689 research outputs found
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Descriptors for terpene esters from chromatographic and partition measurements: Estimation of human odor detection thresholds
We have used gas chromatographic retention data together with other data to obtain Abraham descriptors for 30 terpene esters. These include the air-water partition coefficient, as log Kw, for which no experimental values are available for any terpene ester. The other descriptors are the ester dipolarity, S, the hydrogen bond basicity, B, (the ester hydrogen bond acidity is zero for the esters studied), and L the logarithm of the air-hexadecane partition coefficient. Both S and B are larger than those for simple aliphatic esters, as expected from the terpene ester structures that include ring systems and ethylenic double bonds. These descriptors can then be used to obtain a large number of physicochemical and environmental properties of terpene esters. We have analyzed experimental results on human odor detection thresholds and have constructed another equation for the calculation of these thresholds, to go with a previous equation that we have reported. Then the descriptors for terpene esters can be used to estimate the important odor detection thresholds
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Commentary on “Studies on Molar Volume, Dielectric Properties and Refractive Indices of Cyanex 923 + Benzene/Xylene at 300 K”
This article provides a commentary on Redlich-Kister equation coefficients for binary benzene + cyanex 923 and xylene + cyanex 923
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Commentary on “Experimental Measurements and Equilibrium Study of Functional D-Sorbitol in Good and Anti-Solvent Binary Mixtures”
This article provides a commentary on the published equation coefficients for mathematically describing the solubility behavior of D-sorbitol in binary acetonitrile + ethanol solvent mixtures using the modified Apelblat, Combined Nearly Ideal Binary Solvent/Redlich-Kister (CNIBS/R-K) and Jouyban-Acree models
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Commentary on “Extended Hildebrand Approach: An Empirical Model for Solubility Prediction of Etodolac in 1,4-Dioxane and Water Mixtures”
This article provides a commentary on mathematical errors concerning the incorrect conversion of mass fraction to volume fraction concentrations of 1,4-dioxane, the incorrect conversion of mole fraction solubilities to molar solubilities of Etodolac, and the incorrect calculation of the ideal mole fraction solubility of Etodolac
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Commentary on “Uncover the Effect of Solvent and Temperature on Solid-Liquid Equilibrium Behavior of L-Norvaline”
This article provides a commentary on several sets of reported curve-fit parameters for the Modified Apelblat model that do not correctly back-calculate the observed solubility behavior of L-norvaline in the binary aqueous-alcohol solvent mixtures
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Comments Regarding "Study of Molecular Interactions in Binary Mixtures of Formamide with 2-Methoxyethanol and 2-Ethoxyethanol at Varying Temperatures"
This article provides comments on "Study of Molecular Interactions in Binary Mixtures of Formamide with 2-Methoxyethanol and 2-Ethoxyethanol at Varying Temperatures," published in 'Physics and Chemistry of Liquids,' 2013
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Comments on "Solubility and Dissolution Thermodynamic Data of Cefpiramide in Pure Solvents and Binary Solvents"
Abstract: Errors are found in the mathematical correlation based on the combined Jouyban-Acree and Modified Apelblat model for describing the variation in the mole fraction solubility of cefpiramide with temperature and solvent composition for the binary aqueous-ethanol solvent system. The equation coefficents given by Tang and coworkers, when substituted into the model equation, do not yield the authors' calculated mole fraction solubilities of cefpiramide
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Solubility Data Series
This book is part of the Solubility Data Series and discusses polycyclic aromatic hydrocarbons and binary non-aqueous systems in solutes A - E
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Commentary on "Effect of β-alanine and the solvent composition on the solubility of solvate of calcium D-pantothenate containing four molecules of methanol and one molecule of water (D-PC·4MeOH·1H₂O)"
This article points out problems associated with two of the mathematical treatments used by authors Han et al. (2017) for the solubility behavior of calcium D-panthenate solvate as the mole fraction concentration β-alanine approaches zero
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