Silver Ion Chromatography of Fatty Acids

Momchilova, Svetlana; Nikolova‐Damyanova, Boryana

doi:10.1007/978-94-007-7864-1_75-1

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…These complexes are of the charge-transfer type, i.e., the acid acts as an electron donor and the silver ion as an electron acceptor. The interaction exists between the occupied 2pπ orbitals of a double bond of the acid and the unoccupied 5s and 5p orbitals of the silver ion, and a probably weaker interaction between the occupied 4d orbitals of the silver ion and the free antibonding 2pπ* orbitals of the olefinic bond occurs. − Consequently, the maximum adsorption of oleic acid was observed on the R-Ag + resin. For example, the maximum adsorption of oleic acid was found to be 233.01, 312.25, and 360.20 g·kg –1 from heptane on Indion 790, Indion 860, and R-Ag + resin, respectively.…”

Section: Resultsmentioning

confidence: 99%

Adsorptive Removal of Unsaturated Fatty Acids Using Ion Exchange Resins

Chavan

Khedkar²,

Satpute

et al. 2020

J. Chem. Eng. Data

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The main aim of the present investigation was to elucidate the efficacy of silver ion chromatography for selective separation of unsaturated (oleic, linoleic, and linolenic) fatty acids on a preparative scale. Accordingly, the present work was predominantly divided into two parts. In the first part, adsorption of oleic acid was carried out using commercially available ion exchange resins and silver-ion-loaded resins (R-Ag+) prepared in the laboratory from nonpolar and polar solvents in a batch mode. The maximum adsorption of oleic acid was found on R-Ag+ (454.55 g·kg–1) compared with other commercially available ion exchange resins from heptane at ambient temperature (303 K). The effect of temperature on the adsorption of oleic acid on R-Ag+ from heptane was investigated at 303, 313, and 323 K. The adsorption of oleic acid was favored at 303 K and decreased with a further increase in temperature. Experimental batch equilibrium data were modeled using the Langmuir and Freundlich isotherms. Further, thermodynamic parameters viz., ΔGads 0, ΔHads 0, and ΔSads 0, were estimated. The negative values of ΔGads 0 and ΔHads 0 show that the adsorption of oleic acid on R-Ag+ was spontaneous and exothermic in nature. Based on the results obtained in the first part, the R-Ag+ resin was subjected to adsorption of fatty acids from industrial fatty acids mixture using heptane as a solvent at 303 K. A multicomponent Freundlich isotherm was used to model experimental batch equilibrium data. Linolenic acid and linoleic acid were preferentially adsorbed over oleic acid with selectivities of 1.40 and 1.16, respectively, from industrial fatty acids mixture.

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Section: Resultsmentioning

confidence: 99%

Adsorptive Removal of Unsaturated Fatty Acids Using Ion Exchange Resins

Chavan

Khedkar²,

Satpute

et al. 2020

J. Chem. Eng. Data

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Progress in Technology of the Chromatographic Columns in HPLC

Moldoveanu¹,

David²

2022

Analytical Liquid Chromatography - New Perspectives

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Chromatographic column is an essential part of a any HPLC separation, and significant progress has been made in developing columns with better performance to provide better separation, a shorter separation time, resilience to a wider pH range of the mobile phase, longer lifetime, use of lower volumes of mobile phase, etc. All these characteristics were achieved by the introduction of novel technologies and improvements of the older ones. These include smaller particle used to fill the column, more homogeneous spherical particles, core-shell particles, monolithic columns, more pure silica as a stationary phase support, use of ethylene bridge silica, a wider variety of active phases, use of mixed mode stationary phases, use of polymers as stationary phase, use of various endcapping techniques, etc. Miniaturization and progress in the instrumentation played an important role for the chromatographic column development. All these aspects are summarized in the present chapter.

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Silver Ion Chromatography of Fatty Acids

Cited by 2 publications

References 18 publications

Adsorptive Removal of Unsaturated Fatty Acids Using Ion Exchange Resins

Adsorptive Removal of Unsaturated Fatty Acids Using Ion Exchange Resins

Progress in Technology of the Chromatographic Columns in HPLC

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