Lettuce and Its legend.
Contents
Other reactions and Uses.:
Occupational eczema or contact dermatitis has been reported, including contact hypersensitivity to Lettuce in a chef.
Other substances or allergens may be present that result in adverse effects. Powdered Latex glove use in salad preparation may result in measurable amounts of Latex protein on Lettuce, with an exposure-dependent increase in the Latex protein levels. Sulphite-treated Lettuce (sulphite is used as a preservative) is capable of provoking bronchospasm in sulphite-sensitive asthmatics and may be a cause of restaurant-provoked asthma in these individuals.
Lettuce contains high levels of naturally occurring nitrates.
Other Uses:
Hair; Parasiticide.
Parasiticide. No further details are given, but it is probably the sap of flowering plants that is used.
The seed is said to be used to make hair grow on scar tissue.
Allergens:
Four protein bands with molecular weights of 50, 43, 39 and 16 kDa have been detected in Lettuce and exhibited IgE-binding properties. A second study reported detecting 14 allergens in Iceberg Lettuce between 13 and > 113 kDa. However, no allergens from this plant have yet been fully characterised.
Potential Cross-ReactivityAn extensive cross-reactivity among the different individual species of the genus could be expected, as well as to a certain degree among members of the family Asteraceae.
A patient allergic to Chicory reported reactions to botanically related Endive (Cichorium endivia) and Lettuce (Lactuca sativa). No cross-reactivity was found with pollen from Mugwort, a member of the same family. This is contradicted by a report of subjects allergic to Artemisia, who appeared to be at a higher risk of concomitant sensitisation to various foods, including Lettuce. A common allergen may be responsible.
RAST inhibition demonstrated that Carrot does share allergens with Lettuce, although Carrot allergens are more potent than those of Lettuce.
One study concludes that cross-reactivity was observed between Platanus acerifolia pollen and plant-derived foods. OAS in these patients may have been caused by primary respiratory sensitisation to Plane tree pollen, and the authors propose profilin as the cause.
Lettuce Witches' Ointments:
Since the Middle Ages, lettuce (L. virosa) has been an ingredient in Witches' Ointments and the source of lactucarium or 'lettuce opium'. This 'opium' is obtained by drying the white sap contained in the stalk" (R?tsch 107).
Reference:
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- 1.Lettuce and Its legend.
Article Information:
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