A comparative study on chemiluminescence propperties of some inorganic systems

Chemiluminescence (CL) of selected inorganic reaction systems, generating ultraweak photon emission, has been studied. The kinetics of the systems and their emission spectra have been characterised by measurements with the use of the stationary and the flow methods of CL recording. The systems studied contained cations at different oxidation degree such asFe2+\3+,Cu+\2+,Co2+\3+,Eu2+\3+,CLO−anions and hydrogen peroxide without organic sensitisers. On the basis of the analysis of the spectra, in particular systems emitters have been identified and mechanisms of the reactions have been proposed. The effect of carbonate and azide ions and propylene carbonate on the yield of CL and spectral characterisation of the systems studied has been evidenced and discussed. A possibility of the application of the systemsEu3+\N3−\H2O2andCo2+\propylene carbonate\H2O2for analytical purposes has been considered.

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Hygroscopic/Hydrolytic Kinetics of Two Bulk-fill Resin Composite Restorative Materials Stored in Different Media: An inVitro Comparative Study

Egyptian Dental Journal ◽

10.21608/edj.2018.79357 ◽

2018 ◽

Vol 64 (4) ◽

pp. 3823-3831

Author(s):

Nadia Zaghloul

Keyword(s):

Comparative Study ◽

Resin Composite ◽

Restorative Materials ◽

Kinetics Of

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Investigation of the kinetics of catalytic decomposition of hydrogen peroxide depending on the solution phase state

Journal of Water Chemistry and Technology ◽

10.3103/s1063455x09020015 ◽

2009 ◽

Vol 31 (2) ◽

pp. 71-80

Author(s):

N. A. Mishchuk ◽

L. L. Lysenko ◽

O. V. Zayats

Keyword(s):

Hydrogen Peroxide ◽

Phase State ◽

Catalytic Decomposition ◽

Solution Phase ◽

Kinetics Of

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Comparative Study of Chemical Stability of Two H1Antihistaminic Drugs, Terfenadine and ItsIn VivoMetabolite Fexofenadine, Using LC-UV Methods

Journal of Analytical Methods in Chemistry ◽

10.1155/2019/5790404 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10

Author(s):

Anna Gumieniczek ◽

Anna Berecka-Rycerz ◽

Rafał Pietraś ◽

Izabela Kozak ◽

Karolina Lejwoda ◽

...

Keyword(s):

Comparative Study ◽

Chemical Stability ◽

First Order ◽

First Order Kinetics ◽

Kinetics Of Degradation ◽

Effects Of Temperature ◽

High Doses ◽

Antihistaminic Drugs ◽

Kinetics Of

A comparative study of chemical stability of terfenadine (TER) and itsin vivometabolite fexofenadine (FEX) was performed. Both TER and FEX were subjected to high temperature at different pH and UV/VIS light at different pH and then quantitatively analyzed using new validated LC-UV methods. These methods were used to monitor the degradation processes and to determine the kinetics of degradation for both the compounds. As far as the effects of temperature and pH were concerned, FEX occurred more sensitive to degradation than TER. As far as the effects of UV/VIS light and pH were concerned, the both drugs were similarly sensitive to high doses of light. Using all stress conditions, the processes of degradation of TER and FEX followed the first-order kinetics. The results obtained for these two antihistaminic drugs could be helpful in developing their new derivatives with higher activity and stability at the same time.

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