Abstract
Food wastage is a major issue impacting public health, the environment and the economy in the context of rising population and decreasing natural resources. Wastage occurs at all stages from harvesting to the consumer, calling for advanced techniques of food preservation. Wastage is mainly due to presence of moisture and microbial organisms present in food. Microbes can be killed or deactivated, and cross-contamination by microbes such as the coronavirus disease 2019 (COVID-19) should be avoided. Moisture removal may not be feasible in all cases. Preservation methods include thermal, electrical, chemical and radiation techniques. Here, we review the advanced food preservation techniques, with focus on fruits, vegetables, beverages and spices. We emphasize electrothermal, freezing and pulse electric field methods because they allow both pathogen reduction and improvement of nutritional and physicochemical properties. Ultrasound technology and ozone treatment are suitable to preserve heat sensitive foods. Finally, nanotechnology in food preservation is discussed.
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Introduction
Food is vital for human survival and development. A recent review shows that food transmission of the coronavirus disease 2019 (COVID-19) is overlooked (Han et al. 2020). Food can be consumed in raw or processed form to obtain energy and sustain growth. Food wastage has become a major issue worldwide in the recent times. A considerable amount of food gets wasted at various stages of the food production and consumption chain. According to the report of Rethink Food Waste Through Economics and Data (ReFED), the data in Fig. 1 show the food wastage distribution for various types of food materials (ReFED 2016). Globally, due to inefficient supply chains, rising population and climate change, a large number of people are deprived of food on regular basis (Leisner 2020). Griffin et al. (2009) showed a detailed study about the waste generation of different food communities. Out of the food waste generated, 20% comprised production waste, 1% of processing waste, 19% of distribution and 60% of consumer generated waste. The major reasons for wastage were due to shrinkage of food while cooking, manufacturing issues, supply chain barriers, high consumer standards, changing climatic conditions, soil runoffs and policy constraints (Bräutigam et al. 2014; Silvennoinen et al. 2014; Filimonau and De Coteau 2019; Gomez-Zavaglia et al. 2020).
A recent analysis conducted in Finland in 2019 found more than 50% of the food waste is from households (Filimonau and De Coteau 2019). The decision between ‘best before’ or ‘use by’ was a tough call to take in determining shelf life of product for the customers.
However, with the increase in population, consumers demand food that is fresh, healthy and nutritious. Although enough food is produced every day to feed the world, the technology and food produced fails to reach those in need. Thus, food wastage has become a key challenge to in all food processing sectors.
Any kind of food when harvested begins to show spoilage responses. One of the sustainable solutions to counter the food wastage issues is food preservation. The idea of food preservation was introduced in the ancient times when our ancestors were finding ways to keep the food fresh and edible. Concepts like sun drying, salting and pasteurization were introduced depending on climatic and seasonal factors. Preservation enabled humans to form communities, stopped them from killing animals and brought about a leisure attitude keeping food for additional time.
Rapid industrialization and advent of lean methods paved the way for processes like thermal treatment, canning and freezing which gave a better shelf life extension by controlling the pathogens. However, food safety and security became a major concern due to the growing population and increasing consumer standards and demands providing healthy and nutritious food (Saravanan et al. 2020). Thus, the concept of preserving food grew rapidly with an aim to provide food to all. The goal of food preservation is to inhibit any biochemical reactions and to restrict entry of bacteria or fungi. The technique allows minimization of wastage with improved shelf life extension. Some of the popular conventional preservation techniques like heating, drying and freezing have been implemented in large industries (Pereira et al. 2018; Białkowska et al. 2020; Said 2020). However, it has been found that there are certain disadvantages in heat treatment and freezing methods such as food shrinkage, texture and nutrient loss and organic properties leading to a huge overall loss in the food product (Jayasena et al. 2015).
In the recent years, chemical and microbiological treatments have been carried out with additives, coatings and various polyphenolic plant extracts thus posing an effective solution to food preservation. There is a lack of research in bridging the gap between the food wastage and food preservation techniques. This review investigates the upcoming food preservation technologies which are likely to play a dominant role in the food preservation industry. Current trends and advancements in preservation techniques and their applications to foods including fruits, vegetables, liquid foods and spices are the key aspects discussed here. The review covers a wide range of changes brought in conventional technologies and current technologies in the above fields. Special focus is also given to nanotechnology with its application in foods, agriculture and packaging sectors. The data have been collected after an extensive literature search over the subject surveyed for the last 15 years taking into account the challenges faced in industry during preservation. This work could be a perfect platform for understanding the advancements in food preservation techniques and its relevance to industry. The advent of nanotechnology in research and a combination of various advanced technologies as discussed in the literature (Butnaru et al. 2019; Nile et al. 2020; Rech et al. 2020; Tsironi et al. 2020) as well as in this manuscript could be the “go-to” technologies in the future. Thus, positive steps need to be taken to narrow down on the enhancements of these technologies for having a sustainable and cost-effective lifestyle.
Prevalent food preservation technologies
Thermal treatment
Heat or thermal treatment is considered as one of the novel techniques for food preservation. For many years, the technique is well proven in various food sectors: from bakery and dairy to fruits and vegetables (Wurlitzer et al. 2019; Gharibi et al. 2020; Prieto-Santiago et al. 2020; Christiansen et al. 2020). The process generally involves heating of foods at a temperature between 75 and 90 °C or higher with a holding time of 25–30 s. Study on preservation enhancement of apple juice beverage by pasteurization and thermal treatment of maize showed a great impact on the flavor, digestibility, glycemic index, aroma, color and sensory attributes (Charles-Rodríguez et al. 2007; Zou et al. 2020). A recent report also highlighted five different types of rice when undergoing hydrothermal treatment showing results in par with respect to the quality of market rice (Bhattacharyya and Pal 2020).
The heating of foods reduces the pathogens. However, extensive research has also concluded nutrient losses, energy wastages, flavor changes and reduction in the food matrix (Roselló-Soto et al. 2018). A study conducted on light and dark honey showed changes in physicochemical characteristics, antioxidant activities and nutrient variations post-treatment (Nayik and Nanda 2016; Zarei et al. 2019). Liquid foods, juices and beverages too have a negative impact causing gelatinization and browning reactions (Codina-Torrella et al. 2017; de Souza et al. 2020). Over the years, constant investigation has been done on optimization studies of heat on exposure of food to improve its shelf life. Adjustments and slight modification to former technologies have recently contributed to significant advances with a combination of electrical and thermal methods. Different processes like electroplasmolysis, ohmic heating, and microwave heating of foods have created a dramatic impact in the food industry advancements. Table 1 shows the advanced electrothermal treatment techniques applied to different foods.
Freezing
Cooling and freezing of products have been extensively applied for preservation of leafy vegetables, spices and milk products to maintain the sensorial attributes and nutrition qualities. Extensively used freezing techniques involve air blast, cryogenic, direct contact and immersion freezing, while advanced techniques involve high pressure freezing, ultrasound assisted freezing, electromagnetic disturbance freezing and dehydration freezing (Cheng et al. 2017; Barbosa de Lima et al. 2020). Cooling and freezing process mainly relies on the process of heat transfer. During cooling, there is a transfer of heat energy from the food and packaged container to the surrounding environment leading to an agreement of cooling. Thus, thermal conductivity and thermal diffusivity greatly affect the cooling or freezing rate. During the recent years, the storage technique has gained significant interest with the start of ready-to-eat foods catering to the needs of the consumer. The foods with their appropriate packaging material and cool temperature will always inhibit entry of microorganisms as well as maintain food safety. Although cooling and freezing are effective in their own terms, cooling time, uneven speed of ice crystal formation, storage expenses and specialized environments are concerning issues. In order to understand and overcome these challenges, technological tools like three-dimensional mathematical models and computational fluid dynamics models were evaluated to understand the heat transfer and fluid flow patterns with various food formulations thus showing an approach to minimize the issue (Zhu et al. 2019a, b; Barbosa de Lima et al. 2020; Brandão et al. 2020; Stebel et al. 2020). Table 2 shows a description of the various advanced freezing techniques applied to different foods.
Ultrasound
Ultrasound treatment involves use of high intensity and frequency sound waves which are passed into food materials. The efficient technology is chosen due to its simplicity in the equipment usage and being low cost as compared to other advanced instruments. The versatility of ultrasound is shown in its application in different fields ranging from medicine, healthcare to food industry (Dai and Mumper 2010).
Figure 2 illustrates a representation of different types of sonicators used for powdered and liquid foods. The process deals with ultrasonic radiation passing through the target solution. This action causes a disturbance in the solid particles in the solution leading to particles breaking and diffusing into the solvent (Cares et al. 2010). It should be noted that the intensity of the technique should be kept constant. This is because as intensity increases, intramolecular forces break the particle–particle bonding resulting in solvent penetrating between the molecules, a phenomenon termed as cavitation (Fu et al. 2020; Khan et al. 2020). Further enhancement of ultrasound extraction is dependent on factors like improved penetration, cell disruption, better swelling capacity and enhanced capillary effect (Huang et al 2020; Xu et al 2007). Table 3 shows the types of ultrasound technologies available which have created paths for efficiency improvements.
Ultrasound is slowly paving way into two most thriving sectors in the food industry, namely wine making and dairy production. Figure 3 shows the thermosonication process widely used in processing of milk and wine.
Milk is generally pasteurized in various industries to prevent spoilage and kill the microorganisms present. The utilization of a low-frequency ultrasound or combination of thermosonication (to 11.1 s) or manothermosonication could enhance the safety, quality and functional properties of product by 5 log times (Bermúdez-Aguirre et al. 2009; Deshpande and Walsh 2020; Gammoh et al. 2020). Low-frequency ultrasound alone has also played a significant role in improving the textural and homogenization effects of yoghurt, cheese and skimmed milk (Yang et al. 2020). With a shorter time interval, and thermosonication-applied (20 kHz, 480 W, 55 °C) production was improved to 40% and also had a positive impact on its organoleptic properties (Tribst et al. 2020).
Production of wine fermentation and alcoholic drinks always faces an issue in tackling microorganisms or yeast. Conventional methods generally involve use of chemical preservatives like sulfur oxide to prevent spoilage or thermal pasteurization followed by filtration to get the pure beverage. A recent study reported significant reduction of about 85–90% lactic acid bacteria with high power ultrasound at 24 kHz for 20 min for treatment of wine (Luo et al. 2012; Gracin et al. 2016). However, careful handling should be carried out in order to maintain the flavor and texture (Izquierdo-Cañas et al. 2020; Xiong et al. 2020).
Ultrasound studies have also found applications in isolation of bioactive compounds and processing pastes and juices in many fruits and vegetables. Recently, the technique was used to find the total phenolic content in spices like saffron (Teng et al. 2019; Azam et al. 2020; Yildiz et al. 2020). Table 4 shows the application of ultrasound technologies for various food crops. Thus, it can be concluded that ultrasound is a more sustainable technique than other traditional drying treatments.
Ozone treatment
With the growing demands of consumer slowly moving towards healthy meals and sustainable lifestyle, the demand for organic foods have increased rapidly. Consumers need a functional food that is free from additives, preservatives with a decent shelf life span. Thus, the concept of ozone treatment technology has risen in recent years. The reason for choosing ozone is due to its diverse properties and quick disintegration.
In simple words, ozone is an allotrope of oxygen. The molecule is formed when oxygen splits into a single oxygen or nascent oxygen in the presence of light or ultraviolent radiation. Ozone formation is described by chemical equations as mentioned below (Eqs. 1 and 2) (Brodowska et al. 2018).
The compound quickly decomposes into oxygen molecule and possess a high oxidation potential (2.07 V) making it a good antimicrobial and antiviral agent (Fisher et al. 2000; Nakamura et al. 2017) as compared to chemical preservatives like chlorine (1.35 V), hydrogen peroxide (1.78 V) and hypochlorous acid (1.79 V) (Pandiselvam et al. 2019; Afsah-Hejri et al. 2020). Apart from this, ozone removes the necessity to store harmful chemicals as the gas can be made instantly. The energy required is also minimal as compared to thermal treatment giving more importance to the shelf life (Pandiselvam et al. 2019).
Over the recent years, ozone has been listed by the Food and Drug Administration (FDA) as a generally recognized as safe (GRAS) solvent. This has led to a demanding choice in food processing and preservation sectors to ensure safety and standards in products. When in comparison with chlorine, its degradation leaves negligible residue when treated with solid foods or beverages. The technology in combination with ultrasound was also shown to enhance the bacterial safety without any damage in cabbages (Mamadou et al. 2019). Consumer grade ozone was recently proven effective in disinfecting plastic boxes for storage (Dennis et al. 2020).
Table 5 shows the effect of ozone treatment on pesticide degradation in various fruits and vegetables production. The effect of ozone treatment depends on the type of pesticide and food material, environmental conditions, time interval and the strength of pesticide. When horticulture crops were compared, tomato and lettuce had the best pesticide removal efficiency while apple and chili were the least. It was seen that the type of food matrix and structure also play a key role in preventing the growth of pathogens. Ozone can thus be considered as an advanced emerging method for multiple sectors due to its feasibility, easiness and less time consumption.
Pulse electric field
Pulse electric field technology is an advanced pre drying treatment involving shorter residence time for treatment of foods. The method was widely recognized due to its continuous operation and low requirement of electric fields (1–5 kV/cm). The method could be considered as a substitute for thermal drying and could enhance the food drying as it requires a very low temperature of 40 °C for functioning (Barba et al. 2015; Wiktor et al. 2016). Figure 4 shows the representative diagram of the process involved in treatment of liquid foods and paste using pulse electric field.
The methodology of pulse electric field involves placing the food (fruit, vegetable, milk or any juices) between two electrodes after which a pulse is applied with high voltage (50 kV/cm) for short time intervals. The principle is a combination of electroporation and electropermeabilization (Barba et al. 2015). The electric field breaks the cell membrane matrix of the food thus enhancing the nutritive qualities, safety and increasing shelf life. The factors affecting pulse electric field involve field strength, pulse width, frequency, treatment time, polarity and temperature used (Odriozola-Serrano et al. 2013; Wiktor et al. 2016).
Over the years, demand for pulse electric field has grown drastically in all food sector areas. It can be used for destruction of bacteria (E coli) in milk. The treated milk was found to be high in quality and possessed an increased shelf life. A recent investigation was also carried out on watermelon and citrus juices which showed changes in physicochemical and antimicrobial properties (Aghajanzadeh and Ziaiifar 2018; Bhattacharjee et al. 2019). Table 6 summarizes the outcomes of application of pulse electric field treatment on various food materials.
Nanotechnology for food preservation
Nanotechnology has become a huge breakthrough with great potential to promote sustainability. It integrates branches of applied sciences such as physics, biology, food technology, environmental engineering, medicine and materials processing. In simple terms, nanotechnology involves any material or nanoparticle having one or more dimensions to the order 100 nm or less (Auffan et al. 2009; He et al. 2019). The technology is preferred as they possess different properties like slow release action, target specific nature, precise action on active sites and high surface area (Joshi et al. 2019). The reason for the success of nanotechnology is due to its promising results, no pollutant release, energy efficient and less space requirements. Apart from these success factors, nanotechnology has also shown versatile applications in terms of safety, toxicity and risk assessment in areas of agriculture, food and environment (Kaphle et al. 2018). Figure 5 shows the different avenues of nanotechnology development in the food sector.
Nanomaterials are broadly classified into two types, namely organic and inorganic, depending on their nature and functionalities (Table 7).
Nanotechnology has been regarded as a promising tool for growing the economy in near future as well as maintaining the plant growth and nutritional qualities of the food commodity. Use of nanofertilizers and precision farming has posed several benefits in weed control and decrease in chemical pesticide thus enhancing shelf life. Growing use of nanotechnology in agro-food system industry may even pose as a solution to solve challenges in food security and agriculture (Yata et al. 2018; Ghouri et al. 2020). The three primary avenues where the technology could grow include food processing, agriculture and packaging.
Nanotechnology in food processing
The concept of nanotechnology has paved the way in processing and formulation of colorants, sensors, flavors, additives, preservatives and food supplements (nanoencapsulation and nanoemulsion) in both animal and plant based products (He et al. 2019). The diversity of nanotechnology in various fields has led to introduction of nanosensors in food processing industries. Nanomaterials have shown several electrochemical and optical properties in different sauces, beverages, oils and juices. Table 8 shows the different nanomaterials used as sensors in food industry.
Distinctive characteristics have shown great qualities in the area of food processing as ingredients and supplements. Oxide chemicals such as magnesium oxide and silicon dioxide can act as a food flavor, food color and a baking agent. The use of titanium dioxide has also been certified as an additive in gums, sauces and cakes (Weir et al. 2012). Additionally, copper oxide, iron oxide and zinc oxide have been categorized as GRAS materials by European Food Safety Authority (EFSA) for animal and plant products (He et al. 2019).
Nanotechnology in agriculture
The use of nanotechnology in agriculture and the concept of precision agriculture has gained a lot of interest in the recent years. The main goal of agriculture is to reduce the volume of chemicals, minimize nutrient losses and increase the overall performance of crops. Although chemical fertilizers are added for increasing the crop yields, it pollutes and harms the soil, water, food and environment (Riah et al. 2014). Precision agriculture is one of the green ways to tackle this issue. It is a system based on artificial intelligence that understands crop quality, soil quality and detects weed controls generally through drones. The area has recently gained interest in nutritional management and various optical properties to address food wastage and to feed the growing population (Duhan et al. 2017). Majority of plant species (cereal grains like wheat, rice, barley, tobacco, soybean, rye) follow the biophysical process of photosynthetically active radiation and electron transport. These targets have been identified to improve photosynthesis activity.
There has been many discussions and investigation on the concept of plant nanobionics and photosynthesis. Plant nanobionics deals with appropriate insertion of nanoparticles into the chloroplast of the plant cell for improving the plant productivity. It has been proven that titanium dioxide nanoparticles (nTiO2) have become the “go-to” nanoparticles for efficient photosynthesis process (Hong et al. 2005; Gao et al. 2006, 2008). The application of nTiO2 with spinach and tomato leaves under mild heat stress improved the overall photosynthesis process showing significant improvement in the transpiration and conductance rates (Gao et al. 2008; Qi et al. 2013).
Nanomaterials like silver ions, polymeric compounds and gold nanoparticles are also being investigated for use in pesticides. Usage of gold and silver nanoparticles has also had a positive effect to restrict the pest and improve plant growth (Ndlovu et al. 2020). Studies have also investigated on sulfur-based nanoparticle (35 nm) for organic farming which prevent fungal growth from apple tomatoes and grapes (Joshi et al. 2019).
Nanotechnology in food packaging
Many fresh fruits and vegetables are sensitive to oxygen, water permeability and ethylene leading to deterioration of food quality (Gaikwad et al. 2018, 2020). Thus, food packaging plays a critical role in addressing this issue. Nanoparticles and polymer-based composites have proven to be the best solutions (Auffan et al. 2009; Joshi et al. 2019). The application of a natural polymer or a biopolymer and coating it on the food surface has recently shown promise in preserving foods (Luo et al. 2020). Table 9 shows the different applications of nanomaterials used in food packaging. Although the application of nanomaterials in smart packaging is in its early stage, rapid advancements have been carried out through the years as it offers safe and sustainable approach (Rai et al. 2019).
The usage of chitosan and chitosan-based additives and films has been recently explored with multiple functionalities with positive outcomes. Chitosan-based films, in general, possess antioxidant, antimicrobial and antifungal properties making it a good replacement for synthetic chemicals (Yuan et al. 2016; Yousuf et al. 2018). The use of chitosan-based derivatives offer a promising solution towards maintaining the shelf life of foods without disturbing its sensorial properties (Kulawik et al. 2020). A recent study proved that chitosan-based matrices can also be used for clarification, preservation and encapsulation of different beverages (alcoholic, non-alcoholic as well as dairy based), fruit juices, tea and coffee (Morin-Crini et al. 2019). Apart from this, nanocomposites (combination of different nanomaterials) have shown efficient thermal and barrier properties at a low cost. Researchers evaluated the concept of the nanocomposites membranes and concluded that it decreased the water permeability in foods by a value of 46 (Jose et al. 2014). An increase in corrosion resistance was evaluated with use of clay and epoxy composites (Gabr et al. 2015).
Edible coatings with nanomaterials have also shown increasing potential towards food storage of fruits and vegetables. These coatings hold useful while transportation from factory to retailers and also maintain the nutritional qualities without causing any physical damage. Edible coatings are generally prepared from fats, proteins and polysaccharides which have been shown to block gases. Nanoclays and nanolaminates have also shown promising results to improve their barrier properties to gases for efficient food packaging (Echegoyen et al. 2016). Nanolaminates involve layer-by-layer deposition of a special coating where the charged surface is applied on food. The application of carbon nanotubes as nanofillers in gelatin films has also been successfully demonstrated (Rai et al. 2019). The biofilms are found to have improved tensile strength, mechanical, thermal and antimicrobial properties (Jamróz et al. 2020; Zubair and Ullah 2020). Thus, nanomaterials have emerged as an integral part while addressing nanotechnology in food packaging.
Conclusion
With tons of foods being wasted every single day, food preservation has been the need of the hour for extending the shelf life to help feed millions of people globally. Although plenty of advanced technologies have been introduced, major strides need to be taken to have a sustainable food system. Availability, access and proper utilization of food should be well balanced in order to understand the value of food security. It is important to maintain a correct and precise balance of technology with respect to design and cost effectiveness. Constant investigation is also being carried out in the area of finding more natural preservatives with excellent antioxidant and antimicrobial properties as they are safe to consume and eliminate processed food. The concept of hurdle technology, which combines multiple techniques to measure different variables like temperature, water activity, pH, moisture content and enzyme activities has also been explored to meet the consumer demands for an efficient food system. Another growing solution is in the area of nanotechnology in foods which has been discussed in this article. However, research on different nanomaterials, its toxicity, its safety to consumers and genetic factors is still under debates and discussions. The concept of bioencapsulation and nanoencapsulation in food supplements and drug developments is also growing at a fast pace keeping in mind the health and environmental effects. Further work needs to be done in data visualization and artificial intelligence, internet of things and machine learning. This would help changing the food and agricultural industry in the area of functional foods and crops through digitalization.
Abbreviations
- ReFED:
-
Rethink Food Waste Through Economics and Data
- GAE:
-
Gallic acid equivalent
- TPC:
-
Total phenolic content
- FDA:
-
Food and Drug Administration
- GRAS:
-
Generally recognized as safe
- EFSA:
-
European Food Safety Authority
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The authors are thankful to Sivaraman Prabhakar for insightful discussions.
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Sridhar, A., Ponnuchamy, M., Kumar, P.S. et al. Food preservation techniques and nanotechnology for increased shelf life of fruits, vegetables, beverages and spices: a review. Environ Chem Lett 19, 1715–1735 (2021). https://doi.org/10.1007/s10311-020-01126-2
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DOI: https://doi.org/10.1007/s10311-020-01126-2