extract

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extract

 [ek´strakt]
a concentrated preparation of a vegetable or animal drug.
allergenic extract an extract of allergenic components from a crude preparation of an allergen, such as weed, grass, or tree pollen, molds, house dust, or animal dander, used for diagnostic skin testing or for immunotherapy for allergy.
cell-free extract the solution obtained by rupturing cells and removing all particulate matter.

ex·tract

(eks-trakt'),
1. A concentrated preparation of a drug obtained by removing the active constituents of the drug with suitable solvents, evaporating all or nearly all of the solvent, and adjusting the residual mass or powder to the prescribed standard.
2. To remove part of a mixture with a solvent.
3. To perform extraction.
[L. ex-traho, pp. -tractus, to draw out]

extract

(ĭk-străkt′)
tr.v. ex·tracted, ex·tracting, ex·tracts
To draw or pull out, often with great force or effort: extract a wisdom tooth; used tweezers to extract the splinter.

ex·tract′a·ble, ex·tract′i·ble adj.
ex·trac′tor n.

extract

noun A concentrate of a drug, cells or a supernatant.

verb To obtain a thing—often concentrated or distilled—from a source.

extract

noun A concentrate of a drug, cells, or a supernatant. See Adrenal extract, Cell-free extract, Fluid extract, Green extract, Plasmid extract verb Psychology Obtain.

ex·tract

1. (ek'strakt) A concentrated preparation of a drug obtained by removing the active constituents with suitable solvents, evaporating all or nearly all of the solvent, and adjusting the residual mass or powder to the prescribed standard.
2. (ek-strakt') To remove part of a mixture with a solvent.
3. To perform extraction.
[L. ex-traho, pp. -tractus, to draw out]

ex·tract

(eks-trakt, ekstrakt)
1. To perform extraction.
2. A concentrated drug preparation obtained by removing active constituents of the drug with suitable solvents, evaporating all or nearly all solvent, and adjusting residual mass or powder to the prescribed standard.
[L. ex-traho, pp. -tractus, to draw out]
References in periodicals archive ?
This is rather critical, since many people doing off-label sublingual immunotherapy using multiple allergen extracts think that they know what they're doing.
Altogether, our results showed that allergen-specific IgG antibodies purified from mite-allergic patient sera using available and standardized methodology are able to inhibit IgE reactivity to Dpt allergen extract. This approach reinforces that the intermittent measurement of serum allergenspecific IgG antibodies will be an important objective laboratorial parameter that will help specialists to follow their patients under allergen-specific immunotherapy.
Grass allergen extracts, canine sera, and affinity-purified goat anti-canine IgE were kindly provided by Bill Mandy, BioMedical Services.
Efficacy and safety of sublingual tablets of house dust mite allergen extracts: Results of a dose-ranging study in an environmental exposure chamber.
SPT was performed using commercially available allergen extracts of 18 common aeroallergens and the frequency of each of them was noted ((Table-3).
The evaluation results of the SPTs depended on the distance in between the applied allergens, the appropriate body part used for allergen application, types of instruments used (lancet or multi-test applicator), test season, and quality of the allergen extracts. The skin prick test is quite reliable in determining the specific allergy when the technique is correctly applied and evaluated by an experienced person (8, 9).
Its administration includes increasing the doses of allergen extracts over a span of time either through injections or sublingual tablets and drops.
The message of this review is that we need more large randomized trials with better controls, modern high-quality allergen extracts that have proven themselves in other allergic diseases, and patient-centered outcome measures," according to Dr.
Skin prick tests were done for all participants with commercial allergens, including: epithelial allergens of a cat, cattle, dog, goat, gerbil, hamster, horse, rabbit, rat and mouse; bird feather allergens of a canary, chicken, duck, goose and parakeet, and allergen extracts of 2 species of mites, Dermatophagoides pteronyssinus and Dermatophagoides farina (GREER, USA).
The aim of immunotherapy is to induce long-term tolerance and consists of repeated injections of small doses of allergen extracts in order to reduce symptoms on subsequent exposure and to improve quality of life.
This treatment requires tiny injections of purified allergen extracts.
The IDT results of 62 allergen extracts on 3,335 patients in a three-year period (2001-2003) are shown in Figure 1 (children less than three years old were excluded).