Chemiluminescence microfluidic system on a chip to determine vitamin B1 using platinum nanoparticles triggered luminol–AgNO3 reaction

Kamruzzaman, Mohammad; Alam, Al-Mahmnur; Lee, Sang Hak; Dang, Trung Thanh

doi:10.1016/j.snb.2013.04.029

Cited by 24 publications

(15 citation statements)

References 38 publications

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“…Inclusion of FD into our study allowed us to disentangle how different magnitudes of hydrological change impact different peatland types. Deep drainage associated with peatland forestry has previously been used as a proxy for climate change (Laiho, 2006;Laine et al, 1996;Nykänen, Alm, Silvola, Tolonen, & Martikainen, 1998), which may be problematic. Predicted climate changes (IPCC, 2014) are likely insufficient to decrease WTs to the extent done in forestry drainage, which causes changes to canopy and ground vegetation in boreal peatlands (Laine et al, 1995;Minkkinen et al, 1999;Päivänen, 1974).…”

Section: Wld In Comparison To Fdmentioning

confidence: 99%

Responses of peatland vegetation to 15‐year water level drawdown as mediated by fertility level

Kokkonen

Laine

et al. 2019

J Vegetation Science

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Questions Peatland ecosystems are a globally important carbon storage that is predicted to turn into a carbon source due to water level drawdown (WLD) associated with climate change. The predictions assume stable plant communities but how realistic is this assumption? If the vegetation is not stable, what are the nature and rate of changes? Location Peatland complex in Southern Finland. Methods We conducted a water level drawdown (WLD of ~10 cm) experiment over 17 years in three peatland types differing in their fertility. On each peatland type, we included an adjacent forestry drained (FD, with water table ca. 40 cm lower than in control) area for comparison. Results Peatland type had a clear impact on the response to WLD: at the ecosystem level, the two minerotrophic fens underwent rapid species turnover, while the vegetation in nutrient‐poor bog was more resilient to change. In nutrient‐rich sites, WLD initiated tree canopy development and created understorey conditions that strengthened impact of WLD. In nutrient‐poor site, tree establishment was seen only in the FD area. In addition to high nutrient level, high wetness accelerated change at the plant community level, where we found three types of responses: accelerating change, decelerating change, and stability. Succession resulted in an overall loss of community heterogeneity. Conclusions Interaction between hydrology, nutrient availability, and biological factors in boreal peatlands is important: the drop in water table required to achieve the shift from open peatland to forested system is inversely proportional to the nutrient level of the system. The results suggest that predictive models of peatland functions under climate change should consider compositional change for fens and their diverse plant communities but are more realistic for bogs. The response of bog vegetation to climate change may, however, be more dependent on changes in rainfall regime and therefore needs to be further addressed.

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Section: Wld In Comparison To Fdmentioning

confidence: 99%

Responses of peatland vegetation to 15‐year water level drawdown as mediated by fertility level

Kokkonen

Laine

et al. 2019

J Vegetation Science

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“…Kamruzzaman et al developed a sensitive chemiluminescence (CL) method on a microchip for determination of vitamin B1 (VB1). The microchip was fabricated by a soft lithographic procedure using PDMS having four inlets and one outlet with a 200 μm wide, 250 μm height, 6 mm diameter, and 100 mm‐long microchannel.…”

Section: Recent Applications Of Mce In Clinical Analysismentioning

confidence: 99%

Recent advances in miniaturization—The role of microchip electrophoresis in clinical analysis

Guihen

2013

Electrophoresis

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This review is a follow-up from the last review published in 2012 that covers the same topic [22]. Its aim is to cover new innovations and developments since then, involving the role of microchip capillary electrophoresis (MCE) in clinical analysis. MCE has shown great promise in separation science, as it's a state-of-the-art analytical separation technique that offers speed, portability, reduced sample, and reagent requirements, repeatability, can be used online or offline, and can be coupled with many kinds of analytical detectors. It is particularly important in clinical analysis, as it offers online continuous monitoring, can handle small volumes of highly complex biological samples due to its powerful discriminating ability, and it facilitates point-of-care testing. Also microchip separation platforms have been used for sample clean-up, filtration, derivatization, separation and detection, acting as multifunctional platforms ideal for minute sample volumes. In recent times the clinical world has witnessed a need for rapid turnaround times on analysis of very complex samples, and so there has been a shift toward point-of-care testing and other miniaturized analytical techniques as a favorable solution. Research developments in this area have been catalyzed by rapid strides in knowledge in the areas of proteomics, metabolomics, and molecular biology in the quest to understand the physiology of cells, proteins, genes, molecular interactions, and the pathophysiology of disease. Herein, we present selected examples detailing the use of MCE in some of the latest and most exciting clinical applications.

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“…AgNPs were found to catalyze this CL reaction producing intense emission possibly due to the high electron density imparted by the high surface area of the small particles [3,20,21]. Other metal nanoparticles such as AuNPs, Au/Ag alloy NPs and PtNPs also enhance the CL of luminol in presence of various oxidants [20][21][22][23]. However, AgNPs exhibit the highest catalytic activity which has been rationalized by the lower reduction potential of Ag compared to Au and Pt [10].…”

Section: Introductionmentioning

confidence: 99%

Luminol Chemiluminescence Catalyzed by Silver Nanoparticles for the Sensitive Determination of Penicillamine

Suliman

Al-Hadhrami²

2018

SQU Journal for Science

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A sequential injection method for the determination of penicillamine (PA) was developed based on quenching the chemiluminescence generated by oxidation of luminol by hydrogen peroxide in presence of silver nanoparticles (AgNPs). The chemiluminescence (CL) of the reaction was found to greatly enhance in presence of AgNPs due to the increased catalyst surface area. The method was sensitive and found suitable for analysis of penicillamine in pharmaceutical preparations. Linear calibration curve is obtained in the range 0.2-1.0 g mL -1 with a relative standard deviation less than 2%. A recovery percent of 102.3 0.2 was obtained with the tablets matrix indicating reasonable selectivity of the method for PA in tablets. The mechanism of quenching of the CL reaction was investigated by UV-Visible spectroscopy and transmission electron microscopy as well as by theoretical calculations using DFT-B3LYP method. The covalent attachment of PA to the AgNPs triggers aggregation of the particles thereby diminishing the surface significantly. The method was applied for the assay of PA in pharmaceutical preparations. Keywords

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Chemiluminescence microfluidic system on a chip to determine vitamin B1 using platinum nanoparticles triggered luminol–AgNO3 reaction

Cited by 24 publications

References 38 publications

Responses of peatland vegetation to 15‐year water level drawdown as mediated by fertility level

Responses of peatland vegetation to 15‐year water level drawdown as mediated by fertility level

Recent advances in miniaturization—The role of microchip electrophoresis in clinical analysis

Luminol Chemiluminescence Catalyzed by Silver Nanoparticles for the Sensitive Determination of Penicillamine

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