Determination of nano-molar levels of formaldehyde in drinking water using flow-injection system with immobilized formaldehyde dehydrogenase after off-line solid-phase extraction

Kiba, Nobutoshi; Sun, Limin; Yokose, Shinya; Kazue, Masaki Tachibana; Suzuki, Tani Takashi

doi:10.1016/s0003-2670(98)00636-9

Cited by 35 publications

(20 citation statements)

References 20 publications

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“…It has been used for formaldehyde detection and many efforts have been dedicated to the immobilization of FalDH in order to improve its stability. 8 Among the commonly employed supports are: nafion, [9][10][11][12] chitosan, 10 CdS, 13 dextran, 14 glass beads, 15 polymer beads, 16,17 silica, 18,19 and sepharose. 20 Our focus was concentrated on the performance of FalDH associated with superparamagnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Association of Pseudomonas putida formaldehyde dehydrogenase with superparamagnetic nanoparticles: an effective way of improving the enzyme stability, performance and recycling

2015

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The association of formaldehyde dehydrogenase from Pseudomonas putida (FalDH) with two different magnetic nanoparticles led to distinct enzyme responses depending upon the chemical modification process applied. The magnetite nanoparticles coated with aminopropyltriethoxysilane (MagNP-APTS) exhibited a lower activity and stability, while magnetite coated with a silica shell and APTS (MagNP@SiO 2 APTS) afforded excellent results, improving the stability and performance of FalDH in relation to the free enzyme. Such differences were ascribed to unfavorable conformational changes in the MagNP-APTS-FalDH system, as indicated by the kinetics and Raman spectroscopy data, not discarding the possible interference from the exposed Fe(II)/(III) ions. The MagNP@SiO 2 APTS-FalDH catalyst could be successfully recycled by using an external magnet, keeping its highest performance close to 100%, during the first four cycles, and decaying slightly up to 70% after the 10th cycle.

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Section: Introductionmentioning

confidence: 99%

Association of Pseudomonas putida formaldehyde dehydrogenase with superparamagnetic nanoparticles: an effective way of improving the enzyme stability, performance and recycling

2015

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“…In the determination of trace amounts of formaldehyde in water, in general, some enrichment procedures are always used for the preconcentration of formaldehyde before measurement [39][40][41]. Therefore, a simple and highly sensitive method for formaldehyde determination is required for the direct analysis of water samples without any preconcentration techniques.…”

Section: Introductionmentioning

confidence: 99%

Development of novel detection reagent for simple and sensitive determination of trace amounts of formaldehyde and its application to flow injection spectrophotometric analysis

Li¹,

Sritharathikhum²,

Oshima³

et al. 2008

Analytica Chimica Acta

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“…3 Also, it has known irritant properties such as eye irritation, respiration irritation and pulmonary edema. 4 Several flow injection spectrophotometric methods have been reported for the determination of formaldehyde [5][6][7][8][9][10][11] using different chemical agents. The disadvantages of these methods are high limits of determination and short linear dynamic ranges 6-10 (> 50 ng ml -1 ), low color stability, 7,8 and they suffer interference from many substances.…”

Section: Introductionmentioning

confidence: 99%

Flow Injection Determination of Formaldehyde by Its Catalytic Effect on the Oxidation of Sulfonazo III by Bromate with Spectrophotometric Detection

Ensafi

Honarmand

2005

ANAL. SCI.

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It is well-known that low molecular-weight aldehydes, such as formaldehyde, are environmentally hazardous substances. Formaldehyde enters the environment from natural sources and from direct human sources such as fuel combustion, industrial on-site uses and off gassing from building materials and consumer products. Formaldehyde enters drinking water as a result of human activities; the major sources are the discharge of industrial wastes and oxidative water treatment processes, such as ozonation and chlorination. 1,2 This compounds uniquely important because of its widespread use and toxicity and it is recognized as one of most important pollutants. 3 Also, it has known irritant properties such as eye irritation, respiration irritation and pulmonary edema. 4 Several flow injection spectrophotometric methods have been reported for the determination of formaldehyde 5-11 using different chemical agents. The disadvantages of these methods are high limits of determination and short linear dynamic ranges 6-10 (> 50 ng ml -1 ), low color stability, 7,8 and they suffer interference from many substances.6-9 All of the above methods are simple but are not sensitive enough and are subject to interferences from other organic compounds. Recently, Zhang et al. 11 have reported a flow injection spectrophotometric method for determination of formaldehyde, but the limit of detection is higher (18 ng ml -1 ) than the proposed method and the method has short dynamic range. The other sensitive flow injection method is based on chemiluminescence 12 and spectrofluorometric 13 determination of formaldehyde. The chemiluminescence method is highly sensitive, but suffers many interfering substances, whereas the spectrofluorometric method has short linear dynamic range (1 -56 µg ml -1 ) for the determination of formaldehyde.The aim of this paper was the development of a selective and safe method for the determination of formaldehyde at trace levels. The method was based on the catalytic effect of formaldehyde on the oxidation of sulfonazo III by bromate in acidic media, and analysis by flow injection and spectrophotometric detection at 566 nm. The method allows rapid determination of formaldehyde at low operating costs and shows simplicity, adequate selectivity, and low limit of detection with a very good precision. Experimental Reagents and chemicalsAll the dilutions of standard solutions and reagent solutions were prepared using redistilled water and stored in glass bottles with screw-cap.A 2.64-ml volume of formaldehyde (35%, Sigma) was dissolved into water in a 1000-ml volumetric flask to prepare 1.0 mg ml -1 formaldehyde solution. The solution was standardized by sulfite using a titrimetry method. 14 Working solution was prepared daily by appropriate dilution of the stock solution with water. A 1.45 × 10 -4 sulfonazo III solution was prepared by dissolving 0.010 g of the reagent (Merck) in water in a 100-ml volumetric flask. A 1.0 M bromate solution was prepared by dissolving 15.090 g NaBrO3 (Fluka) in 100 ml water in a 100-ml volum...

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Determination of nano-molar levels of formaldehyde in drinking water using flow-injection system with immobilized formaldehyde dehydrogenase after off-line solid-phase extraction

Cited by 35 publications

References 20 publications

Association of Pseudomonas putida formaldehyde dehydrogenase with superparamagnetic nanoparticles: an effective way of improving the enzyme stability, performance and recycling

Association of Pseudomonas putida formaldehyde dehydrogenase with superparamagnetic nanoparticles: an effective way of improving the enzyme stability, performance and recycling

Development of novel detection reagent for simple and sensitive determination of trace amounts of formaldehyde and its application to flow injection spectrophotometric analysis

Flow Injection Determination of Formaldehyde by Its Catalytic Effect on the Oxidation of Sulfonazo III by Bromate with Spectrophotometric Detection

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