Parboiled rice

Last updated
Parboiled rice Riso parboiled.jpg
Parboiled rice
Woman preparing parboiled rice in Nigeria A woman prepares parboiled rice.jpg
Woman preparing parboiled rice in Nigeria
Prepared parboiled rice Parboiled rice with chicken, peppers, cucurbita, peas and tomato.jpg
Prepared parboiled rice

Parboiled rice, also called converted rice, easy-cook rice, [1] sella rice, and miniket (as predominantly called in West Bengal and Odisha in India, and in Bangladesh) is rice that has been partially boiled in the husk. The three basic steps of parboiling are soaking, steaming and drying. [2] These steps make the rice easier to process by hand, while also boosting its nutritional profile, changing its texture, and making it more resistant to weevils. [3] The treatment is practiced in many other parts of the world. [4]

Contents

Parboiling drives nutrients, especially thiamine, from the bran to the endosperm, hence parboiled white rice is mostly nutritionally similar to brown rice. [5] Given the pale tan color that results from these bran components, parboiled rice is sometimes called saffron sella.

Process and chemistry

The starches in parboiled rice become gelatinized, then retrograded after cooling. Through gelatinization, amylose molecules leach out of the starch granule network and diffuse into the surrounding aqueous medium outside the granules [6] which, when fully hydrated are at maximum viscosity. [7] The parboiled rice kernels should be translucent when wholly gelatinized. Cooling brings retrogradation whereby amylose molecules re-associate with each other and form a tightly packed structure. This increases the formation of type-3, resistant starch which can act as a prebiotic and benefit health in humans. [8] However, this also makes the kernels harder and glassier. Parboiled rice takes less time to cook and is firmer and less sticky. In North America parboiled rice is often partially or fully precooked before sale. Minerals such as zinc or iron are added, increasing their potential bio-availability in the diet.[ citation needed ]

Older methods

In older methods, clean paddy rice was soaked in cold water for 36–38 hours to give it a moisture content of 30–35%, after which the rice was put in parboiling equipment with fresh cold water and boiled until it began to split. The rice was then dried on woven mats, cooled and milled. [9] [ citation needed ]

Huzenlaub Process

In the 1910s German-British scientist Erich Gustav Huzenlaub (1888–1964) and the British scientist and chemist Francis Heron Rogers invented a form of parboiling which held more of the nutrients in rice, now known as the Huzenlaub Process. The whole grain is vacuum-dried, then steamed, followed by another vacuum drying and husking. This also makes the rice more resistant to weevils and lessens cooking time. [10]

Modern methods

In even later methods the rice is soaked in hot water, then steamed for boiling which only takes three hours rather than the twenty hours of traditional methods. These methods also yield a yellowish color in the rice, which undergoes less breakage when milled. [11]

Other variations on parboiling include high-pressure steaming and various ways of drying (dry-heat, vacuum, etc.) [12] [13]

Nutrition

Rice, brown, parboiled, dry, UNCLE BEN'S (#20042)
Nutritional value per 100 g (3.5 oz)
Energy 370 kcal (1,500 kJ)
78.68 g
Sugars 0.5 g
Dietary fiber 3.5 g
Fat
2.75 g
7.60 g
Vitamins Quantity
%DV
Thiamine (B1)
24%
0.277 mg
Riboflavin (B2)
8%
0.092 mg
Niacin (B3)
33%
4.973 mg
Vitamin B6
31%
0.407 mg
Folate (B9)
4%
14 μg
Vitamin K
1%
0.9 μg
Minerals Quantity
%DV
Calcium
1%
8 mg
Iron
9%
1.16 mg
Magnesium
28%
98 mg
Phosphorus
39%
275 mg
Potassium
5%
219 mg
Sodium
0%
6 mg
Zinc
21%
1.96 mg
Other constituentsQuantity
Water9.82 g
Percentages are roughly approximated using US recommendations for adults.
Source: USDA FoodData Central

Compared to brown rice, parboiling of rice incurs losses of thiamin, niacin, biotin, and pantothenic acid by approximately 70%, 28%, 49% and 25%, respectively. Compared to normal milling, which causes a near 65% loss of all these micronutrients, parboiling preserves more of them. [5] The specific loss depends on the process used by individual manufacturers: for the USDA #20042 sample, much less loss in these nutrients is observed. Fortification is common for parboiled rice in the United States. Depending upon the method used, levels of arsenic can increase or decrease significantly. [14]

An improved rice cooking approach to maximise arsenic removal while preserving nutrient elements Improved rice cooking approach to maximise arsenic removal while preserving nutrient elements.jpg
An improved rice cooking approach to maximise arsenic removal while preserving nutrient elements

A 2020 scientific study assessed multiple preparation procedures of rice for their capacity to reduce arsenic content and preserve nutrients, recommending a procedure involving parboiling and water absorption. [16] [15]

See also

Related Research Articles

<span class="mw-page-title-main">Starch</span> Glucose polymer used as energy store in plants

Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants for energy storage. Worldwide, it is the most common carbohydrate in human diets, and is contained in large amounts in staple foods such as wheat, potatoes, maize (corn), rice, and cassava (manioc).

<span class="mw-page-title-main">Tapioca</span> Starch extracted from cassava roots

Tapioca is a starch extracted from the storage roots of the cassava plant, a species native to the North and Northeast regions of Brazil, but whose use is now spread throughout South America. It is a perennial shrub adapted to the hot conditions of tropical lowlands. Cassava copes better with poor soils than many other food plants.

<span class="mw-page-title-main">Sago</span> Starch extracted from tropical palm stems

Sago is a starch extracted from the pith, or spongy core tissue, of various tropical palm stems, especially those of Metroxylon sagu. It is a major staple food for the lowland peoples of New Guinea and the Maluku Islands, where it is called saksak, rabia and sagu. The largest supply of sago comes from Southeast Asia, particularly Indonesia and Malaysia. Large quantities of sago are sent to Europe and North America for cooking purposes. It is traditionally cooked and eaten in various forms, such as rolled into balls, mixed with boiling water to form a glue-like paste (papeda), or as a pancake.

<span class="mw-page-title-main">Mochi</span> Japanese rice cake

Mochi, is a Japanese rice cake made of mochigome (もち米), a short-grain japonica glutinous rice, and sometimes other ingredients such as water, sugar, and cornstarch. The steamed rice is pounded into paste and molded into the desired shape. In Japan, it is traditionally made in a ceremony called mochitsuki. While eaten year-round, mochi is a traditional food for the Japanese New Year, and is commonly sold and eaten during that time.

<span class="mw-page-title-main">Bran</span> Hard outer layers of cereal grain

Bran, also known as miller's bran, is the hard layers of cereal grain surrounding the endosperm. It consists of the combined aleurone and pericarp. Corn (maize) bran also includes the pedicel. Along with the germ, it is an integral part of whole grains, and is often produced as a byproduct of milling in the production of refined grains.

<span class="mw-page-title-main">Chinese noodles</span> Noodles in Chinese cuisine

Chinese noodles vary widely according to the region of production, ingredients, shape or width, and manner of preparation. Noodles were invented in China, and are an essential ingredient and staple in Chinese cuisine. They are an important part of most regional cuisines within China, and other countries with sizable overseas Chinese populations.

<span class="mw-page-title-main">Amylopectin</span> Chemical compound

Amylopectin is a water-insoluble polysaccharide and highly branched polymer of α-glucose units found in plants. It is one of the two components of starch, the other being amylose.

Starch gelatinization is a process of breaking down of intermolecular bonds of starch molecules in the presence of water and heat, allowing the hydrogen bonding sites to engage more water. This irreversibly dissolves the starch granule in water. Water acts as a plasticizer.

<span class="mw-page-title-main">Nixtamalization</span> Procedure for preparing corn to eat

Nixtamalization is a process for the preparation of maize, or other grain, in which the grain is soaked and cooked in an alkaline solution, usually limewater, washed, and then hulled. The term can also refer to the removal via an alkali process of the pericarp from other grains such as sorghum.

<span class="mw-page-title-main">Puffed rice</span> Types of puffed grain made from rice

Puffed rice and popped rice are types of puffed grain made from rice commonly eaten in the traditional cuisines of Southeast Asia, East Asia, and South Asia. It has also been produced commercially in the West since 1904 and is popular in breakfast cereals and other snack foods.

<span class="mw-page-title-main">Outline of food preparation</span> Overview of and topical guide to food preparation

The following outline is provided as an overview of and topical guide to food preparation:

<span class="mw-page-title-main">Resistant starch</span> Dietary fiber

Resistant starch (RS) is starch, including its degradation products, that escapes from digestion in the small intestine of healthy individuals. Resistant starch occurs naturally in foods, but it can also be added as part of dried raw foods, or used as an additive in manufactured foods.

<span class="mw-page-title-main">Rice mill</span> Food-processing industry where paddy is processed

A rice mill is a food-processing facility where paddy is processed to rice to be sold in the market.

Instant rice is a white rice that is partly precooked and then is dehydrated and packed in a dried form similar in appearance to that of regular white rice. That process allows the product to be later cooked as if it were normal rice but with a typical cooking time of 5 minutes, not the 20–30 minutes needed by white rice. This process was invented by Ataullah K. Ozai‐Durrani in 1939 and mass-marketed by General Foods starting in 1946 as Minute Rice, which is still made.

<span class="mw-page-title-main">Matta rice</span> Indigenous variety of rice grown in Palakkad district of Kerala, India

Matta rice is an indigenous variety of rice grown in Udupi and Dakshina Kannada districts of Karnataka, and Palakkad district of Kerala, India. It is known for its coarseness and health benefits. It is popular in Kerala and coastal Karnataka in India and Sri Lanka where it is used on a regular basis for idlies, appams and plain rice; it is different from brown rice.

<span class="mw-page-title-main">Instant noodles</span> Noodles sold in a precooked and dried block with flavoring

Instant noodles, or instant ramen, is a type of food consisting of noodles sold in a precooked and dried block with flavoring powder and/or seasoning oil. The dried noodle block was originally created by flash-frying cooked noodles, and this is still the main method used in Asian countries; air-dried noodle blocks are favored in Western countries. Dried noodle blocks are designed to be cooked or soaked in boiling water before eating. Ramen, a Japanese adaptation of Chinese noodle soup, is sometimes used as a descriptor for instant noodle flavors by some Japanese manufacturers. It has become synonymous in the United States with all instant noodle products.

In agriculture, grain quality depends on the use of the grain. In ethanol production, the chemical composition of grain such as starch content is important, in food and feed manufacturing, properties such as protein, oil and sugar are significant, in the milling industry, soundness is the most important factor to consider when it comes to the quality of grain. For grain farmers, high germination percentage and seed dormancy are the main features to consider. For consumers, properties such as color and flavor are most important.

<span class="mw-page-title-main">Puffcorn</span> Puffed or extruded corn snacks

Puffcorn or corn puffs are puffed or extruded corn snacks made with corn meal, which can be baked or fried.

<span class="mw-page-title-main">Rice-cooking utensils</span>

Rice-cooking utensils are tools used for cooking rice and similar foods.

Rice is commonly consumed as food around the world. It occurs in long-, medium-, and short-grained types. It is the staple food of over half the world's population.

References

  1. "Types of rice – Rice Association". www.riceassociation.org.uk. Archived from the original on 25 November 2020.
  2. Miah, M. A. Kaddus; Haque, Anwarul; Douglass, M. Paul; Clarke, Brian (2002). "Parboiling of rice. Part II: Effect of hot soaking time on the degree of starch gelatinization". International Journal of Food Science and Technology. 37 (5): 539–545. doi:10.1046/j.1365-2621.2002.00611.x.
  3. Kik, M.C.; Williams, R.R. (June 1945). "The Nutritional Improvement of White Rice". Bulletin of the National Research Council. 112: 61–.
  4. Pillaiyar, P. (1981). Household parboiling of parboiled rice. Kishan World, 8, 20–21.
  5. 1 2 Kyritsi, A.; Tzia, C.; Karathanos, V.T. (January 2011). "Vitamin fortified rice grain using spraying and soaking methods". LWT – Food Science and Technology. 44 (1): 312–320. doi: 10.1016/j.lwt.2010.06.001 .
  6. Hermansson, Anne-Marie; Svegmark, Karin (November 1996). "Developments in the understanding of starch functionality". Trends in Food Science & Technology. 7 (11): 345–353. doi:10.1016/S0924-2244(96)10036-4.
  7. Eliasson, A.-C. (1986). "Viscoelastic behaviour during the gelatinization of starch". Journal of Texture Studies. 17 (3): 253–265. doi:10.1111/j.1745-4603.1986.tb00551.x.
  8. Helbig E, Días AR, Tavares RA, Schirmer MA, Elias MC (June 2008). "Arroz parboilizado efeito na glicemia de ratos Wistar" [The effect of parboiled rice on glycemia in Wistar rats]. Archivos Latinoamericanos de Nutricion (in Portuguese). 58 (2): 149–55. PMID   18833992.
  9. Bal, S.; Ojha, T.P. (1975). "Determination of biological maturity and effect of harvesting and drying conditions on milling quality of paddy". Journal of Agricultural Engineering Research. 20 (4): 353–361. doi:10.1016/0021-8634(75)90072-4.
  10. USpatent 2358251,Huzenlaub Erich GustavRogers Francis Heron,"Process for the treatment of rice and other cereals",issued 1944-09-12
  11. Ituen, E.U.U.; Ukpakha, A.C. (2011). "Improved method of parboiling paddy for better quality rice" (PDF). World Journal of Applied Science and Technology. 3 (1): 31–40. ISSN   2141-3290. Archived from the original (PDF) on June 17, 2020.
  12. Müller-Fischer, Nadina (2013). "Nutrient-focused Processing of Rice". Agricultural sustainability: progress and prospects in crop research. Academic Press. pp. 197–220. doi:10.1016/B978-0-12-404560-6.00010-1. ISBN   978-0-12-404560-6.
  13. Arendt, Elke K.; Zannini, Emanuele (2013). "Rice processing". Cereal grains for the food and beverage industries. Woodhead Pub. doi:10.1533/9780857098924.114. ISBN   978-0-85709-413-1.
  14. Rahman, Habibur; Carey, Manus; Hossain, Mahmud; Savage, Laurie; Islam, M. Rafiqul; Meharg, Andrew A. (2019). "Modifying the Parboiling of Rice to Remove Inorganic Arsenic, While Fortifying with Calcium". Environmental Science & Technology. 53 (9): 5249–5255. Bibcode:2019EnST...53.5249R. doi:10.1021/acs.est.8b06548. PMID   30993982. S2CID   119559479.
  15. 1 2 Menon, Manoj; Dong, Wanrong; Chen, Xumin; Hufton, Joseph; Rhodes, Edward J. (29 October 2020). "Improved rice cooking approach to maximise arsenic removal while preserving nutrient elements". Science of the Total Environment. 755 (Pt 2): 143341. doi: 10.1016/j.scitotenv.2020.143341 . ISSN   0048-9697. PMID   33153748. CC-BY icon.svg Available under CC-BY 4.0.
  16. "New way of cooking rice removes arsenic and retains mineral nutrients, study shows". phys.org. Retrieved 10 November 2020.