Surface characterization of okra hydrocolloid extract by inverse gas chromatography (IGC)

Maria Dimopoulou; Christos Ritzoulis; Costas Panayiotou

doi:10.1016/j.colsurfa.2014.09.042

Surface characterization of okra hydrocolloid extract by inverse gas chromatography (IGC)

Maria Dimopoulou, Christos Ritzoulis, Costas Panayiotou

Aristotle University of Thessaloniki

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

An extensive surface characterization of okra hydrocolloid extract was conducted by means of inverse gas chromatography (IGC) at infinite dilution in three temperatures (40, 50, 60°C). The specific retention volume of 14 solvents, used as probes, was utilized for the assessment of the surface energy, the free energy of adsorption, as well as the relevant enthalpy and entropic component. The contribution to the surface energy of okra extract decreases with increasing temperature. Furthermore, surface characterization demonstrated that the okra extract matrix is Lewis amphoteric with predominantly basic character, as confirmed by the acidity and basicity constants K_A and K_B, respectively. The above were discussed in conjunction with X-ray diffractometry (XRD), size exclusion chromatography (SEC-MALLS/UV), and Fourier transform infra-red spectroscopy (FTIR) data.

Original language	English
Pages (from-to)	37-43
Number of pages	7
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	475
Issue number	1
DOIs	https://doi.org/10.1016/j.colsurfa.2014.09.042
Publication status	Published - 20 Jun 2015
Externally published	Yes

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title = "Surface characterization of okra hydrocolloid extract by inverse gas chromatography (IGC)",

abstract = "An extensive surface characterization of okra hydrocolloid extract was conducted by means of inverse gas chromatography (IGC) at infinite dilution in three temperatures (40, 50, 60°C). The specific retention volume of 14 solvents, used as probes, was utilized for the assessment of the surface energy, the free energy of adsorption, as well as the relevant enthalpy and entropic component. The contribution to the surface energy of okra extract decreases with increasing temperature. Furthermore, surface characterization demonstrated that the okra extract matrix is Lewis amphoteric with predominantly basic character, as confirmed by the acidity and basicity constants KA and KB, respectively. The above were discussed in conjunction with X-ray diffractometry (XRD), size exclusion chromatography (SEC-MALLS/UV), and Fourier transform infra-red spectroscopy (FTIR) data.",

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AU - Dimopoulou, Maria

AU - Ritzoulis, Christos

AU - Panayiotou, Costas

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AB - An extensive surface characterization of okra hydrocolloid extract was conducted by means of inverse gas chromatography (IGC) at infinite dilution in three temperatures (40, 50, 60°C). The specific retention volume of 14 solvents, used as probes, was utilized for the assessment of the surface energy, the free energy of adsorption, as well as the relevant enthalpy and entropic component. The contribution to the surface energy of okra extract decreases with increasing temperature. Furthermore, surface characterization demonstrated that the okra extract matrix is Lewis amphoteric with predominantly basic character, as confirmed by the acidity and basicity constants KA and KB, respectively. The above were discussed in conjunction with X-ray diffractometry (XRD), size exclusion chromatography (SEC-MALLS/UV), and Fourier transform infra-red spectroscopy (FTIR) data.

KW - Hydrocolloid

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KW - Okra

KW - Surface characterization

KW - Thermodynamic properties

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Surface characterization of okra hydrocolloid extract by inverse gas chromatography (IGC)

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