retains its nutritional value, antioxidants, and nutraceutical potential. This is the case with blueberries, whose purchase in Asia is strongly associated with their content of bioactive compounds, or with Japanese plums, where phenols and other functional components are being measured in different varieties and stages of ripeness to guide breeding programs.
Another growing focus is understanding how pre-harvest factors (climate, management, nutrition, coverings) influence post-harvest response . Changes in radiation, extreme temperatures, or the use of plastic coverings can modify storage potential, susceptibility to chilling injury, or the development of physiological disorders. Research on table grapes, for example, shows that the use of plastic coverings reduces defects associated with cuticle integrity, rot, and SO₂ damage after 30–45 days of chilling, especially under challenging climates.
New post-harvest diseases and specific physiological disorders are also being described : cases such as Cadophora luteo-olivacea in kiwifruit, linked to low dry matter and calcium content; “Peteca” in winter lemon, which increases with higher CO₂ levels; or cold damage in pomegranate, which can be mitigated with passive modified atmosphere and the use of suitable macro-perforated bags.
Artificial intelligence applied to shelf-life prediction is another hot topic. Machine learning models analyze data on temperature, humidity, gases, and fruit properties to predict deterioration, optimize storage conditions, and plan logistics. When this information is combined with blockchain and distributed sensors , we will be able to track the "life history" of each batch of fruit in real time, from the farm to the table.
Looking ahead, the priority will be to scale these technologies to affordable costs , with a particular focus on small and medium-sized farms. The development of efficient, low-cost cold storage, active and intelligent biodegradable packaging, and user-friendly monitoring systems will be key to democratizing access to innovation.
Ultimately, the future of post-harvest fruit handling lies in integrating science, technology, and sustainability : reducing waste, better preserving nutrients and sensory attributes, saving energy and water, complying with strict food safety regulations, and, at the same time, offering fruit that provides clear added value to the consumer. Those who can combine natural coatings, good harvesting practices, efficient refrigeration, well-managed atmospheres, smart packaging, and a robust digital infrastructure will have a competitive advantage that will be very difficult to match.