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: Under stress, sucrose accumulation was observed in wilting strains (poor performers) and the most dramatic response to water stress was the accumulation of citric acid in strains T25 and T256 as compared to T185 and T466.
Abstract: Two photoperiodic cotton (Gossypium hirsutum L.) strains (T185 and T466) which had been empirically selected because of poor performance and two strains (T25 and T256) selected because of enhanced performance under field water stress were evaluated for stress-induced changes in their organic acids and carbohydrates. Profiles and quantitation of organic acids and carbohydrates from aqueous extractions of cotton leaf tissue were determined by high performance liquid chromatography. In all cases, the water-stressed plants showed two to five times greater amounts of organic acids and carbohydrates over the values determined for the irrigated samples. Under stress, sucrose accumulation was observed in wilting strains (poor performers) probably related to rate of translocation out of the leaf. The most dramatic response to water stress was the accumulation of citric acid in strains T25 and T256 as compared to T185 and T466. Citric/malic acid ratios for both the irrigated and water-stressed samples of T25 and T256 were twice those of T185 and T466.
115 citations
TL;DR: In this article, agricultural byproducts, base-extracted and reacted with citric acid (CA), were compared to demonstrate their ability to adsorb copper ions (Cu2+) from solution.
115 citations
TL;DR: Intracellular nitrogen limitation and the increase in intracellular NH4+ concentration are the most important factors influencing citric acid formation in yeasts.
Abstract: A suitable strain and important factors influencing citric acid formation in yeasts were identified. Candida oleophila ATCC 20177 was chosen as the best citric acid producer from several Candida strains. Yields of 50 g/l citric acid were produced in shake flask and 80 g/l in fed-batch fermentations with 1.5 and 3 g/l NH4Cl under non-optimized conditions. Ammonium nitrogen was identified as the limiting substrate for citrate formation. Citric acid excretion begins a few hours after exhaustion of nitrogen in the medium. The importance of intracellular nitrogen limitation was clarified by elemental analysis of C. oleophila biomass. The nitrogen content of C. oleophila biomass decreased from 7.45% during the growth phase to 3.96% in the production phase. The biomass contained less carbon and more trace elements in the growth phase compared with the production phase. Relatively high intracellular NH4
+ concentration of about 1.2 mg/g biomass (~37.4 mM) was found during the production phase. The low intracellular nitrogen content and increase of intracellular NH4
+ concentration, possibly caused by proteolysis following extracellular nitrogen exhaustion, trigger citric acid production. Intracellular nitrogen limitation and the increase in intracellular NH4
+ concentration are the most important factors influencing citric acid formation in yeasts.
115 citations
TL;DR: In this paper, a novel method for preparing NiW/USY-Al 2 O 3 ultradeep hydrodesulfurization (HDS) catalysts via combined citric acid-assisted hydrothermal dispersion of active metals and HY zeolite was presented.
115 citations
TL;DR: In this paper, the optimum conditions for producing rice starch enriched in slowly digestible and resistant fractions by citric acid treatment determined by a response surface methodology (RSM) model equation, were: reaction temperature, 128.4°C; reaction time, 13.8
115 citations