Sunflower seed
The sunflower seed is the fruit of the sunflower (Helianthus annuus). There are three types of commonly used sunflower seeds: linoleic (most common), high oleic, and sunflower oil seeds. Each variety has its own unique levels of monounsaturated, saturated, and polyunsaturated fats. The information in this article refers mainly to the linoleic variety.
For commercial purposes, sunflower seeds are usually classified by the pattern on their husks. If the husk is solid black, the seeds are called black oil sunflower seeds. The crops may be referred to as oilseed sunflower crops. These seeds are usually pressed to extract their oil. Striped sunflower seeds are primarily eaten as a snack food; as a result, they may be called confectionery sunflower seeds.
The term "sunflower seed" is actually a misnomer when applied to the seed in its pericarp (hull). Botanically speaking, it is a cypsela. When dehulled, the edible remainder is called the sunflower kernel or heart.
Production
| Sunflower seed production – 2018 | |
|---|---|
| Country | Production (millions of tonnes) |
 | |
 | |
 | |
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In 2018, global production of sunflower seeds was 52 million tonnes, led by Ukraine with 27% and Russia with 25% of the world total (table). Argentina, Romania, and China also contributed significant volumes.
Usage
| Nutritional value per 100 g (3.5 oz) | |
|---|---|
| Energy | 2,445 kJ (584 kcal) |
20 g | |
| Sugars | 2.62 g |
| Dietary fiber | 8.6 g |
51.46 g | |
| Saturated | 4.455 g |
| Monounsaturated | 18.528 g |
| Polyunsaturated | 23.137 g |
20.78 g | |
| Vitamins | Quantity %DV† |
| Thiamine (B1) | 129% 1.48 mg |
| Riboflavin (B2) | 30% 0.355 mg |
| Niacin (B3) | 56% 8.335 mg |
| Pantothenic acid (B5) | 23% 1.13 mg |
| Vitamin B6 | 103% 1.345 mg |
| Folate (B9) | 57% 227 μg |
| Choline | 11% 55.1 mg |
| Vitamin C | 2% 1.4 mg |
| Vitamin E | 234% 35.17 mg |
| Minerals | Quantity %DV† |
| Calcium | 8% 78 mg |
| Iron | 40% 5.25 mg |
| Magnesium | 92% 325 mg |
| Manganese | 93% 1.95 mg |
| Phosphorus | 94% 660 mg |
| Potassium | 14% 645 mg |
| Sodium | 1% 9 mg |
| Zinc | 53% 5 mg |
| Other constituents | Quantity |
| Water | 4.7 g |
| |
| †Percentages are roughly approximated using US recommendations for adults. | |
Sunflower seeds are more commonly eaten as a snack than as part of a meal. They can also be used as garnishes or ingredients in various recipes. The seeds may be sold as in-shell seeds or dehulled kernels. The seeds can also be sprouted and eaten in salads.
When in-shell seeds are processed, they are first dried. Afterwards, they may also be roasted or dusted with salt or flour for preservation of flavor.
Sunflower seeds sold by the bag are either eaten "plain" (salted only) or with a variety of flavorings added by the maker including barbecue, pickle, hot sauce, bacon, ranch, and nacho cheese as well as others.
In-shell, sunflower seeds are particularly popular in Mediterranean, Eastern European, and Asian countries where they can be bought freshly roasted and are commonly consumed as street food, the hull being cracked open with the teeth and spat out, while in many countries, they can be bought freshly packed in various roasted flavors. In the United States, they are commonly eaten by baseball players as an alternative to chewing tobacco.[2]
Mechanically dehulled kernels are sold raw or roasted and are sometimes added to bread and other baked goods for their flavor. Sunflower seed brittle is produced by embedding the kernels in hard sugar candy. In Belarus, Russia and Ukraine, roasted ground seeds are used to make a type of halva. There is also sunflower butter, similar to peanut butter, but using sunflower seeds instead of peanuts, which is a common substitute in schools for children with nut allergies. Apart from human consumption, sunflower seeds are also used as food for pets and wild birds in boxes and small bags.
Nutrition
In a 100-gram serving, dried whole sunflower seeds provide 584 calories and are composed of 5% water, 20% carbohydrates, 51% total fat and 21% protein (table). The seeds are a rich source (20% or higher of the Daily Value, DV) of protein (42% DV), dietary fiber (36% DV), many B vitamins (23–129% DV) and vitamin E (234% DV). The seeds also contain high levels of dietary minerals, including magnesium, manganese, phosphorus, iron and zinc (40–94% DV).
Half of a 100-gram serving is fat, mainly monounsaturated and polyunsaturated fats, principally linoleic acid. Additionally, the seeds contain phytosterols which may contribute toward lower levels of blood cholesterol.[3]
Pressed oil
Over the past decades sunflower oil has become popular worldwide. The oil may be used as is, or may be processed into polyunsaturated margarines. The oil is typically extracted by applying great pressure to the sunflower seeds and collecting the oil. The protein-rich cake remaining after the seeds have been processed for oil is used as a livestock feed.
The original sunflower oil (linoleic sunflower oil) is high in polyunsaturated fatty acids (about 68% linoleic acid) and low in saturated fats, such as palmitic acid and stearic acid. However, various hybrids have been developed to alter the fatty acid profile of the crop for various purposes.[4][5]
Hulls
The hulls, or shells, mostly composed of cellulose, decompose slowly and may be burned as biomass fuel.[6] Sunflower hulls of the cultivated sunflower (Helianthus annuus) contain allelopathic compounds which are toxic to grasses and the vast majority of cultivated garden plants.[7][8] Only a small number of garden plants, such as day lilies, are unaffected by the allelopathic compounds found in sunflower hulls.[7][8]
References
- "Crops/World Regions/Production Quantity/2018 from pick lists for sunflower seeds". UN Food and Agriculture Organization Corporate Statistical Database (FAOSTAT). 2019. Retrieved 12 February 2020.
- Blount R (6 October 1980). "The Seeds Of Content". Sports Illustrated.
- "Sunflower Seeds, Pistachios Among Top Nuts For Lowering Cholesterol". Science Daily. 7 December 2005. Retrieved 27 March 2011.
- "National Sunflower Association : Sunflower Oil". Sunflowernsa.com. Retrieved 27 March 2011.
- "Sunflower Seeds and Oil | Food Source Information". fsi.colostate.edu. Retrieved 19 July 2019.
- Zabaniotou AA, Kantarelis EK, Theodoropoulos DC (May 2008). "Sunflower shells utilization for energetic purposes in an integrated approach of energy crops: laboratory study pyrolysis and kinetics" (PDF). Bioresource Technology. 99 (8): 3174–81. doi:10.1016/j.biortech.2007.05.060. PMID 17651967.
- Leather GR (1987). "Weed control using allelopathic sunflowers and herbicide". Plant and Soil. 98: 17–23. doi:10.1007/BF02381723.
- Ciarka D, Gawronska H, Szawlowska U, Gawronski SW (2009). "Allelopathic potential of sunflower. I. Effects of genotypes, organs and biomass partitioning". Allelopathy Journal. 23 (1): 95–109.
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