K. Linek

Optical rotary dispersion studies. Correlation between the structure and o.r.d. curves of acyclic ketoses

Abstract The o.r.d. curves of some tetruloses and 2- and 3-pentuloses have been measured and a relation has been found between the structure of the ketoses and their Cotton effects.

Oxidation of Alditols by mercury(II) acetate

Abstract The secondary hydroxyl groups of d -arabinitol and xylitol were shown to undergo oxidation with a boiling, methanolic solution of mercury(II) acetate to give d - threo -pentulose, d - threo -3-pentulose, d - erythro -pentulose, and dl - threo -pentulose and erythro -3-pentulose, respectively. The formation of dihydroxyacetone and dl -glyceraldehyde from glycerol, and mainly glycolaldehyde from ethylene glycol, indicates that primary hydroxyl groups are also oxidised. These results, as well as the formation of acetone upon treatment of isopropyl alcohol with mercury(II) acetate, indicate that cyclic intermediates are not involved in these oxidations.

Antimicrobial effects of sugar osazones

Antimicrobial effects onMicrococcus luteus, Bacillus licheniformis andEscherichia coli were determined using a group of sixteen aldose osazones.

2-Deoxy-d-lyxo-hexonic Acid from 2-Deoxy-d-lyxo-hexose byPseudomonas aeruginosa Fermentation

Aerobic fermentation of media or solutions containing 2-deoxy-@#@d-lyxo- hexose and calcium carbonate by bacterial cells capable of oxidizing aldoses to aldonic acids was used to prepare 2-deoxy-d-- lyxo- hexonic acid; the acid was isolated in a 62 % yield in the form of its 1,4-lactone.

Biochemical dehydrogenations of saccharides. VII. 2-Deoxy-D-gluconic acid from 2-deoxy-D-glucose.

Fermentation of a medium containing 5% 2-deoxy-D-glucose and barium carbonate by a strain ofPseudomonas aeruginosa yielded barium 2-deoxy-d-gluconate. The yield was 77% theoretical. The strain in question makes it possible to prepare directly calcium, magnesium, manganese and ferrous salts of 2-deoxy-d-glueonic acid. A treatment of 6% solution of 2-deoxy-d-glucose with commercial glucose oxidase preparation caused also a complete dehydrogenation.