Rebuttal to communication critical of the use of pressure perturbation calorimetry for measuring volumetric properties of solutes

2004 ◽  
Vol 414 (1) ◽  
pp. 95-100 ◽  
Author(s):  
John F. Brandts ◽  
Lung-Nan Lin
Keyword(s):  
Volumetric Properties ◽  
Pressure Perturbation ◽  
Pressure Perturbation Calorimetry

Determination of the Volumetric Properties of Proteins and Other Solutes Using Pressure Perturbation Calorimetry

2002 ◽  
Vol 302 (1) ◽  
pp. 144-160 ◽  
Author(s):  
Lung-Nan Lin ◽  
John F. Brandts ◽  
J.Michael Brandts ◽  
Valerian Plotnikov
Keyword(s):  
Volumetric Properties ◽  
Pressure Perturbation ◽  
Pressure Perturbation Calorimetry

Pressure Perturbation Calorimetric Studies on Phospholipid-Sterol Mixtures

2008 ◽  
Vol 63 (6) ◽  
pp. 769-778 ◽  
Author(s):  
Linus Okoro ◽  
Roland Winter
Keyword(s):  
Structural Changes ◽  
Ring Structure ◽  
Melting Transition ◽  
Volumetric Properties ◽  
Differential Scanning Calorimetric ◽  
Pressure Perturbation ◽  
Dsc Measurements ◽  
Pressure Perturbation Calorimetry ◽  
Acyl Chains ◽  
Calorimetric Studies

Sterols regulate biological processes and sustain the lateral structure of cellular membranes. The sterol cholesterol, its precursor lanosterol, the plant sterols stigmasterol and ergosterol as well as 7-dehydrocholesterol were added up to 36 mol-% to vesicles of the phospholipid 1,2-dipalmitoyl-snglycero- 3-phosphatidylcholine (DPPC). The aim of this study was to investigate the influence of the sterol side chain and ring structure on the volumetric properties of the lipid bilayer system by using pressure perturbation calorimetry (PPC), a relatively new and efficient technique, to study the thermal expansion coefficient and volumetric properties of biomolecules. The experiments were carried out in the temperature range from 10 to 85 °C, i. e., at temperatures below and above the chain-melting transition temperatures of the lipid mixtures. Additionally, corresponding differential scanning calorimetric (DSC) measurements were carried out.Whereas the conformational properties of the different sterols have a significant effect on the order parameter of the lipid acyl-chains, the thermodynamic parameters of these sterols are less influenced by the differential structural changes of the sterols. For lanosterol and stigmasterol, marked differences are found, however.

Pressure Perturbation Calorimetry

2003 ◽  
pp. 477-480
Author(s):  
H. Heerklotz ◽  
R. Winter ◽  
C. Royer ◽  
J. Seelig
Keyword(s):  
Pressure Perturbation ◽  
Pressure Perturbation Calorimetry

scholarly journals A study of the relationship between water and anions of the Hofmeister series using pressure perturbation calorimetry

2015 ◽  
Vol 17 (21) ◽  
pp. 14130-14137 ◽  
Author(s):  
Jordan W. Bye ◽  
Robert J. Falconer
Keyword(s):  
Hofmeister Series ◽  
Pressure Perturbation ◽  
Sodium Salts ◽  
Pressure Perturbation Calorimetry ◽  
The Relationship

Pressure perturbation calorimetry (PPC) was used to study the relationship between water and sodium salts with a range of different anions.

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