Planar Chromatography

Sherma, Joseph

doi:10.1021/ac7023415

Cited by 43 publications

(22 citation statements)

References 202 publications

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“…Theories, techniques, and applications of planar chromatography have been reported in the literature (Sherma 2002(Sherma , 2004(Sherma , 2006(Sherma , 2008. Traditionally, this technique is based on capillary filling phenomenon to drive a mobile phase through a porous material, such as paper, silica gel, alumina, or cellulose, which serves as stationary phase.…”

Section: List Of Symbolsmentioning

confidence: 99%

Analysis of capillary filling in nanochannels with electroviscous effects

Phan

Yang

Nguyen

2009

Microfluid Nanofluid

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Capillary filling is the key phenomenon in planar chromatography techniques such as paper chromatography and thin layer chromatography. Recent advances in micro/nanotechnologies allow the fabrication of nanoscale structures that can replace the traditional stationary phases such as paper, silica gel, alumina, or cellulose. Thus, understanding capillary filling in a nanochannel helps to advance the development of planar chromatography based on fabricated nanochannels. This paper reports an analysis of the capillary filling process in a nanochannel with consideration of electroviscous effect. In larger scale channels, where the thickness of electrical double layer (EDL) is much smaller than the characteristic length, the formation of the EDL plays an insignificant role in fluid flow. However, in nanochannels, where the EDL thickness is comparable to the characteristic length, its formation contributes to the increase in apparent viscosity of the flow. The results show that the filling process follows the Washburn's equation, where the filled column is proportional to the square root of time, but with a higher apparent viscosity. It is shown that the electroviscous effect is most significant if the ratio between the channel height (h) and the Debye length (j -1 ) reaches an optimum value (i.e. jh & 4). The apparent viscosity is higher with higher zeta potential and lower ion mobility.

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Section: List Of Symbolsmentioning

confidence: 99%

Analysis of capillary filling in nanochannels with electroviscous effects

Phan

Yang

Nguyen

2009

Microfluid Nanofluid

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“…Three bioautographic techniques have been described for the investigation of antimicrobial activity [6][7][8]: agar diffusion, direct bioautographic detection on the TLC plate, agar-overlay. The influence of various parameters in these tests has been evaluated [9].…”

Section: Antifungal and Antibacterial Assaysmentioning

confidence: 99%

Thin-layer chromatography with biological detection in phytochemistry

Marston

2011

Journal of Chromatography A

183

119

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“…HPTLC is also ideally suited for the preliminary screening of plant extracts before HPLC analysis. A recent review gives an in-depth summary of TLC and HPTLC [15] and the subject is amply treated elsewhere in this Special Issue.…”

Section: Historymentioning

confidence: 99%

Natural Product Analysis over the Last Decades

Marston

Hostettmann²

2009

Planta Med

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Progress in natural product chemistry has always been strongly linked to innovations in analytical technology. The characterisation of metabolites in complex mixtures requires sophisticated techniques, which should provide good sensitivity and selectivity as well as structural information on the constituents of interest. This review outlines the most important chromatographic and spectral techniques which have been introduced in the field of natural products. Although there has been a very rapid evolution of methods over the last 50 years, the introduction of highthroughput screening programmes require even more efficient and sensitive methodologies which yield adequate on-line information for metabolite structure determinatio

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Planar Chromatography

Cited by 43 publications

References 202 publications

Analysis of capillary filling in nanochannels with electroviscous effects

Analysis of capillary filling in nanochannels with electroviscous effects

Thin-layer chromatography with biological detection in phytochemistry

Natural Product Analysis over the Last Decades

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