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2.1. PHASE SOLUBILITY STUDIES
The solubility studies were carried out according to the method reported by Higuchi
and Connors [3]. Excess of 2,4-D (50 and 20 mg for the - and -CD assays,
respectively) were accurately weighed into 50 mL Erlenmeyer flasks, adding 10
mL of unbuffered water containing increasing concentrations of -CD (0.01¨C0.1
M range) and -CD (0.002¨C0.030 M range). In the -CD system, with the purpose
of making the curve asymptotic, it was necessary to add an excess of -CD much
greater than the solubility limit (0.016 M). These flasks were sealed and shaken
at 25 C for one week. After equilibrium, the samples were filtered with a syringe
through a 0.22 mMillipore cellulose nitrate membrane filter, properly diluted and
analysed spectrophotometrically at 284 nm (Hitachi U-2000).

results£º
3.1. PHASE SOLUBILITY STUDIES
The phase solubility diagrams obtained for 2,4-D with 1- and 2-CD are shown in
Figure 1. According to Higuchi and Connors, both diagrams can be classified as
BS type. An insoluble microcrystalline complex was formed from the solution at
0.020 M for the 1-CD system and 0.009 M for the 2-CD one.
Therefore, the 2,4-D content of the precipitated complex (Sc) is equal to the
difference between the total amount of 2,4-D added to the system (ST) and the
pesticide in solution when the plateau region is reached (SM). The CD content in
the complex (Lc), corresponds to the CD concentration during the plateau region.
So, the precipitated complex stoichiometry could be expressed as follows:
R D Sc=Lc: (1)
Table I reports the different calculated values from the solubility assay for both
systems.
The precipitates have the stoichiometries SL2 for the 1-CD complex (two 1-
CD molecules are involved for the inclusion of one 2,4-D molecule) and SL for
the 2-CD complex.

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ÎÄÏ׳ö´¦£ºJournal of Inclusion Phenomena and Macrocyclic Chemistry 37: 171¨C178, 2000.
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