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Fruit By-Products and Their Industrial Applications for Nutritional Benefits and Health Promotion: A Comprehensive Review

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Submitted:

24 February 2023

Posted:

28 February 2023

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Abstract
Fruits are commonly used, fresh or processed, to prepare different industrial products with superior nutritional and health-promoting properties. Currently, the demand for processed fruit products has motivated the rapid growth of the fruit processing industries, persuading them to produce an enormous amount of by-products with less utilization. Furthermore, people's shifting dietary habits and lack of awareness of nutritional properties result in an avoidable load of fruit by-products. The knowledge of the value of by-products urges exploration with proper documentation, emphasizing the health benefits of some such products. Hence, this review is prepared by carefully analyzing the recent literature on industrial applications of fruit by-products and their nutritional and health-promoting properties. The use of fruit by-products in food industries for various purposes has been reported in the past and has been reviewed and described here. Fruit by-products are a good source of nutrients and bioactive components, including polyphenols, dietary fibers, and vitamins, implying that they could have an important role for novel, value-added functional food properties. Furthermore, fruit by-products are used as the substrate for the production of organic acids, essential oils, enzymes, fuel, biodegradable packaging materials, and preservatives.
Keywords: 
Subject: Chemistry and Materials Science  -   Food Chemistry

1. Introduction

According to the Food and Agriculture Organization (FAO), there is a shift in consumers’ demand from processed foods to natural foods of superior quality that meet their nutritional requirements while promoting health [1]. Fruits and vegetables are rich in nutritional value and often promote human health. Fruits and vegetables are packed with vitamins, antioxidants, minerals, and dietary fiber. Citrus, watermelon, banana, apple, grape, and mango are the most popular fruits produced in the world [2]. The global production statistics include 124.8 million metric tons (MMT) of citrus, 114.1 MMT of bananas, 84.6 MMT of apples, 74.5 MMT of grapes, 45.2 MMT of mangoes, and 25.4 MMT of pineapples [2].
Even though fruit production statistics show an annual increase, it is still insufficient to meet consumption demand. Increasing global population, as well as a lack of production and supply chain obstacles, frequently necessitates the development of new innovative technologies to meet demand in the near future [3]. According to FAO, over 821 million people are currently malnourished due to a scarcity of staple foods such as starchy cereals, roots, and tuber crops [2]. This created a shift from conventional plant-based diets to other substitute food products, including the by-products of fruits and vegetables.
Furthermore, a recent report [4] revealed that over 1.3 billion tons of foods are wasted each year [5]. Despite the reduction in fruit and vegetable waste globally (from 60% in 2011 to 45% in 2015), there is still a need for an improvement in bio-waste utilization [5,6]. Fruit waste and scrapped value are affected by the type of fruit, processing methods, and post-harvest technologies. For example, the discarded portion for bananas is 35% [7], pineapples are 33–46% [8], papaya is 15–20% [9], mango is 25–40% [10], citrus is 25–35%, apple is 9–13%, and watermelon is 43–48% [11,12].
Fruits are commonly used fresh and processed into juice, frozen fruit pulps, jam, syrup, and concentrated or dehydrated forms [13]. An enormous amount of waste is generated during fruit processing, and proper disposal is associated with higher operational and transportation costs. Thus, imprudent disposal has negative impacts on both the economy and the environment. Likewise, the wastes generated from fruit processing have environmental risks but also represent an enormous loss of nutrients with high bioactive properties [14]. Fruit by-products including skins, cores, stems, shells, stones, and seeds, account for 50–60% of fresh fruit. In most cases, nutritional comparison shows that the by-products, including peel and seeds, have higher nutritional values as compared to the pulp [15]. Additionally, fruit by-products such as skins are natural sources of soluble and insoluble dietary fiber, pectin, and phenolic antioxidants [16,17]. The therapeutic properties of these by-products offer a high potential for further value while assisting in the prevention of non-communicable diseases such as diabetes, cardiovascular disease, obesity, and cancer [18,19,20]. Through the process of valorization, promising potentials of by-product utilizations in the food, pharmaceutical, biotechnology, and related industries may inspire the food, pharmaceutical, biotechnology, and related industries in the near future.

2. Materials and Methods

A mixed-method approach involving the collection of quantitative and qualitative research findings was used to optimistically analyze the potentials of fruit by-products from existing literature. This approach included identification of published literature indexed in Google Scholar®, Scopus®, Web of Science®, Springer Link, Science Direct, PubMed, and MDPI databases using the following keywords: bio-active components, biotechnological techniques, fruit processing, waste utilization, fruit wastes and by-products, and industrial waste. As some keywords gave a very large number of published articles with a scope far different from the scope of this review, more restricted terms like "bioactive compounds from fruit by-products," "biotechnological techniques of fruit by-product valorizations," "banana by-product," "avocado by-product," "apple by-product," "citrus by-product," and "watermelon by-product" were used. Articles published between 2000 and June 2020 were selected for this review.

3. Description of Some Common Fruit by-Products: Overview

3.1. Banana (Musa spp.) by-Products

Banana, grown in tropical and subtropical biospheres, is a prominent fruit crop consumed throughout the world. The banana fruit is available year-round at a fair price [21]. Banana processing generates lots of industrial by-products such as peels, rhizomes, stems, leaves, sheaths, and inflorescence [22]. These by-products are useful resources for various industrial applications, including in the food and medicine manufacturing industries, due to the rich phenolic composition of the peel [23].

3.2. Apple (Malus Domestica Borkh.) by-Products

Apple is among the widely cultivated temperate fruits with pleasing taste, aroma, and health-enhancing substances [24]. Nearly 68% of apples are consumed raw, and the remaining is industrially processed for juice, cider, and powder, generating various by-products such as seed, peel, core, and stem using microwave-assisted phosphoric acid activation [25]. The apple by-products, including seeds and peels, represent roughly 25–30% of the load of the first fresh fruit [26] and are used as ingredients in food formulation [27].

3.3. Mango (Mangifera Indica L.) by-Products

Mango is a popular tropical fruit with very extensive production. It is called "the king of fruits" because of its luscious flavor, pleasing aroma, and nutritional value [28]. Mango fruits have bio-functional properties and are commonly consumed as fresh, frozen, juice, jam, or nectar [29]. Processing mango fruit into different value-added products has immense waste products that range from 40 to 60% of by-products based on variety and size, of which peels represent 12–16%, seeds 10–25%, and kernels 15–20% [30].
Mango peels are the main by-products generated from industrial processing and fresh consumption and account for 10–20% of the total weight of the mango fruit [31]. Recently, mango peels have gained attention from the scientific community because of their high content of bioactive compounds such as polyphenols, catechins, kaempferol, gallic acid, mangiferin, quercetin, and benzoic acid with functional and health properties [32,33]. Mango seeds and kernels are also additional by-products obtained during the industrial processing of mango.

3.4. Citrus (Citrus Rutaceae L.) by-Products

Citrus fruit belongs to the Rutaceae families, which include fruits like oranges, tangerines, mandarins, lemons, limes, sour oranges, and grapefruits. Citrus is among the most widely consumed fruits around the world [34]. Citrus fruits are so-called "fleshy" fruits with lofty amounts of citric acid, which gives them an acidic taste. Industrially, citrus fruits are processed into juice, jam, marmalade, fruit cocktail, and flavoring agents [35,36].
During processing of citrus fruits, 1–10% of the seed, 60–65% of the peel (flavedo and albedo), and 30–35% of internal tissues (juice sac residues and rag), representing 50–70% of the processed fruit depending upon the variety, processing methods, and growth conditions, were discarded from the total generated by-products [37]. Citrus peel is also dried and mixed with pulp to produce molasses for cattle feed.

3.5. Grape (Vitis Vinifera) by-Products

Grape is a common fruit that is consumed almost everywhere in the world [2]. Approximately 50% of the world's production of grapes goes into winemaking or vinification, and the remaining 50% is consumed fresh or dried to make grape raisins [38]. The main byproducts of wine processing are pomace (skins, stems, and residual pulp) and grape seed, which accounts for nearly 20% of the original grape weight [39]. The grape seeds account for about 5% of the total weight of the whole grape; they account for almost 40%–50%, and the pomace accounts for 10–15% of the discarded solid residues from the wine processing industries [40].

3.6. Avocado (Persea Americana) by-Products

Avocado is the most important fruit cultivated in tropical and subtropical regions of the world, where one-third of the production is handled by Mexico [41]. Avocado is considered a butter pear due to its shape and the soft texture of its pulp. Avocado fruit contains vitamins (B-vitamins, vitamin K, vitamin E, and vitamin C), minerals (potassium, copper), proteins, fibers, phenolic acids, hydroxycinnamic acids, and essential fatty acids (UFA), all of which have substantial health benefits [42]. During industrial processing of avocados into oils, the remaining residues, such as seeds and peels, representing 21–30% of the fruit are discarded [43].

3.7. Pineapple (Ananas Comosus L.) by-Products

Pineapple is a tropical fruit grown in several parts of the globe, with Thailand, Brazil, the Philippines, Costa Rica, and India being the main producers. Asia is the main continent producing pineapples (48.2%), followed by America (34.5%), and Africa (16.4%) [2]. Pineapple is commonly consumed fresh and used in salads and is commercially available in juice forms, jams, dehydrated products, and canned foods. Pineapple is added to various types of fruit concentrates because of its neutral color, pleasant flavor, and good acidity/sweetness ratios [44].
Processing of pineapple into value-added products generates different by-products, such as residual pulp, peels, stems, and a core, which represent 35–46% of discarded residues [8]. Peels have the highest percentages of by-products, ranging from 30% to 42% w/w, followed by a core at around 10% w/w. Core and stem share 5% by weight of the total waste. Almost half of the total pineapples produced are discarded, along with plenty of bioactive compounds [44].

4. Nutritional Potentials of Fruit by-Products

Fruit by-products, including peel, skin, seeds, pomace, and stones, contain a high amount of bioactive compounds and are good sources of nutrients, including pectin, proteins, fat, fiber, minerals, and vitamins. This section briefly explains the nutritional composition as well as the bioactive compounds found in fruit by-products. Proximate composition, mineral content, vitamin composition, and bioactive compounds extracted from fruit by-products are summarized in Table 1, Table 2, Table 3 and Table 4, respectively. Table 5, Table 6 and Table 7 summarize industrial applications of fruit by-products.

4.1. Banana Fruit

Banana peels represent 30–40% of the edible part of the fruit and are a rich source of phytochemicals such as phenolic compounds, dietary fibers, and carotenoids that are known to have high antioxidant capacity [45]. Banana pulp and peel flour also contain many other phytochemicals, such as catecholamines, flavonoids, phenols, steroids, phytosterols, glycosides, and terpenoids [46]. Additionally, banana peel has macro-minerals (potassium, calcium, phosphorus, and magnesium), trace minerals (iron and zinc), and vitamins (vitamins C and A) [47]. The fiber content of the peel is approximately 50%, and it is a rich source of pectin, which forms gels used as an emulsifier [48]. The nutrient components, including proximate (Table 1), mineral (Table 2), and vitamin (Table 3) contents, are presented and discussed. Bioactive compounds of banana by-products are presented in Table 4 and Table 5 and have applications in different industries.

4.2. Apple Fruit

Apple pomace is a rich source of beneficial bioactive compounds, including phenolic acids, flavonoids, and dihydrochalcones [49]. Apart from the minor components, apple pomace is also a good source of carbohydrates, proteins, vitamins, and minerals (Table 4). The pomace consists mainly of insoluble sugars, including cellulose, hemicellulose, and lignin (a non-starch polysaccharide), with simple sugars such as glucose, fructose, and galactose [50]. It also contains minerals such as phosphorus, calcium, magnesium, and iron. Additionally, apple pomace contains fatty acids, including linoleic acid (18:2 n-6) and oleic acid (18:1 n-9) [51]. The proximate, mineral, and vitamin contents are presented in Table 1, Table 2 and Table 3, respectively. Bioactive compounds of banana by-products are presented in Table 4 and Table 5 and have applications in different industries.
Table 2. Mineral content (mg/100 g) of some common fruit by-products.
Table 2. Mineral content (mg/100 g) of some common fruit by-products.
By-product Phosphorus Potassium Calcium Sodium Magnesium Iron Zinc Copper Manganese Reference
Apple pomace 64.9–70.4 398.4–880.2 55.6–92.7 185.3 18.5–333.5 2.9–3.5 1.4 0.1 0.4–0.8 [51]
Mango seed kernel 20 158 10.21 2.7 22.4 1-12 1.1-5.6 8.6 0.04 [63]
Banana peel - 4599.7 2011.5 32.5 95.1 2.5 2.3 12.4 5.7
[65]
Avocado peel - 899.8 679.3 21.1 46.9 2.3 1.6 14.5 1.4
Avocado seed - 1202.6 434.9 39.4 55.8 3.7 1.8 16.7 1.5
Citrus peel 366.84 8.75 515.78 274.77 5.39 9.06 - - - [67]
Pineapple peel 1349.5 4236.2 9.8 107.6 1.6 0.8 4.7c 8.2 [65]
Grape pomace 193 4334 182 131 - - - - - [68]

4.3. Mango Fruit

Mango by-products are important sources of bioactive compounds, including vitamin C, beta-carotene, polyphenols, and dietary fiber [52]. Mango seed kernels are used for making multi-purpose nutraceuticals owing to their high composition of phytochemicals like phenolic acids, flavonoids, catechins, hydrolyzable tannins, and xanthanoids [29,30]. Mango seed kernel powder contains a good amount of fat, protein, and carbohydrate, which implies a possibility to produce energy-rich functional foods from this resource [53]. Besides, mango peel is an excellent source of dietary fiber (45 to 78%) and other components such as phenolic acids, flavonoids, xanthones, carotenoids, ascorbic acid, and tocopherols [54]. The proximate, mineral, and vitamin contents are presented in Table 1, Table 2 and Table 3. Bioactive compounds of mango by-products are presented in Table 4, and Table 5, Table 6 and Table 7 have their applications in different industries.

4.4. Citrus Fruit

Among the generated wastes, 60–65% comes from the peel, 30–35% from interior tissues, and 0–10% from seeds [55], which provide a valuable source of phytochemicals with high antioxidant activity, anti-inflammatory properties, and anti-cancer properties compared with the edible portion [56]. The proximate, mineral, and vitamin contents are presented in Table 1, Table 2 and Table 3. Table 4 lists the major bioactive compounds found in citrus byproducts.

4.5. Grapes

Wine processing by-products have various types of biomolecules (dietary fibers, lipids, proteins, and natural antioxidants and phenolic compounds) and are a cheap source for the development of dietary supplements [57]. Grape seed is one of the major by-products with dense bioactive components, including stilbene, resveratrol, gallic acid, rutin, and catechinalate. These bioactive compounds exhibit cardiovascular-protective, anti-microbial, antioxidant, and anti-cancer properties [58].

4.6. Avocado Fruits

Fresh avocado peel is a potential source of carbohydrates (60–73%), proteins (3–8%), lipids (4–9%), fiber (about 50%), and ash (3–6%). Similar to the peel, the avocado seed also consists of 72% carbohydrates, 4.5% proteins, 4.6% lipids, 3.8% fiber, and 3% ash [59]. Avocado peel and seed are also high in phytochemicals such as phenolic acids, condensed tannins, and flavonoids [60]. These bioactive compounds have been shown to exhibit antioxidant and anti-inflammatory properties. Furthermore, avocado byproducts have numerous applications in different industries, as shown in Table 5, Table 6 and Table 7.

4.7. Pineapple

Pineapple by-products are cheap sources of dietary fiber, which may be applied for the production of fiber-rich foods [61]. Pineapple by-products are also used as a substrate for the production of organic acids, with great commercial demand for acidification and flavor-enhancing of low-acid foods, including most fresh vegetables and fruits [62]. The proximate, mineral, and vitamin content are presented in Table 1, Table 2 and Table 3. Table 4 shows the bioactive compounds of pineapple by-products, and their utilization in different industries is summarized in Table 5, Table 6 and Table 7.
Table 3. Vitamin content of some common fruit by-products in (mg/100 g).
Table 3. Vitamin content of some common fruit by-products in (mg/100 g).
Vitamin (mg/100g) Fruit by-products
Citrus peel Mango seed Avocado seed Pineapple stem Grape pomace Pineapple peel
Vitamin B1 11.9 0.08 0.33 - - -
Vitamin B2 - 0.03 0.29 - - -
Vitamin B3 234.16 - 0.06 - - -
Vitamin B6
286.63 0.19 - - -
Vitamin B9 1.36 - - - - -
Vitamin B12
- 0.12 - - - -
Vitamin C 21.34 0.56 97.8 121.2 26.25 212.9
Vitamin A - 15.27(IU) 10.11(IU)
- - -
Vitamin E 4.45 1.3 0.12 - - -
Vitamin K - 0.59 - - - -
References [67] [69] [70] [71] [66] [71]

5. Current Knowledge on the Utilization of Fruit by-Products

5.1. Banana Fruit

Banana peel is used to produce livestock feed, fertilizer, biogas, and oil [22]. In addition, it is used as a means of heavy metal removal in water purification [79]. Uses of banana by-products in various industries are presented in Table 5, Table 6 and Table 7.

5.2. Apple Fruit

About 20% of apple pomace is used traditionally for compost and animal feed, while an oversized proportion of almost 80% remains underutilized and discarded with a great negative impact on the environmental [50].

5.3. Mango Fruit

Mango seed kernels are used for making multipurpose nutraceuticals owing to their high composition of phytochemicals like phenolic acids, flavonoids, catechins, hydrolyzable tannins, and xanthanoids [29,30]. Mango peel is an excellent source of pectin, enzymes, and fiber for functional food development, while only a few studies show utilization of mango by-products for non-food applications as biosorbents [80]. Bio-sorbents are biological materials containing a variety of functional sites that have the ability to remove heavy metals such as cadmium (Cd) and lead (Pb) from aqueous solutions [81]. In addition, mango seeds are used as bio-sorbents to remove heavy metals such as chromium (Cr) [82] and the dye malachite green, which is widely used for food coloring, textile, paper, and acrylic industries [83].
Table 4. The main bio-active compounds found in some common fruit by-product.
Table 4. The main bio-active compounds found in some common fruit by-product.
Bioactives Sources Bioactivity/preservative References
Flavonols Pomegranate peels, orange peels, tamarind seeds, mango peels Antioxidants [72]
Pectins kiwifruit, pomegranate, apple and orange peels Food additive, thickening agent [73]
Amino acids and
proteins		 Mandarin by-products, pineapple peels, papaya peels Good source of protein [74]
Polyphenols Avocado seed Antioxidant activity [41]
Phenolic compounds Banana peel Antioxidant activity [23]
Triterpenoids Apple pomace Anti-inflammatory, anti-microbial, [26,75]
Limonoids Citrus seed Anti-inflammatory, anti-cancer, anti-bacteria, antioxidant activities [76]
Phenolic acids, flavones, flavanones Citrus peel and pulp Antioxidant, anti-inflammatory, anti-cancer properties [77]
Carbohydrates (pectin and pectin oligosaccharides) Apple pomace Dietary fibre, prebiotic, hypo cholesterolemic [78]

5.4. Citrus Fruit

Citrus peels are dried and mixed with pulp to produce molasses for cattle feed. Pectin extracted from citrus peels has immuno-modulatory effects on the levels of cytokine secretion in the spleen of mice with a pro-inflammatory potential, as previously reported [84]. Recently, citrus by-products are gaining attention and being valorized by using anaerobic digestion for the production of biogas and fermentation to produce high value-added chemicals and biofuels [85].

5.5. Grapes

Most often, grape by-products are used for distillate preparation, animal feed, and compost [38]. Grape seed is one of the major by-products with dense bioactive components. Different uses of grape by-products in various industries are listed in Table 5, Table 6 and Table 7.

5.6. Avocado Fruit

Avocado by-products have many interesting properties that widen their application prospects. Avocado by-products can be utilized for energy production; its pulp oil is used for biodiesel, and its seed oil is used for biodiesel, charcoal, liquid fuels, and fuel additives [59]. Additional utilization of avocado by-products in some industries is listed in Table 5, Table 6 and Table 7.

5.7. Pineapple Fruit

Pineapple processing generates a huge amount of by-products like residual pulp, peels, stems, cores, and leaves [86], which represent 45–65% of the residuals, which, in most cases, are discarded as waste with significant environmental pollution potential if not properly and efficiently utilized [87]. Pineapple peel is used as a source for the extraction of antioxidant compounds (phenolic compounds such as ferulic acid and vitamins A and C). Successful extraction and recovery of these antioxidant compounds could have implications for the production of antioxidant-rich functional foods [88]. Pineapple by-products can also be used for bioethanol production and bromelain extraction [89].
Table 5. Utilization of some common fruit by-products in food industries.
Table 5. Utilization of some common fruit by-products in food industries.
Fruit by-product Uses in food industries Reference
Apple pomace Apple pomace used as a dietary fiber source in some baked foods, chicken meat-based sausages and yoghurt products [94,95]
Apple pomace Used as stabilizers for oil-water emulsions and have an antimicrobial activity [96]
Apple seed Addition of defatted apple seed powder into chewing gum enhanced phloridzin uptake [97]
Avocado by-product Avocado by-products can be used as antioxidants, antimicrobials, and food additives such as colorants, flavorings, and thickening agents [15]
Avocado peel Dried peels used in a functional beverage formulation (tea rich in antioxidants) [98]
Avocado peel Peel extract’s used to inhibit lipid peroxidation and to avoid oxidation of meat proteins [99]
Avocado seed Seed starch used for biodegradable polymers for drug delivery or food pack by-product [100]
Seeds can act as functional ingredients in foods, considering their composition in total fiber (lignin, cellulose and hemicelluloses) [101]
Banana peel The flour obtained from unripe banana peels used for colon health effects due to its high resistant starch content and ripe peels is digestible due to the high content of starch and proteins [46]
Banana peel Banana peel jelly has antioxidant properties
 [102]
Citrus peel Citrus peels used as a source of molasses, pectin, oil and limone [103]
Citrus (pectin) Citrus pectin is used as thickener, emulsifier and stabilizer in many foods (jams, jellies, and marmalades and other products)
Citrus (pectin) Pectin is a suitable polymeric matrix for edible films for active food pack by-product [104]
Citrus essential oils Citrus essential oils are GRAS; and are used as antimicrobials, antifungal and flavoring agents [105]
Grape pomace Meat and fish derivatives containing grape pomace powders shows improved sensory and physical properties [106]
Grape (stems, seeds and skins) Fiber from grape pomace used as functional ingredient in bakery products [107]
Grape seed Oil obtained from grape seed is rich in linoleic acid (60–70%), as well as in tocopherols, which hinder their oxidation [108]
Mango peel Mango peel powder used as source of antioxidant and dietary fiber in macaroni [109]
Mango peel seed kernel mango peels and seed kernels powders used as sources of phytochemicals in biscuit [110]
Mango peel extract Peel extracts used into gelatin-based films for active food pack by-product due to its free radical scavenging activity and improvements in film strength [111]
Mango peel Edible films made of mango peel showed good permeability and hydrophobicity properties [112]
Pineapple peel Pineapple peel is rich source of sugar that can be used as nutrients in fermentation processes [113]
Pineapple core Core can be used in pineapple juice concentrates, vinegar and wine production [113]
Pineapple stem Bromelain enzyme, extracted from the pineapple stem used as a meat tenderizer, a bread dough improver, a fruit anti-browning agent, a beer clarifier [114]

6. Prospective Impact of Fruit by-Products on Food and Nutrition Security

According to FAO, more than 820 million people in the world are still suffering from hunger in 2018, which underscores the immense challenge of achieving the Zero Hunger target by 2030 [90]. Therefore, the search for alternative food sources for human consumption with high nutritive value is needed. These alternative and innovative food sources would fulfill the need to feed the exponentially growing human population as 70% more food is needed to cover the gap, which becomes an imperative. On one hand, exploring the unexplored, refining the unrefined traits, cultivating the uncultivated, and popularizing the unpopular remain the most appropriate steps proposed by some researchers to achieve food and nutrition security with consideration of the current global food challenges [91,92,93]. On the contrary, a significant amount of by-products from the fruit processing industry are discarded due to ineffective management and disposal systems. Such fruit by-products have been proven to be rich sources of nutritious and bioactive components and have a considerable effect on the economy and environmental safety. As a result, a careful investigation of the adequate supply of nutritious components from by-products may be of interest and appear to have a positive impact on global food and nutrition security.
Table 6. Utilization of common fruit by-products in medicinal and Pharmaceutical industries.
Table 6. Utilization of common fruit by-products in medicinal and Pharmaceutical industries.
Fruit by-product Uses in Pharmaceutical industries Reference
Guava leaf Guava leaves contain a high level of antioxidants, phenolic compounds and immune-stimulatory agents [115]
Apple phloridzin It can inhibit lipid peroxidation and prevent bone loss, enhance memory and even inhibit cancer cell growth [116,117,118]
Apple peel Apple peel consumption improves metabolic alterations associated with a fat-rich diet and also slowed the atherogenesis development [119]
Avocado peel extracts Avocado peel extract has been proved to be used as inhibitors for the inflammation mediator nitric oxide by a possible reduction of free radicals during inflammation [60]
Avocado peel and seed Polyphenols from avocado peel and seed possess anti-cancer, anti-diabetic and anti-hypertensive effects [41]
Banana peel The bioactive compounds extracted from peel Antioxidant, anti-bacterial, anti-fungal activity, reducing blood sugar, lowering cholesterol, anti-angiogenic activity, neuro-protective effect [23,110]
Banana Peel Banana peels are used to synthesize bio-inspired silver nano-particles which used as antimicrobials to pathogenic fungi and some bacterial species [79]
Citrus pulp and seed D-limonene was shown to exhibit a therapeutic effect on lung cancer mice and breast cancer in mice and rat [120,121]
Grape byproduct Grape by-products used in pharmaceuticals due to their antibacterial, anti-viral, and anti-fungal properties. they also showed anti-inflammatory actions [58,122]
Grapes-seed oil
 Grapes seed oil evaluated in various in vitro and in vivo tests showed anti-microbial, anti-inflammatory, cardio-protective and anticancer properties [123]
Mango seed and peel Seed and peel extracts were shown to have anti-inflammatory and anti-oxidative properties on vivo studies related to obesity, diabetes, CVD and skin cancer [124]
Mango pectin Pectin extracted from mango by-products used for prevention and reduction of carcinogenesis [125]
Mango seed/peel Mangiferin extracted and isolated from the seed/peel shows strong anti-oxidant, anti-tumor, anti-bacterial, and immuno-modulatory effects [126]
Peach kernel Peach kernels phenols, carotenoids and cyanogenic glycosides, have Antidiabetic, antioxidative, and anti-aging properties [127]
Proper management of these by-products is believed to be the key opportunity to increase their utilization. This includes cost-effective extraction techniques that give optimum yields of the by-products for their reuse in a wide array of industrial applications. Therefore, it is important to carry out such studies within the realm of the fruit regarding the by-products' extraction and wider utilization. This can significantly help to reduce food loss and waste, which can improve food security and environmental sustainability. It has been reported that fruit by-products such as skins, cores, stems, shells, stones, and seeds account for 50–60% of fresh fruit. In most cases, by-products appear to have higher nutritional values than the pulp [15]. Paradoxically, human feeding habits have given preference and priority to a smaller portion of the fruit, resulting in food and nutritional insecurity.
Table 7. Utilization of some common fruit by-products in biotechnology.
Table 7. Utilization of some common fruit by-products in biotechnology.
Fruit by-products Uses in biotechnology Reference
Apple pomace Apple pomace used as a substrate for value-added products, such as enzymes, aroma compounds and organic acids [128]
Avocado peel Carbonaceous material produced from avocado peel is used as alternative adsorbent for dyes removal [129]
Banana peel Banana peels can be used as a substrates by solid state fermentation (SSF) to produce enzymes and organic acids [130]
Banana peel Organic acids (citric, lactic and acetic acid) were successfully produced from banana peels with Aspergillus niger or Yarrowia lipolytica [131]
Orange peel Orange peels as a substrate to produce pectinolytic, cellulolytic and xylanolytic enzymes by (SSF) using fungi from the genera Aspergillus, Fusarium, and Penicillium [55]
Grape by-products Grape by-products have been used as a substrates for the production of hydrolytic enzymes such as cellulase and pectinase [132]
Mango peel Mango peels were used to produce lactic acid (up to 17.5g/L) and pectinase enzyme [133]
Mango seed-kernel Mango seed kernels were used to produce α-amylase with Fusarium soloni [134]
Pineapple peel Pineapple peel can be used as a substrate for methane, ethanol and hydrogen generation by S. cerevisiae and Enterobacter aerogenes [8]
Pineapple peel Pineapple peels have been anaerobically digested to yield biogas in the form of methane [135]
Pineapple & orange peel Bioethanol is produced from fruit peels of pineapple, orange and sweet lime using S. cerevisiae [136]
Papaya seed Papaya seeds are used as biosorbents to remove heavy metals such as lead and cadmium [137]

7. Summary and Research Need

This review presents important information on fruit processing and by-product utilization. Several previous studies have confirmed that depending on the type of fruit, variety, and cultivation conditions, up to 60% loss occurs. Such a huge loss of fruit by-products has a significant negative implication for the economy, environment, and social well-being worldwide. Fruit by-products are good sources of nutrients and bioactive components, implying that they could have an important role in functional food development. These bioactive compounds have anti-cancer, anti-diabetic, anti-microbial, anti-oxidative, and immune-modulatory effects, confirming their role in nutraceuticals. Furthermore, fruit processing and by-products are also used as a substrate for the production of organic acids, essential oils, enzymes, fuel, biodegradable packaging, and preservatives. Given the significant importance of fruit processing by-products in food insecurity alleviation, health promotion, and environmental sustainability, further studies aiming at addressing this knowledge gap are greatly important.

Author Contributions

Conceptualization, E.T. and T.T.; methodology, E.T., T.T., and M.M.U.; writing—original draft preparation, E.T., and M.M.U.; writing—review and editing T.T., M.M.U. R.N., J.R.R., D.V.H., and T.A.; supervision, T.T., R.N., J.R.R., D.V.H., and T.A. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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Table 1. Proximate composition (%) of some common fruit byproducts.
Table 1. Proximate composition (%) of some common fruit byproducts.
By-product Moisture Ash Protein Fat Carbohydrate Fiber (%) References
Apple pomace 8–10.6
 1–6.1 3–5.67 1.2–3.9 48–62 4.7–51.1 [51]
Mango seed kernel 45.2 3.2 6.36 13.3 32.2 2.02 [53,63]
Ripe mango peel flour 7.86 4.5 4.1 4 29.4-32 51.1-54.2 [64]
Banana peel 13.6 9.83 5.53 23.93 32.39 14.83
Avocado peel - 3 4.5 4.6 72 3.8 [59]
Avocado seed 67.2 2.3 9.6 3.9 - 10.7
[65]
Pineapple raw peel
 82.7 5.0 8.9-9.2 1.3 - 16.3
Papaya raw peel
 86.8 11.6 20.27 2.3 - 18.5
Papaya seed 5.8 6 23.6 23.5 - 47.2
Grape pomace 3.37
 4.68 8.49 8.16 29.20 46.17 [66]
Citrus peel 2.49 13.20 0.42 9.74 71.57 2.58 [67]
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