| Evaluation of various substances to prevent adsorption of tuberculin purified protein derivative (PPD) to glass surfaces. | |
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MedLine Citation:
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PMID: 5312323 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It is well known that a dilute tuberculin PPD solution (1 IU or 5 IU per dose) very rapidly loses its potency owing to adsorption of tuberculoprotein to the wall of the container into which it is dispensed. The amount of tuberculoprotein adsorbed per cm(2) of glass surface has been measured for phosphate-buffered saline over a wide pH range (pH 1 to pH 10). The maximum adsorption was found at pH 4 (0.31 mug/cm(2)) and the least at between pH 6 and pH 10 (0.15 mug/cm(2)). The rate of adsorption of tuberculoprotein to glass was not changed when the phosphate-buffered saline was replaced by borate-buffered saline. Tuberculin PPD prepared by the ammonium sulfate precipitation method, by the trichloroacetic acid precipitation method and by a combination of both methods adsorbed equally well to glass and no difference in the rate of adsorption for these tuberculoproteins was found.Forty-two substances in addition to Tween 80 were tested for their property to prevent adsorption of tuberculoprotein to glass in dilute tuberculin PPD solutions (50 IU/ml of (14)C-labelled PPD). The most efficient anti-adsorption agents were found to be nonionic surfactants, some ionic surfactants and some colloidal substances; polypeptides and non-surface-active substances of low molecular weight showed little or no anti-adsorption property.The labelling of PPD with (14)C has proved to be a valuable tool, particularly for long-term adsorption studies and for screening substances to be used as efficient anti-adsorption agents. These studies have permitted the selection of agents which could be added to dilute solutions of tuberculin PPD (10 IU/ml to 500 IU/ml or 0.2 mug/ml to 10 mug/ml respectively) in order to avoid loss of potency due to adsorption. |
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Authors:
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S Landi; H R Held; M C Tseng |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Bulletin of the World Health Organization Volume: 43 ISSN: 0042-9686 ISO Abbreviation: Bull. World Health Organ. Publication Date: 1970 |
Date Detail:
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Created Date: 1971-01-09 Completed Date: 1971-01-09 Revised Date: 2010-10-26 |
Medline Journal Info:
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Nlm Unique ID: 7507052 Medline TA: Bull World Health Organ Country: SWITZERLAND |
Other Details:
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Languages: eng Pagination: 91-106 Citation Subset: IM |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption* Carbon Isotopes Chemical Phenomena Chemistry Colloids Glass* Hydrogen-Ion Concentration Peptides Surface-Active Agents Tuberculin* |
| Chemical | |
Reg. No./Substance:
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0/Carbon Isotopes; 0/Colloids; 0/Peptides; 0/Surface-Active Agents; 0/Tuberculin |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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