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Raisins, seedless
Nutritional value per 100 g (3.5 oz)
Energy	299 kcal (1,250 kJ)
Carbohydrates	79.3 g
Sugars	65.2 g
Dietary fiber	4.5 g
Fat	0.25 g
Protein	3.3 g
Vitamins
Vitamins and minerals
Vitamins	Quantity %DV†
Thiamine (B1)	9% 0.106 mg
Riboflavin (B2)	10% 0.125 mg
Niacin (B3)	5% 0.766 mg
Pantothenic acid (B5)	2% 0.095 mg
Vitamin B6	10% 0.174 mg
Folate (B9)	1% 5 μg
Choline	2% 11.1 mg
Vitamin C	3% 2.3 mg
Vitamin E	1% 0.12 mg
Vitamin K	3% 3.5 μg
Minerals	Quantity %DV†
Calcium	5% 62 mg
Copper	30% 0.27 mg
Iron	10% 1.8 mg
Magnesium	9% 36 mg
Phosphorus	8% 98 mg
Potassium	25% 744 mg
Selenium	1% 0.6 μg
Sodium	1% 26 mg
Zinc	3% 0.36 mg
Other constituents	Quantity
Water	15.5 g
	Link to USDA Database entry
	†Percentages estimated using US recommendations for adults, except for potassium, which is estimated based on expert recommendation from the National Academies.

A raisin is a dried grape. Raisins are produced in many regions of the world and may be eaten raw or used in cooking, baking, and brewing. In the United Kingdom, Ireland, New Zealand, Australia and South Africa,^[1] the word raisin is reserved for the dark-colored dried large grape,^[2] with sultana being a golden- or green-colored dried grape, and currant being a dried small Black Corinth seedless grape.^[3]

Etymology

The word raisin dates back to Middle English and is a loanword from Old French; in modern French, raisin means "grape", while a dried grape is a raisin sec, or "dry grape". The Old French word, in turn, developed from the Latin word racemus, which means "a bunch of grapes."^[3]

Varieties

Raisin varieties depend on the types of grapes used and appear in a variety of sizes and colors, including green, black, brown, purple, blue, and yellow. Seedless varieties include sultanas (the common American type is known as Thompson Seedless in the United States), Zante currants (black Corinthian raisins, Vitis vinifera L. var. Apyrena),^[3] and Flame grapes. Raisins are traditionally sun-dried but may also be artificially dehydrated.

Golden raisins are generally dried in dehydrators with controlled temperature and humidity, which allows them to retain a lighter color and more moisture. They are often treated with sulfur dioxide after drying.

Black Corinth or Zante currants are small, sometimes seedless, raisins that are much darker and have a tart, tangy flavor. They are usually called currants.^[3] Muscat raisins are larger and sweeter than other varieties.

Grapes used to produce raisins in the Middle East and Asia include the large black monukka (or manucca) grapes that produce large raisins.^[4]

Processing

Drying raisins at Gata de Gorgos, Video by Valencian Museum of Ethnology.

Raisins are produced commercially by drying harvested grape berries. For a grape berry to dry, water inside the grape must be removed completely from the interior of the cells onto the surface of the grape where the water droplets can evaporate.^[5] However, this diffusion process is very difficult because the grape skin contains wax in its cuticle, which prevents the water from passing through.^[5] In addition to this, the physical and chemical mechanisms located on the outer layers of the grape are adapted to prevent water loss.^[6] The three steps to commercial raisin production include pre-treatment, drying, and post-drying processes.^[5]

Pre-treatment

Pre-treatment is a necessary step in raisin production to ensure the increased rate of water removal during the drying process.^[5] A faster water removal rate decreases the rate of browning and helps to produce more desirable raisins.^[5] The historical method of completing this process was developed in the Mediterranean and Asia Minor areas by using a dry emulsion cold dip made of potassium carbonate and ethyl esters of fatty acids.^[6] This dip was shown to increase the rate of water loss by two- to three-fold.^[6]

Recently, new methods have been developed such as exposing the grapes to oil emulsions or dilute alkaline solutions. These methods can encourage water transfer to the outer surface of grapes which helps to increase the efficiency of the drying process.^[5]

Drying

The three types of drying methods are: sun drying, shade drying, and mechanical drying.^[5] Sun drying is an inexpensive process; however, environmental contamination, insect infections, and microbial deterioration can occur and the resulting raisins are often of low quality. Additionally, sun drying is a slow process and may not produce the most desirable raisins.^[5]

Mechanical drying can be done in a safer and more controlled environment where rapid drying is guaranteed. One type of mechanical drying is to use microwave drying. Water molecules in the grapes absorb microwave energy resulting in rapid evaporation. Microwave drying produces puffed raisins.^[5]

Post-drying processes

After the drying process is complete, raisins are sent to processing plants where they are cleaned with water to remove any foreign objects that may have become embedded during the drying process.^[5] Stems and off-grade raisins are also removed. The washing process may cause rehydration, so another drying step is completed after washing to ensure that the added moisture has been removed.^[5]

All steps in the production of raisins are very important in determining the quality of raisins. Sometimes sulfur dioxide is applied to raisins after the pre-treatment step and before drying to decrease the rate of browning caused by the reaction between polyphenol oxidase and phenolic compounds. Sulfur dioxide also helps to preserve flavor and prevent the loss of certain vitamins during the drying process.^[6]

Production

Estimated global production of raisins in 2023–24 was 1.1 million tonnes, led by Turkey, China, Iran, and the United States as the largest producers.^[9]

Nutrition

Raisins are 15% water, 79% carbohydrates (including 4% fiber), and 3% protein, and contain negligible fat (table). In a reference amount of 100 grams (3.5 oz), raisins supply 299 kilocalories and moderate amounts (10–19% DV) of the Daily Value (DV) of riboflavin, vitamin B6, and several dietary minerals rich in content (above 20% DV), including potassium and copper (table).

Toxicity in animals

Raisins can cause kidney failure in both cats and dogs. The cause of this is not known.^[10]

Gallery

Common commercial raisins
Chunche, ventilated sheds for drying grapes into raisins in Xinjiang
Raisins offered for sale at a market in Taliparamba, India

References

^ bakeryandsnacks.com. "Raisin the stakes in 2023: South African sultanas take the lead as the New Year ingredient". bakeryandsnacks.com. Retrieved 20 March 2023.
^ Dom Costello. "Kew Gardens explanation". Royal Botanic Gardens, Kew. Archived from the original on 5 September 2012. Retrieved 16 January 2013.
^ ^a ^b ^c ^d Harper, Douglas. "raisin". Online Etymology Dictionary.
^ "Types of Raisins: Currants, Golden Seedless, and More". Berkeley Wellness. Remedy Health Media. Archived from the original on 21 September 2017. Retrieved 20 September 2017.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Esmaiili, M.; Sotudeh-Gharebagh, R.; Cronin, K.; Mousavi, M. A. E.; Rezazadeh, G. (2007). "Grape Drying: A Review". Food Reviews International. 23 (3): 257. doi:10.1080/87559120701418335. S2CID 83652015.
^ ^a ^b ^c ^d Christensen, L.P., and Peacock, W.L. (20 April 2013) "The Raisin Drying Process" Archived 12 June 2013 at the Wayback Machine. Raisin Production Manual, University of California at Davis.
^ United States Food and Drug Administration (2024). "Daily Value on the Nutrition and Supplement Facts Labels". FDA. Archived from the original on 27 March 2024. Retrieved 28 March 2024.
^ National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review the Dietary Reference Intakes for Sodium and Potassium (2019). "Chapter 4: Potassium: Dietary Reference Intakes for Adequacy". In Oria, Maria; Harrison, Meghan; Stallings, Virginia A. (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). pp. 120–121. doi:10.17226/25353. ISBN 978-0-309-48834-1. PMID 30844154. Retrieved 5 December 2024.
^ "Estimated world raisin/sultana/currant production 2023–2024". International Nut and Dried Fruit Council. 2023. Retrieved 11 November 2024.
^ DiBartola, Stephen P. (2012). Fluid, electrolyte, and acid-base disorders in small animal practice (4th ed.). St. Louis, Mo.: Saunders/Elsevier. p. 155. ISBN 978-1-4377-0654-3.