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: In this article, the synthesis, crystal structures, and basic physicochemical properties of six co-crystals of piracetam were reported, including l-tartaric acid, with citric acid in a 1:1 and 3:2 ratio.
Abstract: We report the synthesis, crystal structures, and basic physicochemical properties of six co-crystals of piracetam. Co-crystals of piracetam with l-tartaric acid, with citric acid in a 1:1 and 3:2 ratio, with racemic mandelic acid, and with l-mandelic acid, as well as a piracetam−citric acid ethanol solvate were found in a focused screening approach. Sample amounts of up to several hundred milligrams of each co-crystal were obtained from either solvent-drop grinding, solution evaporation, or crystallization from solution. Crystal structure analysis revealed that the often observed amide-carboxylic acid R22(8) synthon is rarely found in the herein reported crystal structures. The mentioned motif can be used as a target for hydrogen bonds; however, in presence of a multitude of hydrogen bond donors and acceptors it cannot serve for an anticipation of co-crystals. Compared to piracetam the piracetam−l-tartaric acid co-crystal shows improved hygroscopic properties.
71 citations
TL;DR: In this paper, the formation constants of several metal complexes of citrate and tricarballylate, and of the hydrogen complexes in which HA2− act as ligands, have been determined by a titrimetric method.
71 citations
TL;DR: In this article, the chlorinating enzyme chloroperoxidase (CPO) from the fungus Caldariomyces fumago was converted in the presence of sodium chloride and hydrogen peroxide.
71 citations
TL;DR: A mutant strain of Escherichia coli K-12 that utilizes citrate as a sole source of carbon and energy was isolated and is capable of utilizing cis- and trans-aconitate, but only if it is preinduced by growth on citrate.
Abstract: A mutant strain of Escherichia coli K-12 that utilizes citrate as a sole source of carbon and energy was isolated. Citrate utilization arose as the consequence of two mutations in genes citA and citB, which are linked to the gal operon. The mutant strain expresses a semiconstitutive citrate transport system, and it utilizes both citrate and isocitrate as carbon and energy sources. It is capable of utilizing cis- and trans-aconitate, but only if it is preinduced by growth on citrate.
71 citations
TL;DR: In this article, it was shown that Ni(II)-citrate-malate crystals obtained from a Ni-citratemalate solution simulating the extract, contain Ni exclusively in the form of an anionic Ni-II-citrato complex.
71 citations