Quinoa: Botany, Production and Uses
By Atul Bhargava, Didier Bazile, Shilpi Srivastava and
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About this ebook
* Timely publication – The year 2013 has been declared "The International Year of the Quinoa" (IYQ), recognizing the Andean indigenous peoples, who have maintained, controlled, protected and preserved quinoa as food for present and future generations thanks to their traditional knowledge and practices of living well in harmony with mother earth and nature.
* Covers the history, phylogeny and systematics, botany and agrotechnology
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Quinoa - Atul Bhargava
1 Introduction
There are an estimated 7000 plant species that have been used as crop plants at some point in human history (FAO, 1998). However, today only 150 plant species are cultivated; just 12 of these provide approximately 75% of the world’s food and four produce over 50% of the world’s food (Bermejo and León, 1994). Prescott-Allen and Prescott-Allen (1990) state that common figures range from seven plant species providing 75% of human nutrition to 30 plant species providing 95% of human nutrition. These commonly utilized crops are intensively cultivated and require farm mechanization and increased inputs in the form of labour, high-yielding varieties, chemical fertilizers and pesticides (Bhargava et al., 2008, 2012). These accelerated inputs have resulted in intolerable pressure on fragile agroecosystems. Modern agriculture has increased homogeneity and mono-crop cultivation, resulting in loss of agrobiodiversity and frequent crop losses due to infestation by pathogens. The need of present times is a gradual shift from input-intensive to environmentally sound sustainable agriculture. Modelling of traditional farming systems to modern needs with increased organic linkages might be a good option for sustainability of the agricultural production system and maintenance of agroecological stability (Bhargava et al., 2008). This would also require a shift in focus towards increasing production by using agriculturally marginal lands for crops that are less exploited but that have immense potential for diverse uses (Partap et al., 1998).
The emphasis on a handful of major crops has narrowed the number of species on which global food security depends. The consequences of crop failures from unforeseen stresses, pests and diseases can be catastrophic (Prescott-Allen and Prescott-Allen, 1990). The past three decades have seen a wide range of research interests on underutilized crops and a number of significant programmes have been undertaken in both developing and developed countries to promote underutilized species for agricultural systems, as alternative crops or as sources of new products.
1.1 Underutilized Crops
Underutilized or neglected crop species are often indigenous ancient crop species that are still used at some level within the local, national or even international communities, but have the potential to contribute further to the mix of food sources (Mayes et al., 2011). These species appear to have considerable potential for use yet their potential is barely exploited, if not totally neglected, in agricultural production. Many underutilized crops were once more widely grown but are today falling into disuse for a variety of agronomic, genetic, economic and cultural reasons (Hammer et al., 2001). Farmers and consumers are using these crops less because they are not competitive with other crop species in the same agricultural environment. Orphan, abandoned, new, underutilized, neglected, lost, under-used, local, minor, traditional, forgotten, alternative, niche, promising, underdeveloped: these and other terms are often used as synonyms for underutilized species (Padulosi and Hoeschle-Zeledon, 2004). Underutilized crops are often known as ‘new crops’, not because they are ‘new’ but because they have been taken up by agricultural researchers and commercial companies for a new market. The main features of the underutilized crops are that they are:
• important in local consumption and production systems;
• highly adapted to agroecological niches and marginal areas;
• represented by ecotypes or landraces;
• cultivated and utilized drawing on indigenous knowledge;
• characterized by fragile or non-existent seed supply systems;
• hardly represented in ex situ gene banks and
• ignored by policy makers and excluded from research and development agendas (Padulosi and Hoeschle-Zeledon, 2004).
Moreover, the limited information available on many important and frequently basic aspects of neglected and underutilized crops hinders their development and sustainable conservation (Hammer et al., 2001).
Many wild and underutilized plants have potential for more widespread use and could contribute to food security, agricultural diversification and income generation (Vietmeyer, 1986; Anthony et al., 1995). Neglected and underutilized crops represent an important source of revenue for local economies and are part of the rich cultural and traditional heritage of communities around the world (IAEA, 2004). In addition to this, these crops are important sources of resistance genes for biotic and abiotic stress breeding that can also be used for the genetic improvement of crops. Compared with the major crops, they require relatively low inputs and, therefore, contribute to sustainable agricultural production. Underutilized crops have great potential to alleviate hunger directly, through increasing food production in challenging environments where major crops are severely limited, through nutritional enhancement to diets focused on staples and through providing the poor with purchasing power, helping them buy the food that is available (Mayes et al., 2011).
1.2 Chenopodium as an Underutilized Plant
Among a number of underutilized species, members of the genus Chenopodium (family Amaranthaceae) are most promising since they have the ability to thrive and flourish under stressful conditions (Bhargava et al., 2003, 2006a; Jacobsen et al., 2003a) as well as on soils with minimum agricultural inputs. Many complex adaptive modifications related to breeding system, seed dispersal and their germination account for the success of the members of this genus in colonizing disturbed habitats (Williams and Harper, 1965; Dostalek, 1987). With a shift in focus towards production on agriculturally marginal lands, Chenopodium has a significant role to play both as a nutritious food crop and as a cash crop. The genus Chenopodium, commonly known as ‘goosefoot’, comprises about 250 species (Giusti, 1970) that include herbaceous, suffrutescent and arborescent perennials, although most species are colonizing annuals (Wilson, 1990). Some well-known species include C. quinoa, C. pallidicaule, C. berlandieri ssp. nuttalliae, C. ambrosioides, C. murale and C. amaranticolor. Chenopodium spp. have been cultivated for centuries as a leafy vegetable and subsidiary grain crop in different parts of the world (Risi and Galwey, 1984). Although only three species (C. quinoa, C. pallidicaule and C. berlandieri subsp. nuttalliae) are reported to be cultivated (Heiser and Nelson, 1974; Wilson, 1980; Bhargava et al., 2006a, 2007), the leaves and tender stems of numerous other species are consumed as food and fodder (Tanaka, 1976; Kunkel, 1984; Partap, 1990; Moerman, 1998; Partap et al., 1998). The foliage of Chenopodium is an inexpensive and rich source of protein, carotenoids and vitamin C (Koziol, 1992; Prakash et al., 1993; Bhargava et al., 2006a). The protein has a balanced amino acid spectrum with high lysine (5.1–6.4%) and methionine (0.4–1.0%) contents (Prakash and Pal, 1998; Bhargava et al., 2006a).
1.3 Quinoa
Of all the new-world crops, Chenopodium quinoa Willd., commonly known as ‘quinoa’, is one of the most underutilized, given its superb seed protein composition and yield potential. It is principally a grain crop, harvested and consumed in a manner similar to that for cereal grains, although its leaves are also used as a potherb (Maughan et al., 2007). Quinoa is not a true cereal grain, but rather is a pseudocereal, which is dicotyledonous. In contrast, cereals are monocotyledonous (Valencia-Chamorro, 2003). Quinoa has risen from a neglected subsistence crop of indigenous farmers to become a major export of the Andean nations of Bolivia and Peru within the past 20 years (Jellen et al., 2011). The emergence of quinoa to prominence in organic food markets of the developed world has led to scientists giving increasing attention to the crop’s unique nutritional benefits, and potentially novel abiotic stress-tolerance mechanisms.
Quinoa is a native of the Andean region and has been cultivated in the region for around 7000 years (Garcia, 2003). Quinoa was known by a number of names in local languages. The people of the Chibcha (Bogota) culture called quinoa ‘suba’ or ‘supha’, while the Tiahuancotas (Bolivia) called it ‘jupha’ and the inhabitants of the Atacama desert knew it by the name ‘dahue’ (Pulgar-Vidal, 1954). León (1964) is of the view that the names ‘quinoa’ and ‘quinua’ were used in Bolivia, Peru, Ecuador, Argentina and Chile. The crop has been an important food grain source in the Andean region since 3000 BC (Tapia, 1982) and occupied a place of prominence in the Inca Empire only next only to maize (Cusack, 1984). However, after the conquest of the region by the Spaniards in 1532, other crops, such as potato and barley, relegated quinoa to the background (Bhargava et al., 2006a). However, the sporadic failure of green revolution in the Andes and enormous destruction of other crops by droughts, once again brought native crops like quinoa to the forefront as it showed much less fall in the yields in severe conditions (Cusack, 1984). In the mid-1970s, the exceptional nutritional characteristics of quinoa were discovered and its popularity began to increase (Maughan et al., 2007). Andean countries established small but effective breeding programmes and several new varieties were released. Efforts were made to collect diverse landraces to prevent genetic erosion, resulting in national quinoa germplasm banks in many Andean countries, with the largest banks being in Bolivia and Peru (Maughan et al., 2007).
Quinoa is grown in a wide range of environments in the South American region (especially in and around the Andes), at latitudes from 20°N in Colombia to 40°S in Chile, and from sea level to an altitude of 3800 m (Risi and Galwey, 1989). Recently it has been introduced in Europe, North America, Asia and Africa. Many European countries are members in the project entitled ‘Quinoa – A multipurpose crop for EC’s agricultural diversification’, which was approved in 1993 (Bhargava et al., 2006a). The American and European tests of quinoa have yielded good results and demonstrate the potential of quinoa as a grain and fodder crop (Mujica et al., 2001; Casini, 2002; Jacobsen, 2003; Bhargava et al., 2006a).
1.3.1 Nutritional importance of quinoa
The nutritional excellence of quinoa has been known since ancient times in the Inca Empire. The importance that quinoa could play in nutrition has been emphasized not only in developing countries but also in the developed world. Quinoa seeds have a higher nutritive value than most cereal grains and contain high-quality protein and large amounts of carbohydrates, fat, vitamins and minerals. Perisperm, embryo and endosperm are the three areas where reserve food is stored in quinoa seed (Prego et al., 1998).
The mean protein content reported for quinoa grain is 12–23% (González et al., 1989; Koziol, 1992; Ruales and Nair, 1994a, 1994b; Ando et al., 2002; Karyotis et al., 2003; Abugoch, 2009), which is higher than that of barley, rice or maize, and is comparable to that of wheat (USDA, 2005; Abugoch, 2009). Moreover, the essential amino acid balance is excellent because of a wide range of amino acids, with higher lysine (5.1–6.4%) and methionine (0.4–1%) contents (Prakash and Pal, 1998; Bhargava et al., 2003, 2006a; Abugoch, 2009). Quinoa protein can supply around 180% of the histidine, 274% of the isoleucine, 338% of the lysine, 212% of the methionine + cysteine, 320% of the phenylalanine + tyrosine, 331% of the threonine, 228% of the tryptophan and 323% of the valine recommended by FAO/WHO/UNU in protein sources for adult nutrition (Vega-Gálvez et al., 2010). Starch is the most important carbohydrate in quinoa grains, making up approximately 58.1–64.2% of the dry matter (Repo-Carrasco et al., 2003). Quinoa starch consists of two polysaccharides: amylose and amylopectin. The amylase content of quinoa starch varies between 3% and 20%, while the amylose fraction of quinoa starch is quite low (Abugoch, 2009). The starch of quinoa is highly branched, with a minimum degree of polymerization of 4600 glucan units, a maximum of 161,000 and a weighted average of 70,000 (Praznik et al., 1999). Granules of quinoa starch have a polygonal form, with a diameter of 2 μm, being smaller than starch of the common grains (Vega-Gálvez et al., 2010). The total dietary fibre of quinoa is near that of cereals (7–9.7% by difference, db), and the soluble fibre content is reported between 1.3% and 6.1% (db) (Ranhotra et al., 1993; USDA, 2005).
The ash content of quinoa (3.4%) is higher than that of rice (0.5%), wheat (1.8%) and other traditional cereals (Cardozo and Tapia, 1979). Quinoa grains contain large amounts of minerals like Ca, Fe, Zn, Cu and Mn (Repo-Carrasco et al., 2003). Calcium (874 mg/kg) and iron (81 mg/kg) in the seeds are significantly higher than most commonly used cereals (Ruales and Nair, 1992). Minerals like P, K and Mg are located in the embryo, while Ca and P in the pericarp are associated with pectic compounds of the cell wall (Konishi et al., 2004). The abundant mineral content makes the grains valuable for children and adults who can benefit from calcium for bones and from iron for blood functions (Konishi et al., 2004).
The oil content in quinoa ranges from 1.8 to 9.5%, with an average of 5.0–7.2% (DeBruin, 1964; Koziol, 1990) that is higher than that of maize (3–4%). Quinoa oil is rich in essential fatty acids such as linoleate and linolenate (Koziol, 1990) and has a high concentration of natural antioxidants like α-tocopherol and γ-tocopherol (Repo-Carrasco et al., 2003). The antioxidant activity of quinoa could be of particular interest to medical researchers and needs more attention (Bhargava et al., 2006a).
Few reports are available on the vitamin content of quinoa grain. Ruales and Nair (1992) reported appreciable amounts of thiamin (0.4 mg/100 g), folic acid (78.1 mg/100 g) and vitamin C (16.4 mg/100 g). Koziol (1992) gave riboflavin and carotene content as 0.39 mg/100 g and 0.39 mg/100 g respectively, and concluded that quinoa contains substantially more riboflavin (B2), α-tocopherol (vitamin E) and carotene than wheat, rice and barley. In a 100 g edible portion, quinoa supplies 0.20 mg vitamin B6, 0.61 mg pantothenic acid, 23.5 μg folic acid and 7.1 μg biotin (Koziol, 1992). Recent reports have also confirmed that quinoa is rich in vitamins A, B2 and E (Repo-Carrasco et al., 2003).
However, several antinutritional substances such as saponins, phytic acid, tannins and protease inhibitors have been found in quinoa seed, which can have a negative effect on the performance and survival of monogastric animals when it is used as the primary dietary energy source (Vega-Gálvez et al., 2010).
The leaves of quinoa contain ample amount of ash (3.3%), fibre (1.9%), vitamin E (2.9 mg α-TE/100 g) and Na (289 mg/100 g) (Koziol, 1992). Prakash et al. (1993) reported that leaves have about 82–190 mg/kg of carotenoids, 1.2–2.3 g/kg of vitamin C and 27–30 g/kg of proteins. A recent study on the leaf quality parameters in quinoa has shown that the leaves contain ample amount of carotenoids (230.23–669.57 mg/kg), which was higher than that reported for spinach, amaranth and C. album (Gupta and Wagle, 1988; Prakash and Pal, 1991; Shukla et al., 2003; Bhargava et al., 2006b, 2007).
1.3.2 Stress tolerance
Quinoa exhibits high levels of resistance to several of the predominant adverse factors such as soil salinity, drought (Jensen et al., 2000; González et al., 2009, 2011; Jacobsen et al., 2009; Fuentes and Bhargava, 2011), frost (Jacobsen et al., 2005, 2007), diseases and pests (Jacobsen et al., 2003a; Bhargava et al., 2003). Due to its durability under adverse climate conditions, quinoa may be one of the options for food production under various adverse abiotic constraints (FAO, 1998).
Quinoa is a halophytic species that is regarded as having an unusually high tolerance to salinity. Some varieties of the crop show remarkable resistance to salt during germination. Many varieties of this crop can grow in salt concentrations as high as those found in seawater (40 mS/cm) (Jacobsen et al., 2001, 2003a; Wilson et al., 2002; Jacobsen, 2007; Delatorre-Herrera and Pinto, 2009; Adolf et al., 2012). These characteristics make it an attractive crop for regions where salinity has been recognized as a major agricultural problem (Prado et al., 2000). Quinoa has several mechanisms that aid in successful acclimatization of the plant to saline environments. In the cotyledonous stage, high adaptability to soil salinity is probably due to improved metabolic control based on ion absorption, osmolyte accumulation and osmotic adjustment (Ruffino et al., 2010). Quinoa also accumulates salt ions in its tissues and thereby adjusts leaf water potential, enabling the plant to maintain cell turgor and to limit transpiration under saline conditions (Jacobsen et al., 2001; Hariadi et al., 2011). In addition, quinoa is able to maintain K+/Na+ and Ca²+/Na+ selectivity under saline conditions (Rosa et al., 2009).
The drought resistance of quinoa is attributed to morphological characters such as a deep, extensively ramified root system, reduction of leaf area through leaf dropping, small and thick walled cells adapted to large losses of water, and the presence of vesicles containing calcium oxalate that are hygroscopic in nature and reduce transpiration (Canahua, 1977; Jensen et al., 2000; Jacobsen et al., 2003a). Physiological characteristics indicating drought resistance include low osmotic potential, low turgid weight/dry weight ratio, low elasticity and an ability to maintain positive turgor even at low leaf water potentials (Andersen et al., 1996). It has been observed that the stomatal conductance of quinoa remains relatively stable with low but ongoing gas exchange under very dry conditions and low leaf water potentials (Vacher, 1998). Quinoa maintains high leaf water use efficiency to compensate for the decrease in stomatal conductance and thus optimizes carbon gain with a minimization of water losses. Jensen et al. (2000) studied the effects of soil drying on leaf water relations and gas exchange in quinoa. The study showed that high net photosynthesis and specific leaf area (SLA) values during early vegetative growth resulted in early vigour of the plant, supporting early water uptake and tolerance to a following drought. The leaf water relations were characterized by low osmotic potentials and low turgid weight/dry weight ratios during later growth stages sustaining a potential gradient for water uptake and turgor maintenance under high evaporation demands. Garcia et al. (2003) calculated the seasonal yield response factor (Ky) for quinoa and observed that it was lower than that of groundnut and cotton. This low Ky value for quinoa indicated that a minor drought stress does not result in a large yield decrease.
The frost resistance of quinoa has been recognized for many years (Rea et al., 1979). The species exhibits 100% germination even at 2°C and no serious effect on the plant at temperatures close to −3°C (Bois et al., 2006). The main mechanism for the frost resistance of quinoa seems to be that it tolerates ice formation in the cell walls and the subsequent dehydration of the cells, without suffering irreversible damage (Jacobsen et al., 2003a). The presence of soluble sugars, such as fructans, sucrose and dehydrins, may be good indicators of frost tolerance in quinoa (Jacobsen et al., 2003a, 2005). Results have shown that quinoa seeds germinate rapidly even at low temperatures, with the base temperature for germination lower than 0°C for 9 cultivars out of 10 (Bois et al., 2006).
Hail and snow are sporadic and localized in the Andean region and sometimes causes irreversible damage, especially when the crop is near to maturity (Jacobsen et al., 2003a). Cultivars of quinoa exist with good tolerance to hail, mainly due to a minor leaf angle and greater thickness and resistance of leaves and stem. Flooding occasionally occurs in rainy years on flat areas and produces root rot, greatly reducing yield (Jacobsen et al., 2003a). Wind affects crop productivity by causing plants to fall, especially in the arid region of the altiplano and in some inter-Andean valleys. Wind is also responsible for erosion and drying of soil and plants. When quinoa is cultivated in deserts and hot areas, high temperatures can cause flowers to abort and the death of pollen (Jacobsen et al., 2003a). Fortunately, the genetic variability of quinoa makes it possible to select cultivars with greater tolerance to each of these environmental factors.
1.3.3 Economic uses
Quinoa has diverse uses. It is considered as one of the best leaf protein concentrate sources and so has the potential as a protein substitute for food and fodder and in the pharmaceutical industry. The whole plant can also be used as green fodder for cattle, sheep, pigs, horses and poultry. Results have indicated that up to 150 g/kg unprocessed or dehulled quinoa seed could be included in broiler feed (Jacobsen et al., 1997). This incorporation of quinoa in poultry feeds can greatly benefit the poultry industry. The seeds can be eaten as a rice replacement, as a hot breakfast cereal or can be boiled in water to make infant cereal food (Bhargava et al., 2006a). Quinoa seeds can be ground and used as flour, or sprouted, and can even be popped like popcorn. In Peru and Bolivia, quinoa flakes, tortillas, pancakes and puffed grains are produced commercially (Popenoe et al., 1989). Quinoa flour in combination with wheat flour or corn meal is used in making biscuits, bread and processed food (Bhargava et al., 2006a). There are numerous recipes for about 100 preparations, including tamales, huancaína sauce, leaf salad, pickled quinoa ears, soups and casseroles, stews, torrejas, pastries, sweets and desserts, and soft and fermented hot and cold beverages, as well as breads, biscuits and pancakes, which contain 15–20% quinoa flour. The flour has good gelation property, water absorption capacity, emulsion capacity and stability (Oshodi et al., 1999). The high water absorptivity may be used in the formulation of some foods such as sausages, dough, processed cheese, soups and baked products (Oshodi et al., 1999). Quantitative analysis of the sugar content and chemical composition of seed flour of quinoa has shown that it has a high proportion of D-xylose (120 mg/100 g), and maltose (101 mg/100 g), and a low content of glucose (19 mg/100 g) and fructose (19.6 mg/100 g) (Ogungbenle, 2003). Thus, quinoa could be effectively utilized in the beverage industry for the preparation of malted drink formulations. It can be fermented to make beer, or used to feed livestock (Galwey, 1989). Solid-state fermentation of quinoa with Rhizopus oligosporus Saito provides a good-quality tempeh (Valencia-Chamorro, 2003). Quinoa milk, a high quality and nutritive product, may have the potential for consumption as milk or as an ingredient of milky products (Jacobsen et al., 2003b). This tasty and healthy product is of particular importance for people who are unable to digest casein or animal lactose.
Quinoa starch can be used for specialized industrial applications because of its small granules and high viscosity (Galwey et al., 1990). Starches having small-sized granules could serve as dusting starches in cosmetics and rubber tyre mould release agents (Bhargava et al., 2006a). Quinoa starch also has potential for utilization as biodegradable fillers in low-density polyethylene (LDPE) films (Ahamed et al., 1996a). However, this aspect needs more investigation for effective utilization in the food, pharmaceutical and textile industries. Because of its mechanical properties, quinoa starch can be utilized in the manufacture of carrier bags, where tensile strength is important. Studies on freeze–thaw stability of quinoa starch have shown that its paste is resistant to retrogradation, suggesting applications in frozen and emulsion type food products (Ahamed et al., 1996b; Bhargava et al., 2006a). Another potential use of the plant could be in cloth dyeing and food preparation because of the presence of betalains, a natural colorant (Jacobsen et al., 2003b).
Quinoa has been evaluated as a food with excellent nutritional characteristics by the National Research Council and the National Aeronautics and Space Administration (NASA) (Schlick and Bubenheim, 1996). The plant is being considered as a potential crop for NASA’s Controlled Ecological Life Support System (CELSS), which aims to use plants to remove carbon dioxide from the atmosphere and generate food, oxygen and water for the crew of long-term space missions (Schlick and Bubenheim, 1996).
1.3.4 Medicinal importance
The use of quinoa for medicinal purposes has also been reported (Mujica, 1994). The plant is reportedly used in inflammation, as an analgesic and as a disinfectant of the urinary tract. It is also used in fractures and internal haemorrhaging and as an insect repellent (Mujica, 1994). The presence of glycine betaine, trigonelline and their derivatives has been reported in the plant (Jancurova et al., 2009). In humans, glycine betaine can be readily absorbed through dietary intake or endogenously synthesized in the liver through choline catabolism. The concentration of glycine betaine in human blood plasma is highly regulated. Its concentrations are lower in patients with renal disease, and its urinary excretion is elevated in patients with diabetes mellitus (Dini et al., 2006). Glycine betaine intake can lower plasma homocysteine levels in patients suffering from homocystinuria, and in chronic renal failure patients with hyperhomocysteinemia, as well as in healthy subjects (Tang et al., 2002; Jancurova et al., 2009). Recently, the cell wall polysaccharides of quinoa seeds (arabinan and arabinan-rich pectic polysaccharides) showed gastroprotective activity on ethanol-induced acute gastric lesions in rats (Cordeiro et al., 2012). These reports can open new avenues for use of quinoa as a medicinal crop.
Dietary flavonoids are thought to have health benefits, possibly due to antioxidant and anti-inflammatory properties (Hirose et al., 2010). Quinoa seeds are the most effective foodstuff as a source of flavonoids among cereals and pseudo-cereals. Recent studies have identified large amounts of flavonoid conjugates in quinoa seeds, such as kaempferol and quercetin oligomeric glycosides (Zhu et al., 2001; Dini et al., 2004; Hirose et al., 2010). Flavonoids, one of the typical polyphenols in vegetables, fruits and tea, can prevent degenerative diseases such as coronary heart disease (Arts and Hollman, 2005), atherosclerosis (Kurosawa et al., 2005), cancers (Rice-Evans and Packer, 1998), diabetes and Alzheimer’s disease (Youdim et al., 2004), through antioxidative action and/or the modulation of several protein functions (Hirose et al., 2010). Quinoa also contains appreciable amount of vitamin E (Repo-Carrasco et al., 2003). This is important since this vitamin acts as an antioxidant at the cell membrane level, protecting the fatty acids of the cell membranes against damage caused by free radicals.
The highly nutritious quinoa flour could be used to supplement protein-deficient wheat flour, commonly used for human consumption, in regions where protein deficiency occurs. Quinoa can be recommended for maturity-onset diabetes patients because of its low fructose and glucose. Quinoa flour can be used as a substitute for wheat flour in the production of bread for celiac consumers, with substitutions in small amounts having shown a positive effect on the quality of the breads (Park et al., 2005). One study showed increase in the level of insulin-like growth factor-1 (IGF-1) in the plasma of children who consumed a supplementary portion of an infant food prepared by drum-drying a pre-cooked slurry of quinoa flour (Ruales et al., 2002).
1.4 Concluding Remarks
Quinoa’s ability to produce grains high in protein under ecologically extreme conditions makes it important for the diversification of future agricultural systems, not just in mountainous regions, but also in the plains (Bhargava et al., 2006a). The high nutritional quality and multiple uses in food products makes quinoa seed ideal for utilization by the food industry. Other potential uses of quinoa include: a flow improver in starch flour products, fillers in the plastic industry, anti-offset and dusting powders, and a complementary protein for improving the amino acid balance of human and animal foods (Bhargava et al., 2006a). Efforts should be directed to evolving edible varieties with high-quality components, better yield, large seed size and low saponin content. Making quinoa more popular would require dissemination of information about the crop among farmers as well as consumers, proper marketing and efficient post-harvest technologies. Quinoa has the potential to shed its underutilized status and become an important industrial and food crop of the 21st century.
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