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Tuesday, July 28, 2020 | History

2 edition of Membrane-based methods for the preconcentration of biomolecules found in the catalog.

Membrane-based methods for the preconcentration of biomolecules

Robert Bien

Membrane-based methods for the preconcentration of biomolecules

by Robert Bien

  • 31 Want to read
  • 12 Currently reading

Published .
Written in English

    Subjects:
  • Biomolecules -- Separation,
  • Separation (Technology),
  • Chemistry

  • Edition Notes

    Statementby Robert Bien
    The Physical Object
    Paginationv, 68 leaves :
    Number of Pages68
    ID Numbers
    Open LibraryOL14971809M

      Recently, the Crooks group proposed an even simpler preconcentration method termed “faradaic ICP” using bipolar electrode (BPE) [35–45]. In contrast to the traditional ICP, this method harnesses faradaic reaction on the surface of the BPE to form an extended, enhanced electric field gradient for biomolecular preconcentration. Membrane based preconcentration method has an advantage in analytical applications wherein direct quantification of preconcentrated species in the membrane is possible either by methods .

      The nanochannels were fabricated by the substrate-bonding method, and the regularity of the nanochannel has been confirmed by cross-section SEM imaging. A nanofilter array device, with an array of nm thin nanofilters, was used for separating small biomolecules (short double-stranded DNA and SDS-coated proteins) based on their size.   The main objective of this chapter is to review the on-chip molecular sample preparation methods. For an on-chip sample preparation for large biological objects, such as cells and particles, prior to the molecular sample preparation, there are several methods available such as dielectrophoresis, hydrophoretic filtration, and separation via magnetic .

      Fluorescently labeled proteins were electrophoretically concentrated on microfabricated devices prior to separation and laser-induced fluorescence detection on the same device. The proteins were concentrated using a porous silica membrane between adjacent microchannels that allowed the passage of buffer ions but excluded larger migrating molecules.   The separation and sensitive detection methods are the core of the field in proteomics, genomics and modern biology. The detection of biomolecules such as amino acids, peptides, proteins, nucleic acids and related substances in biological samples (blood, urine, tissues, cells and microorganisms) is collectively known as bioanalysis.


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Membrane-based methods for the preconcentration of biomolecules by Robert Bien Download PDF EPUB FB2

Using the system, preconcentration was performed in continuous mode and was based on a membraneless evaporation process under diminished pressure. The parameters of the proposed system were optimized and the system was tested on the example of the spectrophotometric determination of Cr (III).Cited by: 1.

Membrane-based techniques for the separation and purification of proteins: An overview HPTFF is a two-dimensional purification method that exploits differences in both size and charge characteristics of protein/biomolecules. Thus this methodology can be used to separate protein with same molecular by: In this study, a simple, rapid and effective in-syringe micro-solid phase extraction (MSPE) method was developed for the separation and preconcetration of parabens (methyl, ethyl, propyl and butyl paraben) in environmental water samples.

The parabens were determined and quantified using high performance liquid chromatography and a photo diode array detector (HPLC-PDA).Cited by: 6.

Recently, many papers have reported on enhancing preconcentration of biomolecules and reducing operation time in micro/nanofluidic devices. Such preconcentration methods include solid-phase extraction, temperature gradient focusing, and isotachophoresis (ITP).Cited by: 7. The proposed LFA consists of a backing pad incorporated with a nitrocellulose (NC) membrane and a detachable magnet for preconcentration of target biomolecules.

The sample containing the target analyte is added to a vial containing the target specific antibody-conjugated magnetic by: 6. Recently, novel biomolecules separation and detection methods based on ion concentration polarization (ICP) phenomena have been extensively developed [ 2 – 6 ].

The ICP phenomena that is generated near the interface of a microfluidic channel and perm-selective nanojunction causes the depletion zone at the anodic side of the membrane. Membrane-based sample preparation techniques are an attractive tool for the extraction of a wide range of compounds in complex and ‘dirty’ matrices, such as biological and food samples.

Among the compounds determined using membrane-based techniques are drugs, metabolites, alkaloids, pollutants and metals. Since conventional ICP preconcentration method has several benefits such as high preconcentration factor and no need of complex buffer exchange, ICP has been extensively studied for the selective preconcentration of biomolecules [8,9,10,11,12].

However, because typical ICP platform required an external electrical field for performing the. The gold abundance in basic rocks, which normally varies between and 5 ppb, has served as a very important indicator in many geoscience studies, including those focused on the planetary differentiation, redistribution of elements during the crustal process, and ore genesis.

However, because gold is a monoisotopic element that exhibits a nugget effect, it is very difficult to. In this work, we present a fast, reliable, and robust method for the extraction, preconcentration, and determination of four selected alkaloids with an indole skeleton, i.e., harmine, harmaline, yohimbine, and ajmalicine, by ultra-high performance liquid chromatography coupled with tandem mass spectrometry.

In this work, bamboo charcoal was used as solid-phase extraction adsorbent for the enrichment of six perfluoroalkyl acids (PFAAs) in environmental water samples before liquid chromatography–tandem mass spectrometry analysis.

The specific porous structure, high specific surface area, high porosity, and stability of bamboo charcoal were characterized. Several. In contrast, membrane-based preconcentration methods are generally faster than with nanogaps, and the fabrication methods have a range of complexity.

Some materials used to fabricate these membranes are polycarbonate (PC), track-etched PC [32, 36], titania, nafion, and silica gel. In this paper, we present a method combining surface-enhanced Raman scattering (SERS) spectroscopy to detect biomolecules in a label-free way with an electrokinetic preconcentration technique (electrophoresis) to amplify biomolecular signals at low concentrations.A constant electric field is applied to charged biomolecules in solution, attracting them to an oppositely.

Magnetic Field Assisted Preconcentration of Biomolecules for Lateral Flow Assaying. from simple method to membrane-based methods, pretreatment by magnetic methods to device-integrated sample.

Operation of the nanofluidic molecular concentrator. While there have been several types of nanofluidic concentrator developed during the past couple of years, 3, 19, 20 the basic mechanisms employed in these systems are identical.

There are two common design variations, a single-gated and dual-gated system either with one or two nanojunctions to the neighboring. the preferred options for membrane based filtration approach. At low cost, an impressive range of membrane features are available with thicknesses ranging from 5 to 50 μm, pores sizes from.

This chapter reviews the state-of-art of microfluidic devices for molecular bioanalysis with a focus on the key functionalities that have to be successfully integrated, such as preconcentration, separation, signal amplification, and detection. The first part focuses on both passive and electrophoretic separation/sorting methods, whereas the second part is devoted to.

Preconcentration of large volumes of material is time-consuming, expensive and cumbersome. Faster methods, with the possibility of automation, are also needed for monitoring bioreactors and qualifying products, such as hybridoma cultures, before starting the separation processes.

A highly efficient preconcentration route for rapid and sensitive detection of endotoxin based on an electrochemical biosensor Compared to the traditional static incubation methods, impedance biosensor provides a new strategy for the design of an aptasensor to realize the rapid detection of target biomolecules with high sensitivity and.

Although the method is quite robust, simple, cheap, and yields a high preconcentration factor, a major hurdle to be addressed is extracting the preconcentrated samples without dispersing the. Standard methods such as liquid–liquid extraction (LLE) are regularly used. Alternatively, liquid phase micro-extraction (LPME) appears to be an environmentally friendly tool for sample treatment that offers higher pre-concentration factors.The sample preconcentration methods which incorporates sample cleanup, sample concentration, mixing and reaction before analysis, in microchips are explained.

charged biomolecules between.Ion concentration polarization (ICP) has been widely studied for collecting target analytes as it is a powerful preconcentrator method employed for charged molecules. Although the method is quite robust, simple, cheap, and yields a high preconcentration factor, a major hurdle to be addressed is extracting the preconcentrated samples without dispersing the plug.