Maltose structure

See maltose structure (p. 618) invert OH and H on carbon atom at lower right... 

Figure 10. Relaxed (adiabatic) conformational energy map for p-maltose as computed by Brady and coworkers.i3 Contours are drawn at 2,4,6, 8, and 10 kcal/mol above the minimum near < ), y = -60°, -40°. The p-maltose structure may be derived from that of p-cellobiose in Fig. 1 by inversion of the stereochemical configuration at Cl.

Chemical proof was given of the presence of the maltose structure in starch the high proportions of end groups in starch and glycogen, indicating highly ramified structures, were established, and later on attention was directed to methods for the separation of the amylose and amylopectin components of starches and to enzymatic transformations... 

Both maltose structures correspond to two energy minima, available thanks to intramolecular hydrogen bonds. Two hydrogen bonds might stabilize the sucrose molecule, provided the fructosyl moiety takes the furanosyl structure. Indeed, such possibility is employed in nature. 

The two stereoisomeric forms of maltose just mentioned indergo mutarotation when dissolved in water What is the structure of the key intermediate in this process ... 

Despite the similarities of their structures, cellobiose and maltose have dramatically different biological properties. Cellobiose can t be digested by humans and can t be fermented by yeast. Maltose, however, is digested without difficulty and is fermented readily. 

Maltose, l- 4- -link in, 998 molecular model of, 998 mutarotation of, 998 structure of, 998 Manicone, synthesis of. 805 Mannich reaction. 915 Mannose, biosynthesis of, 1011 chair conformation of, 126 configuration of, 982 molecular model of, 126 Margarine, manufacture of, 1063 Markovnikov. Vladimir Vassilyevich. 192... 

The structure of maltose (far right). A glycosidic bond links different ring carbon atoms of two glucose molecules. ... 

The living character of the ROMP promoted by the initiator Ru(CHPh)(Cl)2 (PCy3)2 (Cy = cyclohexane) was tested with the synthesis of diblock, triblock, and tetrablock copolymers of norbornene derivatives carrying acetyl-protected glucose, [2,3,4,6-tetra-O-acetyl-glucos-l-O-yl 5-norbornene-2-carboxylate], A or maltose groups, [2,3,6,2/,3/,4/,6/-hepta-0-acetyl-maltos-1-O-yl 5-norbornene-2-carboxylate], B, shown in Scheme 41 [102]. The AB, ABA, and ABAB structures were prepared by sequential addition of monomers with narrow molecular weight distributions to quantitative conversions. 

In41 the foregoing proof of the structure of turanose, the generally accepted structure of maltose which has come from the evidence supplied... 

It has been assumed in the preceding section that the phenylosazones of turanose, maltose, and D-glucosyl-D-arabinose have structures like that of D-glucose pjienylosazone. This normal osazone structure is now proved40 by the following data for the turanose and maltose osazones, and there can be little doubt that it also holds for the osazone of d-glucosyl-D-arabinose. Turanose phenylosazone has been converted by... 

One notices that the data from the oxidation of melezitose by per-iodic acid confirm the pyranose structure of the D-glucose unit in turanose, and therefore also in the case of maltose, in agreement with the original assignments for both of these disaccharides from methylation studies. 

M. Dols, M. Remaud-Simeon, R. M. Willemot, M. Vignon, and P. Monsan, Structural characterization of the maltose acceptor products synthesized by Leuconostoc mesenteroides NRRL B-1299 dextransucrase, Carbohydr. Res., 305 (1998) 549-559. 

---