The prospects for the food sector are promising, particularly in preservation, oxidation reduction, and integration with innovative processes. However, the transition from experimental applications to industrial solutions requires further validation. The use of hydrogen appears to be more of a complement to existing technologies than a standalone solution.
The reducing properties of molecular hydrogen are also attracting attention in the food industry. The potential applications primarily concern food preservation, packaging, processing, and stabilization, where controlling oxidation is often a decisive factor for product quality and shelf life. The goal, of course, is not to replace established technologies, but to understand whether hydrogen can make a tangible contribution to limiting certain oxidative processes, extending shelf life, and better preserving nutritional and sensory characteristics.
The potential is there, but must be viewed with a sense of realism. The use of hydrogen in the food industry requires thorough testing of its efficacy, safety, compatibility with various food matrices, process control, and regulatory compliance. Many applications remain experimental or, at the very least, require more robust industrial validation. The review “Hydrogen-Assisted Technologies in Food Processing, Preservation, and Safety,” published in Food Control in December 2025, analyzes this scenario by examining various application areas: from preservation to modified-atmosphere packaging, to non-thermal technologies, drying, and the use of hydrogenated water.
Properties of Hydrogen
Hydrogen is a colorless, odorless diatomic gas consisting of two covalently bonded atoms. It has a very low density of approximately 0.0899 g/L, high diffusivity, and good thermal conductivity under standard conditions. Its low molecular weight allows it to diffuse rapidly through gases, liquids, and biological membranes. From a chemical standpoint, hydrogen becomes particularly reactive in the presence of catalysts. This is the principle underlying lipid hydrogenation processes, already well-known in the food industry for modifying the texture, oxidative stability, and processing behavior of vegetable oils. In these processes, it reacts with the double bonds of unsaturated fatty acids, promoting the formation of saturated or partially saturated compounds.
Its reducing capacity can also help limit certain undesirable oxidative reactions, such as lipid rancidity, pigment degradation, and the alteration of sensitive molecules. This effect, however, cannot be taken for granted. It depends on operating conditions, the food matrix, the presence of catalysts, exposure time, and control of the process environment. From a plant engineering and safety perspective, hydrogen requires special attention. It is a highly flammable gas and has a wide explosive range in air, typically between 4% and 75%. Any industrial application must therefore include closed systems, detection sensors, adequate ventilation, controlled operating procedures, and specific safety protocols. When properly managed, hydrogen is considered non-toxic and does not directly alter the odor, color, or flavor of food. Its low solubility in water may limit some applications, while it can make it more suitable in the gaseous phase, in controlled atmospheres, or in dedicated systems.
Freezing and Control of Ice Crystals
One potential area of application involves freezing and low-temperature storage. Thanks to its thermal conductivity, which is higher than that of air, hydrogen could facilitate faster and more uniform heat transfer. For this reason, it can be evaluated as a heat transfer fluid for cooling and freezing food. During freezing, the rate of heat removal directly influences the size and distribution of ice crystals. Faster cooling tends to promote the formation of smaller crystals, reducing damage to cell membranes and the food’s structure.
This is particularly important for plant tissues, seafood, and meat, where large crystals can cause fluid loss during thawing and a deterioration in texture. Hydrogen may also help limit certain oxidative reactions associated with freeze-thaw cycles. A more reducing environment can help limit the oxidation of lipids, proteins, and pigments, particularly in products that are high in fat or sensitive to color changes. Here, too, caution is needed: its application requires targeted studies on the safety of concentrations, compatibility with existing equipment, and actual cost-effectiveness compared to already available rapid freezing technologies.
Hydrogen-Enhanced Modified Atmosphere
In modified atmosphere packaging, the most commonly used gases are nitrogen, carbon dioxide, and oxygen. The mixture is selected based on the product and the technological objective: to reduce oxidation, control microbial growth, maintain color, or extend shelf life. The integration of hydrogen into MAP systems can be seen as a potential development—still to be evaluated on a case-by-case basis—to limit lipid oxidation and pigment degradation, phenomena responsible for rancidity, color loss, and quality deterioration.
The most promising applications include meat, seafood, oils, high-fat foods, and products containing oxygen-sensitive bioactive compounds. Reducing available oxygen can also indirectly help control certain aerobic microorganisms. Hydrogen’s high diffusivity can promote uniform distribution within the packaging and on the product’s surface. At the same time, however, this characteristic makes it more difficult to maintain stable concentrations over time. Therefore, suitable barrier materials and monitoring systems capable of verifying the composition of the atmosphere throughout the product’s shelf life are required.
Hydrogen-Assisted Fermentations
The use of hydrogen in fermentation processes is a field still under development but of technical interest. Hydrogen can act as an electron donor in specific redox reactions and, under certain conditions, influence microbial activity and the formation of metabolites. This could affect the production of organic acids, aromatic compounds, bioactive molecules, and secondary metabolites. The presence of hydrogen can help create an environment with a low redox potential, which is favorable to certain anaerobic microbial populations and less suitable for undesirable oxygen-sensitive species.
The ability to steer specific metabolic pathways is particularly interesting, especially for fermented foods with targeted functional or sensory characteristics. The transition from theory to the production process is not straightforward. A thorough understanding of the interactions between gases, microorganisms, substrates, pH, temperature, and operating conditions is required. Industrial adoption therefore requires further studies to define reliable and reproducible parameters.
Hydrogen and Non-Thermal Food Technologies
Non-thermal technologies, such as high hydrostatic pressure, pulsed electric fields, ultrasound, and cold plasma, are among the main areas of innovation in food preservation. Their appeal stems from the potential to reduce the need for high temperatures, thereby better preserving color, texture, and nutritional value. The integration of hydrogen could help reinforce reducing conditions during or after treatment, limiting certain oxidative reactions affecting lipids, proteins, vitamins, and pigments. In some cases, it could also improve microbiological control.
Studies exist on the partial hydrogenation of oils using cold plasma, considered a potentially more sustainable alternative to conventional processes. Here, too, however, a cautious approach is warranted. Today, we are closer to applied research than to an established industry: the variability of foods and processing conditions requires a case-by-case evaluation.
Hydrogen-Assisted Drying
During drying, exposure to heat and oxygen can cause quality changes, especially in high-fat foods, antioxidant-rich plant-based products, functional ingredients, and matrices with high nutritional value. Limiting oxidation during drying can help preserve color, aroma, lipid stability, and nutritional profile. Thanks to hydrogen’s thermal conductivity and diffusivity, a more uniform heat distribution and improved mass transfer may be achieved, potentially reducing processing times.
A shorter process can also mean less exposure to intense thermal conditions, with benefits for the final quality. Another area of interest concerns the control of non-enzymatic browning, including the Maillard reaction, which can alter color, aroma, and organoleptic characteristics. Before considering large-scale applications, however, it will be necessary to demonstrate measurable advantages over existing solutions, including in terms of cost and safety.
Hydrogen-Enriched Water and Functional Beverages
In the functional beverage sector, water enriched with molecular hydrogen is one of the best-known commercial applications. Hydrogen is dissolved in the aqueous matrix and offered as a functional ingredient, without significantly altering the beverage’s color, odor, or flavor. Molecular hydrogen is being studied for its potential selective antioxidant action, particularly against certain reactive species. Several studies have evaluated its potential role in reducing oxidative stress, aiding recovery after physical activity, and promoting general well-being.
From a technological standpoint, the main challenge lies in hydrogen’s low solubility in water and its rapid dispersion. To maintain adequate concentrations over time, controlled saturation systems, suitable containers, and solutions capable of limiting gas loss during storage, distribution, and consumption are required. The challenge, therefore, is not only to enrich the beverage at the time of production but to ensure an effective and reproducible concentration until consumption.
Safety, Application Limits, and Future Prospects
We have seen how hydrogen-assisted technologies offer interesting prospects for the food sector, particularly in preservation, oxidation reduction, and integration with innovative processes. However, the transition from experimental applications to industrial- d solutions requires further validation. The main challenge remains safety, linked to hydrogen’s high flammability and the need for systems designed to prevent leaks, buildup, and potentially explosive conditions. Sensors, ventilation, closed systems, automated controls, and standardized operating procedures are essential elements. Another limitation concerns concentration management.
Hydrogen’s low solubility in aqueous systems and high diffusivity make it difficult to maintain stable hydrogen levels in food matrices and packaging. This requires specific materials, equipment, and control methods. Furthermore, the interactions between hydrogen, food, microorganisms, enzymes, and packaging materials need to be studied in greater depth. Each matrix may respond differently. For this reason, standardization of process parameters is necessary to achieve repeatable and comparable results. Looking ahead, hydrogen appears to be more of a complement to existing technologies than a standalone solution.
