Non-reducing sugars

Citric acid concentration (%) pH Reducing sugars (%) Non-reducing sugars (%)... 

However, some microorganisms, the so-called anhydrobiotes, are able to deal better with a lack of water. One of their strategies for survival is the accumulation of non-reducing sugars (disaccharides) which replace the lost water during dry periods and can, for example, stabilise membrane structures, even when water is not present. 

An important question is how this system can work with sugar alcohols and non-reducing sugars. The oxidation is catalysed by the electrode surface, which means that the response is dependent on the electrode potential of the catalytic state rather than the redox potential. 

Non-reducing sugars may be hydrolysed by boiling with dilute hydrochloric acid if the solution is then neutralised with aqueous sodium hydroxide the reduction of Fehling s solution or Benedict s solution occurs readily. 

Yuasa H, Hindsgaul O, Palcic MM (2002) Chemical-enzymic synthesis of 5 -thio-N-acetyllactosamine the first disaccharide with sulfur in the ring of the non-reducing sugar. J Am Chem Soc 114 5891-5892... 

Yoda,104 after reacting non-reducing sugars and polyhydric alcohols with periodate, used a mixture of manganous sulfate and bis-(p-dimethyl-aminophenyl)methane in acetic acid to detect the spots sensitivity, 5 to 50 micrograms. 

Kline and Acree studied the hypoiodite oxidation extensively. The alkali and iodine were both added in small portions throughout the reaction. In this manner the concentration of sugar relative to the sodium hypoiodite was kept at a level favorable to the sugar oxidation (reaction 14). At the end of the reaction, the formation of iodate increased rapidly (reaction 15), taking precedence over the oxidation of ketoses and non-reducing sugars. 

The ketose and non-reducing sugars are not oxidized sufficiently to interfere with the precision of the method unless iodine and alkali are used in excess of the above amounts. Lignins and other compounds oxidized by iodine and alkali generally react differently than sugars and disturb the 2 3 ratio for iodine and alkali. 

Non-Reducing Sugar (Polyol) Monosaccharides of Commercial Importance. 848... 

Sucrose consists of two monosaccharides, glucose and fructose, joined by a glycosidic bond between carbon atom 1 of the glucose unit and carbon atom 2 of the fructose unit (O Fig. 3). Since it contains no free anomeric carbon atom (O Fig. i), it is a non-reducing sugar. Some basic chemical, physical, and physico-chemical properties of pure sucrose are listed in O Table 3. 

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