A spectrophotometric method for the micro determination of glycolaldehyde

Basson, R. A.; Plessis, T. A. Du

doi:10.1039/an9679200463

Cited by 6 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, based on the absence of diacetyl at a AgNP synthesis temperature of 150 °C, Xia et al proposed EG oxidizes to GA instead of acetaldehyde, assisting the reduction of Ag + . The formation of in situ GA during AgNP synthesis was quantified using a spectrophotometric method, and based on the observation, GA was concluded as the primary reducing agent of Ag + . , However, the previous in situ quantification method included PVP in the reaction mixture that causes interference during spectrophotometric detection due to the presence of carbonyl groups in PVP (Figure S14). Additionally, their study suggested, AgNPs formed initially during the synthesis catalyze EG oxidation to GA, thus maintaining a GA supply during the synthesis of AgNPs .…”

Section: Resultsmentioning

confidence: 99%

Chemical Identity of Poly(N-vinylpyrrolidone) End Groups Impact Shape Evolution During the Synthesis of Ag Nanostructures

et al. 2020

View full text Add to dashboard Cite

Ag nanocubes (AgNCs) are predominantly synthesized by the polyol method, where the solvent (ethylene glycol) is considered the reducing agent and poly(N-vinylpyrrolidone) (PVP) the shape-directing agent. An experimental phase diagram for the formation of Ag nanocubes as a function of PVP monomer concentration (C m ) and molecular weight (M w ) demonstrated end groups of PVP impact the final Ag product. Measured rates of the initial Ag + reduction at different PVP C m and M w confirmed the reducing effect originates from end-groups. PVP with welldefined aldehyde and hydroxyl end groups lead to the formation of Ag nanocubes and nanowires respectively, indicating the faster reducing agent formed kinetically preferred nanowires. We demonstrate PVP end-groups induce initial reduction of Ag + to form seeds followed by autocatalytic reduction of Ag + by ethylene glycol (and not solvent oxidation products) to form Ag nanostructures. The current study enabled a quantitative description of the role of PVP in nanoparticle shape-control and demonstrates a unique opportunity to design nanostructures by combining nanoparticle synthesis with polymer design to introduce specific physicochemical properties.

show abstract

Section: Resultsmentioning

confidence: 99%

Chemical Identity of Poly(N-vinylpyrrolidone) End Groups Impact Shape Evolution During the Synthesis of Ag Nanostructures

et al. 2020

View full text Add to dashboard Cite

show abstract

“…To first discern the formation of GA and quantifying its concentration in all three glycols, we heated EG, DEG and PEG at 150 °C for 1 h and performed an spectrophotometric method that involves the oxidation of GA to glyoxal by perchloric acid in the presence of 2,4-dinitrophenylhydrazine (DNPH) to form glyoxal bis-2,4-dinitrophenylhydrazone. 39 (Details of the experiment are given in ESI †.) Absorbance spectra (Fig.…”

Section: Plausible Mechanism For Formation Of Precursor Complexmentioning

confidence: 99%

Chain length dependence of polyol synthesis of zinc ferrite nanoparticles: why is diethylene glycol so different?

et al. 2013

View full text Add to dashboard Cite

Superparamagnetic ZnFe2O4 nanoparticles with size range of 28-38 nm were synthesized by polyol process based on use of varying chain length glycols as solvent. We have offered, for the first time, the plausible mechanism behind in situ formation of zinc ferric oxalate hydroxide hydrate [Fe2Zn(C2O4)2(OH)3](+)·4H2O complex from diethylene and polyethylene glycol. We are also reporting, the magnetic properties of above complexes. We have found a ferromagnetic ordering in precursor complex compounds. The intermediate hydrocarbon chain between the oxalato bridged metal cations plays a crucial role in obtaining anomalous magnetic behavior. ZnFe2O4 nanoparticles obtained after annealing the DEGylated precursor complex (precursor complex formed in diethylene glycol) showed the highest superparamagnetic (SPM) behavior (22.4 emu g(-1)) among others. The reasons for anomalous SPM behavior of ZnFe2O4 nanoparticles are explained on the basis of the degree of inversion of the spinel structure, high surface-to-volume ratio, which causes non-collinear spin arrangement in a surface layer and higher oxygen concentration on the surface of dead organic layer, which increases the unpaired valence electrons leading to uncompensated surface spins.

show abstract

“…NMR and gas chromatography-mass spectrometry proved unsuitable for confirming GA production and quantifying its concentration. 11 Thus, we relied on an established spectrophotometric method that involves the oxidation of GA to glyoxal by perchloric acid in the presence of 2,4-dinitrophenylhydrazine (DNPH) to form glyoxal bis-2,4-dinitrophenylhydrazone. 12 Specifically, 1 mL of analyte is added to 5 mL of DNPH solution (0.044 g of DNPH in 57 mL of 70% perchloric acid and 32 mL of water) and 20 mL of water, boiled for 1 h, then cooled with ice.…”

mentioning

confidence: 99%

On the Polyol Synthesis of Silver Nanostructures: Glycolaldehyde as a Reducing Agent

et al. 2008

View full text Add to dashboard Cite

The polyol synthesis is a popular method of preparing metal nanostructures, yet the mechanism by which metal ions are reduced is poorly understood. Using a spectrophotometric method, we show, for the first time, that heating ethylene glycol (EG) in air results in its oxidation to glycolaldehyde (GA), a reductant capable of reducing most noble metal ions. The dependence of reducing power on temperature for EG can be explained by this temperature-dependent oxidation, and the factors influencing GA production can have a profound impact on the nucleation and growth kinetics. These new findings provide critical insight into how the polyol synthesis can be used to generate metal nanostructures with well-controlled shapes. For example, with the primary reductant identified, it becomes possible to evaluate and understand its explicit role in generating nanostructures of a specific shape to the exclusion of others.

show abstract

A spectrophotometric method for the micro determination of glycolaldehyde

Cited by 6 publications

References 0 publications

Chemical Identity of Poly(N-vinylpyrrolidone) End Groups Impact Shape Evolution During the Synthesis of Ag Nanostructures

Chemical Identity of Poly(N-vinylpyrrolidone) End Groups Impact Shape Evolution During the Synthesis of Ag Nanostructures

Chain length dependence of polyol synthesis of zinc ferrite nanoparticles: why is diethylene glycol so different?

On the Polyol Synthesis of Silver Nanostructures: Glycolaldehyde as a Reducing Agent

Contact Info

Product

Resources

About