Onion yellow

Yellow and red onions (Allium cepa) were reported to be poor antioxidants toward oxidation of methyl linoleate (Kahkonen and others 1999) in contrast to their high antioxidant activity toward oxidation of LDL (Vinson and others 1998). Garlic (Allium sativum L) was reported to have four times more antioxidant activity than onions when using the ORAC assay (Cao and others 1996). 

Marlett JA. 2000. Changes in content and composition of dietary fiber in yellow onions and Red Delicious apples during commercial storage. J AOAC Int 83 992-996. 

Pale yellow oily liquid with an odor like onions. This material is hazardous through inhalation and ingestion, and produces local skin/eye impacts. 

Colorless to pale-yellow liquid with an odor that is pungent, irritating, and resembles onions or garlic. It is detectable at 21.4 ppm. Typically stabilized with 35-50 ppm of methyl-hydroquinone. This material is hazardous through inhalation, skin absorption (liquid), penetration through broken skin, and ingestion, and produces local skin/eye impacts. 

Harvest garlic when the first 4-6 leaves turn yellow. Leave onions and shallots until all the leaves have fallen over naturally. Lift carefully, and leave in a warm, dry place for a couple of weeks. In dry weather, do this outdoors, lifted off the ground on racks or pallets. Otherwise, bring them under cover to finish drying. Bulbs are ready to store when the skins are papery and rustle when handled. Braid into ropes or hang in net sacks in a place where air circulates freely. Ideal storage temperature is 36-39°F (2-4°C). 

Symptoms Yellow patches on upper leaf surfaces, with corresponding patches of mold beneath in damp weather. Large areas of a leaf may be infected and the leaf may die. Onions rot in store. Most common in damp and humid growing situations. 

Clear, colorless to pale yellow-brown, watery, volatile liquid with a sweet, irritating or pungent odor resembling peach pits, onions, or garlic. Evaporates quickly when spilled. Turns dark on exposure to air. Odor threshold concentrations of 1.6 and 8.8 ppmv were reported by Stalker (1973) and Nagata and Takeuchi (1990), respectively. 

Synonyms Disulfide, allyl propyl onion oil Physical Form. Pale yellow oil Source. Onions Exposure. Inhalation... 

Flavonols Yellow onion, green tea Linear ( + ) THAP, lAA 319... 

Onion oil is obtained by steam distillation of the crushed bulbs of the common onion. Allium cepa L. It is an amber-yellow to amber liquid with a strongly pungent, lasting, characteristic onion odor. 

White and yellow strains of sweet Spanish onions have recently been irradiated by the Brookhaven group (D5). An 8,000-r. treatment was found to be completely effective in sprout suppression although there was no indication that any of the radiation treatment affected rotting, which proceeded at a normal rate. 

Escape Shorter crop growth period and/or early ripening to be able to avoid the critical infestation period, or to have enough yield before the infestation becomes too severe (potato/late blight onion/downy mildew carrot/carrot fly) One or more monofactorial and multifactorial, durable resistance traits against pest and disease affecting yield and/or quality (scab/apple, late blight/potato, lettuce/downy mildew, yellow and brown leaf rust/wheat) weed competition by an allelochemical ability... 

An HPLC separation method with diode array detector and mass spectrometric (MS) detection equipped with atmospheric pressure ionization (API) was developed to determine flavone, flavonol, and flavanone in various vegetables, including green bean, broccoli, brussels sprouts, celery, kale, leek, onion, parsley, pepper (green, yellow, and red), and tomato (118). The flavonoids were analyzed as aglycones after acid hydrolysis. The extraction and acid hydrolysis conditions are based on previous work by Hertog et al. (119). Quercetin is the overall major flavonol, followed by kaempferol. The flavones, apigenin and luteolin, were found only in limited foods,... 

Flavonoid Yellows Structures containing Phenols, names depending OH or OCH position Quercetin Black oak (Quercus velutina Lam.) Onions (Allium sp.) Red grapes (Vitis sp.) Requires mordant. Metal ions in a mordant fbrm insoluble lake with OH and OCH groups. 

Probably the most commonly referred to compound which accounts for a form of passive resistance of a chemical nature is protocatechuic acid (6.16) which is found in yellow and red skinned onions and prevents the germination of spores of the onion smudge fungus, Colletotrichum circinans. Thus, protocatechuic acid serves as a barrier to infection prior to penetration. Once penetration occurs the compound is ineffective. 

Flavonols Quercetin Yellow onions, curly kale, broccoli, blueberry,... 

Easter egg dyes are natural dyes that can be found around the home. They include blue from cabbage leaves or blueberries, orange from yellow onion skins, red from cranberries or raspberries, pale green from spinach leaves, and light yellow from orange or lemon peels. Dyes often have different colors in acidic and alkaline solutions. This enables them to be used as acid-base indicators. Many dyes are utilized as biological stains, see also Cosmetics Perkin, William Henry Pigments. 

Yellow Red onion Outer skin of root Chrome... 

Onion Oil occurs as a clear, amber yellow to amber orange liquid with a strong, pungent odor and taste characteristic of onion. It is the volatile oil obtained by steam distillation of the bulbs of Allium cepa L. (Fam. Liliaceae). It is soluble in most fixed oils, in mineral oil, and in alcohol. It is insoluble in glycerin and in propylene glycol. 

Sulfur mustard Yellow or brown Garlic, onions, or mustard NOTE Sometimes has no odor... 

TALCUM or TALC — A Transparent Material, Brilliant similar to those Pearls called Unio, or to the Onion, as it is composed of many layers, and is of flaky nature. There are four species-white, yellow, black, and red. 

SKEWERING INGREDIENTS 8 ounces large shrimp 8 ounces scallops or fish chunks 2 bell peppers, one green and one yellow or orange 1 medium onion, cut into chunks... 

Specifications. 40 ib (18.2 kg) gas fryers, frying temperature 350°F (177°C) hourly rotation breaded chicken, fish, onion rings, French fries 5-ppm dimethyl polysiloxane antifoam, 200-ppm tertiary butyi hydroguinone. FFA = free fatty acids, FOS = food oil sensor LY = Lovibond yellow LR = Lovibond red TPM = total polar material. 

Phenyl carbylamine chloride is an oily liquid which is only slightly volatile. It is pale yellow in colour and has an onion-like odour. At ordinary pressure it boils at 208° to 210° C., and at 15 mm. pressure at 95° C. The specific gravity is 1-30 at 15° C., and the vapour density is 6 03. The coefficient of thermal expansion is 0 000895. The volatility at 20° C. is 2,100 mgm. per cu. m. It is insoluble in water, but soluble in chloroform, carbon tetrachloride and other organic solvents. 

Yellow Spanish onions. Photograph by James Sikkema. Reproduced by permissiorL... 

Related to onions and garlic, but much prettier, ornamental alliums bloom in shades of blue, purple, pink, white, and yellow. Allium foliage may be rounded and hollow like onion leaves or straplike and solid when bruised, the leaves release the pungent fragrance associated with culinary alliums. The blossoms, however, may have a pleasant floral smell. Small star- or bell-shaped flowers cluster in 2"-9" globes atop leafless stems in early summer. Plants range from 6" to 5 tall. 

To help prevent populations of disease organisms from building up in the soil, avoid planting onions where onion family members have been grown during the previous 3 years. In general, white onions are more prone to problems than yellow or red ones. 

Plant stunted leaves may be yellow. Causes Nitrogen deficiency waterlogged soil aphids, piri, root. Onions need ample nitrogen, der o er-. r ar.-.s are pale and grow slowly. Waterlogged S- earr.ages roots and produces the... 

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