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: Several isotopic (13 C/ 12 C, 15 N/ 14 N, 18 O/ 16 O, 2 H/ 1 H, 34 S/ 32 S) and chemical-physical parameters (pH, fruit weight, juice yield, titratable acidity, total soluble solids, skin resistance, flesh firmness, colorimetric characteristics, weight loss after harvesting, antioxidant activity, earliness index, total nitrogen, ascorbic acid, synephrine, anthocyanins and polyphenols, citric acid, malic acid and glucose and fructose
96 citations
TL;DR: In this paper, the authors investigate the adsorption of citric acid molecules to the (0001) and (010) surfaces of hydroxyapatite and find that the acid molecules attach to the surfaces, rather than remain in the bulk water.
Abstract: Molecular dynamics simulations are employed to investigate the adsorption of citric acid molecules to the (0001) and (010) surfaces of hydroxyapatite. An aqueous environment is added through the explicit introduction of water molecules in the simulation cell. The citric acid is found to attach to the surfaces, rather than remain in the bulk water and the calculated average adsorption energies are +291.4 kJ mol−1 and −17.4 kJ mol−1 for the (0001) and (010) surfaces respectively. Citric acid thus adsorbs to the (010) surface and hence would inhibit growth of this surface more effectively than growth of the (0001) plane with which it does not interact strongly in an aqueous environment where the water competes with the citric acid for adsorption. The implication is that the hydroxyapatite crystal would grow more rapidly in the [0001] direction than in the [010] direction in the presence of citric acid, leading to elongation in the c-direction and more pronounced expression of the (010) surface in the hydroxyapatite morphology.
96 citations
TL;DR: Chemical inactivation appears to be a promising method of removing aflatoxin from food commodities by means of 1N aqueous citric acid.
95 citations
TL;DR: In this article, the role of pH in adsorption of Cu(II) from aqueous solutions containing chelating agents on chitosan was emphasized, and the maximum adaption capacity was obtained within each optimal pH range determined from titration curves of the chelated solutions.
Abstract: The role of pH in adsorption of Cu(II) from aqueous solutions containing chelating agents on chitosan was emphasized. Four chelating agents including ethylenediaminetetraacetic acid (EDTA), citric acid, tartaric acid, and sodium gluconate were used. It was shown that the adsorption ability of Cu(II) on chitosan from its chelated solutions varied significantly with pH variations. The competition between coordination of Cu(II) with unprotonated chitosan and electrostatic interaction of the Cu(II) chelates with protonated chitosan took place because of the change in solution pH during adsorption. The maximum adsorption capacity was obtained within each optimal pH range determined from titration curves of the chelated solutions. Coordination of Cu(II) with the unprotonated chitosan was found to dominate at pH below such an optimal pH value.
95 citations
Patent•
06 Oct 1978TL;DR: In this paper, an oral composition is disclosed which comprises a stannous salt such as Stannous Fluoride, a water-soluble fluoride salt, a sodium fluoride and an orally acceptable acid such as Lascorbic acid, lactic acid, malonic acid, tartaric acid and citric acid.
Abstract: An oral composition is disclosed which comprises a stannous salt such as stannous fluoride, a water-soluble fluoride salt such as sodium fluoride and an orally acceptable acid such as L-ascorbic acid, lactic acid, malonic acid, tartaric acid, citric acid, hydrochloric acid and pyrophosphoric acid, the molar ratio of fluoride ion to stannous ion being in the range of 3.2 to 7:1, preferably 3.5-6:1, in an aqueous condition and the pH of the composition being in the range of from 2 to 4. The composition exhibits excellent effects on the inhibition of dental caries.
95 citations