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 paper, ordered mesoporous carbon materials (OMCs) were synthesized with the use of citric acid as an environmentally friendly catalyst to catalyze the polymerization of resorcinol/formaldehyde resin.
Abstract: Ordered mesoporous carbon materials (OMCs) were synthesized with the use of citric acid as an environmentally friendly catalyst to catalyze the polymerization of resorcinol/formaldehyde resin. The obtained carbon materials with high thermal stability have a 2D hexagonal mesopore system with uniform pore size of ∼5.2 nm and high surface area of 612∼851 m2 g−1, which were available under a wide composition range of reaction systems at the reaction temperature of 50–80 °C and the molar ratio of formaldehyde to citric acid of ≥3. The presence of citric acid in the synthesis system can enhance the hydrogen bonding between the triblock copolymer and resol and further introduce more micropores to the final carbon material, which is favorable for CO2 adsorption. The nitridation of the OMCs in ammonia flow at the temperature of 650–1000 °C is demonstrated to be effective in introducing basic functionalities that enhances the specific interaction of CO2 and adsorbent. The N-doped OMCs exhibit enhanced CO2 uptake with a CO2 capture capacity of 3.46 mmol g−1 for the 1000 °C-nitrided sample. Both textural and surface chemistry influenced the CO2 capture performance of the resultant mesoporous carbon adsorbents.
143 citations
TL;DR: The acid and heat-moisture treatments reduced swelling power and viscosity, but increased solubility of the starches, while the crystalline structure did not change, and the results are useful in production of RS for functional food application.
143 citations
TL;DR: In this paper, the distribution of citric acid between water and trialkylamine C 7 -C 9 dissolved in 7 various diluents (p -xylene, toluene, benzene, MIBK, 1-octanol, methylene chloride, chloroform) was studied.
143 citations
TL;DR: Combined treatment with oral citrate and intramuscular magnesium sulfate and injection restored net tubular reabsorption of citrate to normal and partially improved the hypocitraturia in patients with malabsorption.
Abstract: We measured serum and urinary citrate, oxalate, calcium, and magnesium in 22 normal subjects and in 16 patients with malabsorption. The patients had subnormal levels of serum citrate and magnesium during fasting, subnormal 24-hour levels of urinary citrate, magnesium, and calcium, and excessive levels of urinary oxalate. Daily citrate excretion averaged only 15 per cent of normal. The hypocitraturia in the patients resulted from a subnormal filtered load of citrate and abnormally high net tubular reabsorption of the anion. An oral citrate supplement raised both the serum concentration and the filtered load of citrate to normal fasting values, but net tubular reabsorption remained abnormally high and urinary excretion abnormally low. Intramuscular magnesium sulfate, which corrected the hypomagnesemia and hypomagnesuria, had no effect on serum citrate or its filtered load. Nevertheless the injection restored net tubular reabsorption of citrate to normal and partially improved the hypocitraturia. Fu...
143 citations
141 citations