Onion white

Fig. 2.55. Gradient reversed-phase HPLC analysis of flavonoids in white onions (a) and celery (b). ODS column of 150 X 3.9mm i.d particle size 5pm. Mobile phase 20min gradient of 15-35 per cent acetonitrile in water adjusted to pH 2.5 with TFA. Fowrate lml/min. Upper and lower traces represent samples before and after hydrolysis, respectively. Detection wavelength 365 nm. IS = internal standard Qc = quercetin Ap = apigenin Lt = luteolin. Reprinted with permission from A. Crozier et al. [159],...

The tests for in vitro biocompatibility were performed on normal cells (Vero) and tumor cells (glioblastoma). No cytotoxicity was detected in cells (normal or tumor) cultured with red and white onion extracts at low concentrations (between 0% and 1%), the cell viability being aronnd 90%. At higher concentration, the viability decrease slowly at 80% (Fig. 41.4a). On the other hand, garlic extracts indnce toxicity both on normal and tnmor cells at very low concentrations (Fig. 41.4b). 

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. 

TPC measured in onion-fairuly vegetables included 17-181 for raw yellow onion, 82-126 for raw red onion, 115 for raw pink shallot, 42-88 for raw leek, and 46 for raw white onion. Among pod vegetables, raw green bean had TPC of 5-458. 

United States exports of spices in 1992 totaled 87.7 million up from 85.2 million in 1991 (Table 4). Dehydrated onion was the most important export spice product at 36.1 million followed by dehydrated gadic, 7.5 million capsicum peppers, 8.9 million black and white pepper, 5.8 million and prepared mustard products, 4.8 million. Canada, Japan, and Germany are the principal markets for United States spice exports. The production in the United States of temperate 2one spices is increa sing every year some of this output is exported as raw spice. 

Jacques Sorci, the executive chef for the Ritz-Carlton New York, Battery Park, buys small, sweet onions from an organic farm in Quakertown, Pennsylvania, and cooks and pickles them a la gtecque in chicken stock, white wine vinegar, bay leaves and fresh thyme, to serve as a garnish for gibsons at Rise, the hotel s bar.That s so what. 

Acrolein has been detected in effluent water streams from industrial and municipal sources. Municipal effluents from Dayton, Ohio, for example, contained between 20 and 200 pg acrolein/L in 6 of 11 analyzed samples (USEPA 1980 Beauchamp et al. 1985). Acrolein is also a component of many foods, and processing may increase the acrolein content (USEPA 1980). Acrolein has been identified in raw turkey, potatoes, onions, coffee grounds, raw cocoa beans, alcoholic beverages, hops (USEPA 1980), white bread, sugarcane molasses, souring salted pork, and cooked bluefin tuna (Thunnus thynnus) (Beauchamp et al. 1985). 

The experiment with 0.5 g/mL of erode extracts of different parts of Allium plants (bulb, green leaf, white stalk) showed the inhibition of acrosin and trypsin activities, mostiy the red onion and garlic extracts. These results demonstrated that spermicidal effect of Allium extracts is determined also by their capacity of protease inhibition. The red onion extract shows the higher antioxidant capacity and a very low cytotoxicity. 

Three or four years is the usual recommended minimum for a crop rotation, but it can certainly be longer. If you know that your soil has a serious, persistent problem, such as potato cyst nematode, onion white rot, or clubroot, you may need a much longer rotation to grow susceptible crops with any success. 

All members of the onion tribe are hardy, cool-climate crops. Green onions, a quick filler crop, are eaten as slim young plants, leaves and all. Onions, shallots, and garlic are usually harvested once they are mature when dry, they can store well for many months (seep.271). Leeks, which do not produce a bulb, are grown for their long white, cylindrical shank. They can be left in the ground to harvest in the winter months. 

Symptoms Young plants wilt and die leaves and stems of older plants become soft and rotten. Larvae bore into onion bulbs, which then rot Most severe in early to midsummer. May be confused with stem eelworm and onion white rot... 

Plant sensitivity to ozone, PAN, and other oxidants is conditioned by many factors. Genetic diversity between species and between cultivars within a species is well documented. The mechanism of genetic resistance is known for only one onion cultivar and is related to the effect of ozone on stomatal closure. Variants within a natural species are well known for several pine species, including white, loblolly, and ponderosa. 

Onion 14.3 Lettuce 18.1 Apples 20.6 Apples 11.2 White wine 19.2... 

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. 

Low pantothenic acid content (0.1-0 5 milligram/100 grams) Almond, apple, banana, bean (kidney), cabbage, grape, grapefruit, honey, lemon, lettuce, lobster, milk, molasses, onion, orange, oyster, peach, pear, pepper (white and sweet), pineapple, plum, potato, shrimp, tomato, turnip, veal, watercress. 

Development of suitable sample handling, extraction, and HPLC/diode array detector (DAD) based methods for the analysis of flavonoids and their conjugates in four varieties of onions were described (125). The predominant flavonoids in onions (white, brown, red, and pink varieties) were quercetin mono- and diglucosides, which accounted for approximately 80% of the total flavonol fraction. 

---