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• W2024307551 abstract "Based on our research, the natural configuration of surfactant from birth through adulthood takes the form of intraalveolar bubbles. Thus, bubble film analysis would seem to be the specific in vitro testing method for lung surfactant. In the present study we report a battery of live in vitro tests for assessing structural and functional properties of surfactant bubbles and bubble films from hydrophobic extracts, namely, the therapeutic surfactants Survanta (SU) and Infasurf (IN) (full strength and diluted to 3 mg phospholipid/mL) and from aqueous extracts from rabbit lung lavage at 3 mg phospholipid/mL (SAM). Each substrate was assessed by: 1) Shake test: stable bubbles from SU, IN, and SAM (50/50, v/v in 95% ethanol) covered the peripheral surfaces, indicating positive response; bubble production by IN and SAM always exceeded SU; 2) Click test: bubble clicking began immediately in all preparations except for undiluted SU, in which the onset of clicking was delayed more than 40 sec; 3) Pattle's stability test: diameters of SU, IN, and SAM bubbles were unchanged for more than 20 min in aerated solution, indicating stable very low surface tension; 4) bubble generation by gas dispersion from a single capillary: full-strength concentration of SU and IN produced relatively large bubbles—bubble rate (number/min) and size were comparable; all SU bubbles rupture in <25 min, whereas IN bubbles were stable for >30 min; and 5) Exerowa black film method: in contrast with each of the preceding methods for studying intact bubbles, the Exerowa method focuses on the contact between bubble films and permits direct observation of film formation and determination of film structure. Stable black films were formed spontaneously by both IN (full strength and diluted) and SAM. Conversely, SU (full strength) formed no black films but stable rheological films. Diluted SU films ruptured in 50% of trials. Since methods 1, 2, and 3 were nondiscriminatory and method 4 produced unphysiologically large bubbles for most mammals, we concluded that the black film method of Exerowa is the most discriminating of the tests studied here. It provides a unique visual record of foam film formation and stability and clearly defines differences relative to both the nature and concentration of the preparations. Pediatr Pulmonol. 1996; 21:373–382. © 1996 Wiley-Liss, Inc." @default.
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• W2024307551 title "Rapid in vitro tests of surfactant film formation: Advantages of the Exerowa black film method" @default.
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