Topic
Oxalic acid
About: Oxalic acid is a research topic. Over the lifetime, 11584 publications have been published within this topic receiving 173263 citations. The topic is also known as: ethanedioic acid & H2ox.
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TL;DR: In this paper, the authors investigated the reaction between gaseous ozone and seven particulate methoxyphenols, biomass tracers, and found that vanillic acid was the main oxidation product of syringaldehyde.
50 citations
TL;DR: In this article, surface-enhanced Raman spectroscopy (SERS) spectra have been obtained for different species (CO, CN−, ethylene and oxalic acid) adsorbed on nanostructured electrodes prepared by deposition of Pt, Pd, Rh and Pd nanoparticles on either gold or platinum electrodes.
Abstract: Surface-enhanced Raman spectroscopy (SERS) spectra have been obtained for different species (CO, CN−, ethylene and oxalic acid) adsorbed on nanostructured electrodes prepared by deposition of Pt, Pd, Rh and Pd:Pt nanoparticles on either gold or platinum electrodes. These examples not only refer to stable adlayers of typical adsorbates, such as carbon monoxide and cyanide, but also to adsorbates that may be easily either reduced or oxidized at some of these metals, such as ethylene and oxalic acid. On the other hand, the SERS spectrum of CO adsorbed on a transition metal alloy (Pd/Pt = 1) electrode is obtained for the first time. Taking advantage of the high surface enhancement factor found for these nanostructured samples (∼550 for CN− on Pt at − 0.4 V/SCE), ethylene and oxalic SER spectra are obtained for pure platinum electrodes. The importance of the charge-transfer mechanism for the enhancement in the case of Pt is evidenced according to the ratio of the band intensities for CO or CN− to the oxalic ones. Specific advantages of the nanoparticles-on-electrode approach are highlighted. Copyright © 2005 John Wiley & Sons, Ltd.
50 citations
TL;DR: In this article, a molecularly imprinted polymer (MIP) film deposited by electropolymerization, based on carbazole monomer and luteolin template, was used to improve the selectivity.
50 citations
TL;DR: In this paper, it was shown that raphide crystals of Vitis vinifera berries are composed of calcium oxalate monohydrate, which is the first evidence for the formation of oxalic and tartaric acids from ascorbic acid via two distinct pathways operating within the same organism.
Abstract: Biomineralisation in the fleshy pericarp of berries of Vitis vinifera L. gives rise to crystals of two distinct forms, viz. raphides and druses, which are found in exocarp and endocarp cells respectively. Druses have generally been considered as crystalline aggregates of calcium oxalate. However, the organic moiety of raphide crystals has been commonly accepted as tartrate, although we have found no analytical data to support that assumption. We now present TEM and X-ray powder diffraction analysis data showing that raphide crystals of V. vinifera berries are composed of calcium oxalate monohydrate. This work also established ascorbic acid as the biosynthetic precursor of both oxalic and tartaric acids. When ascorbic acid labelled with 14C at position 1 was introduced into berries via the rachis, 21% and 52% of the added radiolabel was recovered as oxalic and tartaric acids respectively. Purified crystals from the radiolabelled grape berries contained approximately 20% of the original radioactivity, further confirming the role of ascorbic acid in oxalic acid biosynthesis. To our knowledge, this is the first evidence to be published on the formation of oxalic and tartaric acids from ascorbic acid via two distinct pathways operating within the same physiological entity (organ).
50 citations
TL;DR: Porous anodic alumina thin films with iridescent colors were fabricated electrochemically in phosphoric acid electrolyte as discussed by the authors, and multicolor patterns were obtained by an organics-assisted process.
50 citations