MIT-HOL kerdes [2614]:

[Drotos Laszlo]

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At 10:01 2001.03.02. -0000, you wrote:
>Kerdes: A kovetkezo cikk cime erdekel:
>Y. L. Loukas, E. A. Vyza and A. P. Valiraki
>Analyst 1995 120 333-338


Itt van a teljes cim es a cikk kivonata:


LOUKAS YL, VYZA EA, VALIRAKI AP:

INCLUSION COMPLEXES AND STABILITY STUDIES OF AN ORGANOPHOSPHOROUS INSECTICIDE
WITH CYCLODEXTRINS - SPECTROPHOTOMETRIC AND KINETIC DETERMINATION OF STABILITY
CONSTANT

ANALYST 120 (2): 533-538 FEB 1995.  ISSN: 0003-2654



Abstract:

DCPE [alpha-(diethoxyphosphinoximino)dicyclopropylmethane] is a potent
organophosphorous insecticide. It is an oily liquid and therefore
the most suitable formulation is an 'emulsifiable concentrate'. In
an attempt to develop better formulations, complexes of this insecticide
with the cyclodextrins (CDs) alpha CD, beta CD and hydroxypropyl-beta
CD  (HP-beta CD) were examined. Stability constants were determined
spectrophotometrically, in the case of DCPE-beta CD, according to the
spectral changes of DCPE due to the complexation and kinetically,in the
case of DCPE-HP-beta CD, according to the changes in the rate constant
of DCPE degradation. HP-beta CD has a stabilizing effect on DCPE by
decelerating its degradation in aqueous solutions, but alpha CD and
beta CD have no effect. Finally, the thermodynamic parameters for the
inclusion complex formation between DCPE and HP-beta CD in aqueous
solutions were calculated by correlating the changes in the stability
constant with temperature.


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