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- W2073530644 abstract "Commercial cockroach extracts for diagnosis and therapy show batch-to-batch variation. This study aimed to standardize Periplaneta americana extract based on major IgE binding components using hypersensitive patients' sera. Extracts were prepared in phosphate buffered saline (PBS) or NH4HCO3, from freeze-dried or 37 °C dried material and compared with commercial extracts by immunobiochemical methods. Cockroach positive patients' sera were collected after intradermal tests and specific IgE enzyme linked immunosorbent assay (ELISA). Allergenic proteins were identified by western-blotting and potency of extracts determined by ELISA-inhibition. Adult P. americana extract from freeze dried source material in PBS (PA extract) resolved into 45 protein bands and showed 22 IgE binding components with pooled patients' sera. It required 9–12 ng self-proteins for 50% ELISA-inhibition. Individual patients' sera identified 23, 28, 35, 38, 40, 49, 72, 78 and 97 kDa as major IgE binding components in PA extract. Nymph extract exhibited similar potency and protein profile to PA extract with 72 and 78 kDa proteins present in high intensities. Commercial extracts exhibited only 6–11 IgE reactive bands compared to PA extract and required 40 folds or more protein for 50% ELISA-inhibition. PA extract from freeze-dried source material seems a potent allergen preparation with 9-major IgE binding components. It can be referred to upgrade the quality of commercial extracts exhibiting low potencies due to poor quality source material, inadequate extraction procedures and improper storage." @default.
- W2073530644 created "2016-06-24" @default.
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- W2073530644 date "2007-04-01" @default.
- W2073530644 modified "2023-10-03" @default.
- W2073530644 title "Biopotency and identification of allergenic proteins in Periplaneta americana extract for clinical applications" @default.
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- W2073530644 doi "https://doi.org/10.1016/j.biologicals.2006.07.004" @default.
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