Xylose and Xylitol

Demetrakopoulos, George Ev.; Amos, Harold

doi:10.1159/000401763

Cited by 24 publications

(2 citation statements)

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“…It is generally accepted that I>-glucose can be utilized almost completely in humans and animals (Demetrakopoulos & Amos, 1978), thus only negligible amounts of glucose will be found in the urine. The latter finding is confirmed in the present study.…”

Section: Discussionmentioning

confidence: 99%

Nutritional implications ofl-arabinose in pigs

et al. 1992

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The pentose sugar L-arabinose is one of the most abundant components released by complete hydrolysis of non-starch polysaccharides of feed ingredients of vegetable origin. Two studies were conducted to investigate the apparent ileal digestibility and urinary excretion of L-arabinose at dietary inclusion levels of 50 and 100 g/kg, and 25, 50, 75 and 100 g/kg respectively, in pigs. As a reference, D-glucose was included in the studies. Water intake, ileal flow of volatile fatty acids and ileal and faecal digestibilities of dietary nutrients in pigs fed on the different diets were also examined. Castrated pigs were prepared with a post-valvular T-caecum cannula to measure ileal digestibility. Faecal digestibility was measured in non-cannulated pigs. Apparent ileal digestibility of karabinose was found to be approximately 70 YO. The presence of L-arabinose in the diet increased ileal flow of volatile fatty acids and lactic acid, suggesting the occurrence of microbial degradation of L-arabinose in the pig small intestine. L-arabinose was partly excreted in the urine. The extent of this urinary excretion as a percentage of intake increased linearly (P < 0 01) as the dietary level increased. In pigs fed on the 25 g L-arabinosetkg diet, 10.9 YO of the L-arabinose consumed appeared in the urine. This level was increased to 14.7 % when pigs were fed on a diet containing 100 g L-arabinose/kg diet. Faecal digestibility and retention of nitrogen decreased significantly in pigs fed on the L-arabinose diets.

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Section: Discussionmentioning

confidence: 99%

Nutritional implications ofl-arabinose in pigs

et al. 1992

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“…xylose as the sole carbon source (Demetrakopoulos & Amos, 1976;Demetrakopoulos et al, 1977) were previously found to be derepressed for transport. In fact, in the experiments reported here, medium containing xylose induced higher rates of transport than were observed in cells maintained in the total absence of sugar.…”

Section: Discussionmentioning

confidence: 99%

Purines as ‘hyper-repressors’ of glucose transport. A role for phosphoribosyl diphosphate

Amos¹

1983

Biochemical Journal

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Under selected conditions the rate of glucose transport and the intracellular phosphoribosyl diphosphate (PPRibP) concentrations of chick-embryo fibroblasts are inversely correlated. This relationship holds when cells are incubated with mannose, fructose, xylose or various concentrations of glucose. The metabolic inhibitors 2,4-dinitrophenol, rotenone and Methylene Blue increased glucose transport and decreased PPRibP. The addition of any pyrimidine or purine base or ribonucleoside dramatically depleted PPRibP pools, regardless of the carbon source. Addition of guanine (10 microM) or hypoxanthine (100 microM) decreased transport in glucose-grown chick cells to barely detectable values, but did not affect increases observed in cells depressed by substitution of xylose for glucose. Guanosine, inosine and the purine analogues 6-thioguanine, 6-thioguanosine, 8-azaguanine and 6-methylmercaptopurine riboside sharply decreased transport in glucose-grown cells and blocked the increase in transport resulting from the replacement of glucose by fructose or xylose in the culture medium.

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Xylitol

and¹,

Dunning²

2006

Sweeteners and Sugar Alternatives in Food Technology

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Xylose and Xylitol

Cited by 24 publications

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Nutritional implications ofl-arabinose in pigs

Nutritional implications ofl-arabinose in pigs

Purines as ‘hyper-repressors’ of glucose transport. A role for phosphoribosyl diphosphate

Xylitol

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