Thermodynamic Characterization of Temperature-Induced Micellization and Demicellization of Detergents Studied by Differential Scanning Calorimetry

Langmuir ◽  
2001 ◽  
Vol 17 (13) ◽  
pp. 3844-3851 ◽  
Author(s):  
Pinaki R. Majhi ◽  
Alfred Blume
Keyword(s):  
Differential Scanning Calorimetry ◽  
Scanning Calorimetry ◽  
Thermodynamic Characterization

ChemInform Abstract: Thermodynamic Characterization of C60 by Differential Scanning Calorimetry.

ChemInform ◽  
2010 ◽  
Vol 23 (38) ◽  
pp. no-no
Author(s):  
Y. JIN ◽  
J. CHENG ◽  
M. VARMA-NAIR ◽  
G. LIANG ◽  
Y. FU ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Scanning Calorimetry ◽  
Thermodynamic Characterization

Thermodynamic characterization of fullerene (C60) by differential scanning calorimetry

1992 ◽  
Vol 96 (12) ◽  
pp. 5151-5156 ◽  
Author(s):  
Yimin Jin ◽  
Jinlong Cheng ◽  
Manika Varma-Nair ◽  
Guanghe Liang ◽  
Yigang Fu ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fullerene C60 ◽  
Scanning Calorimetry ◽  
Thermodynamic Characterization

scholarly journals Effect of irreversibility on the thermodynamic characterization of the thermal denaturation of Aspergillus saitoi acid proteinase

1995 ◽  
Vol 311 (3) ◽  
pp. 969-974 ◽  
Author(s):  
S R Tello-Solis ◽  
A Hernandez-Arana
Keyword(s):  
Molecular Structure ◽  
Differential Scanning Calorimetry ◽  
Equilibrium Constant ◽  
Thermal Denaturation ◽  
Acid Proteinase ◽  
Scanning Calorimetry ◽  
Thermodynamic Characterization ◽  
A Value ◽  
Van’T Hoff Enthalpy

The thermal denaturation of the acid proteinase from Aspergillus saitoi was studied by CD and differential scanning calorimetry (DSC). This process seemed to be completely irreversible, as protein samples that were heated to temperatures at which the transition had been completed and then cooled at 25 degrees C did not show any reversal of the change in the CD signal. Similar results were obtained with DSC. Nevertheless, we were able to detect the presence of reversibly unfolded species in experiments in which the enzyme solution was heated to a temperature within the transition region, followed by rapid cooling at 25 degrees C. Accordingly, the denaturation of behaviour of the acid proteinase seems to be consistent with the existence of one (or more) reversible unfolding transition followed by an irreversible step. The van't Hoff enthalpy, delta HvH, which corresponds to the reversible transition was calculated from extrapolation to infinite heating rate as 310 kJ.mol-1. This parameter was also determined from direct estimation of the equilibrium constant at several temperatures (delta HvH = 176 kJ.mol-1). Comparison of the average delta HvH with the calorimetric enthalpy (delta Hcal. = 770 kJ.mol-1) gave a value of 3.2 for the delta Hcal./delta HvH ratio, indicating that the molecular structure of the enzyme is probably formed by three or four cooperative regions, a number similar to that of the acid proteinase, pepsin. It should be noted that a completely different conclusion would be obtained from a straightforward analysis of the calorimetric curves, disregarding the effect of irreversibility on the denaturation process.

Gelatin and Glycerine-Based Bioadhesive Vaginal Hydrogel

2020 ◽  
Vol 17 (4) ◽  
pp. 303-311
Author(s):  
Roberta Cassano ◽  
Federica Curcio ◽  
Delia Mandracchia ◽  
Adriana Trapani ◽  
Sonia Trombino
Keyword(s):  
Differential Scanning Calorimetry ◽  
Inflammatory Process ◽  
Vaginal Mucosa ◽  
Vaginal Infection ◽  
Scanning Calorimetry ◽  
Time Intervals ◽  
Site Specific ◽  
Release Studies ◽  
Hiv Seropositive

Aim: The work’s aim was the preparation and characterization of a hydrogel based on gelatin and glycerine, useful for site-specific release of benzydamine, an anti-inflammatory drug, able to attenuate the inflammatory process typical of the vaginal infection. Objective: The obtained hydrogel has been characterized by Electronic Scanning Microscopy (SEM) and Differential Scanning Calorimetry (DSC). In addition, due to the precursor properties, the hydrogel exhibits a relevant mucoadhesive activity. Methods: The swelling degree was evaluated at two different pHs and at defined time intervals. In particular, phosphate buffers were used at pH 6.6, in order to mimic the typical conditions of infectious diseases at the vaginal level, particularly for HIV-seropositive pregnant women, and pH 4.6, to simulate the physiological environment. Results: The obtained results revealed that the hydrogel swells up well at both pHs. Conclusion: Release studies conducted at both pathological and physiological pHs have shown that benzydamine is released at the level of the vaginal mucosa in a slow and gradual manner. These data support the hypothesis of the hydrogel use for the site-specific release of benzydamine in the vaginal mucosa.

scholarly journals Identification of LDPE Grades Focusing on Specific CH2 Raman Vibration Modes

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Richard Jumeau ◽  
Patrice Bourson ◽  
Michel Ferriol ◽  
François Lahure ◽  
Marc Ponçot ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Raman Spectroscopy ◽  
Vibrational Spectroscopy ◽  
Phenomenological Model ◽  
Low Density ◽  
Vibration Modes ◽  
Scanning Calorimetry ◽  
Lamella Thickness ◽  
Poly Ethylene

The possibilities of applications of vibrational spectroscopy techniques (Raman spectroscopy) in the analysis and characterization of polymers are more and more used and accurate. In this paper, our purpose is to characterize Low Density Poly(Ethylene) (LDPE) grades by Raman spectroscopy and in particular with CH2 Raman vibration modes. With temperature measurements, we determine different amorphous and crystalline Raman assignments. From these results and on the basis of the evolution of CH2 bending Raman vibration modes, we develop a phenomenological model in correlation with Differential Scanning Calorimetry and in particular with crystalline lamella thickness determination.

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