Amylose, reaction with

Carbonates, diaryl, reactions with cyclohepta-amylose, 23 240 Carbon dioxide adsorption, 21 44 on chromia, 20 27 on gallium-doped NiO, 22 247-251 on nickel catalysts, 22 87-96 dissociative, 22 93-96... 

The first surface-initiated enzymatic polymerization reported was the synthesis of amylose brushes on planar and spherical surfaces [145]. For this, silica or silicone surfaces were modified with self-assembled monolayers of (3 amino-propyl)trimethoxysilane or chlorodimethylsilane, respectively. To these functionalities, oligosaccharides were added via (a) reductive amidation of the oligosaccharides to surface-bound amines, (b) conversion of the oiigosaccharide to the according aldonic acid lactone and reaction with surface bound amines, and (c) incorporation... 

The great majority of experimental variants discussed for benzylation (see Sect. 2.1) has also been applied for the preparation of allyl ethers. Among them, the alkylation with allyl bromide and sodium hydride in a dipolar aprotic solvent is most frequently used for complete allylation. Reaction with the methylsulfinyl carbanion in DMSO to form an alkoxide, followed by the reaction with allyl bromide provides a convenient high-yield route to 2,3,6-tri-O-allyl-amylose [227], With the limited amount of reagent, 35% of methyl 2-0-allyl-3,6-dideoxy-a-D-xy/o-hexopyranoside was synthesized from the corresponding glycoside [228]. The 2-allyl ether was the major product (43 % yield) of the reaction of methyl 4,6-0-benzylidene-a-D-glucopyranoside with allyl bromide and 1.1 equiv. of sodium hydride in benzene [71]. 

Microbiological action in starch dispersions results in a drop in pH, loss of viscosity and the development of odor. Retrogradation may be accelerated by the drop in pH or especially if butanol, which complexes with amylose, is generated via starch fermentation. Sulfate-reducing bacteria will cause black deposits due to reaction with iron in the process water. For quality control, preservatives are added to starch slurry, cooked starch, surface size and coating color. 

Since several synthetic polymers also develop a blue color upon reaction with iodine, it is likely that they have a helical structure similar to that of amylose. Therefore it is probable that the aforementioned complexes of synthetic polymers with starch can exist in the form of a double helix. 

Pretreatment of the maize amylose with a-amylase gave a series of linear maltosaccharides which were only slightly (about 8%) degraded by phosphorylase, indicating that the enzyme had little afiinity for substrates of low molecular weight. However, with high concentrations of enzyme, a reaction with maltoheptaose has been observed, in which disproportionation occurred with the formation of a series of oligosaccharides of DP... 

AMYLOL (71-41-0) see pentanol. R-AMYLOSE (9004-34-6) (C4H10O5), Combustible solid. Fine dust can form explosive mixture with air (flash point 770°F/410°C Fire Rating 1). Violent reaction with strong oxidizers including bromine pentafluoride fluorine, hydrogen peroxide perchlorates, perchloric acid peroxides sodium hypochlorite sodium nitrate sodium nitrite zinc permanganate. On small fires, use HjO, foam, dry chemical, or CO2 extinguishers. Nitration with a... 

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