Glyoxal sample preparation for high-performance liquid chromatographic detection of 2,4-dinitro-phenylhydrazone derivative: Suppression of polymerization and mono-derivative formation by using methanol medium

Nakajima, K.; Ohta, Kyuji; Mostefaoui, Toufik A.; Chai, Wen; Utsukihara, Takamitsu; Horiuchi, C. Akira; Murakami, Masahiko

doi:10.1016/j.chroma.2007.06.057

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…The increased weight of the CG beads was attributed to the excess glyoxal, which can undergo a number of reactions within the beads. Glyoxal is known to undergo oligomerisation upon loss of water and it can easily polymerise in the solid state (Loeffler et al, 2006;Nakajima et al, 2007). In addition, it is possible that glyoxal could react with the guanidine group of the DCD to form Schiff base glyoxal-DCD adducts (Panicucci and McClelland, 1989).…”

Section: Resultsmentioning

confidence: 99%

Slow delivery of a nitrification inhibitor (dicyandiamide) to soil using a biodegradable hydrogel of chitosan

et al. 2013

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h i g h l i g h t sDicyandiamide (DCD) was encapsulated in glyoxal-crosslinked chitosan hydrogel beads. Chitosan delayed the release of nitrification inhibitor DCD in water and soil. DCD release was controlled by glyoxal polymerisation inside chitosan. The higher glyoxal polymerisation the more delayed DCD release in water or in soil. The higher glyoxal polymerisation the less DCD encapsulated in the beads. a r t i c l e i n f o b s t r a c tUsing chemical inhibitors to reduce soil nitrification decreases emissions of environmental damaging nitrate and nitrous oxide and improves nitrogen use efficiency in agricultural systems. The efficacy of nitrification inhibitors such as dicyandiamide (DCD) is limited in soil due to biodegradation. This study investigated if the persistence of DCD could be sustained in soil by slow release from a chitosan hydrogel. DCD was encapsulated in glyoxal-crosslinked chitosan beads where excess glyoxal was (i) partly removed (C beads) or (ii) allowed to dry (CG beads). The beads were tested in water and in soil. The beads contained two fractions of DCD: one which was quickly released in water, and one which was not. A large DCD fraction within C beads was readily available: 84% of total DCD bead content was released after 9 h immersion in water, while between 74% and 98% was released after 7 d in soil under low to high moisture conditions. A lower percentage of encapsulated DCD was readily released from CG beads: 19% after 9 h in water, and 33% after 7 d in soil under high rainfall conditions. Kinetic analysis indicated that the release in water occurred by quasi-Fickian diffusion. The results also suggest that DCD release was controlled by bead erosion and the leaching of glyoxal derivatives, predominantly a glyoxal-DCD adduct whose release was positively correlated with that of DCD (R 2 = 0.99, p 6 0.0001). Therefore, novel chitosan/glyoxal composite beads show a promising slow-release potential in soil for agrochemicals like DCD.

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Section: Resultsmentioning

confidence: 99%

Slow delivery of a nitrification inhibitor (dicyandiamide) to soil using a biodegradable hydrogel of chitosan

et al. 2013

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“…It is noted that even if the in situ derivatisation improves the collection efficiency of carbonyl compounds, care must be taken for those compounds that do not derivatise well with DNPH. Glyoxal reacts slowly with DNPH [78] and can also polymerise in any sample apparatus once it is collected from the gas-phase [78]. A relatively small equilibrium constant for the DNPH derivatisation reaction was also reported from hydroxyacetone [79].…”

Section: Sampling Conditionsmentioning

confidence: 98%

Denuder sampling techniques for the determination of gas-phase carbonyl compounds: A comparison and characterisation of in situ and ex situ derivatisation methods

Kahnt

Iinuma

Böge

et al. 2011

Journal of Chromatography B

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“…The rapid reaction of glyoxal with proteins may account for the difficulty in its measurement in biological samples [22] . However, there are reports on significant increases of plasma glyoxal concentrations in uremic [23] and diabetic patients [24] .…”

Section: Methodsmentioning

confidence: 99%

Level of alpha dicarbonyl compound (methylglyoxal, diacetyl and glyoxal) in a sample of Iraqi patient with type 2 diabetic retinopathy

Hamid¹,

Al-Wasiti²,

Al-Karawi³

2021

ASRO

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Diabetes mellitus is a common endocrine and metabolic diseases leading to impaired metabolism of carbohydrate, lipid, and protein. Hyperglycemiacoused by complete or relative insulin deficiency, insulin defective secretion and incorrect action. Diabetic retinopathy is characterized by microvascular lesions such as impaired blood flow regulation, increased vasopermeability, capillary basement membrane thickening, microaneurysm formation, capillary dropout, and eventually widespread nonperfusion and ischemia . Dicarbonyl stress is a dysfunctional state where methylglyoxal (MGO) and other reactive alpha-oxaldehyde metabolites accumulate as consequence of their increased formation or decreased activity of the detoxifying systems. In diabetic patients, MGO and MGO-related advanced end products (AGEs) are responsible for many diabetes-related complications.

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Glyoxal sample preparation for high-performance liquid chromatographic detection of 2,4-dinitro-phenylhydrazone derivative: Suppression of polymerization and mono-derivative formation by using methanol medium

Cited by 11 publications

References 15 publications

Slow delivery of a nitrification inhibitor (dicyandiamide) to soil using a biodegradable hydrogel of chitosan

Slow delivery of a nitrification inhibitor (dicyandiamide) to soil using a biodegradable hydrogel of chitosan

Denuder sampling techniques for the determination of gas-phase carbonyl compounds: A comparison and characterisation of in situ and ex situ derivatisation methods

Level of alpha dicarbonyl compound (methylglyoxal, diacetyl and glyoxal) in a sample of Iraqi patient with type 2 diabetic retinopathy

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