中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
D-纤维二糖 | cellobiose | 528-50-7 | C12H22O11 | 342.3 |
纤维素二糖 | Cellobiose | 16462-44-5 | C12H22O11 | 342.3 |
—— | Cellobiose | 13360-52-6 | C12H22O11 | 342.3 |
D-(+)-纤维二糖 | Maltose | 133-99-3 | C12H22O11 | 342.3 |
—— | Lactose | 63-42-3 | C12H22O11 | 342.3 |
—— | gentibiose | —— | C12H22O11 | 342.3 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
乳糖酸 | lactobionic acid | 96-82-2 | C12H22O12 | 358.299 |
A series of TiO2 supported Au–M (M = Cu, Co, Ru and Pd) bimetallic catalysts were tested for cellobiose oxidation. Cu–Au and Ru–Au provided excellent gluconic acid selectivity’s, although
The oxidation of D-lactose, D-maltose, D-melibiose, and D-cellobiose by CrVI yields the corresponding aldobionic acid and Cr3+ as final products when an excess of reducing disaccharide over CrVI is used. The rate law for the CrVI oxidation reaction is expressed by d[CrVI]/dt = kH [disaccharide][CrVI], where the second-order kinetic constant, kH, depends on [H+]. The relative reactivity of the disaccharides with CrVI is expressed as follows: Mel > Lac > Cel > Mal, at 33°C. In acid medium, intermediate CrV forms and reacts with the substrate faster than CrVI. The EPR spectra show that five- and six-coordinate oxo-CrV intermediates are formed, with the disaccharide acting as bidentate ligand. Five-coordinate oxo-CrV species are present at any [H+], whereas six-coordinate ones are observed only at pH < 2, where they rapidly decompose to the redox products. In the pH 37 range, where hexa-coordinate oxo-CrV species are not observed, CrV complexes are stable enough to remain in solution from several days to several months.Key words: chromium, saccharides, kinetics, EPR.