Topic
Citric acid
About: Citric acid is a research topic. Over the lifetime, 17745 publications have been published within this topic receiving 277125 citations. The topic is also known as: citrate & H3cit.
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TL;DR: In this article, a maize root axis was passed through a (KH2PO4)-P-33 labelled patch of soil and organic acids or distilled water (control) were added to the patch at concentrations of 1 and 10 mM over a subsequent 4-day period.
Abstract: The exudation of organic acids into the rhizosphere by plant roots has been hypothesized to be one potential mechanism by which plants can enhance the mobilization of poorly soluble nutrients in the soil. The experiments undertaken in this study were aimed at determining whether the organic acids, citrate and oxalate, could enhance the uptake of P-33 from a calcareous soil with a high P fixation capacity (Typic rendoll). Soil-filled rhizosphere microcosms were constructed which allowed the growth of a single maize root axis through a (KH2PO4-)-P-33 labelled patch of soil. After passage of the root through the P-33-labelled soil, organic acids or distilled water (control) were added to the patch at concentrations of 1 and 10 mM over a subsequent 4-day period. While oxalate resulted in an approximately two-fold enhancement in shoot P-33 accumulation, citrate did not result in a significant enhancement of P-33 uptake above controls to which only distilled water were added. No synergistic effect on shoot P-33 accumulation was observed when both oxalate and citrate were added to the soil simultaneously. We hypothesize that the observed differences in shoot P-33 accumulation by the two organic acids were due primarily to the differences in their biodegradation rate and P mobilization reactions. This study demonstrates that in vivo, organic acids can cause a significant enhancement of plant P uptake, however, the magnitude of the P mobilization response is likely to be highly context dependent. (C) 2002 Published by Elsevier Science Ltd. (Less)
166 citations
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166 citations
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TL;DR: The erosion of enamel by solutions of dietary acids is influenced by the interplay of pH, acid concentration and presence of calcium and these variables and in particular the concentration of calcium could be manipulated to produce soft drinks with reduced erosivity to enamel.
165 citations
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TL;DR: A strong correlation has been found between the levels of nickel and citric acid in the leaves of 17 New Caledonian plant species which show a range of nickel-accumulating ability, and purified extracts of these plants contain nickel as a citrate complex.
165 citations
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TL;DR: Normal foods elicit a salivary flow rate which is a high fraction of the maximum secretory rate achieved in response to acid, and the water content of the food bolus varied over a wide range.
165 citations