نتایج جستجو برای: liquid phase micro extraction

تعداد نتایج: 1024711  

Journal: :journal of herbal drugs (an international journal on medicinal herbs) 2015
parviz aberoomand azar kambiz larijani narjes kalantari

background & aim: essential oils are isolated from different sections of plants such as flowers, seeds, leaves, stems and roots. essential oils are applied extensively in producing of perfumes, cosmetics, foods, beverages and confectioneries and as ingredients of disinfectants and insecticides. experimental: essential oil are obtained by several isolation methods, such as hydrodistillation ...

Journal: :Molecules 2010
Patricia Garcia-Salas Aranzazu Morales-Soto Antonio Segura-Carretero Alberto Fernández-Gutiérrez

This paper reviews the phenolic-compound-extraction systems used to analyse fruit and vegetable samples over the last 10 years. Phenolic compounds are naturally occurring antioxidants, usually found in fruits and vegetables. Sample preparation for analytical studies is necessary to determine the polyphenolic composition in these matrices. The most widely used extraction system is liquid-liquid ...

Journal: :The Analyst 2015
Jialu Wang Martha Sibrian-Vazquez Jorge O Escobedo Lei Wang Yu-Hsuan Chu Richard G Moore Robert M Strongin

The first solid phase extraction materials for selective lysophosphatidic acid (LPA) enrichment from human plasma are described. Molecularly imprinted polymers were designed, synthesized and evaluated as cartridge fillings. They enabled a relatively rapid and simple extraction protocol for LPA without any need for multiple liquid-liquid extraction steps. The five major subspecies of lysophospha...

2008
R. Knauss

Vapour and liquid phases of a simple batch distillation may be separated theoretically at equilibrium at a certain pressure and temperature state. A small separation effect can be achieved by this, because only one equilibrium stage between liquid and vapour phase is thereby realised. Contacting again vapour and liquid flows leaving one single stage in co-current mode, no further separation eff...

Journal: :Applied sciences 2021

A key step in the process of isolating microbial natural products is preparation an extract from a culture. This determines which molecules will be available for detection subsequent chemical and biological analysis biodiscovery pipeline. In present study we wanted to document potential differences performance between liquid–liquid extraction using ethyl acetate liquid–solid poly-benzyl-resin. ...

2014
ALIREZA ASGHARI MEHRI GHAZAGHI MARYAM RAJABI MAHDI BEHZAD MEHRORANG GHAEDI

Ionic liquid-based dispersive liquid–liquid microextraction (IL– –DLLME) coupled with high performance liquid chromatography (HPLC) with UV detection was developed for the simultaneous extraction and determination of nickel, cobalt, copper and zinc ions. In the proposed approach, salophen (N,N'-bis(salicylidene)-1,2-phenylenediamine) was used as a chelating agent, the ionic liquid, 1-hexyl-3-me...

Journal: :Journal of chromatographic science 2002
Carl T Whalen Glenn D Hanson Kathy J Putzer Michael D Mayer Darcy J Mulford

In this study, a sensitive, specific assay for the determination of TNP-470 and its two major metabolites M-IV (also know as AGM-1883) and M-II in human plasma is reported. The assay involves liquid-liquid extraction of acidified plasma followed by reversed-phase high-performance liquid chromatography-atmospheric pressure chemical ionization-tandem mass spectrometry. A liquid-liquid extraction ...

Journal: :iranian journal of pharmaceutical research 0
parvin parsaei department of chemistry, islamic azad university, north tehran branch, tehran, iran manouchehr bahmaei department of chemistry, islamic azad university, north tehran branch, tehran, iran. alireza ghannadi school of pharmacy and pharmaceutical sciences and isfahan pharmaceutical research center, isfahan university of medical sciences, isfahan, iran.

dispersive liquid-liquid microextraction method (dllme) combined with high-performance liquid chromatography-ultraviolet detection (hplc-uv) was used to determine thiamine (b1), nicotinamide (b3) and pyridoxine (b6) in sour cherry juice. this method was rapid, simple and sensitive. separation was accomplished using a c18 column. the optimum chromatographic conditions were found to be: mobile ph...

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