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 effects of pH, oxine concentration and water-soluble complexing agents (oxalic acid, tartaric acid and hydrocyanic acid) have been investigated.
298 citations
TL;DR: Results indicate that Al tolerance in the roots and leaves of buckwheat is achieved by the formation of a nonphytotoxic Al-oxalate (1:3) complex.
Abstract: Buckwheat (Fagopyrum esculentum Moench. cv Jianxi), which shows high Al resistance, accumulates Al in the leaves. The internal detoxification mechanism was studied by purifying and identifying Al complexes in the leaves and roots. About 90% of Al accumulated in the leaves was found in the cell sap, in which the dominant organic acid was oxalic acid. Purification of the Al complex in the cell sap of leaves by molecular-sieve chromatography resulted in a complex with a ratio of Al to oxalic acid of 1:3. A 13C-nuclear magnetic resonance study of the purified cell sap revealed only one signal at a chemical shift 164.4 ppm, which was assigned to the Al-chelated carboxylic group of oxalic acid. A 27Al-nuclear magnetic resonance analysis revealed one major signal at the chemical shift of 16.0 to 17.0 ppm, with a minor signal at the chemical shift of 11.0 to 12 ppm in both the intact roots and their cell sap, which is consistent with the Al-oxalate complexes at 1:3 and 1:2 ratios, respectively. The purified cell sap was not phytotoxic to root elongation in corn (Zea mays). All of these results indicate that Al tolerance in the roots and leaves of buckwheat is achieved by the formation of a nonphytotoxic Al-oxalate (1:3) complex.
298 citations
291 citations
TL;DR: In this article, the authors investigated the performance of both partial and total oxidization of Ag(111) single crystal surface at pressures of up to 50 Torr, and showed that H-transfer rather than C-C cleavage is rate-determining in the combustion of both ethylene and ethylene oxide.
289 citations
TL;DR: Observations of the rapid decrease in viscosity and increase in reducing end groups are indicative of a splitting of glycosidic bonds within the pectin chain macromolccules, which strongly indicate the formation of an unsaturated compound.
288 citations