Mobile phases and their properties

Moldoveanu, Serban C.; David, Víctor

doi:10.1016/b978-0-323-91177-1.00002-8

Cited by 3 publications

(2 citation statements)

References 105 publications

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“…It is determined by dissolving the compound in a biphasic system consisting of lipids and water, which do not mix, allowing us to ascertain the proportion of the solute dissolved in each of the two phases. It is possible to compute it using computer applications in cases where the experimental value is unavailable, such as with software like MarvinSketch 5.4.0.1 or EPI Suite [24]. A higher value of LogP means that the compound has lipophilic nature and vice versa.…”

Section: Extraction Of Coumarin Mixture Using Binary Solventsmentioning

confidence: 99%

Extraction of Coumarin Mixture from Tamanu Oil using Food-Grade

Safrina Hapsari,

Hakun Wirawasista Aparamarta,

Nurul Jadid

et al. 2024

ARFMTS

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Indonesia’s flora and fauna are divided into four significant ecosystems: freshwater (rivers and lakes), marine, semi-terrestrial (mangrove and riparian), and terrestrial. Tamanu (Calophyllum inophyllum) is a member of the mangrove-associated plant species belonging to the mangosteen family. It is also known as Alexandrian laurel, bintangur (Malaysia), Borneo-mahogany, polanga (India), and nyamplung (Indonesia). The tamanu seed can produce oil with a 60-75% yield. It is applicable to treat various skin problems, including eczema, psoriasis, herpes, acne, haemorrhoids, and certain allergies. It is also beneficial as an antimicrobial, anticancer, anti-HIV, anti-inflammation, and anticoagulant agent. This is because tamanu oil contains bioactive compounds named coumarin. Previous works isolated coumarins with toxic solvents and using methods that are hard to scale up. Therefore, this study aims to know the best concentration of food-grade ethanol, the number of stages, and the solvent system to extract crude coumarin mixtures from tamanu oil by batchwise solvent extraction. The free fatty acid and triglyceride removal was also studied. The initial contents of free fatty acid, coumarin mixture, and triglyceride in tamanu oil were 25.87%, 11.96%, and 51.16%, respectively. Tamanu oil was extracted simultaneously with binary solvents (n-hexane and 70%/80%/90% aqueous food-grade ethanol) and a single solvent (96% food-grade ethanol). Each fraction was analysed by Thin Layer Chromatography (TLC) and High Temperature-Gas Chromatography (HT-GC). The best result was obtained using 80% aqueous food-grade ethanol, eight extraction stages, and a binary solvent system, which produced 48.64±6.57% purity and 88.68±1.38% recovery of coumarin mixture. Moreover, it was found that the method removed 64.15% of free fatty acid and 99.96% of triglyceride from the crude tamanu oil after eight stages of batchwise extraction.

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Section: Extraction Of Coumarin Mixture Using Binary Solventsmentioning

confidence: 99%

Extraction of Coumarin Mixture from Tamanu Oil using Food-Grade

Safrina Hapsari,

Hakun Wirawasista Aparamarta,

Nurul Jadid

et al. 2024

ARFMTS

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“…The ZP analysis was executed with a controlled temperature of 25 °C, a refractive index, as suggested by Abbate et al (1978) [45] defined as 1.318 for a 1550 nm wavelength, a viscosity established as 0.0091 poise, and a dielectric constant ε defined as 78.4 [46]. Moreover, for soil samples, the refractive index (RI) must be defined for ZP estimation.…”

Section: Zeta Potential Of Soilsmentioning

confidence: 99%

Electrokinetic Forces as an Electrical Measure of Chemical Aging Potential in Granular Materials

Castilla-Barbosa,

Rincón-Arango,

Ocampo-Terreros

2023

ChemEngineering

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The zeta potential of soils is an electric potential in the double-layer interface and is a physical property exhibited by any particle related to electrochemical attractive forces. On the other hand, the chemical aging phenomenon is seen as the chief mechanism of the aging of sands due to the dissolution and precipitation of minerals, resulting in the development of the cementation of particles in granular mediums. The present investigation focuses on determining whether granular materials can generate cementation due to electrokinetic forces, and if the zeta potential could be related as a measure of the potential of chemical aging. X-ray fluorescence and diffraction tests were performed to characterize four representative fractions of one kind of sand, and zeta potential studies were carried out to determine the electrical potential on the mineral surfaces of each one. Zeta potential analysis showed both dependence on the mineralogical content and the variation in the pH of the colloidal solution fluid because the increase in OH- ion concentrations increases the thickness of the diffuse double layer and the electrokinetic forces of attraction. Moreover, the zeta potential showed an increase in the thickness of the diffuse double layer, due to the electrokinetic forces, which can be associated with the development of cohesive forces with a dependence on the mineralogy of sands.

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Applications and retention properties of alternative organic mobile phase modifiers in reversed-phase liquid chromatography

Atapattu

2024

Journal of Chromatography Open

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Mobile phases and their properties

Cited by 3 publications

References 105 publications

Extraction of Coumarin Mixture from Tamanu Oil using Food-Grade

Extraction of Coumarin Mixture from Tamanu Oil using Food-Grade

Electrokinetic Forces as an Electrical Measure of Chemical Aging Potential in Granular Materials

Applications and retention properties of alternative organic mobile phase modifiers in reversed-phase liquid chromatography

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