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Ahmed, S. Bio-Preservation of Bread. Encyclopedia. Available online: https://encyclopedia.pub/entry/19632 (accessed on 15 November 2024).
Ahmed S. Bio-Preservation of Bread. Encyclopedia. Available at: https://encyclopedia.pub/entry/19632. Accessed November 15, 2024.
Ahmed, Shafi. "Bio-Preservation of Bread" Encyclopedia, https://encyclopedia.pub/entry/19632 (accessed November 15, 2024).
Ahmed, S. (2022, February 18). Bio-Preservation of Bread. In Encyclopedia. https://encyclopedia.pub/entry/19632
Ahmed, Shafi. "Bio-Preservation of Bread." Encyclopedia. Web. 18 February, 2022.
Bio-Preservation of Bread
Edit
This entry is adapted from the peer-reviewed paper 10.3390/foods11030319

Bread is a food that is commonly recognized as a very convenient type of food, but it is also easily prone to microbial attack. As a result of bread spoilage, a significant economic loss occurs to both consumers and producers. The bakery industry has sought to identify treatments that make bread safe and with an extended shelf-life to address this economic and safety concern, including replacing harmful chemical preservatives. New frontiers, on the other hand, have recently been explored. Alternative methods of bread preservation, such as microbial fermentation, utilization of plant and animal derivatives, nanofibers, and other innovative technologies, have yielded promising results. 

bakery products bio-preservatives shelf-life mold spoilage antifungal activity microbial fermentation active packaging

1. Introduction

For thousands of years, bread is still one of the dominant food sources of the human diet, with the manufacturing of yeast-based and sourdough bread being one of the earliest biotechnological mechanisms [1]. Amidst its medium growth rate (122,000 t in 2007 to 129 t in 2016), it earned approximately $358 billion in global revenue in 2016 [2]. It is also a magnificent energy source, including protein, iron, calcium, and various vitamins [3][4][5][6]. Commercially available bread and biscuits contain nearly 7.5 and 7.8% protein [7]. Bakery products are ideal for fiber addition, as fiber intake has declined in the European diet partially due to cereal adjustments.
Due to the easily spoiled nature of this food, its quality and palatability degrade during preservation, resulting in changes in physiological, biochemical, sensorial, and microbial properties [8]. Mold and fungal deterioration are the primary causes of significant financial detriments in packed bread items. They may also be considered as mycotoxins sources [9], posing issues to the people′s health [10][11][12][13] and putting a significant financial strain on bakeries. Penicillium (Penicillium chrysogenum, Penicillium roqueforti, and Penicillium brevicompactum), Aspergillus (previously Eurotium), Wallemia, and other familiar molds such as Rhizopus, Chrysonilia sitophila, and Mucor are the main genera involved in the spoiling of bakery items [14][15][16]. Yeasts, specifically Saccharomycopsis fibuligera and Hyphopichia burtonii, can also contribute to the “chalk mold” problem [7]. Due to these microbial attacks, a high proportion of food waste is being produced around the globe. For example, in Germany in 2015, 34.7% of total bread was lost [17]. Article [18] estimated losses of 10% in Brazil and presumably other nations with a tropical environment. Additionally, mycotoxin infection in food items is claimed to be a universal issue [19][20][21][22] and it occurs in nearly 25% of all grain yields globally [23]. A study conducted in Poland identified nine categories of causes of losses based on a quantitative study within the four considered sectors of the bakery enterprise: (i) raw materials magazine—mechanical damage, magazine pests, spoiling, molding, and impurities; (ii) production section—hygiene and sanitary requirements, technical breakdowns; (iii) final product magazine—damaged packaging, hygiene and sanitary requirements/food safety hazards, technical breakdowns; and (iv) final product transport—errors in placed orders, damaged unit packaging, technical breakdowns, incomplete collective packaging [24]. In all of them, mold and fungal deterioration may cause losses.
Today’s food industry faces a tremendous problem in producing goods that are not only productive but also wholesome for customers, as well as much more long-lasting. The use of organic preservatives has the feasibility of meeting both needs [25][26]. Natural antimicrobial preservatives have been the subject of extensive research due to the growing evidence of the harmfulness of chemical preservatives and their impacts on consumer health [27][28][29]. The restoration of chemical preservatives—such as propionates and sorbates—in bread and other bakery goods is of considerable interest [25].
Chemical preservatives, such as calcium propionate, are commonly applied to expand the microbial lifespan of bread [30][31]. However, prolonged exposure to chemical preservatives may pose a health risk. Thus, using bio-preservation techniques on bread can aid in solving this issue and preventing economic loss caused by fungi, mold, or yeast [32]. Bio-preservatives are organic resources that can be utilized to lower or eliminate microbial populations while improving food quality. It is a revolutionary concept for processing and preserving perishable fresh goods and is generally recognized as safe (GRAS) for food usage. Numerous distinct studies have been conducted on bio-preservation.

2. Bio-Preservation to Control the Spoilage of Bread

The bakery sector uses product reformulation, which is the most popular, practical, and cost-effective solution to prevent post-baking contamination. This is done by lowering the product’s aw and pH, which are related to the microorganisms’ shelf life. They also use chemical preservatives directly in the product or on its surface to prevent bacterial and microbial spoilage [33]. According to [34], chemical preservatives inhibit microbial metabolism by denaturing cell protein or causing physical damage to the cell membrane. Propionic acid, as well as its salt, are the most widely used chemical preservatives in bread [7]. It helps prevent mold deterioration and bread ropiness that occurs due to B. subtilis.
However, they are continually investigated due to the possibility of developing chronic non-communicable diseases [35]. As a result, bio-preservatives have emerged as a favored solution to these shortcomings, with the intention to generate “clean label” foods [15][36][37]. Bio-preservatives can also be adopted as natural antifungal substances to prevent fungal degradation and prolong shelf life, reducing public health risks [2][12]. Bio-preservatives such as lactic acid bacteria, essential oils, or natural nanoparticles are becoming more popular because of consumer apprehensions about applying chemicals in food. According to [38][39][40][41][42][43], a good bio-preservative should have the following characteristics: it should have an expansive antibacterial spectral range, be non-toxic to humans, be suitable for lower doses, have some slight impact on product pH, not impair product odor, color, or flavor at the proposed level of its use, be accessible in a dry state, have a higher water solubility, be non-corrosive, be unreactive, and have no detrimental effects on fermentation or bread character.The researchers will review a few of the bio-preservatives in the following sections.

2.1. Microbial Fermentation

Traditionally, organic and flavorful bread with a long shelf life was achieved naturally through an expanded fermenting operation: sourdough [11][44][45][46][47][48][49]. The word “sourdough” describes a particular bread recipe in which flour, water, LAB, and yeast organisms are fermented together [49][50][51][52][53]. Because of their remarkable antifungal activity, lactic acid bacteria (LAB) and antagonistic yeasts have received particular attention among natural agents [53][54][55][56][57] and are herein discussed below as well as presented in a tabular form (Table 1).
Table 1. Preservation technique by microbial fermentation to improve bread shelf life.
Microbes Product Starter Culture Used,
Compounds		 Shelf Life/Fungal
Inhibition		 Reference
Lactic acid bacteria Pan bread Lactobacillus plantarum 7 days after baking, A. niger growth was lower [58][59][60]
Quinoa and rice bread Lactobacillus reuteri, Lactobacillus brevis. 2 days extended shelf life [53][61][62][63]
Bread Lactobacillus plantarum >14 days extended shelf life [64][65][66][67]
Gluten-free breads Lactobacillus amylovorus 4 days extended shelf life [59]
Bread P. acidilactici KTU05-7, P. pentosaceus KTU05-8, and KTU05-10 8 days fungal growth inhibition [60]
Bread Lactobacillus hammesii 6 days extended mold-free shelf life. [68][69][70][71]
Bread Lactobacillus plantarum 1A7 Up to 28 days fungal inhibition [64]
Yeast Pan bread Penicillium anomala SKM-T Overall storage life is 6–8 days, when appearing with fewer fungi count [65]
Wheat sourdough W. anomalus LCF1695 Up to 14 days shelf life [64]
Lactic acid bacteria: LAB metabolic products enhance bread’s organoleptic and technological aspects, as well as its textural characteristics [41][42][72][73][74][75][76], along with its shelf life, nutritional value [43][77][78][79][80][81], and beneficial aspect (anticarcinogenic and cholesterol reduction abilities), during the fermentation of the dough [44][45][46][82][83][84][85][86]. They can also be adopted to replace chemical preservatives, ensuring a clean label and increased consumer acceptance [47][86][87][88][89].
Lactic acid bacteria (LAB) have been utilized in fermented foods for over about 4000 years [48]. It is naturally found in foods or introduced as pure cultures [49]. It is also GRAS-certified (generally recognized as safe) and has an extended application history in various cereal fermentations, particularly in the baking industry. LAB’s adaptability is remarkable, not just in terms of catabolic and anabolic pathways but also in changing environmental conditions [50][90][91][92][93][94].
It has also been employed as a starter culture in the food business for centuries, which may produce several bioactive compounds, along with fatty acids, bacteriocins, organic acids, hydrogen peroxide, indole lactic acid, and phenyl lactic acid [51]. They also have an anti-aflatoxigenic effect [52][95][96][97][98]. Particular lab strains that have gripping bio-preservation action on bread when adopted as starter cultures include Lactobacillus amylovorous DSM 19,280, Lactobacillus fermentum Te007, Lactobacillus acidophilus ATCC 20079, Lactobacillus paralimentarius PB127, Lactobacillus brevis R2D, Lactobacillus rossiae LD108, Lactobacillus hammesii, Lactobacillus paracasi D5, Pediococcus pentosaceus KTU 05-8 and KTU 05-10, Lactobacillus pentosus G004, Lactobacillus plantarum, Lactobacillus reuteri R29, Lactobacillus rhamnosus, Lactococcus BSN, Pediococcus acidilactici KTU05-7, as well as Leuconostoc citreum C5 and HO12 [53][99][100][101][102]. Additionally, adding 15–20% sourdough significantly (p = 0.0001) increased bread volume and crumb porosity, based on the LAB strain, and reduced acrylamide formation by an average of 23% (for LUHS51 and LUHS206) and 54% (for LUHS71 and LUHS225), respectively, in comparison with regular bread [54]. Also, the most dominating species of the conventional sourdough microbiota, Lactobacillus sanfranciscensis, has been found to have a favorable impact on several important quality features of sourdough, notably dough rheological qualities, bread texture and aroma, and shelf-life conservation [55][56][103][104][105].
According to [57], LAB mix culture-activated bread samples could tolerate fungal deterioration until the fourth day. It was also discovered that the primary products of LAB fermentation, such as lactic and acetic acid, inhibited further fungal growth in Mucor sp. and Rhizopus sp. by up to 40% and 20%, respectively, when compared to a control bread sample. Also, the development of A. niger was observed in a study by [58][106]. They found that its growth in pan bread containing LAB isolate was slower than the control bread without the isolate after 7 days of baking. Moreover, the antifungal efficacy of Lb. amylovorus DSM19280 as a sourdough starter culture was evaluated by [59]. The result showed that, when it was applied, the bread’s shelf life was increased by 4 days, relative to the control samples, which had mold detectable after only 2 days. Moreover, [60][107] used P. acidilactici KTU05-7, P. pentosaceus KTU05-8, and KTU05-10 strains on sourdough bread in another experiment. Their findings showed that adding sourdough made with these strains in bread decreased fungal deterioration more than control samples and suppressed fungal growth over an 8-day storage period, whereas control bread had visible fungi colonies. Furthermore, to investigate the antifungal activity of Lactobacillus rossiae LB5 and Lb. plantarum LB1, bread slices with Lactobacillus rossiae LB5 and Lb. plantarum LB1 were mixed with Penicillium roqueforti DPPMAF1 by [61][108]. Mycelial development was seen in the wheat germ bread sample after 21 days of inoculation with only a 10% contamination score. In comparison to control samples injected with Cladosporium spp., Aspergillus clavatus, Penicillium roquefortii, or Mortierella spp., [62] studied the implications of using two active propionate providers, Lactobacillus diolivorans and Lactobacillus buchneri, in bread restoration, and discovered that mold development was inhibited for more than 12 days.
Yeast: Numerous authors have experimented with using incompatible yeasts as biocontrol agents. They can be used as bio-preservatives as they retain some of the essential features that enhance their acceptability. They compete for nutrients with fungal pathogens and their higher rate of nutrient utilization significantly contributes to a bio-preservative nature. Yeast produces killer toxins, also called mycotoxins, which showed bioprotective attributes against food spoiling microorganisms and pathogens [109]. Some yeast genera produce extra- and intracellular compounds which possess antibacterial properties. Production of ethanol of high concentration and organic acids which results in the change of pH of the medium also responsible for the effectiveness of yeasts as bio-preservatives [110]. Many of them can sustain residence on dry surfaces due to their low requirements for water and nutrients [63]. With Lb. plantarum 1A7 as a starter, the yeast Wickerhamomyces anomalus LCF1695 (previously recognized as Pichia anomala) was occupied for sourdough fermentation. It was found that when P. roqueforti DPPMAF1 was artificially inoculated (102 conidia ml1) with this combination and stored at room temperature, the microbiological shelf life was elongated to at least 14 days [64]. As well as Penicillium paneum KACC 44834, outgrowth on white pan bread leavened with Penicillium anomala SKM-T was significantly reduced compared to standard baker′s yeast, and improved the shelf life [65]. In contrast, bread composed of propionic acid from cultured yeast extract contained less ethanol and had a better shelf life against mold growth than bread formulated with non-fermented yeast extract [66].

2.2. Plant Extracts as Bio-Preservative

Plant extracts have been extensively studied as bio-preservatives, as plants contain many essential antifungal compounds, for example, phenolic compounds, glucosinolates, cyanogenic glycosides, oxylipins, and alkaloids [111]; there is a thriving interest in natural ingredients with multifunctional properties in food as well. Most edible plant parts include trace amounts of plant defense substances (phenolic acids), categorized as hydroxybenzoic and hydroxycinnamic acids [69]. Hydroxybenzoic acids are frequently found in larger phenolic compounds, such as hydrolyzable tannins. Hydroxycinnamic acids occur as esters of glycerol, tartaric, shikimic, and quinic acids, as well as glycosylated derivatives [70]. Plant extracts can inhibit harmful bacteria from adhering to the host cell membrane. As a result, it reduces bacterial attachment to host cell surface membranes, and thus sometimes it becomes a potential anti-adhesive agent [103].
Study [71] investigated the antifungal efficacy of different raisin extracts and by-products in traditional bread. Compared to a sample containing no preservatives, the bread produced with raisin paste and raisin water separate (7.5%) exhibited the best mold-reducing abilities. Leaf extracts of cherry laurel (Prunus laurocerasus L.) were recommended as potential bio-preservatives after demonstrating a very low MIC (mg/mL) against a variety of bread spoilage fungi [72]. Further, [73] showed that bread produced with a mix of sourdough and pea flour hydrolysate fermented by the antifungal strain Lb. plantarum 1A7 had the most extended shelf life. It is also effective against P. roqueforti DPPMAF1. Moreover, bread formulations containing free or liposome-encapsulated garlic extract (0.65 mL/100 g of dough) were found to be more microbiologically stable than controls, inhibiting molds such as P. herquei, F. graminearum, and A. flavus for five days [12].

2.3. Essential Oil as Bio-Preservative

Plant essential oils are receiving much attention in the food sector because of their potential as decontaminating agents, food flavoring agents, and natural food preservation agents [74]. They are also GRAS (Generally Recognized as Safe) [75]. EOs are formed from the largest category 1-phytoanticipins, intended antimicrobial elements found in plants and applied in the food, pharmaceutical, agronomic, and cosmetic industries [76]. The other categories include (cat. 2) inducible preformed compounds and (cat. 3) phytoalexins, which comprise activated restraining substances when the plant is attacked by a pathogen [77]. These substances can be found in the skins, shells, bark, and cereal bran of fruits, vegetables, and plants [70].
Numerous research has been conducted to figure out the efficacy of essential oils in enhancing the shelf life of bread (Table 2). Carvacrol and eugenol, two antifungal components found in essential oils, could be regarded as powerful antifungal agents. The inner mitochondrial membranes of fungal cells can be largely destroyed, while the cell wall is completely destroyed by them [74]. Thus, essential oils work as antifungal agents. The effects of thyme, clove, cinnamon oils, and orange, sage, and rosemary oils on rotting fungi in rye bread have been examined. Oils of thyme, clove, and cinnamon were known to suppress spoilage fungi, but oils of orange, sage, and rosemary had only a minor impact [78]. Among them, the potential of using marjoram and sage essential oils on bread is neglected owing to their low acceptability in terms of flavor and odor, despite their demonstrated mold inhibiting capabilities [79]. Study [80] used a disc diffusion experiment to study the antifungal effect of several EOs and reported that cinnamon and mustard EOs might cause a 100% inhibition in P. roqueforti multiplication with only 1 µL of EO introduced into the Petri dish system. In comparison, eugenol in cinnamon EO [81] and allyl isothiocyanate in mustard EO are the primary antifungal active components [80]. Furthermore, [82] investigated the antifungal activity of thyme essential oil in par-baked bread (0, 15, and 30 g sourdough/100 g dough) using the macro-dilution method with changed pH (4.8, 5.0, 5.5, and 6.0), aw (0.95 and 0.97), and temperature (22 and 30 °C). Despite thyme oil′s strong in 1vitro potential, there was no noticeable shelf-life expansion for par-baked bread. In the case of rosemary oil, [83] found that applying 50.0 μL/mL rosemary essential oil inhibited both the Penicillium sp. and the Aspergillus sp. fungi tested. After 8 days of preservation at 25 °C, the amount of fungal generation in the dough containing pure oil and the dough containing microencapsulated oil decreased by at least 0.7 and 1.5 log cycles, respectively, in comparison to the control. A study by [84] evaluated essential oils of oregano (Origanum vulgar) and clove bud (Syzygium aromaticum), which were processed using low-speed mixing and ultrasonication to create coarse emulsions (1.3–1.9 μm) and nanoemulsions (180–250 nm). The results showed that both essential oils significantly reduced yeast and mold counts in sliced bread during 15 days. Apart from this, bread was treated with lemongrass EO to the amount of 125 to 4000 μL/Lair where P. expansum generation was inhibited for 21 days at 20 °C [85].
Although using essential oils in the bread industry has many benefits, one major downside is that the consumer does not always appreciate the flavor and aroma they impart. Article [86] documented color changes in food because of essential oils.
Table 2. Preservation of bread by plant essential oils.
Essential Oils Targeted Molds Results Reference
Thyme Aspergillus niger
P. paneum		 No noticeable shelf-life extension [82]
Lemongrass P. expansum Mold growth was inhibited for 21 days [85]
Rosemary Penicillium sp.
Aspergillus sp.		 Fungal generation reduced by 0.7 and 1.5 log cycles after using pure rosemary oil [83]
Clove bud and Oregano A. niger
Penicillium sp.		 Reduced yeast and mold growth for 15 days [84]
Marjoram and clary sage P. chrysogenum
Rhizopus spp.		 Shelf life 8 days [87]
Citrus peel General fungi Shelf life 4 days [88]
Cinnamon and mustard P. roqueforti 100% reduction of the targeted mold growth [80]

2.4. Animal-Derived Products

Cheesemaking generates a waste stream with a high biochemical oxygen demand, whey, which is the liquid fragment produced after milk protein coagulation and is also a contaminant to the environment [89]. In recent times, there has been a gush of attraction in investigating and promoting natural antimicrobial compounds produced from food industry by-products that prevent the production of fungi in food [63]. The antimicrobial or antifungal compounds cause target cell membranes to permeabilize, resulting in holes, cell leakage, and cell death [108]. This two-pronged strategy addresses the health problems accompanied by chemical food additives by redressing them with natural preservatives, thereby encouraging better food items and contributing to the prevention and reduction of food waste [90][91]. Whey can be an intriguing technique for bread bio-preservation. A study conducted by [92] exhibited that whey’s application as a bio-preservation agent in bread improved shelf life by almost 2 to 15 days compared to bread that contained 0.3% calcium propionate and controlled untreated bread. Bread produced with goat whey hydrolysate (HGW) and treated with toxigenic fungi was included in a shelf life study by [93]. This study determined the effect of calcium propionate on fungal growth and mycotoxin formation in bread. It was proven that bread containing HGW inhibited fungal growth, with minimal inhibitory and fungicidal concentrations of 3.9–62.5 and 15.8–250 g HGW/L, respectively. In addition, HGW showed a 1-log reduction in fungal production, 85–100% mycotoxin generation, and a 2-day shelf life extension.

2.5. Nanoparticles

Efforts to provide effective bioactive packaging action and to prevent most biopreservatives from degradation under harsh conditions, including high temperatures and high humidity, may improve bakery products by implementing nanotechnology into the food business, specifically by incorporating nanomaterials [35].
Diseta et al. [94] carried out a recent experiment to assess the antifungal efficacy of nanocomplexes based on egg white protein nanoparticles (EWPn) and carvacrol (CAR), bioactive compounds (BC), trans-cinnamaldehyde (CIN), and thymol (THY), as well as their use as edible coatings on preservative-free bread. It was found that EWPn-CAR and EWPn-THY nanocomplex coatings had higher antifungal efficacy, allowing the bread to last an additional 7 days after application. Another study by [35] evaluated starch/carvacrol nanofibers where nanofibers containing 30 or 40% carvacrol showed restriction zones with limited generation and were successful in suppressing both fungi tested in the study. Besides the fact, only bread evaluated with starch/carvacrol nonwovens with 30% carvacrol had lower CFU values and no fungal development after 7 days (0 CFU). As well, incorporating nanomaterials into chitosan-based food wrapping techniques can help to inhibit spoilage and pathogenic microorganism generation, enhance food quality and safety, and lengthen the food shelf life. Based on the findings of study [95], it appears that chitosan-based films, coatings (or treatment) have been applied to prolong the shelf life of fresh produce, meat, bread, and dairy products. It could be a novel food packing system [96]. More recently, [97] studied the potential of expanding the shelf life of white bread by employing paper packages modified with Au/TiO2, Ag/N-TiO2, and Ag/TiO2-SiO2. They discovered that packaging with Ag/N-TiO2, and Ag/TiO2-SiO2 paper prolonged the shelf life of bread by 2 days, while utilizing Au/TiO2 paper had no effect.
However, though nanoparticle-based packaging materials are increasing its wide acceptance, there are still possibilities of migrating nanoparticles from packaging materials to foodstuff. Considering human health effects, it is also essential to consider short- and long-term toxicity studies. Nevertheless, it is not so easy to predict the NPs’ mode of action due to their vast range of physicochemical and biological behaviors [105]. Different countries are taking several robust regulatory approaches to cover all these issues. In the US, FDA (Food and Drug Admininstration) looks into the size of the NPs ranging from 1 nm to 100 nm, external dimension(s) (up to 1 µm), properties, etc. [106]. Even in Europe, stakeholders are demanding for greater transparency by either the labeling of products containing NPs or making use of nanotechnology [107].

2.6. Other Novel Technologies

Dispersion from the wrapping material to the food surface is a significant issue when it comes to the choosing and employment of plastic packaging substances for food packaging (2002/72/EC) [98]. The initial purpose of food packaging is to denounce the reactions that deal with the durability of the contents enclosed. Also, effective packaging selection and optimization are critical for food manufacturers.
Nowadays, various packaging materials with varying barrier qualities are available for food packaging, making the problem of selecting the best packaging material for a specific food product more challenging than ever.The researchers will be discussing a few novel technologies of bread preservation below.
The existing packaging materials serve as a barrier to protect the bread from an adverse environment and any spoilage. Among several novel technologies for bread preservation, active packaging can either increase or observe the shelf life by actively interacting with it, which usually necessitates the application of chemical compounds [99]. Active packaging methods reduce bread spoilage by utilizing ethanol emitters, essential oil, and oxygen absorbers with other antimicrobial factors as a coating in the packaging or edible films, or by inserting them into the packaging, for example, as sachets [111][99]. They offer several benefits, along with the capacity to control the inner conditions of the package headspace, the partial or total distribution of other chemical preservatives, as well as the expansion of mold-free shelf life and the conservation of good sensory attributes for more extended periods, allowing for faster stock rotation cycle times and the extension of the distribution channel for bread item distributors [11]. Moreover, [100] studied the influence of active packaging with a cinnamon essential oil label mixed with MAP on the shelf life of gluten-free sliced bread in 2011. They discovered that active packaging extended the shelf life of packed food while retaining the gluten-free bread’s sensory qualities.
The rising consumer concern about food preservatives is prompting an expansion in demand for preservative-free goods. Modified Atmosphere Packaging is a substitute to chemical preservatives for governing mold decomposition in bread items, aside from their aw and pH, which is described as the process of enclosing a food item in a high gas resistance film with the gaseous environment altered or regulated to reduce respiration rate, lower microbiological development, and hinder enzymatic decomposition to extend shelf life [101]. This mechanism involves injecting nitrogen (N2) and carbon dioxide (CO2) into the environment where the food packaging is placed. These gases are generally incorporated to appreciate the shelf life of bakery items by preventing fungal growth [98]. To determine which gases are the most successful in maintaining freshness, [102] compared the shelf life of bread prepared and conserved under varying concentrations of gases. They found out that the combination of 50% CO2 and 50% N2, with and without calcium propionate, was most dynamic against mold and yeast growth, increasing the shelf life to 117% and 158% at 22–25 °C and 15–20 °C, respectively.

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