| Autor: |
Piszczek, L., Gieŀdon, K., Wojtkowiak, Sz. |
| Zdroj: |
Journal of Applied Electrochemistry; November 1992, Vol. 22 Issue: 11 p1055-1059, 5p |
| Abstrakt: |
Electrochemical reduction of ribose and xylose has been studied in sodium sulphate solution and in phosphate buffers on amalgamated lead cathodes under conditions of galvanostatic electrolysis. The products after peracetylation were determined by gas chromatography. Over the catholyte pH range 8–11 high yields of the pentitols were obtained (84 and 75% for ribose and xylose, respectively). Regardless of the pH, 2-deoxypentitols were also formed in low yields (a few percent). Raising the temperature of the reaction to 45°C intensified the reduction 2 to 3 fold and, with xylose, the yield of xylitol was markedly increased. Large differences were observed between pH readings in the bulk solution and at the cathode. In unbuffered solutions these differences enhanced the rate of reduction of the pentoses autocatalytically. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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