Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Carbohydrate acetate production

The Model for 2-acetoxy-3-pentanone. This compound is formed by a condensation of acetic acid and 2-hydroxy-3-pentanone, common carbohydrate fragmentation products. As such it would be expected that C(r) would be important (from the carbohydrate source) and pH since its precursors are affected by both acid and base. The most significant model terms according to Prob > T were C(r) (0.0002)... [Pg.226]

The catalyst can be recycled for 5 times without any loss of activity and selectivity. Apart from the ether or acetal production from bio-based carbohydrates, a strong interest has also been devoted to the etherification of glycerol, and in that context, the use of an acidic heterogeneous catalyst has proved to be successful. In particular, tertiobutanol/glycerol mixtures are transformed into the mono and diethers using Amberlyst-15 as well as H-Y and H-BETA large porous zeolites, the latter catalyst beeing... [Pg.114]

Acetone was originally observed about 1595 as a product of the distillation of sugar of lead (lead acetate). In the nineteenth century it was obtained by the destmctive distillation of metal acetates, wood, and carbohydrates with lime, and pyrolysis of citric acid. Its composition was determined by Liebig and Dumas in 1832. [Pg.94]

Other potential synthetic methods include fermentation (qv) of certain carbohydrates (qv), oxidation of propane, hydrogenation of acetone, and hydrolysis of isopropyl acetate. The hydrogenation of by-product acetone is the only method practiced commercially. [Pg.107]

Acetic 2 Major end product of carbohydrate fermentation by rumen organisms ... [Pg.112]

The nature of the diet sets the basic pattern of metabohsm. There is a need to process the products of digestion of dietary carbohydrate, lipid, and protein. These are mainly glucose, fatty acids and glycerol, and amino acids, respectively. In ruminants (and to a lesser extent in other herbivores), dietary cellulose is fermented by symbiotic microorganisms to short-chain fatty acids (acetic, propionic, butyric), and metabohsm in these animals is adapted to use these fatty acids as major substrates. All the products of digestion are metabohzed to a common product, acetyl-CoA, which is then oxidized by the citric acid cycle (Figure 15-1). [Pg.122]

HPAEC analyses were carried out to determine the oligomeric products released from various pectic substrates after depolymerization by the PL isoenzymes. Action pattern analyses for the concerted action of PL isoenzymes utilized 68% esterified pectin as substrate. One-ml reaction mixtures in a buffer system as detailed in section 2.2. comprising 0.5% (w/v) substrate and 5 U of enzyme were incubated for 30 s to 18 h, and then thermoinactivated. Samples of 750 pi were applied to a Carbopac PA-1 (Dionex) column before the carbohydrates were eluted over a period of 70 min using a gradient of 0.2 M KOH, 0.05 M K-acetate to 0.2 M KOH, 0.7 M K-acetate. Detection employed a Pulsed Electrochemical Detector (PED, Dionex) in the integrated amperometry mode according to the manufacturer s recommendations. [Pg.285]

A useful and simple method for the one-pot preparation of highly functionalized, enanhomerically pure cyclopentanes from readily accessible carbohydrate precursors has been designed by Chiara and coworkers [73]. The procedure depends on a samarium(II) iodide-promoted reductive dealkoxyhalogenahon of 6-desoxy-6-iodo-hexopyranosides such as 7-160 to produce a 6,e-unsaturated aldehyde which, after reductive cyclization, is trapped by an added electrophile to furnish the final product. In the presence of acetic anhydride, the four products 7-161 to 7-164 were obtained from 7-160. [Pg.523]


See other pages where Carbohydrate acetate production is mentioned: [Pg.49]    [Pg.179]    [Pg.40]    [Pg.26]    [Pg.225]    [Pg.506]    [Pg.220]    [Pg.296]    [Pg.40]    [Pg.417]    [Pg.90]    [Pg.112]    [Pg.322]    [Pg.144]    [Pg.112]    [Pg.322]    [Pg.267]    [Pg.685]    [Pg.66]    [Pg.94]    [Pg.155]    [Pg.285]    [Pg.304]    [Pg.331]    [Pg.172]    [Pg.585]    [Pg.181]    [Pg.181]    [Pg.3]    [Pg.143]    [Pg.370]    [Pg.42]    [Pg.284]    [Pg.188]    [Pg.318]    [Pg.54]    [Pg.163]    [Pg.149]    [Pg.150]    [Pg.247]    [Pg.174]    [Pg.23]    [Pg.25]   
See also in sourсe #XX -- [ Pg.84 ]




SEARCH



Acetate production

Acetates carbohydrates

Acetic acid carbohydrate fermentation product

Carbohydrates production

© 2024 chempedia.info