Tri-carboxylic acids

Di- and tri-carboxylic acids. Resolution by anion-exchange chromatography. [Bengtsson and Samuelson Anal Chim Acta 44 217b 1969.]... 

Chemical analysis revealed that commercial food grade copper chlorophyllin is not a single, pure compound, but is a complex mixture of structurally distinct porphyrins, chlorin, and non-chlorin compounds with variable numbers of mono-, di-, and tri- carboxylic acid that may be present as either sodium or potassium salts. Although the composition of different chlorophyllin mixtures may vary, two compounds are commonly found in commercial chlorophyllin mixtures trisodium Cu (II) chlorin Cg and disodium Cu (II) chlorin which differ in the number of... 

Complexing agents Citric acid 2-Hydroxy-l,2,3-propane tri-carboxylic acid... 

In his review, Miller (1998) recalls other compounds that have been synthesized under primitive Earth conditions, such as di- and tri-carboxylic acids, C2-C10 fatty acids, porphin, imidazoles, and he also mentions products that have not been... 

A. Water, polyhydric alcohols, aminoalcohols, oxyacids, polyphenols, di- and tri-carboxylic acids. 

Sugar acids, mono-, di-, and tri-carboxylic acids, keto-, hydroxy-acids as well as unsaturated organic acids are present in foods. While uronic acids participate in the browning reaction, others might accelerate or retard the reaction. 

The more than 50 gibberellins (GAs) occur as free 19-carbon or 20-carbon diterpenoid mono-, di-, or tri-carboxylic acids and as the glucosides and glucosyl esters. See Jones and MacMillan (11) for a recent discussion. 

Carboxylic acids. Of these pyridine acids there are mono-, di-, and tri-carboxylic acids known, which are obtained by oxidation of the corresponding mono-, di-, and tri-methyl homologues. One of the mono-carboxylic acids is known as nicotinic acid and is obtained... 

Common carboxylic acids in the kitchen include dilute ethanoic acid (in vinegar) solid citric acid (2-hydroxypropane-l,2,3-tri-carboxylic acid) - the acid is also found in the juice of lemons and other citrus fruits and tartaric acid (2,3-dihydroxy-butanedioic acid). 

Dissolved organic species have been known to exist in sedimentary basin formation waters since before the turn of the century (5.6.71. A host of aqueous organic species have been identified in sedimentary formation waters including hydrocarbons, mono-, di- and tri-carboxylic acid anions, keto and hydroxy-acids, amino acids, phenols, cresols, and hydroxybenzoic acids (8.9.10.11.121. 

Sulphuric acid esters of tri- 8-hydroxyethyl-/J-propane tri-carboxylic acid ammonium (ThromboHolzinger), polyethylene sulphate sodium, polyanethol (liquoid), polyvinyl alcohol (elvanol), yeast nucleic acid, lignin, saponin, tannin, oromucoid, proteins... 

Domesticine, C19H19O4N was obtained by Kitasato (38) from Nandina domestica Thunb. (Berberidaceae) along with isodomesticine. The fonner melts at 115-117° and has [a] +60.5°. Isodomesticine was obtained in the amorphous condition, but its 0-methyl ether (m.p. 139°, [ ]d +101 to +102° in chloroform) was identical with domesticine 0-methyl ether. Both alkaloids are tertiary, and contain one methoxyl, one phenolic hydroxyl, and a methylenedioxy group. The absorption spectra indicate that these alkaloids are aporphines. Oxidation of domesticine with permanganate was stated to yield 4,5-methylenedioxybenzene-l,2,3-tri-carboxylic acid (38), but this cannot be so in view of the work of Kitasato and Shishido (39) who synthesized epidicentrine and resolved it and showed that the d-base (m.p. 138-139°, [a] +102° in chloroform) was identical with domesticine 0-methyl ether. There remained the determination of the position of the hydroxyl, and this was achieved by a s3mthesis of domesticine 0-ethyl ether (m.p. 132°) (40). Both syntheses followed the well-known routes leading to aporphines. In the first case 6,7-dimethoxy-... 

There is confusion in the literature concerning the nature of the polymers used in glass-ionomers. This stems from the early research of Wilson et al., who studied a range of mono-, di- and tri-carboxylic acid monomers in polymers for cement formation, including itaconic and tricarballic acid [20] and this has led to the assumption that these must be used in practical cements. In fact proprietary materials are all based on the two polymers previously mentioned. 

Methoxantin coenzyme (PQQ, pyrrolo quinoline quinone, 2,7,9-tricarboxy-lff-pyrrolo-[2,3- /]-quinoline-4,5-dione, 4,5-dihydro-4,5-dioxo-lfl-pyrrolo[2,3 quinoline-2,7,9-tri-carboxylic acid) [72909-34-3] M... 

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