Pomegranate, a concentrate of antioxidants

The pomegranate,  Punica granatum L., belonging to the family of  Lythraceae, although historically classified within the Punicaceae, represents one of the most fascinating and symbolically rich fruit tree species ever cultivated by humanity. Its history is inextricably linked with that of the Mediterranean basin, of which Italy has always been the beating heart.

A fruit with very ancient origins, mentioned in sacred texts, mythologies, and medical treatises for its regenerative and therapeutic virtues, the pomegranate has experienced varying fortunes in consumer preferences. However, in recent decades, renewed and growing interest, supported by solid scientific evidence concerning its nutraceutical properties, has brought it back into the spotlight of the global fresh produce market (Viuda-Martos et al., 2010).

Botany, origins and distribution

Punica granatum L. is a deciduous tree or shrub species of medium size, generally between three and six meters tall, although century-old specimens can reach larger dimensions. It often has a bushy and irregular habit, with gray-brown bark that tends to crack with age. Young branches are frequently spiny, an adaptation that has probably favored the species in nature.

The  the leaves, opposite or sub-opposite, are entire, lanceolate, bright green and shiny on the upper side, lighter on the underside, with a short often reddish petiole.

Spectacular flowering

The flowering, spectacular and prolonged, occurs between late spring and early summer. The flowers, hermaphrodite, are solitary or grouped in small clusters at the tips of the year’s shoots. They feature a showy corolla with petals of intense red-orange color, often wavy, and a fleshy and leathery calyx, also red in color, tubular in shape that will persist to cover the base of the fruit. It is precisely the shape of the calyx that gives the pomegranate the characteristic ‘crown’, a distinctive element of the fruit.

There exist  two types of flowers: those in flask shape (brachyblasts), which are fertile and will give rise to the fruit, and those bell-shaped, which are sterile and will fall off early. Pollination is mainly entomophilous, carried out by bees and other pollinating insects.

The fruit

The fruit, technically called balausta, is a modified berry, spheroidal in shape, with a diameter varying according to the cultivar from five to over twelve centimeters. The skin, or pericarp, is tough, thick, and ranges in color from yellow-green to intense red, to purplish, often speckled with brown.

Inside, the fruit is divided by membranous septa (white and spongy tissue) into chambers or locules, which contain a large number of arils. Thearil is the edible part and consists of a juicy sarcocarp of ruby red, pink, or almost transparent color, which surrounds a woody seed (or soft, in some cultivars). Maturation occurs in autumn, generally from September to November in the northern hemisphere.

Origins, from Iran to the Himalayas

The origins of the pomegranate are subject to debate, but it is believed that the species is native to a vast area extending from Iran to the Himalayan range in northern India (Viuda-Martos et al., 2010). From these territories, its cultivation spread rapidly throughout the eastern Mediterranean and the Middle East already in prehistoric times.

The Phoenicians, skilled navigators, probably favored its spread along the coasts of North Africa and Spain. It was then the Carthaginians and, subsequently, the Romans who introduced it permanently in Italy, where it found an ideal habitat, especially in the southern and island regions. The genus name, Punica, derives from the Latin punicus (Carthaginian), while the species name, granatum, refers to the abundance of seeds (grana), similar to grains of wheat.

Its symbolism related to fertility, wealth, and eternal life is found in numerous cultures, from Greek mythology (the abduction of Persephone) to Christian art, where it is often depicted in the hands of the Infant Jesus.

Main Italian varieties and their characteristics

The biodiversity of pomegranate in Italy is remarkable, the result of centuries of local selection and adaptation to specific microclimates. Alongside widely grown international cultivars, such as Wonderful, there are native ecotypes of extraordinary quality, often with protected designation or Slow Food presidium.

Horse Tooth

The Dente di Cavallo cultivar, native to Sicily and particularly widespread in the Agrigento area, is considered one of the best in the world for the quality of its arils. The fruit is large, with a yellow-pink colored skin, not particularly intense. The distinctive characteristic of the Dente di Cavallo, from which it takes its name, is the size and sweetness of the arils. They are a vivid ruby red color, very large, long and pointed, just like teeth. The pulp is extremely juicy, with a perfectbalance between sugars and acidity that gives it an aromatic, fresh taste that is not cloying. The seed, although present, is of medium hardness.

The organoleptic properties make this cultivar excellent for fresh consumption. The complex flavor and crunchy texture of the arils lend themselves to enriching salads, fruit salads, spoon desserts, as well as for fresh consumption. The juice is delicious but little spread industrially due to the high raw material costs and non-optimized yield for juicing. Therefore, it is a variety mainly intended for the market. high-end fresh.

Ragana

Another Sicilian excellence, Ragana (or Racina) produces medium-sized fruits with a dark red skin tinged with yellow. Its peculiarity lies in the arils: dark red, almost violet in color, they are characterized by a very high concentration of  phenolic compounds, which results in a more intense, tannic and acidic flavor compared to Dente di Cavallo.

The juice is dense, very dark in color and has a complex aromatic profile, rich in notes of berries. This richness in antioxidants makes it  ideal for processing.

In domestic use, its arils can be a bit too tart for some palates, but they are perfect to counterbalance the sweetness of aged cheeses or to create sweet and sour sauces for red meats and game. The fruits of this cultivar are suited for juicing to produce high-quality single-variety juices, nectars, and concentrates, thanks to their high anthocyanin content and strong flavor.

Profeta Partanna

The Partanna variety, a Slow Food presidium, is cultivated in the homonymous area in the province of Trapani. The fruit is medium-sized, with a thin light yellow-green skin striped with red. The arils are light pink, almost translucent in color, and their main characteristic is  extraordinary sweetness and the tenderness of the seed. In many specimens, the seed is so tender as to be almost imperceptible during chewing, offering a unique and very pleasant consumption experience. The flavor is delicate, very sweet and low in acidity, with floral notes.

It is the cultivar  /ideal for fresh consumption, especially for those who do not tolerate the woody seeds of common varieties. It is also excellent for the preparation of granitas, sorbets and ice creams, where its natural sweetness and the softness of the arils are best expressed. The thin skin and slightly higher perishability make it less suitable for long journeys or large-scale industrial transformation, consolidating its role as a niche product in the area.

Tondo Siria

Widespread in Puglia, especially in Salento, the Tondo Siria produces fruits of regular spheroid shape, medium-large size. The skin is red-orange in color, not too thick. The arils are intense red, medium-sized, with a good balance between sweetness and acidity. The flavor is pleasant and versatile. It is a rustic and productive cultivar, well adapted to different pedoclimatic conditions.

For its intermediate characteristics, it is  /suitable both for fresh consumption and processingAt home, its arils are excellent in cooking to garnish main courses or to make jams. At the industrial level, it can be used for juice production, often blended with more acidic varieties to round out their flavor.

Wonderful

Although of Californian origin (introduced from Italy at the end of the 19th century), the Wonderful is  the most widespread cultivar worldwide and is also widely cultivated in Italy, especially in the South. The fruits are large, with a thick and leathery bright red skin. The arils are very dark purplish red, crunchy, with an intensely sweet and sour taste and a marked tannic note.

It is a very productive variety, with a long  shelf-life and good transport resistance, which makes it  the queen of the international market. Its juice, very dark in color and rich in antioxidants, is the reference standard for the industry. It is indeed the base for most pomegranate juices, concentrates, and supplements, thanks to its high yield and color stability.

In domestic use, its strong flavor may not appeal to everyone, but it is appreciated by those who seek a pungent taste.

Nutritional aspects and health benefits

The pomegranate has been elected a 'superfood' by the scientific community and the media, not by chance. Its fame is supported by a unique nutritional composition and a rich phytochemical profile. The fresh pulp (arils) is composed of about 80% water and 13-16% carbohydrates, mainly fructose and glucose, which determine its  moderate caloric power (about 65-70 kcal per 100 grams of edible portion). It contains fiber, both insoluble (present in a small part in the seed) and soluble, and a modest amount of proteins and lipids.

A full load of antioxidants

However, the true treasure of the pomegranate lies in its  bioactive compounds. The most important are:

1. organic acids. Mainly citric acid, which gives the sour note, but also malic, tartaric and others, which contribute to the flavor and stability of the fruit;
2. polyphenols. This is the most studied class of compounds. It includes:

• ellagic and gallic acid: phenolic acids with powerful antioxidant properties;
• flavonoids, such as anthocyanins (cyanidins, delphinidins), responsible for the red-blue coloration, and flavonols (quercetin, kaempferol).
• punicalagins: hydrolyzable tannins exclusive to pomegranate, present in large quantities in the peel and in the membranous septa, and to a lesser extent in the juice. Punicalagins are among the most powerful antioxidants in the plant kingdom and are considered the main agents responsible for many of the beneficial effects attributed to pomegranate juice.

Potential beneficial effects

Scientific research, through in vitro and in vivo studies, on animal models and some clinical trials in humans, has investigated numerous potential effects of pomegranate on health. It is necessary to specify that, although the results are promising, further confirmation is often needed. The most promising areas of investigation concern:

• antioxidant activity. The pomegranate's ability to neutralize free radicals and oxidative stress is extraordinarily high (Lansky & Newman, 2007; Basu & Penugonda, 2009), higher than that of many other fruits and beverages such as green tea and red wine. This effect is crucial in counteracting cellular aging and DNA damage;
• cardiovascular protection. Several studies suggest that the regular consumption of pomegranate juice may help reduce systolic blood pressure (Aviram & Dornfeld, 2001), improve lipid profile (by reducing LDL oxidation, the so-called 'bad cholesterol'), and attenuate the atherosclerotic process (Basu & Penugonda, 2009);
• anti-inflammatory activity. Pomegranate compounds are able to modulate inflammation signaling pathways (Lansky & Newman, 2007; Viuda-Martos et al., 2010), a key factor in many chronic diseases, from arthritis to metabolic disorders;
• antitumor effects. Preliminary studies have observed the ability of pomegranate extracts to inhibit proliferation and induce apoptosis (programmed cell death) in various tumor cell lines, such as prostate, breast, and colon cancer (Lansky & Newman, 2007; Adhami et al., 2009). However, these highly interesting data do not authorize considering pomegranate as a therapy, but rather as a powerful functional food within a preventive diet;
• antimicrobial activity. Peel and juice extracts have shown antibacterial and antifungal properties, mainly due to the action of tannins (Chen et al., 2020).

Pomegranate cultivation in Italy

The pomegranate is a hardy species, well adapted to the hot-arid environments of the Mediterranean. It prefers mild winters and warm, sunny summers for fruit ripening. It is sensitive to late frosts, which can damage flowers, and water stagnation, which causes root asphyxia and rot. It adapts to different soil types, provided they are well-drained, with a preferably neutral or slightly alkaline pH.

Essential inputs

Rational pomegranate cultivation requires a series of precise inputs and agronomic practices. Theirrigation is fundamental, especially during the period from fruit set to fruit ripening. Drip or micro-flow techniques allow significant water savings and efficient supply. The  Fertilization It must be balanced; excess nitrogen, while promoting vegetative growth, can reduce the size and quality of the fruit and delay ripening. Important contributions of phosphorus and potassium, the latter crucial for sugar accumulation and coloring, are needed. The  Pruning aims to aerate the canopy, remove suckers, encourage the formation of mixed branches (fruit bearers), and renew the vegetation. Overly severe pruning can stimulate vigorous vegetative regrowth to the detriment of production.

Pests and fungal diseases

Adversity management is another crucial point. Among animal pests, the most feared are the pomegranate moth (Cryptoblabes gnidiella), whose larvae develop inside the fruit, and the fruit fly (Ceratitis capitata).

Among fungal diseases, root rots (e.g. Phytophthora species) and fruit rots (e.g. Botrytis cinerea, Alternaria species) are the most common, favored by excess humidity.

Organic Italian pomegranate

Pomegranate cultivation with the  organic system is widely practiced in Italy where, based on prevention, it can offer productions of very high quality. This method is based on the use of resistant rootstocks, on promoting biodiversity in the agroecosystem (through hedges and nectariferous plants that attract beneficial insects) and on the adoption of soil cultivation techniques that preserve its structure. Composted manure, green manure, and organic amendments contribute to soil fertility.

Plant protection in organic pomegranate cultivation uses low-impact products such as kaolin to create a physical barrier against insects, and copper- and sulfur-based preparations for fungal diseases. Control of the moth is mainly carried out with pheromone traps for monitoring and mass capture and with biological products based on Bacillus thuringiensis.

The choice of resistant cultivars and timely harvesting complete the picture of sustainable management, which aims to minimize residues on the final product and preserve the environment.

The Italian pomegranate production: the regional excellences

The Italian pomegranate production, although lower in quantity compared to giants like Turkey, India, Iran or Spain, stands out for quality, typicality and sustainability.

The cultivated area is in constant – albeit slow – expansion, driven by growing market interest. The leading regions are undoubtedly Sicily and Apulia, which alone concentrate most of the Italian production, thanks to their ideal climate.

In Sicily, the provinces of Agrigento, Caltanissetta, and Trapani are the beating heart of cultivation, with a strong enhancement of native cultivars such as Dente di Cavallo and Profeta Partanna. In Apulia, production is widespread throughout Salento and the province of Taranto, with a predominance of Tondo Siria and Wonderful.

Other regions of Central-South Italy, such as Calabria, Basilicata, Sardinia, and Lazio, are developing small but interesting production districts, often linked to projects for the recovery of local varieties.

Destination premium markets

Italian production is characterized by fragmentation into often small and medium-sized companies, which are finally beginning to network through consortia and collective brands to enhance the product and tackle the market with a structured approach.

A large part of the high-end production, especially organic, still finds outlets in niche markets, direct sales at the company, Solidarity Purchase Groups (GAS), and quality catering that knows how to appreciate local raw materials.

The national processing industry, mainly dedicated to juice production, is still small in size and often uses Italian raw materials for products  premium, while for standard lines it has to contend with competition from low-cost foreign concentrates.

Buying guide

Choosing a good pomegranate is essential to fully appreciate its qualities. Here are some criteria to follow:

• weight and size. A ripe and juicy pomegranate should be heavy for its size. Prefer firm and not light fruits;
• skin. The color, variable depending on the cultivar, must be bright and intense. It should not have bruises, cuts, or soft parts. A slightly ‘withered’ or not perfectly smooth skin is not necessarily an indication of poor internal quality; in some varieties, such as Dente di Cavallo, it is even characteristic. On the contrary, a skin that is too shiny and perfect can sometimes indicate too early harvesting;
• shape. It must be round and full, without sharpness or flattening.
• crown. The crown (the remnant of the calyx) must be dry, brown in color, and intact. Avoid fruits with a moldy or green crown, which is a sign of immaturity.

How to store it

Regarding the  storage, whole pomegranates keep well at room temperature, in a cool and dry place, for about a week. If you want to store them longer (up to several weeks), you can put them in the refrigerator, in the vegetable drawer.

Once opened and seeded, the pomegranate must be stored in the refrigerator and consumed within 3-4 days. For prolonged storage, the arils can be  frozen individually on a tray and then transferred to freezer bags, where they keep perfectly for months, ready to be used in juices or culinary preparations.

Quality Italian pomegranate vs. Turkish pomegranate

The distinction between the high-end Italian pomegranate, often organic, and the Turkish one dominating the global market is clear and plays out on several fronts.

The  Italian pomegranate of quality is the product of a short, attentive, and sustainable supply chain. Harvesting takes place at full  ripeness, when the fruit has developed all its sugar and aromatic potential.

The native cultivars are selected for the  flavor, not just for yield or transport resistance. This results in a product with a complex, balanced organoleptic profile, where sweetness, acidity, and aromas blend harmoniously. The  organic farming or advanced integrated pest management guarantees very low pesticide residues and greater respect for the ecosystem. The geographical proximity between the production site and the consumption market (zero or near-zero kilometers) minimizes the time between harvest and table, preserving intact the  nutritional properties  and freshness. In summary, the Italian pomegranate is a product for experiential consumption, seeking sensory pleasure, healthiness, and traceability.

The  Turkish pomegranate which dominates the shelves of large-scale organized distribution in the first part of the season (September-October) responds to completely different logics: volume, standardization, and long preservation. The cultivars used (often Wonderful or similar) are chosen for mechanical resistance, the thick skin that protects during long journeys, and the uniform and attractive exterior appearance. Harvest often occurs at times of  pre-ripening to allow damage-free transport. This irreparably compromises the taste: the fruit may look beautiful, but the palate often finds it less sweet,  more acidic, astringent and with underdeveloped aromas. The long supply chain and transport times (by sea and road) impact  negatively on the content of  vitamins and antioxidants, which are molecules sensitive to time and storage conditions.

International buyers seeking excellence in a high-end organic Italian pomegranate can rely on the expert guidance of GIFT (Great Italian Food Trade).

Marta Strinati

Credit cover: Photo courtesy Stefano Roveda 

References

• Adhami, V. M., Khan, N., & Mukhtar, H. (2009). Cancer chemoprevention by pomegranate: Laboratory and clinical evidence. Nutrition and Cancer, 61(6), 811–815.  https://doi.org/10.1080/01635580903285064
• Aviram, M., & Dornfeld, L. (2001). Pomegranate juice consumption inhibits serum angiotensin converting enzyme activity and reduces systolic blood pressure. Atherosclerosis, 158(1), 195–198.  https://doi.org/10.1016/S0021-9150(01)00412-9
• Basu, A., & Penugonda, K. (2009). Pomegranate juice: A heart-healthy fruit juice. Nutrition Reviews, 67(1), 49–56.  https://doi.org/10.1111/j.1753-4887.2008.00133.x
• Chen, J., Liao, C., Ouyang, X., Kahramanoğlu, I., Gan, Y., & Li, M. (2020). Antimicrobial Activity of Pomegranate Peel and Its Applications on Food Preservation. Journal of Food Quality, 2020(1), 8850339. https://doi.org/10.1155/2020/8850339
• Lansky, E. P., & Newman, R. A. (2007). Punica granatum (pomegranate) and its potential for prevention and treatment of inflammation and cancer. Journal of Ethnopharmacology, 109(2), 177–206.  https://doi.org/10.1016/j.jep.2006.09.006
• Viuda-Martos, M., Fernández-López, J., & Pérez-Álvarez, J. A. (2010). Pomegranate and its many functional components as related to human health: A review. Comprehensive Reviews in Food Science and Food Safety, 9(6), 635–654.  https://doi.org/10.1111/j.1541-4337.2010.00131.x