Sprouting

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Mixed bean sprouts (shoots) Organic mixed beans shoots.jpg
Mixed bean sprouts (shoots)
Melon seeds sprouting Cantaloupe seeds sprouting.jpg
Melon seeds sprouting
Buckwheat sprouts 1-day-old buckwheat sprouts.jpg
Buckwheat sprouts

Sprouting is the natural process by which seeds or spores germinate and put out shoots, and already established plants produce new leaves or buds, or other structures experience further growth.

Contents

In the field of nutrition, the term signifies the practice of germinating seeds (for example, mung beans or sunflower seeds) to be eaten raw or cooked, which is considered [1] more nutritious.

Suitable seeds

Soybean sprout next to a smaller mung bean sprout Tauge kasar vs tauge halus.jpg
Soybean sprout next to a smaller mung bean sprout
Sprouts sold as snacks during Kumbh Mela festival 2019 Jan 18 - Kumbh Mela - Sprouts.jpg
Sprouts sold as snacks during Kumbh Mela festival

All viable seeds can be sprouted, but some sprouts, such as kidney beans, should not be eaten raw. [2]

Bean sprouts are a common ingredient across the world. They are particularly common in Eastern Asian cuisine. It typically takes one week for them to become fully grown. The sprouted beans are more nutritious than the original beans, and they require much less cooking time. There are two common types of bean sprouts:

Common sprouts used as food include:

Although whole oats can be sprouted, oat groats sold in food stores, which are dehulled and have been steamed or roasted to prevent rancidity, will not sprout. Whole oats may have an indigestible hull which makes them difficult or even unfit for human consumption.[ citation needed ] In the case of rice, the husk of the paddy is removed before sprouting. Brown rice is widely used for germination in Japan and other countries, becoming germinated brown rice. Quinoa in its natural state is very easy to sprout, but when polished, or pre-cleaned of its saponin coating (becoming whiter), it loses its power to germinate.

Sprouts of the family Solanaceae (tomato, potato, paprika, and aubergine/eggplant) and the family Polygonaceae (rhubarb) cannot be eaten raw, as they can be poisonous. [4] Some sprouts can be cooked to remove the relevant toxin, while others cannot.[ citation needed ][ example needed ]

With all seeds, care should be taken that they are intended for sprouting or human consumption, rather than sowing. Seeds intended for sowing may be treated with toxic chemical dressings. Several countries, such as New Zealand, require that some varieties of imported edible seed be heat-treated, thus making it impossible for them to sprout.[ citation needed ]

The germination process

Sprouting mung beans in a glass sprouter jar with a green plastic sieve-lid Sprouting mung beans in a jar.jpg
Sprouting mung beans in a glass sprouter jar with a green plastic sieve-lid

The germination process takes a few days and can be done at home manually, as a semi-automated process, or industrially on a large scale for commercial use. The time it takes for germination depends on the type of seed and their environment.

Typically the seeds are first rinsed to remove soil, dirt and the mucilaginous substances produced by some seeds when they come in contact with water. Then they are soaked for from 20 minutes to 12 hours, depending on the type and size of the seed. The soaking increases the water content in the seeds and brings them out of quiescence. After draining and then rinsing seeds at regular intervals, the seeds then germinate, or sprout.

For home sprouting, the seeds are soaked (big seeds) or moistened (small), then left at room temperature (13 to 21 °C or 55 to 70 °F) in a sprouting vessel. Many different types of vessels can be used as a sprouting vessel. One type is a simple glass jar with a piece of cloth or nylon window screen secured over its rim. Tiered clear-plastic sprouters are commercially available, allowing a number of crops to be grown simultaneously. By staggering sowings, a constant supply of young sprouts can be ensured. Any vessel used for sprouting must allow water to drain from it, because sprouts that sit in water will rot quickly. The seeds swell, may stick to the sides of the jar, and begin germinating within a day or two.

Another sprouting technique is to use a pulse drip method. The photo below on the right shows crimson clover sprouts grown on 3 mm (1⁄8 in) urethane foam mats. It is a one-way watering system with micro-sprinklers providing intermittent pulses of fresh water to reduce the risk of bacterial cross-contamination with Salmonella and E. coli during the sprouting process.

Crimson clover sprouts grown on 3 mm (1/8 in) urethane foam mats with a pulse drip technique. Four micro-sprinklers cycle pulsing continuously over a 7-day period, each putting out about 2 L (1/2 US gal) per hour. The four micro-sprinklers were each fitted with an LPD to keep the lines fully charged between pulses. Crimson clover sprouts.jpg
Crimson clover sprouts grown on 3 mm (1⁄8 in) urethane foam mats with a pulse drip technique. Four micro-sprinklers cycle pulsing continuously over a 7-day period, each putting out about 2 L (1⁄2 US gal) per hour. The four micro-sprinklers were each fitted with an LPD to keep the lines fully charged between pulses.

Sprouts are rinsed two to four times a day, depending on the climate and the type of seed, to provide them with moisture and prevent them from souring. Each seed has its own ideal sprouting time. After three to five days the sprouts will have grown 5 to 8 centimetres (2 to 3 in) in length and will be suitable for consumption. If left longer they will begin to develop leaves, and are then known as baby greens. A popular baby green is a sunflower after 7–10 days. Refrigeration can be used as needed to slow or halt the growth process of any sprout.

Common causes for sprouts becoming inedible:

Mung beans can be sprouted either in light or dark conditions. Those sprouted in the dark will be crisper in texture and whiter, as in the case of commercially available Chinese Bean Sprouts, but these have less nutritional content than those grown in partial sunlight.[ citation needed ] Growing in full sunlight is not recommended, because it can cause the beans to overheat or dry out. Subjecting the sprouts to pressure, for example, by placing a weight on top of them in their sprouting container, will result in larger, crunchier sprouts similar to those sold in grocery stores.

A very effective way to sprout beans like lentils or azuki is in colanders. Soak the beans in water for about 8 hours then place in the colander. Wash twice a day. The sprouted beans can be eaten raw or cooked.

Sprouting is also applied on a large scale to barley as a part of the malting process. Malted barley is an important ingredient in beer and is used in large quantities. Most malted barley is widely distributed among retail sellers in North America.

Many varieties of nuts, such as almonds and peanuts, can also be started in their growth cycle by soaking and sprouting, although because the sprouts are generally still very small when eaten, they are usually called "soaks".

Nutrition

Sprouts growing in a verrine Verrine.jpg
Sprouts growing in a verrine
Mung bean sprouts in a bowl, grown without light to maintain its pale colour and reduce bitterness. Moyashi.jpg
Mung bean sprouts in a bowl, grown without light to maintain its pale colour and reduce bitterness.

Sprouts can be germinated at home or produced industrially. They are a prominent ingredient of a raw food diet and are common in Eastern Asian cuisine.

Raw lentils contain lectins which can be reduced by sprouting or cooking. A downside to consuming raw sprouts is that the process of germinating seeds can also be conducive to harmful bacterial growth.

Sprouts are rich in digestible energy, vitamins, minerals, amino acids, proteins, and phytochemicals, as these are necessary for a germinating plant to grow. [6] [7] [8] [9]

Protein

"Very complex qualitative changes are reported to occur during soaking and sprouting of seeds. The conversion of storage proteins of cereal grains into albumins and globulins during sprouting may improve the quality of cereal proteins. Many studies have shown an increase in the content of the amino acid lysine with sprouting." [10]

"An increase in proteolytic activity during sprouting is desirable for nutritional improvement of cereals because it leads to hydrolysis of prolamins and the liberated amino acids such as glutamic and proline are converted to limiting amino acids such as lysine." [10]

Fiber

"In sprouted barley, crude fiber, a major constituent of cell walls, increases both in percentage and real terms, with the synthesis of structural carbohydrates, such as cellulose and hemicellulose." [11] [12]

Vitamins

Sprouting treatment of cereal grains may improve vitamin value, especially the B-group vitamins. Certain vitamins such as α-tocopherol (vitamin-E) and β-carotene (vitamin-A precursor) are produced during the growth process. [11]

Health concerns

Bacterial infection

FDA health warning on a sprouts package Sprout Warning.jpg
FDA health warning on a sprouts package

Commercially grown sprouts have been associated with multiple outbreaks of harmful bacteria, including salmonella and toxic forms of Escherichia coli . [13] Such infections, which are so frequent in the United States that investigators call them "sproutbreaks", [13] may be a result of contaminated seeds or of unhygienic production with high microbial counts. [14] [15] Sprout seeds can become contaminated in the fields where they are grown, and sanitizing steps may be unable to kill bacteria hidden in damaged seeds. [13] A single surviving bacterium in a kilogram of seed can be enough to contaminate a whole batch of sprouts, according to the FDA. [13]

To minimize the impact of the incidents and maintain public health, both the U.S. Food and Drug Administration (FDA) and Health Canada issued industry guidance on the safe manufacturing of edible sprouts and public education on their safe consumption. [16] [17] There are also publications for hobby farmers on safely growing and consuming sprouts at home. [18] [19] The recommendations include development and implementation of good agricultural practices and good manufacturing practices in the production and handling of seeds and sprouts, seed disinfection treatments, and microbial testing before the product enters the food supply.

In June 2011, contaminated fenugreek sprouts (grown from seed from Egypt) in Germany was identified as the source of the 2011 E. coli O104:H4 outbreak which German officials had at first wrongly blamed on cucumbers from Spain and then on mung bean sprouts. [13] In addition to Germany, where 3,785 cases and 45 deaths had been reported by the end of the outbreak, [20] [21] a handful of cases were reported in several countries including Switzerland, [21] Poland, [21] the Netherlands, [21] Sweden, [21] Denmark, [21] the UK, [21] [22] Canada, [21] and the USA. [23] Virtually all affected people had been in Germany shortly before becoming ill.

Anti-nutritional factors

Some legumes, including sprouts, can contain toxins or anti-nutritional factors, which can be reduced by soaking, sprouting and cooking. Joy Larkcom advises that to be on the safe side "one shouldn’t eat large quantities of raw legume sprouts on a regular basis, no more than about 550g (20oz) daily". [24]

Phytic acid, an anti-nutritional factor, occurs primarily in the seed coats and germ tissue of plant seeds. It forms insoluble or nearly insoluble compounds with many metal ions, including those of calcium, iron, magnesium, and zinc, reducing their dietary availability. Diets high in phytic acid and poor in these minerals produce mineral deficiency in experimental animals (Gontzea and Sutzescu, 1968, [25] as cited in Chavan and Kadam, 1989). [10] The latter authors state that the sprouting of cereals has been reported to decrease levels of phytic acid. Similarly, Shipard (2005) [26] states that enzymes of germination and sprouting can help decrease the detrimental substances such as phytic acid. However, the amount of phytic acid reduction from soaking is only marginal, and not enough to fully counteract its anti-nutrient effects. [27]

Canavanine

Alfalfa seeds and sprouts contain L-canavanine, which can cause lupus-like disease in primates. [28]

European Union regulations

In order to prevent incidents like the 2011 EHEC epidemic, on 11 March 2013, the European Commission issued three new, tighter regulations.

Types of germination

See also

Related Research Articles

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References

  1. ↑ Chevan, JK (1989). "Nutritional improvement of cereals by sprouting". Crit Rev Food Sci Nutr. 28 (5): 401–437. doi:10.1080/10408398909527508. PMID   2692609 . Retrieved 22 March 2022.
  2. ↑ Perkins, Sharon (2019). "Are kidney beans toxic?" . Retrieved March 14, 2021.
  3. ↑ "How to Malt Barley". wikiHow. March 29, 2019. Retrieved March 14, 2021.
  4. ↑ Donald G. Barceloux (June 2009). "Potatoes, Tomatoes, and Solanine Toxicity (Solanum tuberosum L., Solanum lycopersicum L.)". Disease-a-Month. 55 (6): 391–402. doi:10.1016/j.disamonth.2009.03.009. PMID   19446683.(subscription required)
  5. ↑ "Super LPD". Archived from the original on 30 June 2011.
  6. ↑ "Plant-based nutrition". Spring 2002. Archived from the original on 2004-07-28. Retrieved 2007-11-14.
  7. ↑ Dikshit, Madhurima; Ghadle, Mangala (2003). "Effect of sprouting on nutrients, antinutrients and in vitro digestibility of the MACS-13 soybean variety". Plant Foods for Human Nutrition. 58 (3): 1–11. doi:10.1023/B:QUAL.0000040357.70606.4c. S2CID   84496987.
  8. ↑ Rumiyati; Jayasena, Vijay; James, Anthony P. (13 August 2013). "Total Phenolic and Phytosterol Compounds and the Radical Scavenging Activity of Germinated Australian Sweet Lupin Flour". Plant Foods for Human Nutrition. 68 (4): 352–357. doi:10.1007/s11130-013-0377-6. PMID   23943234. S2CID   12683591.
  9. ↑ Świeca, Michał; Gawlik-Dziki, Urszula; Kowalczyk, Dariusz; Złotek, Urszula (June 2012). "Impact of germination time and type of illumination on the antioxidant compounds and antioxidant capacity of Lens culinaris sprouts". Scientia Horticulturae. 140: 87–95. doi:10.1016/j.scienta.2012.04.005.
  10. 1 2 3 4 5 Chavan, J. K.; Kadam, S. S.; Beuchat, Larry R. (January 1989). "Nutritional improvement of cereals by sprouting". Critical Reviews in Food Science and Nutrition. 28 (5): 401–437. doi:10.1080/10408398909527508. PMID   2692609.
  11. 1 2 Cuddeford, D. (1 September 1989). "Hydroponic grass". In Practice. 11 (5): 211–214. doi:10.1136/inpract.11.5.211. S2CID   219216512.
  12. ↑ Peer, DJ; Leeson (Dec 1985). "S". Animal Feed Science and Technology. 13 (3–4): 191–202. doi:10.1016/0377-8401(85)90022-7.
  13. 1 2 3 4 5 Neuman, William (10 June 2011). "The Poster Plant of Health Food Can Pack Disease Risks". New York Times . Retrieved 11 June 2011.
  14. ↑ Breuer, Thomas; et al. "A Multistate Outbreak of Escherichia coli O157:H7 Infections Linked to Alfalfa Sprouts Grown from Contaminated Seeds" . Retrieved 19 November 2007.
  15. ↑ Gabriel, Alonzo A.; Berja, M; Estrada, A; Lopez, M; Nery, J; Villaflor, E; et al. (2007). "Microbiology of retail mung bean sprouts vended in public markets of National Capital Region, Philippines". Food Control. 18 (10): 1307–1313. doi:10.1016/j.foodcont.2006.09.004.
  16. ↑ Food and Drug Administration (May 17, 2005). "Transcript of Proceedings of Public Meeting on Sprout Safety". Food and Drug Administration . Retrieved 19 November 2007.
  17. ↑ Health Canada (2007-01-15). "Sprouted Beans and Seeds" . Retrieved 19 November 2007.
  18. ↑ Harrison, H. C. "Growing Edible Sprouts at Home" (PDF). Retrieved 5 September 2016.
  19. ↑ Suslow, Trevor V.; Linda J. Harris. "Growing Seed Sprouts at Home" (PDF). Retrieved 23 November 2007.
  20. ↑ Shiga toxin-producing E. coli (STEC): Update on outbreak in the EU, 27 July 2011 Archived 4 October 2011 at the Wayback Machine
  21. 1 2 3 4 5 6 7 8 "Outbreak of Shiga toxin-producing E. coli in Germany (22 June 2011, 11:00)". ECDC . 22 June 2011. Archived from the original on 30 June 2011. Retrieved 22 June 2011.
  22. ↑ "E. coli cucumber scare: Russia announces import ban". BBC News Online. 30 May 2011. Archived from the original on 31 May 2011. Retrieved 30 May 2011.
  23. ↑ "E. Two in U.S. infected in German E. coli outbreak". NBC News Online. 31 May 2011. Archived from the original on February 11, 2020. Retrieved 2 June 2011.
  24. ↑ Larkcom, Joy (1995). Salads for small gardens. Illustrated by Elizabeth Douglas (2nd ed.). [London]: Hamlyn. ISBN   978-0-600-58509-1.
  25. ↑ Natural Antinutritive Substances in Foodstuffs and Forages (1 ed.). S. Karger; 1 edition (August 28, 1968). 28 August 1968. p. 184. ISBN   978-3805508568.
  26. ↑ Shipard, Isabell (2005). How can I grow and use sprouts as living food?. [Nambour, Qld.?]: David Stewart. ISBN   978-0975825204.
  27. ↑ Egli, I.; Davidsson, L.; Juillerat, M.A.; Barclay, D.; Hurrell, R.F. (November 2002). "The Influence of Soaking and Germination on the Phytase Activity and Phytic Acid Content of Grains and Seeds Potentially Useful for Complementary Feedin". Journal of Food Science. 67 (9): 3484–3488. doi:10.1111/j.1365-2621.2002.tb09609.x.
  28. ↑ Montanaro, A.; Bardana Jr, E. J. (May 1991). "Dietary amino acid-induced systemic lupus erythematosus". Rheum Dis Clin North Am. 17 (2): 323–32. doi:10.1016/S0889-857X(21)00573-1. PMID   1862241.
  29. ↑ Commission Implementing Regulation (EU) No 208/2013 European Commission, Retrieved 04-20-2013
  30. ↑ Commission Regulation (EU) No 209/2013 European Commission, Retrieved 04-20-2013
  31. ↑ Commission Regulation (EU) No 211/2013 European Commission, Retrieved 04-20-2013

Bibliography

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