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Use of 'soluble lipids' for biochemical processes: linoleic acid-cyclodextrin inclusion complexes in aqueous solutions.

ABSTRACT: The equilibria of linoleic acid (LA)-cyclodextrin (CD) complexes were studied to investigate the behaviour of 'soluble lipids' in solution as a function of factors that typically affect biochemical processes, such as pH, temperature and CD structure. The above complexes are formed with a stoicheiometry of 1:2 in solution. The first CD molecule interacts with LA through hydrogen bonds when the pH is below the fatty acid pK; hydrophobic interactions may also play an important role at high pH. The second CD molecule makes only hydrophobic contact with the LA hydrocarbon chain. The formation of hydrogen bonds is dependent on the inner diameter of the CD whereas the strength of the hydrophobic interactions between CD and LA can be related to the presence of hydrophobic groups in the CD. The first CD molecule interacts more strongly with LA at increased temperatures. The quantitative description of the LA-CD interaction allows absolute control of the effects produced by the lipid on biochemical processes.

SUBMITTER: Lopez-Nicolas JM

PROVIDER: S-EPMC1136856 | biostudies-other | 1995 May

REPOSITORIES: biostudies-other

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Project description:BackgroundIn this study we investigated the predictability of three thermodynamic quantities related to complex formation. As a model system we chose the host-guest complexes of beta-cyclodextrin (beta-CD) with different guest molecules. A training dataset comprised of 176 beta-CD guest molecules with experimentally determined thermodynamic quantities was taken from the literature. We compared the performance of three different statistical regression methods - principal component regression (PCR), partial least squares regression (PLSR), and support vector machine regression combined with forward feature selection (SVMR/FSS) - with respect to their ability to generate predictive quantitative structure property relationship (QSPR) models for DeltaG degrees, DeltaH degrees and DeltaS degrees on the basis of computed molecular descriptors.ResultsWe found that SVMR/FFS marginally outperforms PLSR and PCR in the prediction of DeltaG degrees, with PLSR performing slightly better than PCR. PLSR and PCR proved to be more stable in a nested cross-validation protocol. Whereas DeltaG degrees can be predicted in good agreement with experimental values, none of the methods led to comparably good predictive models for DeltaH degrees. In using the methods outlined in this study, we found that DeltaS degrees appears almost unpredictable. In order to understand the differences in the ease of predicting the quantities, we performed a detailed analysis. As a result we can show that free energies are less sensitive (than enthalpy or entropy) to the small structural variations of guest molecules. This property, as well as the lower sensitivity of DeltaG degrees to experimental conditions, are possible explanations for its greater predictability.ConclusionThis study shows that the ease of predicting DeltaG degrees cannot be explained by the predictability of either DeltaH degrees or DeltaS degrees. Our analysis suggests that the poor predictability of TDeltaS degrees and, to a lesser extent, DeltaH degrees has to do with a stronger dependence of these quantities on the structural details of the complex and only to a lesser extent on experimental error.

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Use of 'soluble lipids' for biochemical processes: linoleic acid-cyclodextrin inclusion complexes in aqueous solutions.

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