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.
Papers published on a yearly basis
Papers
More filters
TL;DR: The effect of foliar silicon (Si) applications on metabolic changes in strawberry plants (Fragaria x ananassa Duch) was studied in this article, where Silicon was used in the form of the potassium (K) salt.
Abstract: The effect of foliar silicon (Si) applications on metabolic changes in strawberry plants (Fragaria x ananassa Duch.) was studied. Silicon was used in the form of the potassium (K) salt. Foliar spray with K silicate (containing 0, 4.25, 8.50, 12.75, or 17.00 mm of Si) showed increased chlorophyll content and plant growth. Potassium silicate treatments also induced metabolic changes such as increases in citric acid and malic acid levels, and decreases in fructose, glucose, sucrose, and myo‐inositol contents. The treated tissues also had higher ratios of fatty acid unsaturation [(18:2+18:3)/18:1] in glycolipids and phospholipid and elevated amounts of membrane lipids. These results suggest that Si has beneficial effects on strawberry plant metabolism.
112 citations
TL;DR: In this paper, Boron carbide powder has been prepared by carbothermal process using boric acid and citric acid as raw materials and the product obtained has been characterized by X-ray diffraction (XRD), chemical analysis, particle size analysis and scanning electron microscopy.
111 citations
TL;DR: In this article, the performance of supported LaCoO3 perovskites with 10 and 20% loading were obtained by incipient wetness impregnation of different Ce1−xZrxO2 supports with a "citrate" solution, prepared from La and Co nitrates, and citric acid.
Abstract: Supported LaCoO3 perovskites with 10 and 20 wt.% loading were obtained by incipient wetness impregnation of different Ce1−xZrxO2 (x = 0–0.3) supports with a “citrate” solution, prepared from La and Co nitrates, and citric acid. Ce1−xZrxO2 were also prepared using the “citrate method”. All materials were calcined at 700 °C for 6 h and investigated by N2 adsorption at −196 °C, XRD and XPS. XRD patterns evidenced the formation of a pure perovskite phase. These materials were tested in toluene total oxidation in the temperature range 100–500 °C. All catalysts showed a lower T50 than the corresponding Ce1−xZrxO2 supports or pure LaCoO3 perovskite. The activity of the catalysts was found to increase with the perovskite loading, irrespective of the support composition. For the same loading, the support composition influences drastically the oxidative abilities of LaCoO3.
111 citations
TL;DR: The inhibitory substance for citrate metabolism synthesized by enzymic action from fluoroacetate has been isolated as a compound in crystalline form of great potency and inhibits the disappearance of approximately 300 times its weight of citric acid in 30 min.
Abstract: It has been suggested that the toxicity of fluoroacetate is due to the enzymic synthesis of a fluorotricarboxylic acid, which 9jams9 the tricarboxylic acid cycle at the citrate stage. This communication presents the proof of this hypothesis. The inhibitory substance for citrate metabolism synthesized by enzymic action from fluoroacetate has been isolated as a compound in crystalline form of great potency. Under the conditions of test it inhibits the disappearance of approximately 300 times its weight of citric acid in 30 min. The final isolation involved a separation from citric acid by the use of ion-exchange resin, and fractional extraction with ether. It is a monofluorotricarboxylic acid, as shown by its migration on a paper chromatogram, by its fluorine content (estimated spectrochemically), and by its titration curve. It does not give the colour reaction with sodium sulphide for pentabromacetone produced from citric acid by the usual methods. It gives an infra-red band which may be expected from a C-F bond. By a process of exclusion, it is considered to be a fluorocitric acid; a final decision must await synthesis.
111 citations
TL;DR: In this article, the authors present a brief summary of the recent developments on citric acid production, describing micro-organisms, production techniques, and substrates, etc., and describe the most important organic acid produced in tonnage and extensively used in food and pharmaceutical industries.
Abstract: Citric acid is the most important organic acid produced in tonnage and is extensively used in food and pharmaceutical industries. It is produced mainly by submerged fermentation using Aspergillus niger or Candida sp. from different sources of carbohydrates, such as molasses and starch based media. However, other fermentation techniques, e.g. solid state fermentation and surface fermentation, and alternative sources of carbon such as agro-industrial residues have been intensively studied showing great perspective to its production. This paper reviews recent developments on citric acid production by presenting a brief summary of the subject, describing micro-organisms, production techniques, and substrates, etc.
111 citations