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Polyphenols and its Natural Preservatives
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This entry is adapted from the peer-reviewed paper 10.3390/ma16134793

The use of synthetic/artificial preservatives has become common and has not been widely accepted by consumers as they are aware of the fact that exposure to preservatives can lead to adverse effects on health, which is a major area of concern for researchers. Naturally occurring phenolic compounds appear to be extensively used as bio-preservatives to prolong the shelf life of the finished product. 

natural phenolic compounds preservatives antioxidant microbial activities

1. Introduction

Shelf life refers to the duration between manufacturing and expiry date, during which the product is expected to retain its original characteristics and remain acceptable for consumers as far as its quality is concerned. During this duration, the product is susceptible to chemical, biological, and physical deterioration, which ultimately degrade the qualitative characteristics of the product [1]. Therefore, preservatives have been extensively used in various pharmaceuticals, cosmetics, and food products to prevent them from deterioration [2][3]. Many factors are responsible for governing the mean life of the product such as the growth of microorganisms, heating, inappropriate temperature, long storage, change in moisture content, reaction with light and oxygen, fermentation, acidification, enzymatic changes, etc., which result in the loss of important properties of the finished product. Pharmaceutical preparation consists of a diverse range of structures and moieties that are susceptible to deterioration. Deterioration is the result of chemical reactions that occur between the various ingredients present in the formulation and the external environment. The deterioration of a product generally occurs during longer storage, affecting its stability, ultimately resulting in the product’s decline in its intended natural quality due to microbial contamination and rendering the product harmful to the consumer. In general, there are three processes by which the product degrades [4]. Chemical breakdown includes chemical incompatibilities, such as hydrolysis, oxidation, photolysis, polymerization, hydration, dehydration, and decarboxylation [5][6]. A change in temperature, particle size, evaporation, vaporization, efflorescence, hygroscope, deliquescence, etc. are all examples of physical degradation. Everywhere we look, there are microbes that assault the product once it is opened. The product starts losing its quality quickly on a microbiological level [7].

2. Preservatives and Their Needs

An antimicrobial preservative is a natural or artificial substance added to non-sterile products in favor of preventing their decomposition due to chemical, enzymatic, or microbial activities or any undesirable chemical changes, most probably caused by microbial growth and lipid oxidation [8][9] (Figure 1). The addition of preservatives is obligatory in the case of products containing water, or organic or inorganic compounds that are at the highest risk of contamination. Products such as creams, solutions, emulsions, suspensions, parental and eye drops, etc. are likely to be perishable, which may further lead to the spoilage of products and result in the loss of some essential properties [10][11]. Therefore, preservatives are meant to be introduced during the manufacturing process to keep the essential qualitative characteristics and organoleptic properties of the product intact by retarding degradation of the product formulation during its shelf life [12]. They keep the product fresher for a longer time so that no undesirable pathogen could attack and bring about unenviable changes in the finished product.
Figure 1. Causes of deterioration of the product.

3. Food Preservatives

Foodstuffs of various types such as raw food, junk food, fast food, organic food, whole food, processed or unprocessed food, and vegetarian or non-vegetarian food exist across the globe depending upon climatic and geographical conditions. Moreover, foodstuffs are subjected to storage in go downs or houses for handling emergencies [13]. Food products are perishable items with a short shelf life ranging from a few hours to a few days to a few months. For many years, food preservation has been a great challenge for the food industry in terms of ensuring quality, nutritional value, organoleptic properties, and safety [14][15]. Preservatives are generally added to decontaminate the food product and to ensure the stability and safety of the product. The consumer demands chemical-free, fresh, nutritionally rich, tasty, smells good, and ready-to-eat food, which appeals to the taste buds and has a prolonged shelf life too. This has prompted researchers/manufacturers to search and develop natural antimicrobial preservatives. Organic acids and their derivatives depicted in Table 1 are natural compounds that have been exploited by researchers as bio-preservatives for the last few decades. They are found to be inexpensive and effective at decontaminating the food product against the population of food pathogens and are generally recognized as safe (GRAS). Several studies reported that organic acids such as acetic, citric, lactic, propionic, benzoic, and sorbic acids possess an excellent antimicrobial potential, exhibiting a broad spectrum of activity against food pathogens such as bacteria fungi and yeast [16][17][18][19].
Table 1. List of existing food preservatives and their problems.
Table
Preservatives & Chemical
Structure		 Toxic Effect Food Products References
Materials 16 04793 i029
Acetic acid		 Breathing difficulty, swelling, irritation Preserved fish, preserved meat, cooking oil, curry powder, processed cheese, instant puddings, butter, bread, mozzarella cheese, baby food, etc. [20][21]
Materials 16 04793 i030
Ascorbic acid (Vitamin C)		 Nausea, vomiting, headache, heartburn and cramps Fruit juices, jams, beer, soft drinks, cider, cereals, canned tuna, glaze for frozen fish, etc. [22]
Materials 16 04793 i031
Benzoic acid		 Carcinogenic, irritation, metabolic acidosis, asthma, convulsions, etc. Fruit juices, soft drinks, coffee extracts, pickles; pineapple marmalade with pectin; relishes; tomato paste; tomato pulp; tomato puree, etc. [23][24][25]
Materials 16 04793 i032
Sodium benzoate		 Allergy, asthma, skin rashes, hyperactivity, liver cirrhosis, Parkinson’s disease, etc. Chayavanprash, fruit juices, fruit cocktails, tomato ketchup, pasta sauce, milk products, jams, soft drinks, salad dressings, pickles, margarine, etc. [23][24][25][26]
Materials 16 04793 i033
Citric acid		 Numbness, rapid weight gain, cramps, mood changes, severe stomach pain, diarrhea and convulsions, etc. Fruit juices, soft drinks, meat, frozen food, chips, biscuits, ice creams, soda, wine, etc. [27]
Materials 16 04793 i034
Formic acid		 Nausea, vomiting, dizziness, headache, skin allergy etc. Livestock feed [28]
Materials 16 04793 i035
Lactic acid		 Brain fog, gas, and bloating Yoghurt, olives, cucumber pickles, salad dressing, cheese, frozen desserts, soda, etc. [29]
Materials 16 04793 i036
Potassium lactate		 Brain fog, gas, and bloating Meat and poultry products [29][30][31][32]
Materials 16 04793 i037
Propionic acid		 Corrosive, increase resistance to glucagon, norepinephrine, and insulin Bakery products, gelatin, milk, and milk products such as cheese, yoghurt, etc. [26][33]
Materials 16 04793 i038
Sorbic acid		 Contact dermatitis and urticarial, etc. Fruit juice, wine, jams, jellies, margarine, meat products, cakes, sauces, processed cheese, salads, etc. [26]
Materials 16 04793 i039
Potassium Sorbate		 Contact dermatitis and urticarial, etc. Karela amla juice, Amla-Aloe vera juice with wheatgrass, milk products, etc. [26]
Materials 16 04793 i040
Sulphur dioxide/Sulphites
Materials 16 04793 i041
Potassium bisulfate		 Allergic reactions
(nausea, skin irritation, asthma, eczema, diarrhea)		 Fruit juices, cider, wines, meat products, sausages, sweets, jams, jellies, glucose syrups, dry biscuits, dry mix of rasogollas, refined sugar, misri, jaggery, glucose syrup, potatoes, beverages, raisins, pickles, chutneys, etc. [26]
Nitrites & Nitrates
(Sodium & Potassium)		 Genotoxicity, carcinogenic (stomach and pancreatic cancer) Meat products, hot dog, smoked fish, and many others [26][34]
Materials 16 04793 i042
BHA   BHT		 Endocrine disruptors, neurological problems, metabolic dysfunction, behavioral issues, and may cause cancer Hot dogs, meat, potato chips, chewing gum, vegetable oils, bread, breakfast cereals, and many others [35]
Materials 16 04793 i043
Triclosan		 Antibiotic resistance in bacteria, endocrine disruptor, skin sensitization, neuro-toxicity, reproductive and developmental toxicity, genotoxicity, carcinogenicity, phototoxicity, etc. Active food packaging [35][36][37]
Nisin Nausea, pruritus, skin rash and vomiting, etc. Prepacked coconut water, canned rasgulla, baking mixes containing egg, etc. [38]
Dehyderoacetic acid (DHA) Allergic contact dermatitis Cheese, meat products, squash, etc. [39]
Materials 16 04793 i044
Erythorbic acid		 Hypersensitivity, nausea, vomiting, headache, diarrhea, heartburn, and cramps Meat, frozen fruits and vegetables, beverages such as soft drinks, fruit juice, grape wine, beer, etc. [40]
Materials 16 04793 i045
Dimethyl dicarbonate (DMDC)		 Carcinogenic Non-alcoholic beverages such as sports drinks, energy drinks and non-carbonated drinks such as ice tea, etc. [41][42][43]

4. Natural Preservatives and Their Importance

Owing to their natural origin, bio-preservatives received lots of attention in recent years as they are much safer and more beneficial when compared to synthetic preservatives. Natural food preservatives are typically of plant, animal, and microbial origin. Natural products, derived from natural plant sources such as herbs, spices, and essential oils, are widely used to give aroma to beverages and mask the disagreeable odor of the constituents in addition to their preservative action (Figure 2) [44]. They are found to increase shelf life naturally by decreasing lipid oxidation. Some of the common conventional methods that can be used to preserve food are drying (natural and artificial), pickling (using salt or vinegar), freezing, high-pressure processing, and the edible coating technique [45].
Figure 2. Natural products derived from plants.
Plant phenols are divided into different classes, including simple phenols, phenolic acids, anthocyanins, stilbenes, flavonoids, tannins, lignans, and lignins (Figure 5). Phenolic acids are aromatic secondary plant metabolites that are extensively spread across the plant kingdom. [46]. Currently, there is much scientific interest in their potential protective role against oxidative stress-related diseases. The main edible sources of phenolic acids are fruits, vegetables, cereals, seeds, berries, beverages, olives, and aromatic plants, and they can be found in almost all parts of the plant [47][48]. They occur in the form of esters, glycosides, and amides but rarely in the free form [49]. Despite their origin, these versatile molecules have been reported to possess a wider canvas of biological activities such as antioxidant, antibacterial, antifungal, antiviral, anticancer, anti-inflammatory, anti-diabetic, insecticidal, estrogenic, and keratolytic activities, and many more [50][51][52]. Phenolic compounds are well known for their antioxidant potential and have been extensively used as bio-preservatives to elongate their shelf life, besides their other well-established health benefits. Phenolic acids are non-flavonoid polyphenols that contain a carboxyl group with one or more hydroxyl groups linked to a benzene ring [53][54]. Phenolic acids are known to possess two distinctive carbon frameworks: hydroxybenzoic acid (benzoic acid derivatives) and hydroxycinnamic acid (cinnamic acid derivatives). In these two carbon frameworks, even though the fundamental frame remains the same, the structural variation in the numbers and orientation of hydroxyl groups on the aromatic ring results in a variety of potential derivatives. Hydroxybenzoic acids with seven carbon atoms have a general structure of C6-C1 derived directly from benzoic acid and are present in foods in glucoside form. Some common hydroxybenzoic acids are protocatechuic acid, vanillic acid, syringic acid, and gallic acid. Hydroxycinnamic acids are natural phenylpropanoids having a general structure of C6-C3 derived directly from cinnamic acid and are mostly present in the bound form. Among hydroxycinnamic acids, sinapic acid, caffeic acid, ferulic acid, and p-coumaric acid are the most abundant compounds in foods [55][56] (Figure 3). In both these derivatives, the variation lies in their hydroxylation and methylation patterns in aromatic rings.
 
Figure 3. Natural phenolic antioxidants.
Structure–activity relationship (SAR) studies of phenolic acids reveal that the reactivity of the phenol moiety imparts antioxidant activity to a greater extent but can also be affected by some other parameters such as the chemical structure, number, position of hydroxyl groups, substituents on the phenolic ring, and esterification of the carboxyl group. They act as reducing agents, hydrogen donors, and oxygen suppressants when added to food products (Figure 4). They also can inhibit the enzymes involved in radical generation and act as free radical scavengers [57][58]. In general, they are used to prolong the shelf life by preventing oxidative rancidity, degradation, discoloration, contamination, and any other undesirable changes from occurring. Because of their presence in natural plant-based foods and their role as dietary antioxidants, along with radical scavenging abilities, they have received a lot of attention from researchers worldwide [46][59].
Figure 4. Biosynthesis of phenolic compounds with excellent antioxidant activity.

4.1. Natural Plant Constituents as Antimicrobial/Antioxidants

Antimicrobial agents derived from natural sources have been recognized and used anciently in preservation [60]. The importance of natural sources as antimicrobials/antioxidants is well established and this allows them to be selected as potential candidates for novel preservatives (Table 2 and Figure 5).
Figure 5. Phenolic acids and their natural sources.
Table 2. List of some phenolic acids and their reported biological activities.
Table
Natural Sources Phenolic Content with Antioxidant/Antimicrobial Activity References
Allium cepa Protocatechuic acid [61]
Ananas comosus Coumaric acid and ferulic acid [62]
Berries Hydroxycinnamic and hydroxybenzoic acids [63][64][65]
Coffea arabica Hydroxycinammic acids [64]
Daucus carota p-Coumaric, chlorogenic, and caffeic acids [66][67]
Emblica officinalis 1,8-Cineole [68][69]
Fagopyrum esculentum Rutin, quercetin, and catechins [70][71][72]
Glycine max Protocatechuic acid, p-hydroxybenzoic acids, chlorogenic acid, etc. [73]
Malus domestica Coumaric acid, catechin, epicatechin, chlorogenic acid, procyanidin and gallic acid, etc. [74]
Mangifera indica Myricetin, chlorogenic acid, kaempferol, gallic acid, sinapic acid, and ferulic acid [75]
Mushroom species p-Hydroxybenzoic, protocatechuic, gallic, vanillic, coumaric, syringic, gentisic, ferulic, cinnamic, caffeic acids [76]
Origanum vulgare Rosmarinic acid [77]
Oryza sativa Protocatechuic acid [78]
Psidium guajava Chlorogenic Acid, gallic acid, Kaempferol, sinapic acid, and myricetin [75]
Punica granatum Quercetin, kaempferol, luteolin, and
Myricetin, etc.		 [79]
Salvia rosmarinus Rosmarinic acid, carnosol, and carnosic acid [77]
Syzygium cumini Quercetin [80][81][82]
Thymus vulgaris Caffeic and rosmarinic acids [83]
Triticum aestivum Phytic acid, ferulic acid, sinapic, syringic, vanillic and p-coumaric acids [84][85]
Vitis vinifera Malvidin, cyanidin, delphinidin, peonidin and petunidin, epigallocatechin etc. [86][87]

4.2. Applications of Phenolic Antioxidant/Antimicrobials

Over the last years, naturally occurring fruits, vegetables, herbs, spices, oils, and their extracts attract the attention of researchers as they are regarded as the ultimate sources of phenolic compounds. They have been tremendously utilized/applied by the food, cosmetics, and pharma industries for a better therapeutic efficacy and conservation of substances. Moreover, they are broadly available, reliable, and cheap with minimal toxic effects, which makes them superior to synthetic products in all aspects. Various applications of polyphenolic compounds [88][89][90][91][92][93] in the pharmaceutical, food, and cosmetics sectors have been summarized in Figure 3.
Figure 3. Applications of polyphenolic compounds in different sectors.

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Subjects: Biochemistry & Molecular Biology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Priyanka Rathee
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Renu Sehrawat
,
Pooja Rathee
,
Anurag Khatkar
,
Esra Küpeli Akkol
,
Sarita Khatkar
,
Neelam Redhu
,
Gizem Türkcanoğlu
,
Eduardo Sobarzo-Sánchez
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Revisions: 2 times (View History)
Update Date: 07 Oct 2023
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