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Carbohydrates acids

In addition to the effect of polar groups (discussed above) and the electrostatic effect of neighboring anionic charge, there are other factors that affect carbohydrate acidity. Among them are steric and entropy effects and intramolecular hydrogen bonding. [Pg.63]

Optical rotatory dispersion studies on lactones of aldonic acids and other carbohydrate acids were made by Hirst et al.11 and later by Okuda et al.7S The latter workers related the absolute configuration at C-2 of aldono-1,4-lactones to the sign of the Cotton effect. [Pg.210]

In 1941 Gakhokidze40 realized a different type of Grignard synthesis on a carbohydrate acid derivative. Methyl L-ery(liro-3,4,5-trimethoxy-2-oxovalerate (XXXII), was treated with one mole of methylmagnesium iodide to produce methyl 2-methyl-2-hydroxy-L-er /(firo-3,4,5-trimethoxy-valerate (XXXIII). The configuration of the second carbon atom in... [Pg.269]

Phenol-formaldehyde type polymers had been the only exterior-durable adhesives for wood bonding, until the recent limited use of isocyanates. Both systems are petrochemical-based. Several researchers substituted carbohydrates for part of phenolic adhesives (1-4) > producing solid, fusible novolak resins. Recently, reaction of carbohydrate acid-degradation products with phenol and formaldehyde has produced liquid resols (5). Gibbons and Wondolowski (6,7) replaced a considerable amount of phenol with carbohydrate and urea to pro-... [Pg.367]

First, it is important to stress that asymmetric chemical transformations are not a recent invention on the contrary, we are now well past the 100th anniversary of tlie first reported case in the literature by Emil Fischer who in 1889-1890 found that HCN addition to r-arabinose produced two epimeric carbohydrate acids after hydrolysis [1]. Soon after, a second example [2] - NaHg [sodium amalgam] reduction of D-fructose - was published, together with some thoughts on the fundamental importance of these observations for the future. In the first decade of the new century McKenzie et al. published a series of papers titled Studies in Asymmetric Synthesis , a phrase which, thus, was by no means created only in the re-... [Pg.29]

Summing the four steps in Fignre 10.13 provides step (5), which indicates that electrons are being transferred from carbohydrates to lignin, leading to stabilized carbohydrate acid end units and lignin fragmentation. One wonld not expect the... [Pg.363]

Acetylation Desulfation of Carbohydrate Acid Sulfates, M. L. Wolfrom and Rex Montgomery,/. Amer. Chem. Soc., 72, 2859-2861 (1950). [Pg.31]

The remainder of this chapter will be devoted, first, to a discussion of the preparation and chemistry of carbohydrate acids and oxidation products and, finally, to the effect of specific oxidants. [Pg.301]

As quoted in Kraus (1884), shortly after Heyne also H. F. Link observed acid fluctuations in Bryophyllum. Then in 1865, J. Liebig recorded day-night reciprocal carbohydrate-acid fluctuations in succulents (see Kraus, 1884), and Mayer in 1887 noted that organic acids produced in the dark were converted to carbohydrates... [Pg.45]

L-ascorbic acid or vitamin C (Fig. 16.1) is a water-soluble carbohydrate acid with antioxidant properties and is an essential nutrient for humans. It was first isolated from animal and plant sources in 1928. Five years later, the molecular structure of crystallised ascorbic acid was elucidated. ... [Pg.382]

From Diol Groups on Cyclic Carbohydrates.—Acid-catalysed acetonation of D-glycero-n-galacto-h Xo Q yielded only 1,2 3,4 6,7-tri-O-isopropylidene-... [Pg.32]


See other pages where Carbohydrates acids is mentioned: [Pg.136]    [Pg.257]    [Pg.219]    [Pg.59]    [Pg.258]    [Pg.131]    [Pg.135]    [Pg.104]    [Pg.83]    [Pg.118]    [Pg.362]    [Pg.130]    [Pg.307]    [Pg.5]    [Pg.492]    [Pg.189]    [Pg.492]    [Pg.569]    [Pg.971]   
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See also in sourсe #XX -- [ Pg.39 , Pg.128 , Pg.143 , Pg.154 , Pg.222 ]

See also in sourсe #XX -- [ Pg.81 , Pg.441 ]

See also in sourсe #XX -- [ Pg.165 ]




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Acetic acid Bacteria Carbohydrate utilization

Acetic acid carbohydrate fermentation product

Acetic acid, trifluoro-, anhydride applications of, in carbohydrate

Acetic acid, trifluoro-, anhydride applications of, in carbohydrate chemistry

Acid anhydrides with carbohydrates

Acidic groups, carbohydrates

Acidity, carbohydrate

Acidity, carbohydrate

Acrylic acid Carbohydrates

Aldonic acids carbohydrates, degradation

Amino acid Carbohydrate integration

Amino acid carbohydrates

Amino acid-carbohydrate linkages

Amino acids combinations with carbohydrates

Anti-carbohydrate antibodies glucuronic acid

Aspartic acid, carbohydrate-based

Boric acid, carbohydrate complexation with

Boronic acids interactions with carbohydrates

Butyric acid, from carbohydrates

Butyric acid, from carbohydrates ester

CARBOHYDRATE METABOLISM Utilized-Oxidized-Reduced-Acid

Carbohydrate Krebs-citric acid cycle

Carbohydrate amino acids and

Carbohydrate chemistry carboxylic acid

Carbohydrate fatty acid ester

Carbohydrate fatty acid polyesters

Carbohydrate functionalized polymers carboxylic acid

Carbohydrate metabolism Krebs tricarboxylic acid cycle

Carbohydrate metabolism acid cycle

Carbohydrate orthocarboxylic acid esters

Carbohydrate-amino acid linkages Glycosyl linkage

Carbohydrate-amino acid linkages structures

Carbohydrate-amino acid linkages types

Carbohydrate-based nucleic acids

Carbohydrate-nucleic acid interactions

Carbohydrates 45 carboxylic acids, reaction with

Carbohydrates Strecker amino acid synthesis

Carbohydrates aldonic acids 400

Carbohydrates and nucleic acids

Carbohydrates boric acid

Carbohydrates carboxylic acids

Carbohydrates carboxylic acids, conjugated, reaction with

Carbohydrates carboxylic acids, enolates

Carbohydrates carboxylic acids, preparation from

Carbohydrates chloroacetic acid

Carbohydrates humic acid isolate

Carbohydrates linked to amino acids and proteins

Carbohydrates orthocarboxylic acid

Carbohydrates periodic acid cleavage

Carbohydrates phenol-sulfuric acid reaction

Carbohydrates phosphoric acid ester

Carbohydrates protection with boronic acids

Carbohydrates pyruvic acid oxidation

Carbohydrates uronic acids

Carbohydrates with boric acid

Carbohydrates with nitric acid

Carbohydrates with periodic acid

Carbohydrates, Nucleic Acids, and Lipids

Carbohydrates, acidic derivatives

Carbohydrates, acidic derivatives VOLUME

Carbohydrates, acidic derivatives alkaline hydrolysis

Carbohydrates, acidic derivatives analysis

Carbohydrates, acidic derivatives complexes with borate

Carbohydrates, acidic derivatives preparation

Carbohydrates, acidic derivatives reactions

Carbohydrates, acidic derivatives solution

Carbohydrates, acidic derivatives stability

Carbohydrates, acidic derivatives with pyridine

Carbohydrates, and fatty acid diseases deficiency

Carbohydrates, enzymic synthesis from fatty acids

Carboxylic acid anhydrides with carbohydrates

Complex carbohydrates acid hydrolysis

Determination of amino acids and carbohydrates

Dicarboxylic acids, synthesis from carbohydrates

Fatty acids from carbohydrates

Gel-filtration column chromatography, amino acid analysis and carbohydrate determination

Hydrolysis, acid, carbohydrates

Hydrolysis, acid, carbohydrates amides

Hydrolysis, acid, carbohydrates esters

Hydrolysis, acid, carbohydrates polysaccharides

Individual Amino Acids and Carbohydrate Residues

Lactic acid bacteria carbohydrate metabolism

Lactic acid-forming bacteria carbohydrate fermentation

Natural Carbohydrate Amino Acids

Nitric acid carbohydrates

Nitric acid of carbohydrates

Nucleic acid components carbohydrates

Nucleic acids, carbohydrate constituents

Orthocarboxylic acid derivatives of carbohydrates

Periodic Acid Oxidation of Carbohydrates

Periodic acid cleavage of carbohydrates

Periodic acid, collagen carbohydrate

Primary Alcohol Groups in Carbohydrates to Carboxylic Acids

Propionic acid, carbohydrate esters

Propionic acid, carbohydrate formation

Reactions of carbohydrates with strong acid

Sialic Acid in Carbohydrate Chains of the N-Acetyllactosamine Type

Sialic Acid in O-Glycosidically Linked Carbohydrate Chains

Skill 12.1o-Recognize that inorganic and organic compounds (e.g., water, salt, carbohydrates, lipids, proteins, nucleic acids) are essential to processes within living systems

Sulfonic acids carbohydrates

Synthesis of Sialic Acid Containing Carbohydrates

Synthetic Carbohydrate Amino Acids

Uronic acids carbohydrates containing

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