Glucose spectra study

FIGURE 31 -10 Cerebral amino acids and carbohydrates incorporate 13C label from infused glucose. The top panel shows a 13C NMR spectrum obtained from a gray-matter-rich volume in the human head. (From reference [141].) The right panel shows label incorporation into brain glycogen and glucose in humans. (From reference [142].) The stack plot illustrates the rate of label incorporation into many compounds and carbons in the rat brain. (From reference [ 143].) In all studies, glucose labeled at the 1 or 6 position was administered intravenously. 

The 3700-2700-cm-1 region is less easy to interpret than the region below 1700 cm-1. Nevertheless, comparative study of intensities of the C-H vibrations permitted differentiation of D-fructose from D-glucose and sucrose. It was found187 that the asymmetrical vibration pas(C-H) for CH2 in d-fructose is stronger than the symmetrical vibration the opposite was observed for D-glucose, and the spectrum of sucrose exhibits almost the same intensity for the two vibrations. This result (see Fig. 19), which could... 

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