A Qualitative and Quantitative Study of Sugar‐alcohols in Several Foods

Washüttl, J.; Riederer, Peter; Bancher, E.

doi:10.1111/j.1365-2621.1973.tb07257.x

Cited by 82 publications

(26 citation statements)

References 6 publications

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“…The latter is found among products of both myo-inositol and D-glucurono-6,3-lactone metabolism in plants (18)(19)(20) The animal-mediated pathway also includes xylitol as an intermediate (25). A report on the occurrence of xylitol in plant tissues has appeared (28). These authors report as much as 935 mg of xylitol/100 g (dry wt) in Italian plum fruits and 258 mg in endive leaves.…”

Section: Rosenfield Fann and Loewusmentioning

confidence: 95%

Metabolic Studies on Intermediates in the myo-Inositol Oxidation Pathway in Lilium longiflorum Pollen

Rosenfield¹,

Fann²,

Loewus³

1978

Plant Physiol.

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The myo-inositol oxidation pathway was investigated in regard to its role as a source of carbon for products of hexose monophosphate metabolism in germinated polen of Lilium longiflorum Thunb., cv. has been noted in other plant tissues including parsley leaves (20), strawberry fruits (20), corn seedlings (9), and lily pistils (12), but processes involved in this conversion have yet to be determined.Biosynthesis of myo-inositol involves direct cyclization of Dglucose-6-P to L-myo-inositol-1-P. Conversion of myo-inositol to glucose by reversal of this reaction would require formation of L-myo-inositol-1-P. Formation of myo-inositol-1-P from myoinositol was found in detached corn root tips by J. Dehusses (see ref. 16) and the kinase for this reaction has been described (7) but conversion of L-myo-inositol-1-P to D-glucose-6-P by reversal of myo-inositol-1-P synthase could not be demonstrated (21).Alternatively, conversion of myo-inositol to glucose could occur after oxidative cleavage of myo-inositol to glucuronate. Indeed, when D_[1-14C]glucurono-6,3-lactone was fed to detached strawberry fruits, significant 14C was recovered in sucrose and xylose (8). Free -xylose was readily converted to sucrose in the strawberry (17). Animals also convert myo-inositol to hexose over a pathway known as the glucuronate-xylulose cycle (25) which involves reduction of D-glucuronic acid to L-gulonic acid. Although plant tissues also reduced D-glucuronate and its lactone to L-gulonic acid (8,18,20), L-gulonic acid merely accumulated. When L-[1-14C]-or L-[6-14C]gulono-1,4-lactone was fed to detached strawberry fruits or bean apices, a portion was hydrolyzed to L-gulonic acid but none of the label was found in polysaccharide fractions (2). It seems unlikely that the glucuronate-xylulose cycle plays a role in the conversion of myo-inositol to hexose in plants.The present paper examines the metabolic fate of specifically labeled carbohydrates peculiar to the myo-inositol oxidation pathway and to -glucuronate metabolism. Results MATERIALS AND METHODSPollen. Anthers of Lilium longiflorum Thumb., cv. Ace (Easter lily) were collected in a commercial greenhouse on the day of anthesis. Anthers were dried in an open, well ventilated area and shaken on 20-mesh screen to recover the pollen which was stored at 4 C as described earlier (4). Two batches collected in March, 1972 were used in these experiments. Batch A with 50 ± 4% germination was used for uptake studies and batch B with 75 + 5% for isolation of labeled products.Uptake of myo-inositol was delayed by the time required for 89 www.plantphysiol.org on May 9, 2018 -Published by Downloaded from

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Section: Rosenfield Fann and Loewusmentioning

confidence: 95%

Metabolic Studies on Intermediates in the myo-Inositol Oxidation Pathway in Lilium longiflorum Pollen

Rosenfield¹,

Fann²,

Loewus³

1978

Plant Physiol.

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“…The metabolic significance of this in apple tissue deserves further study since there is only one report on the presence of xylitol in higher plants (24), and these results have been questioned (22).…”

Section: Compound Addedmentioning

confidence: 99%

“…Sorbitol (D-glucitol) is an alditol distributed widely in plants (14,24). It is found mainly in the Rosaceae where it occurs in all genera of the tribes Spiraeoideae, Pomoideae, and Prunoideae (19), and it is common in many fruits (26).…”

mentioning

confidence: 99%

Detection and Characterization of Sorbitol Dehydrogenase from Apple Callus Tissue

Negm¹,

Loescher²

1979

Plant Physiol.

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“…Most fruits, berries, and plants contain xylitol [1]. Considerable amounts of xylitol also occur as an intermediate of the mammalian carbohydrate metabolism.…”

Section: Introductionmentioning

confidence: 99%

Increased Bone Volume and Bone Mineral Content in Xylitol-Fed Aged Rats

Mattila

Svanberg²,

Knuuttila³

2001

Gerontology

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Background: Our previous studies have shown that dietary xylitol supplementation protects against the loss of bone mineral after ovariectomy. The ovariectomy-induced decrease in trabecular bone volume is significantly retarded by dietary xylitol. Objective: To study whether dietary xylitol can protect against bone loss also during aging, a long-term experimental study was performed with rats. Methods: Twenty-four male Sprague-Dawley rats were divided into two groups. The rats in the control group were fed a basal RM1 diet, while the rats in the experimental group were continuously fed the same diet supplemented with 10% (w/w) xylitol. The rats were killed after 20 months. Their tibiae were used for the analyses of bone density and trabecular bone volume, and their femurs were used for the scanning analyses with peripheral quantitative computed tomography (pQCT). Results: The tibial density of the xylitol-fed aged group (1.73 ± 0.14 g/mm³) was significantly greater than that of the aged group without xylitol (1.56 ± 0.14 g/ mm³). The trabecular bone volume of the xylitol-fed rats was 21.2 ± 4.0%. It was significantly greater than that of the rats not receiving xylitol (9.3 ± 4.3%). The pQCT-measured cortical bone mineral density and the pQTC-measured cortical bone mineral content of the femoral diaphysis were significantly greater in the xylitol-fed group than in the control group. The trabecular bone mineral density and the trabecular bone mineral content of the femoral distal metaphysis were also significantly greater in the xylitol-fed group than in the non-xylitol group. The total bone mineral density and the total bone mineral content of the femoral neck in the xylitol-fed aged group significantly exceeded those in the aged group without xylitol supplementation. Conclusions: A continuous moderate dietary xylitol supplementation leads to increased bone volume and increased bone mineral content in the long bones of aged rats. This indicates a xylitol-induced protection against aging-related osteoporotic changes.

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A Qualitative and Quantitative Study of Sugar‐alcohols in Several Foods

Cited by 82 publications

References 6 publications

Metabolic Studies on Intermediates in the myo-Inositol Oxidation Pathway in Lilium longiflorum Pollen

Metabolic Studies on Intermediates in the myo-Inositol Oxidation Pathway in Lilium longiflorum Pollen

Detection and Characterization of Sorbitol Dehydrogenase from Apple Callus Tissue

Increased Bone Volume and Bone Mineral Content in Xylitol-Fed Aged Rats

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