Interfacial Properties of Mixed Polyethylene Glycol/Poly(d,l-lactide-co-glycolide) Films Spread at the Air/Water Interface

Langmuir ◽  
2000 ◽  
Vol 16 (4) ◽  
pp. 1861-1867 ◽  
Author(s):  
A. Malzert ◽  
F. Boury ◽  
P. Saulnier ◽  
J. P. Benoit ◽  
J. E. Proust
Keyword(s):  
Polyethylene Glycol ◽  
Interfacial Properties ◽  
Water Interface ◽  
Air Water Interface

Interfacial properties of poly(vinyl acetate) films: surface wave scattering at an air-water interface

1986 ◽  
Vol 19 (10) ◽  
pp. 2606-2612 ◽  
Author(s):  
Masami Kawaguchi ◽  
Masahito Sano ◽  
Yen Lane Chen ◽  
George Zografi ◽  
Hyuk Yu
Keyword(s):  
Surface Wave ◽  
Vinyl Acetate ◽  
Wave Scattering ◽  
Interfacial Properties ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Interfacial behaviour of bovine testis hyaluronidase

2006 ◽  
Vol 398 (3) ◽  
pp. 569-576 ◽  
Author(s):  
Silvia Belem-Gonçalves ◽  
Pascale Tsan ◽  
Jean-Marc Lancelin ◽  
Tito L. M. Alves ◽  
Vera M. Salim ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Hyaluronic Acid ◽  
Protein Adsorption ◽  
Pure Water ◽  
Interfacial Properties ◽  
Water Interface ◽  
Hyaluronidase Activity ◽  
Bovine Testicular Hyaluronidase ◽  
Air Water Interface ◽  
Testicular Hyaluronidase

The interfacial properties of bovine testicular hyaluronidase were investigated by demonstrating the association of hyaluronidase activity with membranes prepared from bovine testis. Protein adsorption to the air/water interface was investigated using surface pressure-area isotherms. In whichever way the interfacial films were obtained (protein injection or deposition), the hyaluronidase exhibited a significant affinity for the air/water interface. The isotherm obtained 180 min after protein injection into a pH 5.3 subphase was similar to the isotherm obtained after spreading the same amount of protein onto the same subphase, indicating that bovine testicular hyaluronidase molecules adopted a similar arrangement and/or conformation at the interface. Increasing the subphase pH from 5.3 to 8 resulted in changes of the protein isotherms. These modifications, which could correspond to the small pH-induced conformational changes observed by Fourier-transform IR spectroscopy, were discussed in relation to the pH influence on the hyaluronidase activity. Adding hyaluronic acid, the enzyme substrate, to the subphase tested the stability of the interfacial properties of hyaluronidase. The presence of hyaluronic acid in the subphase did not modify the protein adsorption and allowed substrate binding to a preformed film of hyaluronidase at pH 5.3, the optimal pH for the enzyme activity. Such effects of hyaluronic acid were not observed when the subphase was constituted of pure water, a medium where the enzyme activity was negligible. These influences of hyaluronic acid were discussed in relation to the modelled structure of bovine testis hyaluronidase where a hydrophobic region was proposed to be opposite of the catalytic site.

Interfacial properties of mixed films of long-chain organics at the air–water interface

2006 ◽  
Vol 40 (34) ◽  
pp. 6606-6614 ◽  
Author(s):  
Jessica B. Gilman ◽  
Heikki Tervahattu ◽  
Veronica Vaida
Keyword(s):  
Interfacial Properties ◽  
Water Interface ◽  
Air Water Interface ◽  
Mixed Films ◽  
Long Chain

Interfacial properties of a silicone copolymer demulsifier at the air/water interface

2004 ◽  
Vol 6 (7) ◽  
pp. 1570-1574 ◽  
Author(s):  
Delphine Daniel-David ◽  
Isabelle Pezron ◽  
Danièle Clausse ◽  
Christine Dalmazzone ◽  
Christine Noik ◽  
...  
Keyword(s):  
Interfacial Properties ◽  
Water Interface ◽  
Air Water Interface
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