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Masao Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Abstract Solid–liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Δ- and ω-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Solid-liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Delta- and omega-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 1 oleic acid stearic acid and oleic acid behenic acid mixtures
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Reiri Yamamoto, Masao Suzuki
    Abstract:

    Solid-liquid phase behavior of binary fatty acid mixtures was investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR) for the mixture composed of oleic acid (OA) and stearic acid (SA) and that composed of OA and behenic acid (BA). The DSC results provided a monotectic type T-X phase diagram for these mixtures, from which it was suggested that the two fatty acid species are completely immiscible in a solid phase regardless of the two polymorphs of OA, i.e., alpha-form or gamma-form. The solid phase immiscibility was confirmed by the FT-IR observation that the spectra obtained for the mixtures correspond to the superposition of the two spectra for respective components. Thermodynamic analysis of Liquidus Line demonstrated that OA and SA form an ideal mixture in a liquid phase, whereas the mixing of OA and BA in a liquid phase is slightly non-ideal.

  • solid liquid phase behavior of binary fatty acid mixtures 2 mixtures of oleic acid with lauric acid myristic acid and palmitic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Ruri Ishikawa, Masao Suzuki
    Abstract:

    Abstract Solid–liquid phase behavior was investigated for binary fatty acid mixtures composed of oleic acid (OA; cis-9-octadecenoic acid) and saturated fatty acids, lauric acid (LA; dodecanoic acid), myristic acid (MA; tetradecanoic acid), and palmitic acid (PA; hexadecanoic acid), by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR). When the mixture was heated immediately after the solidification from the melt, the heat effect due to the γ-to-α transformation of OA varied depending on the composition of the mixture. However, the mixture subjected to an annealing at the temperature slightly below the melting temperature provided the transformation at constant temperature which corresponds to the γ-to-α transformation temperature of pure OA. This suggests that a solid phase formed by cooling of the melt of the mixture is not in an equilibrium state, but it relaxes to a stable solid during the annealing process. The T–X phase diagrams of these mixtures constructed from the DSC measurements demonstrate that the two fatty acid species are completely immiscible in a solid phase regardless of the type of polymorphs of OA, α- or γ-form. According to a thermodynamic analysis of Liquidus Line basing on the regular solution model for the melt, the non-ideality of mixing tends to increase with the decrease in the acyl chain length of the saturated fatty acid, although the mixing is rather close to ideal.

Tohru Inoue - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Abstract Solid–liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Δ- and ω-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Solid-liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Delta- and omega-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 1 oleic acid stearic acid and oleic acid behenic acid mixtures
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Reiri Yamamoto, Masao Suzuki
    Abstract:

    Solid-liquid phase behavior of binary fatty acid mixtures was investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR) for the mixture composed of oleic acid (OA) and stearic acid (SA) and that composed of OA and behenic acid (BA). The DSC results provided a monotectic type T-X phase diagram for these mixtures, from which it was suggested that the two fatty acid species are completely immiscible in a solid phase regardless of the two polymorphs of OA, i.e., alpha-form or gamma-form. The solid phase immiscibility was confirmed by the FT-IR observation that the spectra obtained for the mixtures correspond to the superposition of the two spectra for respective components. Thermodynamic analysis of Liquidus Line demonstrated that OA and SA form an ideal mixture in a liquid phase, whereas the mixing of OA and BA in a liquid phase is slightly non-ideal.

  • solid liquid phase behavior of binary fatty acid mixtures 2 mixtures of oleic acid with lauric acid myristic acid and palmitic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Ruri Ishikawa, Masao Suzuki
    Abstract:

    Abstract Solid–liquid phase behavior was investigated for binary fatty acid mixtures composed of oleic acid (OA; cis-9-octadecenoic acid) and saturated fatty acids, lauric acid (LA; dodecanoic acid), myristic acid (MA; tetradecanoic acid), and palmitic acid (PA; hexadecanoic acid), by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR). When the mixture was heated immediately after the solidification from the melt, the heat effect due to the γ-to-α transformation of OA varied depending on the composition of the mixture. However, the mixture subjected to an annealing at the temperature slightly below the melting temperature provided the transformation at constant temperature which corresponds to the γ-to-α transformation temperature of pure OA. This suggests that a solid phase formed by cooling of the melt of the mixture is not in an equilibrium state, but it relaxes to a stable solid during the annealing process. The T–X phase diagrams of these mixtures constructed from the DSC measurements demonstrate that the two fatty acid species are completely immiscible in a solid phase regardless of the type of polymorphs of OA, α- or γ-form. According to a thermodynamic analysis of Liquidus Line basing on the regular solution model for the melt, the non-ideality of mixing tends to increase with the decrease in the acyl chain length of the saturated fatty acid, although the mixing is rather close to ideal.

Yusuke Hisatsugu - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Abstract Solid–liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Δ- and ω-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Solid-liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Delta- and omega-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 1 oleic acid stearic acid and oleic acid behenic acid mixtures
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Reiri Yamamoto, Masao Suzuki
    Abstract:

    Solid-liquid phase behavior of binary fatty acid mixtures was investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR) for the mixture composed of oleic acid (OA) and stearic acid (SA) and that composed of OA and behenic acid (BA). The DSC results provided a monotectic type T-X phase diagram for these mixtures, from which it was suggested that the two fatty acid species are completely immiscible in a solid phase regardless of the two polymorphs of OA, i.e., alpha-form or gamma-form. The solid phase immiscibility was confirmed by the FT-IR observation that the spectra obtained for the mixtures correspond to the superposition of the two spectra for respective components. Thermodynamic analysis of Liquidus Line demonstrated that OA and SA form an ideal mixture in a liquid phase, whereas the mixing of OA and BA in a liquid phase is slightly non-ideal.

  • solid liquid phase behavior of binary fatty acid mixtures 2 mixtures of oleic acid with lauric acid myristic acid and palmitic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Ruri Ishikawa, Masao Suzuki
    Abstract:

    Abstract Solid–liquid phase behavior was investigated for binary fatty acid mixtures composed of oleic acid (OA; cis-9-octadecenoic acid) and saturated fatty acids, lauric acid (LA; dodecanoic acid), myristic acid (MA; tetradecanoic acid), and palmitic acid (PA; hexadecanoic acid), by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR). When the mixture was heated immediately after the solidification from the melt, the heat effect due to the γ-to-α transformation of OA varied depending on the composition of the mixture. However, the mixture subjected to an annealing at the temperature slightly below the melting temperature provided the transformation at constant temperature which corresponds to the γ-to-α transformation temperature of pure OA. This suggests that a solid phase formed by cooling of the melt of the mixture is not in an equilibrium state, but it relaxes to a stable solid during the annealing process. The T–X phase diagrams of these mixtures constructed from the DSC measurements demonstrate that the two fatty acid species are completely immiscible in a solid phase regardless of the type of polymorphs of OA, α- or γ-form. According to a thermodynamic analysis of Liquidus Line basing on the regular solution model for the melt, the non-ideality of mixing tends to increase with the decrease in the acyl chain length of the saturated fatty acid, although the mixing is rather close to ideal.

Liqiang Zheng - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Abstract Solid–liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Δ- and ω-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

  • solid liquid phase behavior of binary fatty acid mixtures 3 mixtures of oleic acid with capric acid decanoic acid and caprylic acid octanoic acid
    Chemistry and Physics of Lipids, 2004
    Co-Authors: Tohru Inoue, Yusuke Hisatsugu, Masao Suzuki, Zhining Wang, Liqiang Zheng
    Abstract:

    Solid-liquid phase behavior of binary mixtures of oleic acid (OA)/capric acid (C10A) and OA/caprylic acid (C8A) were investigated by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction. The phase diagram of OA/C10A mixture constructed from the DSC results suggested that a molecular compound with the composition of OA:C10A = 3:2 is formed in a solid phase, and OA and the molecular compound are miscible, while C10A and the molecular compound are completely immiscible. The formation of the molecular compound was supported by the IR spectroscopic observation, and a possible model of the structure was proposed on the basis of X-ray diffraction spectrum in small angle region. This compound formation is characteristic of the OA/C10A mixture, and may be attributed to the similarity of the acyl chain length of C10A to the lengths of Delta- and omega-chains of OA (i.e., the chain segments divided by cis-double bond). The mixture of OA and C8A, whose chain length is close to but shorter than the two chain segments of OA, provided a eutectic-type phase diagram showing a partial mixing of the two components in OA-rich region. Thermodynamic analysis of the Liquidus Line in the phase diagram exhibits a systematic trend for the non-ideality parameter of mixing with the variation of the chain length difference between OA and saturated fatty acid species.

Mariana C Costa - One of the best experts on this subject based on the ideXlab platform.

  • solid liquid phase equilibrium diagrams of binary mixtures containing fatty acids fatty alcohol compounds and tripalmitin using differential scanning calorimetry
    Fluid Phase Equilibria, 2019
    Co-Authors: Fernanda Paludetto Pelaquim, L P Cardoso, Antonio J A Meirelles, Flavio Cardoso De Matos, Eduardo A C Batista, Mariana C Costa
    Abstract:

    Abstract Fatty acids, fatty alcohol compounds and triacylglycerols (TAGs) present a significant role in industrial applications, mainly in food, cosmetics and pharmaceutical industries. In this study, eight solid-liquid phase diagrams composed by tripalmitin plus fatty acids (capric acid, lauric acid, myristic acid, palmitic acid and stearic acid) and tripalmitin plus fatty alcohol compounds (1-decanol, 1-dodecanol and 1-tetradecanol) were studied using Differential Scanning Calorimetry (DSC) technique, optical microscopy and X-ray analysis. The phase diagrams formed by tripalmitin + fatty acids (myristic acid, palmitic acid and stearic acid), present a eutectic behavior with a solid solution for tripalmitin (1) + myristic acid (4) system, and a monotectic behavior for tripalmitin + (capric acid and lauric acid) whereas the phase diagrams formed by tripalmitin + fatty alcohol compounds present a monotectic behavior and just one of them present a monotectic behavior with a solid solution (1-tetradecanol). The liquid phase was modelled using ideal assumption, 3-suffix Margules and NRTL models, adjusting its parameters. These models described properly the Liquidus Line of the systems studied.

  • Solid-liquid equilibrium of triolein with fatty alcohols
    Brazilian Journal of Chemical Engineering, 2013
    Co-Authors: Guilherme J. Maximo, Mariana C Costa, Antonio J A Meirelles
    Abstract:

    Triacylglycerols and fatty alcohols are used in the formulation of cosmetic, pharmaceutical and food products. Although information about the phase transitions of these compounds and their mixtures is frequently required for design and optimization of processes and product formulation involving these substances, these data are still scarce in the literature. In the present study, the solid-liquid phase diagrams of two binary systems composed of triolein + 1-hexadecanol and triolein + 1-octadecanol were evaluated by differential scanning calorimetry (DSC) and optical microscopy. The experimental data were compared with predicted data by solving the phase equilibrium equations using an algorithm implemented in MATLAB. The liquid-phase activity coefficients were calculated using the Margules equation (two- and three-suffix) and the UNIFAC model (original and modified Dortmund model). The approaches used for calculating system equilibrium allowed an accurate prediction of the Liquidus Line with low deviations from the experimental data.

  • solid liquid equilibrium of tristearin with refined rice bran and palm oils
    Journal of Chemical & Engineering Data, 2010
    Co-Authors: Mariana C Costa, Marlus P Rolemberg, Adenilson Dos O Santos, L P Cardoso, Maria Alvina Krahenbuhl, Antonio J A Meirelles
    Abstract:

    In the present study, phase diagrams of two systems, formed by tristearin (1,3-di(octadecanoyloxy)propan-2yl octadecanoate) with refined rice bran oil or refined palm oil, were obtained by Differential Scanning Calorimetry (DSC) and reported in the literature for the first time. The X-ray diffraction technique was employed to verify the crystallization behavior of the individual components and for the mixture tristearin plus refined palm oil. The UNIFAC model was successfully used to predict the Liquidus Line of these systems, with a root-mean-square deviation between the experimental and calculated melting temperatures below 1.3 %.