Maltose monohydrate

Maltose Monohydrate, NRC, Catalog No. M-105, Pfanstiehl Laboratories, Inc., Waukegan, IU., 1981. 

C12H22011 H20 4-0-a-D-Glucopyranosyl-/3-D-glucopyranose, monohydrate (/1-maltose, monohydrate) M ALTOS 10, 11 30 38 453 449... 

A remarkable inertness towards acylation is shown by the secondary hydroxyl group on C-3 in maltose, lactose, and their methyl j8-glycosides. Benzoylation of maltose with 10 molar equivalents of the acid chloride in pyridine gave122 the octabenzoate and the l,2,6,2, 3, 4, 6 -hepta-0-benzoyl derivative in the ratio of 5 6, and treatment of /3-maltose monohydrate with 8.8 molar equivalents of acetyl chloride in pyridine-toluene at 0° gave123 the 1,2,6,2, 3, 4, 6 -heptaacetate and the octaacetate in the ratio of 27 10. Under similar conditions of benzoylation, cellobiose was converted into its oc-... 

Figure 3. Schematic diagram of the hydrogen-bond structure of p-maltose monohydrate (MALTOS11). The anrows indicate infinite chains. Distances and angles are from the neutron diffraction analysis.

A neutron-diffraction study of /3-maltose monohydrate provided a more defined description of the hydrogen bonding present in the molecule.16 With the exception of the intramolecular bond, 0-2 -H------------... 

Standard Solutions Dissolve accurately weighed quantities of USP Sorbitol, USP Dextrose, USP Maltitol, and high-purity maltose monohydrate (Sigma, or equivalent, and previously dried at 105° to constant weight) in sufficient Mobile Phase to obtain solutions having concentrations of 0.1% (w/ v) for each. 

Fig. 2.6 a, b. Hydrogen-bond connectivity diagram for maltose monohydrate, a Projection of a section of the crystal structure b schematic connectivity diagram... 

Hydrogen bonding in maltose, maltose monohydrate, and methyl maltoside provide models for that in the amyloses. Again the disaccharides are used as... 

Intramolecular hydrogen bonding stabilizes the macrocycle. As in a-maltose and in -maltose monohydrate, the separation of the 0(2)H and 0(3)H groups on adjacent glucose residues in the cyclodextrin molecules is such that intramolecular interglucose hydrogen bonds can be formed. 

The cooperative, infinite chains and cycles formed by O-H 0 hydrogen bonds in the a-cyclodextrin hydrates are a characteristic structural motif [109]. As with the simpler carbohydrate crystal structures described in Part II, Chapter 13, the hydrogen bonds can be traced from donor to acceptor in the cyclodextrin hydrate crystal structures. Networks of O-H 0-H 0-H interactions are observed in which the distribution of hydrogen bonds follows patterns with two characteristic motifs. One are the "infinite chains which run through the whole crystal lattice, and the others are the loops or cyclically closed patterns (a special case of the "infinite chains). As in the small molecule hydrates, such as a-maltose monohydrate, the chains and cycles are interconnected at the water molecules to form the complex three-dimensional networks illustrated schematically in Fig. 18.5, with some sections shown in more detail in Fig. 18.7 a, b, c. 

MALTOSIO. /9-Maltose monohydrate (C,2H22011, H20). Quigley GJ, Sarko A, Marchessault RH (1970) J Am Chem Soc 92 5834... 

MALTOS11. /9-Maltose monohydrate (neutron study) (C12H22On, H20). Gress ME, Jeffrey GA (1977) Acta Crystallogr, Sect B 33 2490... 

Melezitose, rafBnose pentahydrate, gentiobiose, D-glycero-D-gulo-heptose Sucrose, maltose monohydrate, cellobiose, n-glucitol (sorbitol)... 

To prepare 0.1 M test solutions dissolve the following amounts of substance in 100 mL of water each D-glucose monohydrate, 1.98 g fructose, 1.80 g a-lactose monohydrate, 3.60 g maltose monohydrate, 3.60 g sucrose, 3.42 g 1-butanol, 0.72 g. 

Maltose monohydrate is prepared by the enzymatic degradation of starch. 

Figure 16. Variation of the glass transition temperature, Tg, against weight % composition for spray-dried, low moisture powders prepared from aqueous solution blends of Lodex 10 and a low MW, glass-forming food ingredient, such as citric acid, mannose, or maltose monohydrate.

D Glucopyranosyl-D-glucitol, 45B, 470 Sophorose monohydrate, 44B, 403 Isomaltulose, 39B, 310 a-Lactose monohydrate, 37B, 244 a-Melibiose monohydrate, 42B, 323 a,p-Melibiose monohydrate, 44B, 403 -Maltose monohydrate, 35B, 266 43B, 546 2H26BrNaO,3, Sucrose-sodium bromide dihydrate, 11, 624 2H26O4S3, 2-S-Ethyl-2-thio-D-mannose diethyl dithioacetal, 40B,... 

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