The Chokeberries (Aronia) are two species of deciduous shrubs in the family Rosaceae, native to eastern North America. The two species are readily distinguished by their fruit colour, from which the common names derive. The leaves are alternate, simple, and with crenate margins; in autumn the leaves turn a bold red colour. The flowers are small, with 5 petals, and produced in corymbs of 10-25 together. The fruit is a small pome, with a very astringent, bitter flavour; it is eaten by birds (birds do not taste astringency and feed on them readily), which then disperse the seeds in their droppings. The name "chokeberry" comes from the astringency of the fruit, which are inedible raw.

Red Chokeberry, Aronia arbutifolia, grows to 2-4 m tall, rarely up to 6 m, with leaves 5-8 cm long. The flowers are white or pale pink, 1 cm diameter, and the fruit red, 4-7 mm diameter.

Black Chokeberry, Aronia melanocarpa, tends to be smaller, rarely exceeding 1 m tall, rarely 3 m, and spreads readily by root sprouts. The leaves are smaller, not more than 6 cm long. The flowers are white, 1.5 cm diameter, and the fruit black, 6-9 mm diameter.

The two species can hybridise, giving the Purple Chokeberry, Aronia x prunifolia. It is intermediate between the parents, having purple berries.

Uses

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The chokeberries are attractive ornamental plants for gardens. They are naturally understory and woodland edge plants, and grow well when planted under trees. Chokeberries are resistant to drought, insects, pollution, and disease. Several cultivars have been developed for garden planting, including A. arbutifolia 'Brilliant', selected for its striking fall leaf colour, and A. melanocarpa 'Viking' and 'Nero', selected for larger fruit suitable for jam-making. Juice from these berries is astringent and not sweet, but high in Vitamin C and antioxidants, and the berries can be used to make juice, wine, and jam after cooking. It is also used as a soft drink flavoring.

Food use

Aronia melanocarpa (chokeberry) has attracted scientific interest due to its deep purple, almost black pigmentation that arises from dense contents of phenolic phytochemicals, especially anthocyanins. Total anthocyanin content in chokeberries is 1480 mg per 100 g of fresh berries, and proanthocyanidin concentration is 664 mg per 100 g (Wu et al. 2004, 2006). Both values are among the highest measured in plants to date.

The plant produces these pigments mainly in skin of the berries to protect the pulp and seeds from constant exposure to ultraviolet radiation. By absorbing uv rays in the blue-purple spectrum, pigments filter intense sunlight and thereby have a role assuring regeneration of the species. Brightly colorful pigmentation also attracts birds and animals to consume the fruit and disperse the seeds in their droppings.

Anthocyanins not only contribute toward chokeberry's astringent property (that would deter pests and infections) but also give Aronia melanocarpa extraordinary antioxidant strength that combats oxidative stress in the fruit during photosynthesis.

A test tube measurement of antioxidant strength, the Oxygen Radical Absorbance Capacity or ORAC, has demonstrated chokeberry with one of the highest values yet recorded, of 16,100 micromoles of Trolox Eq. per 100 g (Wu et al. 2004). See the ORAC page for reference to other antioxidant plant foods. There is growing appreciation for consumers to increase their intake of antioxidant-rich plant foods from colorful sources like berries, tree or citrus fruits, vegetables, grains, and spices. Accordingly, a deep blue food source such as chokeberry yields anthocyanins in high concentrations per serving, indicating potential value as a functional food or nutraceutical.

Analysis of anthocyanins in chokeberries has identified the following individual chemicals (among hundreds known to exist in the plant kingdom); cyanidin-3-galactoside, epicatechin, caffeic acid, quercetin, delphinidin, petunidin, pelargonidin, peonidin and malvidin. All these are members of the flavonoid category of antioxidant phenolics.

For reference to phenolics, flavonoids, anthocyanins and similar plant-derived antioxidants, Wikipedia has a list of phytochemicals and foods in which they are prominent.

Efficacy in Disease Models

Chokeberry's rich antioxidant content may be beneficial as a dietary preventative for reducing the risk of diseases caused by oxidative stress. Among the models under evaluation where preliminary results show benefits of chokeberry anthocyanins are colorectal cancer (Lala et al. 2006), cardiovascular disease (Bell & Gochenaur 2006), chronic inflammation (Han et al. 2005), gastric mucosal disorders (peptic ulcer) (Valcheva-Kuzmanova et al. 2005), eye inflammation (uveitis) (Ohgami et al. 2005) and liver failure (Valcheva-Kuzmanova et al. 2004).

References

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• Bell, D. R., & Gochenaur, K. (2006). Direct vasoactive and vasoprotective properties of anthocyanin-rich extracts. J Appl Physiol. 100 (4): 1164-70.
• Han, G.-L., Li, C.-M., Mazza, G., & Yang, X.-G. (2005). Effect of anthocyanin rich fruit extract on PGE2 produced by endothelial cells. Wei Sheng Yan Jiu. 34 (5): 581-4.
• Lala, G., Malik, M., Zhao, C., He, J., Kwon, Y., Giusti, M. M., & Magnuson, B. A. (2006). Anthocyanin-rich extracts inhibit multiple biomarkers of colon cancer in rats. Nutr. Cancer 54 (1): 84-93.
• Ohgami, K., Ilieva, I., Shiratori, K., Koyama, Y., Jin, X.-H., Yoshida, K., Kase, S., Kitaichi, N., Suzuki, Y., Tanaka, T., & Ohno, S. (2005). Anti-inflammatory effects of aronia extract on rat endotoxin-induced uveitis. Invest Ophthalmol Vis Sci. 46 (1): 275-81.
• Valcheva-Kuzmanova, S., Marazova, K., Krasnaliev, I., Galunska, B., Borisova, P., & Belcheva, A. (2005). Effect of Aronia melanocarpa fruit juice on indomethacin-induced gastric mucosal damage and oxidative stress in rats. Exp Toxicol Pathol. 56 (6): 385-92.
• Valcheva-Kuzmanova, S., Borisova, P., Galunska, B., Krasnaliev, I., & Belcheva, A. (2004). Hepatoprotective effect of the natural fruit juice from Aronia melanocarpa on carbon tetrachloride-induced acute liver damage in rats. Exp Toxicol Pathol. 56 (3): 195-201.
• Wu, X., Gu, L., Prior, R. L., & McKay, S. (2004). Characterization of anthocyanins and proanthocyanidins in some cultivars of Ribes, Aronia and Sambucus and their antioxidant capacity. J Agric Food Chem. 52 (26): 7846-7856.
• Wu, X., Beecher, G. R., Holden, J. M., Haytowitz, D. B., Gebhardt, S. E., & Prior, R. L. (2006). Concentrations of anthocyanins in common foods in the United States and estimation of normal consumption. J Agric Food Chem. 54 (1): 4069-4075.

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