Water activity in liquid food systems: A molecular scale interpretation

Maneffa, Andrew J.; Stenner, Richard; Matharu, Avtar S.; Clark, James H.; Matubayasi, Nobuyuki; Shimizu, Seishi

doi:10.1016/j.foodchem.2017.06.046

Cited by 25 publications

(28 citation statements)

References 34 publications

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“…Our goal therefore is to identify the true origin of nonideality and how it compares with the perspective of solubility parameters. Let us start from the following statistical thermodynamic relationship, i.e., the Maclaurin expansion of ln at the infinite dilution of species 2, which can be derived from the Kirkwood-Buff [53] theory [15,81]:…”

Section: Solubility Via the Regular Solution Theory Cannot Be Linkementioning

confidence: 99%

“…(Note that the superscript, , for the solvent species, unless indispensable, will be omitted from this section onwards. See Appendix A of Ref [81] for the derivation of Eq. (9).)…”

Section: Solubility Via the Regular Solution Theory Cannot Be Linkementioning

confidence: 99%

“…Let us start from Eq. (9), which can provide a microscopic interpretation for the well-known empirical formula by Norrish and Margules [81] ln (18) Comparing Eqs. (9) and (18), the Margules-Norrish parameter can be interpreted as [81]…”

Section: The Regular Solution From a Statistical Thermodynamic Perspementioning

confidence: 99%

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Statistical thermodynamics of regular solutions and solubility parameters

Shimizu

Matubayasi

2019

Journal of Molecular Liquids

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Solubility parameters, developed originally for regular solutions, have been applied to solutions beyond the presumed weak non-ideality, implying that the true foundation of the solubility parameters may be more general than the regular solution theory. To assess the root 2 of regularity on rigorous statistical thermodynamics, here we reexamine the classical iodine dissolution experiments by Shinoda and Hildebrand, who concluded that the entropy of mixing is ideal regardless of solute-solvent size ratio. We show that iodine solubility is concerned with the limit of infinite dilution, while the regular solution theory is a scheme to describe the dependence on the solute concentration. This means that the solubility of iodine cannot be a foundation of the regular solution; it is further shown that the differences in the solvation free energy among organic solvents are dominated by enthalpy with negligible role of the entropic component. In addition, the validity of the regular solution concept, i.e., the enthalpic nature of the solution non-ideality, can now be examined quantitatively by expressing the Margules model in terms of the Kirkwood-Buff integrals, which incorporate the excluded volume effects and the potential of mean force nature of interactions that were beyond the reach of the classical thermodynamic models. Such insights into the physical basis of solubility parameters may be useful for improving solubility prediction.

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Section: Solubility Via the Regular Solution Theory Cannot Be Linkementioning

confidence: 99%

“…(Note that the superscript, , for the solvent species, unless indispensable, will be omitted from this section onwards. See Appendix A of Ref [81] for the derivation of Eq. (9).)…”

Section: Solubility Via the Regular Solution Theory Cannot Be Linkementioning

confidence: 99%

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Statistical thermodynamics of regular solutions and solubility parameters

Shimizu

Matubayasi

2019

Journal of Molecular Liquids

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“…É de conhecimento geral que a água é um fator imprescindível para a existência da vida. Nesse sentido, o conteúdo de água presente em um produto farmacêutico está relacionado à presença e à prevalência de microrganismos, sendo determinante para a sua estabilidade durante seu ciclo de vida (UNITED, 2018b;MANEFFA et al, 2017).…”

Section: Crescimento Microbianounclassified

“…Entretanto, em alguns casos, a medida da umidade total pode não representar a real susceptibilidade do produto à contaminação microbiana, uma vez que a água poderá não estar disponível para a utilização pelo microrganismo. Para isso, é necessário que se conheça a quantidade de água livre, a qual se dá o nome de atividade de água (aW) (MANEFFA et al, 2017).…”

Section: Crescimento Microbianounclassified

Abordagem microbiológica e estatística aplicada ao monitoramento ambiental em áreas produtivas farmacêuticas

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Oxidative stability, structural, and textural properties of margarine enriched with Moringa oleifera leaves extract

Ouahrani

Tzompa‐Sosa

Dewettinck

et al. 2022

J Americ Oil Chem Soc

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Consumer's demand for clean label food ingredients has driven the development of alternative food additives. This study falls within this challenge through valorization of Moringa oleifera leaves grown in Algeria as a natural antioxidant. A methanolic M. oleifera leaves extract (MOLE) was prepared and included in margarine at various levels (400, 600, and 800 ppm) and was compared to vitamin E and a margarine without antioxidants. The effect of addition of MOLE on margarine quality was studied by means of its oxidative stability, structural, textural properties, color, and aroma fingerprint. It was shown that addition of MOLE to margarine increased resistance towards oxidation, showing a higher antioxidant capacity as compared to margarine with vitamin E or without antioxidants. Moreover, addition of MOLE decreased water droplet size, which is desirable from a microbiological viewpoint since it could extend margarine's shelf life. Furthermore, addition of MOLE leads to the formation of smaller fat crystals, resulting in different fat network formation, which could be the cause of the increase in hardness seen in these margarines. Regarding sensorial effects, MOLE addition led to a significant darkening of the margarine and increase yellowness. Moreover, the aroma fingerprint showed that addition of MOLE modified the aroma fingerprint of this product.

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Water activity in liquid food systems: A molecular scale interpretation

Cited by 25 publications

References 34 publications

Statistical thermodynamics of regular solutions and solubility parameters

Statistical thermodynamics of regular solutions and solubility parameters

Abordagem microbiológica e estatística aplicada ao monitoramento ambiental em áreas produtivas farmacêuticas

Oxidative stability, structural, and textural properties of margarine enriched with Moringa oleifera leaves extract

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