بادام، ارژن (Prunus dulcis, مترادف (زیستشناسی) Prunus amygdalus) نوعی میوه است، که درخت آن بومی نواحی خاورمیانه و جنوب آسیا میباشد. در اصل بادام جزو مغزهای حقیقی به حساب نمیآید، بلکه از انواع شفت هاست که دارای یک پوسته بیرونی و یک پوشش درونی سخت است که دانه (مغز) در درون آن قرار میگیرد. ارتفاع درخت بادام ۴ تا ۱۰ متر است و قطر آن نیز میتواند به بیش از ۳۰ سانتیمتر برسد. بزرگترین کشورهای تولیدکننده بادام در دنیا ایالات متحده آمریکا و اسپانیا هستند. ایران با تولید ۶٪ در رتبه پنجم تولیدکنندگان این میوه قرار دارد. ۴۹٪ دانه بادام را روغن تشکیل میدهد که ۶۲٪ آن اولئیک اسید غیر اشباع، ۲۴٪ لینولئیک اسید غیراشباع، و ۶٪ آن پالمیتیک اسید اشباع است. مقدار انرژی موجود در هر ۱۰۰ گرم مغز بادام، ۵۷۶ کیلوکالری است. کاشتن درخت بادام در باغچه خانه راحت است. میتوانید آن را در فصل زمستان بکارید تا بهار جوانه بزند. مراقب باشد که گیاهتان باید نور خورشید ببیند و در فصل تابستان هفتهای یک بار آبیاری شود بهترین نوع این محصول در شهرستان تسوج از آذربایجان شرقی یافت میشود.
منطقه تولید عمده بادام، کالیفرنیا در آمریکا است، بین فوریه و مارس، شکوفههایی که شباهت زیادی به شکوفهٔ گیلاس دارند، شکوفا میشوند. نوع آب و هوا در این زمان، میزان تولید بادام در آن سال را به شدت تحت تأثیر قرار خواهد داد. از وضعیت گل اطلاعات بسیار مهمی در مورد برداشت محصول در آن سال به دست میآید؛ بنابراین، هر مرحله از وضعیت گل نام بخصوصی دارد:
بادام کوهی، نام درختچه سبز رنگی است با برگهای باریک و کوچک که در اقلیم نیمه خشک ایران میروید. بادام کوهی از خانواده گل سرخیان میباشد. ارتفاع متوسط گیاه بین ۲٫۵ تا ۳ متر و قطر تاج پوشش آن نیز به ۲ تا ۲٫۵ متر بالغ میگردد. گلهای سفیدرنگ بادام معمولاً قبل از ظهور برگها در اوایل فروردینماه ظاهر میشوند. دانه این گیاه که پس از فراوری (شیرین کردن) مصرف خوراکی دارد معمولاً از اوایل خرداد تا اواخر این ماه برداشت میشود.
زیستگاه بادام کوهی[ویرایش]
بادام کوهی در خاکهای عمیق تا نیمهعمیق، سنگریزهدار و بر روی تشکیلات آهکی – سیلیسی در شیبهای ملایم کوهستانها میروید. بومی ایران و منطقهٔ خاورمیانه، گستردگی در مناطق جنوبی، مرکزی و شمال شرق ایران، در کوههای آهکی- سنگلاخی است. دامنههای ارتفاعی رویشگاه بادام کوهی بین ۸۰۰ تا ۲۷۰۰ متر از سطح دریا، در خطوط هم باران ۱۵۰ تا ۲۵۰ میلیمتر قرار گرفتهاند.
این گیاه در مناطق کوهستانی در استانهای فارس، کرمان خوزستان، سیستان و بلوچستان، یزد، اراک، کردستان، بختیاری، تهران، میانه و لرستان و در انواع مختلف خاک رشد میکند.
بادام تلخ نیز مانند دانههای هلو، زردآلو، آلو، سیب، به و گیلاس از آمیگدالین تشکیل یافته است که میتواند در بدن تبدیل به سیانید شود. در تمام دنیا دو نوع بادام وجود دارد: بادام شیرین و بادام تلخ. بادام تلخ باید به منظور از بین رفتن مواد شیمیایی سمی موجود در آن حرارت داده شود یا پاستوریزه شود. بادام سرشار از پروتئین، ویتامین E، کلسیم، منیزیم، پتاسیم و آهن است که برای بدن مفید میباشد؛ اما مصرف بادام تلخ به هیچ عنوان توصیه نمیشود.
مغز بادام تلخ به مقدار کم حاوی سیانور دو پتاس و اسید سیاندریک است که اگر فردی به مقدار زیاد آن را مصرف کند، مسموم میشود. مصرف پنج تا ده عدد مغز بادام تلخ در کودکان میتواند مسمومیت شدید به همراه داشته باشد، در بزرگسالان این تعداد به ۵۰ عدد میرسد.
پیوند به بیرون[ویرایش]
Almond is also the name of the edible and widely cultivated seed of this tree. Within the genus Prunus, it is classified with the peach in the subgenus Amygdalus, distinguished from the other subgenera by corrugations on the shell (endocarp) surrounding the seed.
The fruit of the almond is a drupe, consisting of an outer hull and a hard shell with the seed, which is not a true nut, inside. Shelling almonds refers to removing the shell to reveal the seed. Almonds are sold shelled or unshelled. Blanched almonds are shelled almonds that have been treated with hot water to soften the seedcoat, which is then removed to reveal the white embryo.
The almond is a deciduous tree, growing 4–10 m (13–33 ft) in height, with a trunk of up to 30 cm (12 in) in diameter. The young twigs are green at first, becoming purplish where exposed to sunlight, then grey in their second year. The leaves are 3–5 inches long, with a serrated margin and a 2.5 cm (1 in) petiole. The flowers are white to pale pink, 3–5 cm (1–2 in) diameter with five petals, produced singly or in pairs and appearing before the leaves in early spring. Almond grows best in Mediterranean climates with warm, dry summers and mild, wet winters. The optimal temperature for their growth is between 15 and 30 °C (59 and 86 °F) and the tree buds have a chilling requirement of 300 to 600 hours below 7.2 °C (45.0 °F) to break dormancy.
The almond fruit measures 3.5–6 cm (1–2 in) long. In botanical terms, it is not a nut but a drupe. The outer covering or exocarp, fleshy in other members of Prunus such as the plum and cherry, is instead a thick, leathery, grey-green coat (with a downy exterior), called the hull. Inside the hull is a reticulated, hard, woody shell (like the outside of a peach pit) called the endocarp. Inside the shell is the edible seed, commonly called a nut. Generally, one seed is present, but occasionally two occur.
Origin and history
The almond is native to the Mediterranean climate region of the Middle East, eastward as far as the Yamuna River in India. It was spread by humans in ancient times along the shores of the Mediterranean into northern Africa and southern Europe, and more recently transported to other parts of the world, notably California, United States.
The wild form of domesticated almond grows in parts of the Levant. The fruit of the wild forms contains the glycoside amygdalin, "which becomes transformed into deadly prussic acid (hydrogen cyanide) after crushing, chewing, or any other injury to the seed."
Selection of the sweet type from the many bitter types in the wild marked the beginning of almond domestication. It is unclear as to which wild ancestor of the almond created the domesticated species. Ladizinsky suggests the taxon Amygdalus fenzliana (Fritsch) Lipsky is the most likely wild ancestor of the almond in part because it is native of Armenia and western Azerbaijan where it was apparently domesticated.
While wild almond species are toxic, domesticated almonds are not; Jared Diamond argues that a common genetic mutation causes an absence of amygdalin, and this mutant was grown by early farmers, "at first unintentionally in the garbage heaps, and later intentionally in their orchards".
Zohary and Hopf believe that almonds were one of the earliest domesticated fruit trees due to "the ability of the grower to raise attractive almonds from seed. Thus, in spite of the fact that this plant does not lend itself to propagation from suckers or from cuttings, it could have been domesticated even before the introduction of grafting".
Domesticated almonds appear in the Early Bronze Age (3000–2000 BC) such as the archaeological sites of Numeria (Jordan), or possibly a little earlier. Another well-known archaeological example of the almond is the fruit found in Tutankhamun's tomb in Egypt (c. 1325 BC), probably imported from the Levant.
Of the European countries that the Royal Botanic Garden Edinburgh reported as cultivating almonds, Germany is the northernmost, though the domesticated form can be found as far north as Iceland.
Etymology and names
The word "almond" comes from Old French almande or alemande, Late Latin *amandula, derived through a form amygdala from the Greek ἀμυγδάλη (amygdálē) (cf. amygdala), an almond. The al- in English, for the a- used in other languages may be due a confusion with the Arabic article al, the word having first dropped the a- as in the Italian form mandorla; the British pronunciation ah-mond and the modern Catalan ametlla and modern French amande show a form of the word closer to the original. Other related names of almond include mandel or knackmandel (German), mandorlo (Italian for the tree), mandorla (Italian for the fruit), amêndoa (Portuguese), and almendra (Spanish).
The adjective "amygdaloid" (literally "like an almond") is used to describe objects which are roughly almond-shaped, particularly a shape which is part way between a triangle and an ellipse. See, for example, the brain structure amygdala, which uses a direct borrowing of the Greek term amygdalē.
The pollination of California's almonds is the largest annual managed pollination event in the world, with close to one million hives (nearly half of all beehives in the US) being trucked in February to the almond groves. Much of the pollination is managed by pollination brokers, who contract with migratory beekeepers from at least 49 states for the event. This business has been heavily affected by colony collapse disorder, causing nationwide shortages of honey bees and increasing the price of insect pollination. To partially protect almond growers from the rising cost of insect pollination, researchers at the Agricultural Research Service (ARS) have developed a new line of self-pollinating almond trees. Self-pollinating almond trees, such as the 'Tuono', have been around for a while, but their harvest is not as desirable as the insect-pollinated California 'Nonpareil' almond tree. The 'Nonpareil' tree produces large, smooth almonds and offers 60–65% edible kernel per nut. The Tuono has thicker, hairier shells and offers only 32% of edible kernel per nut, but having a thick shell has advantages. The Tuono's shell protects the nut from threatening pests such as the navel orangeworm. ARS researchers have managed to crossbreed the pest-resistant Tuono tree with the 'Nonpareil, resulting in hybridized cultivars of almond trees that are self-pollinated and maintain a high nut quality. The new, self-pollinating hybrids possess quality skin color, flavor, and oil content, and reduce almond growers' dependency on insect pollination.
Almond trees can be attacked by an array of damaging organisms, including insects, fungal pathogens, plant viruses, and bacteria.
In 2014, world production of almonds was 2.7 million tonnes, with United States providing 57% of the total. As the second and third leading producers, Spain and Australia combined contributed 13% of the world total (table).
In the United States, production is concentrated in California where 1,000,000 acres (400,000 ha) and six different almond varieties were under cultivation in 2017, with a yield of 2.25 billion lbs (1 billion kg) of shelled almonds. The value of total US exports of shelled almonds in 2016 was $3.2 billion.
Australia is the largest almond production region in the Southern Hemisphere. Most of the almond orchards are located along the Murray River corridor in New South Wales, Victoria, and South Australia.
Sweet and bitter almonds
The seeds of Prunus dulcis var. dulcis are predominantly sweet but some individual trees produce seeds that are somewhat more bitter. The genetic basis for bitterness involves a single gene, the bitter flavor furthermore being recessive, both aspects making this trait easier to domesticate. The fruits from Prunus dulcis var. amara are always bitter, as are the kernels from other species of genus Prunus, such as peach and cherry (although to a lesser extent).
The bitter almond is slightly broader and shorter than the sweet almond and contains about 50% of the fixed oil that occurs in sweet almonds. It also contains the enzyme emulsin which, in the presence of water, acts on soluble glucosides, amygdalin, and prunasin, yielding glucose, cyanide and the essential oil of bitter almonds, which is nearly pure benzaldehyde, the chemical causing the bitter flavor. Bitter almonds may yield 4–9 mg of hydrogen cyanide per almond and contain 42 times higher amounts of cyanide than the trace levels found in sweet almonds. The origin of cyanide content in bitter almonds is via the enzymatic hydrolysis of amygdalin.
Extract of bitter almond was once used medicinally but even in small doses, effects are severe or lethal, especially in children; the cyanide must be removed before consumption. The acute oral lethal dose of cyanide for adult humans is reported to be 0.5–3.5 mg/kg of body weight (approximately 50 bitter almonds), whereas for children, consuming 5–10 bitter almonds may be fatal.
All commercially grown almonds sold as food in the United States are sweet cultivars. The US Food and Drug Administration reported in 2010 that some fractions of imported sweet almonds were contaminated with bitter almonds. Eating such almonds could result in vertigo and other typical bitter almond (cyanide) poisoning effects.
While the almond is often eaten on its own, raw or toasted, it is also a component of various dishes. Almonds are available in many forms, such as whole, sliced (flaked, slivered), and as flour. Almonds yield almond oil and can also be made into almond butter or almond milk. These products can be used in both sweet and savoury dishes.
Along with other nuts, almonds can be sprinkled over breakfasts and desserts, particularly muesli or ice cream-based dishes. Almonds are used in marzipan, nougat, many pastries (including jesuites), cookies (including French macarons, macaroons), and cakes (including financiers), noghl, and other sweets and desserts. They are also used to make almond butter, a spread similar to peanut butter, popular with peanut allergy sufferers and for its naturally sweeter taste. The young, developing fruit of the almond tree can be eaten whole (green almonds) when they are still green and fleshy on the outside and the inner shell has not yet hardened. The fruit is somewhat sour, but is a popular snack in parts of the Middle East, eaten dipped in salt to balance the sour taste. Also in the Middle East they are often eaten with dates. They are available only from mid-April to mid-June in the Northern Hemisphere; pickling or brining extends the fruit's shelf life.
The 'Marcona' almond cultivar is recognizably different from other almonds, and is marketed by name. The kernel is short, round, relatively sweet, and delicate in texture. It has been grown in Spain for a long time and its origin is unknown; the tree is very productive, and the shell of the nut is very hard. 'Marcona' almonds are traditionally served after being lightly fried in oil, and are used by Spanish confectioners to prepare a sweet called turrón.
Certain natural food stores sell "bitter almonds" or "apricot kernels" labeled as such, requiring significant caution by consumers for how to prepare and eat these products.
Almonds can be processed into a milk substitute called almond milk; the nut's soft texture, mild flavor, and light coloring (when skinned) make for an efficient analog to dairy, and a soy-free choice for lactose intolerant people and vegans. Raw, blanched, and lightly toasted almonds work well for different production techniques, some of which are similar to that of soymilk and some of which use no heat, resulting in "raw milk" (see raw foodism).
Almond flour and skins
Almonds contain polyphenols in their skins consisting of flavonols, flavan-3-ols, hydroxybenzoic acids and flavanones analogous to those of certain fruits and vegetables. These phenolic compounds and almond skin prebiotic dietary fiber have commercial interest as food additives or dietary supplements.
Historically, almond syrup was an emulsion of sweet and bitter almonds, usually made with barley syrup (orgeat syrup) or in a syrup of orange flower water and sugar, often flavored with a synthetic aroma of almonds.
Due to the cyanide found in bitter almonds, modern syrups generally are produced only from sweet almonds. Such syrup products do not contain significant levels of hydrocyanic acid, so are generally considered safe for human consumption.
The almond is a nutritionally dense food (see chart pictured right) and a 100 gram amount is a rich source (>20% of the Daily value, DV) of the B vitamins riboflavin and niacin, vitamin E, and the essential minerals calcium, iron, magnesium, manganese, phosphorus, and zinc. The same amount is also a good source (10–19% DV) of the B vitamins thiamine, vitamin B6, and folate; choline; and the essential mineral potassium. They are also rich in dietary fiber, monounsaturated fats, and polyunsaturated fats, fats which potentially may lower LDL cholesterol. Typical of nuts and seeds, almonds also contain phytosterols such as beta-sitosterol, stigmasterol, campesterol, sitostanol, and campestanol, which have been associated with cholesterol-lowering properties.
Almonds may cause allergy or intolerance. Cross-reactivity is common with peach allergens (lipid transfer proteins) and tree nut allergens. Symptoms range from local signs and symptoms (e.g., oral allergy syndrome, contact urticaria) to systemic signs and symptoms including anaphylaxis (e.g., urticaria, angioedema, gastrointestinal and respiratory symptoms).
Almonds are a rich source of oil, with 50% of kernel dry mass as fat (table). Almond oil contains 32% monounsaturated oleic acid (an omega-9 fatty acid), 13% linoleic acid (a polyunsaturated omega-6 essential fatty acid), and 5% saturated fatty acid (USDA link in table). Linolenic acid, a polyunsaturated omega-3 fat, is not present (table). Almond oil is a rich source of vitamin E providing 261% of the Daily Value per 100 ml (table).
Oleum amygdalae, the fixed oil, is prepared from either sweet or bitter almonds, and is a glyceryl oleate with a slight odour and a nutty taste. It is almost insoluble in alcohol but readily soluble in chloroform or ether. Sweet almond oil is obtained from the dried kernel of sweet almonds.
Almond oil can also be used as a wood conditioner for certain woodwind instruments such as: the oboe, the clarinet, and the saxophone.
Almonds are susceptible to aflatoxin-producing molds. Aflatoxins are potent carcinogenic chemicals produced by molds such as Aspergillus flavus and Aspergillus parasiticus. The mold contamination may occur from soil, previously infested almonds, and almond pests such as navel-orange worm. High levels of mold growth typically appear as gray to black filament like growth. It is unsafe to eat mold infected tree nuts.
Some countries have strict limits on allowable levels of aflatoxin contamination of almonds and require adequate testing before the nuts can be marketed to their citizens. The European Union, for example, introduced a requirement since 2007 that all almond shipments to EU be tested for aflatoxin. If aflatoxin does not meet the strict safety regulations, the entire consignment may be reprocessed to eliminate the aflatoxin or it must be destroyed.
Mandatory pasteurization in California
The USDA approved a proposal by the Almond Board of California to pasteurize almonds sold to the public, after tracing cases of salmonellosis to almonds. The almond pasteurization program became mandatory for California companies in 2007. Raw, untreated California almonds have not been available in the U.S. since then.
California almonds labeled "raw" must be steam-pasteurized or chemically treated with propylene oxide (PPO). This does not apply to imported almonds or almonds sold from the grower directly to the consumer in small quantities. The treatment also is not required for raw almonds sold for export outside of North America.
The Almond Board of California states: “PPO residue dissipates after treatment.” The U.S. EPA has reported: “Propylene oxide has been detected in fumigated food products; consumption of contaminated food is another possible route of exposure.” PPO is classified by the EPA as a “Group B2, probable human carcinogen."
The USDA-approved marketing order was challenged in court by organic farmers organized by the Cornucopia Institute, a Wisconsin-based farm policy research group. According to the Cornucopia Institute, this almond marketing order has imposed significant financial burdens on small-scale and organic growers and damaged domestic almond markets. A federal judge dismissed the lawsuit in the spring of 2009 on procedural grounds. In August 2010, a federal appeals court ruled that the farmers have a right to appeal the USDA regulation. In March 2013, the court vacated the suit on the basis that the objections should have been raised in 2007 when the regulation was first proposed.
The almond is highly revered in some cultures. The tree originated in the Middle East, and is mentioned numerous times in the Bible.
In the Hebrew Bible, the almond was a symbol of watchfulness and promise due to its early flowering. In the Bible the almond is mentioned ten times, beginning with Book of Genesis 43:11, where it is described as "among the best of fruits". In Numbers 17 Levi is chosen from the other tribes of Israel by Aaron's rod, which brought forth almond flowers. According to tradition, the rod of Aaron bore sweet almonds on one side and bitter on the other; if the Israelites followed the Lord, the sweet almonds would be ripe and edible, but if they were to forsake the path of the Lord, the bitter almonds would predominate. The almond blossom supplied a model for the menorah which stood in the Holy Temple, "Three cups, shaped like almond blossoms, were on one branch, with a knob and a flower; and three cups, shaped like almond blossoms, were on the other...on the candlestick itself were four cups, shaped like almond blossoms, with its knobs and flowers" (Exodus 25:33–34; 37:19–20).
Similarly, Christian symbolism often uses almond branches as a symbol of the Virgin Birth of Jesus; paintings and icons often include almond-shaped haloes encircling the Christ Child and as a symbol of Mary. The word "Luz", which appears in Genesis 30:37, sometimes translated as "hazel", may actually be derived from the Aramaic name for almond (Luz), and is translated as such in some Bible versions such as the NIV. The Arabic name for almond is لوز "lauz" or "lūz". In some parts of the Levant and North Africa it is pronounced "loz", which is very close to its Aramaic origin.
La entrada de la flor is an event celebrated on 1 February in Torrent, Spain, in which the clavarios and members of the Confrerie of the Mother of God deliver a branch of the first-blooming almond-tree to the Virgin.