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  • 1
    Publication Date: 1998-12-01
    Print ISSN: 0044-264X
    Electronic ISSN: 1435-1293
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Published by Springer
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  • 2
    Publication Date: 1997-09-01
    Print ISSN: 0044-264X
    Electronic ISSN: 1435-1293
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Published by Springer
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  • 3
    Publication Date: 2000-06-19
    Print ISSN: 0031-6970
    Electronic ISSN: 1432-1041
    Topics: Chemistry and Pharmacology , Medicine
    Published by Springer
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  • 4
    Publication Date: 1981-06-01
    Print ISSN: 0044-264X
    Electronic ISSN: 1435-1293
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Published by Springer
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Chromatography A 463 (1989), S. 207-211 
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 6
    ISSN: 1432-1041
    Keywords: Key words Thiamine diphosphate ; Transketolase ; Benfotiamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: The influence of either orally administered S-benzoylthiamine-O-monophosphate (benfotiamine) or thiamine nitrate on the thiamine status was tested in a randomised, two-group comparison study in 20 end-stage renal disease (ESRD) patients. Main outcome measures were the pharmacokinetics of thiamine diphosphate (TDP) in blood, the in vitro erythrocyte transketolase activity, its activation coefficient (α-ETK) and the TDP concentration in erythrocytes. Methods: After ingestion of a single dose of either 100 mg thiamine nitrate (corresponding to 305 μmol thiamine) or 100 mg benfotiamine (corresponding to 214 μmol thiamine), the blood levels of thiamine phosphate esters were analysed by means of high-performance liquid chromatography for a 24-h period. The TDP concentration in erythrocytes was calculated using the haematocrit and TDP concentration in blood. Erythrocyte transketolase activity and α-ETK were measured before and 10 h after administration. The pharmacokinetics of TDP in blood were compared with healthy subjects of other studies retrieved from database query. Results: Regarding the blood concentrations of TDP, the patients with ESRD had a 4.3 times higher area under the concentration–time curve after benfotiamine administration than after thiamine nitrate. After benfotiamine administration, the peak plasma concentration of TDP exceeded that in healthy subjects by 51%. In the ESRD patients, after 24 h, the mean TDP concentration in erythrocytes increased from 158.7 ± 30.9 ng/ml initially to 325.8 ± 50.9 ng/ml after administration of benfotiamine and from 166.2 ± 51.9 ng/ml to 200.5 ± 50.0 ng/ml after thiamine nitrate administration. The ratio between the maximum erythrocyte TDP concentration and basal concentration was 2.66 ± 0.6 in the benfotiamine group and 1.44 ± 0.2 in the group receiving thiamine nitrate (P 〈 0.001). After 24 h, it was 2.11 ± 0.4 and 1.23 ± 0.2, respectively. The transketolase activity increased from 3.54 ± 0.7 μkat/l initially to 3.84 ± 0.6 μkat/l after benfotiamine intake (P=0.02) and from 3.71 ± 0.8 μkat/l to 4.02 ± 0.7 μkat/l after thiamine nitrate intake (P=0.08). Likewise, α-ETK decreased from initially 1.10 ± 0.07 to 1.04 ± 0.04 (P=0.04) and from 1.12 ± 0.05 to 1.08 ± 0.06 (P=0.09). After 24 h, the phosphorylation ratio in whole blood decreased from 12.9 ± 6.9 initially to 5.6 ± 3.2 after benfotiamine administration (P=0.02) and from 13.5 ± 7.3 to 9.0 ± 4.8 (P=0.03) after administration of thiamine nitrate. No correlation between erythrocyte TDP concentration and transketolase activity and/or α-ETK was observed in ESRD patients, either before or 10 h after administration. Conclusion: Compared with thiamine nitrate, the oral administration of benfotiamine leads to higher TDP concentrations in erythrocytes accompanied with a significant improvement of the erythrocyte transketolase activity in ESRD patients.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 20 (1981), S. 156-161 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 8
    ISSN: 1436-6215
    Keywords: Frauenmilich ; Thiamin ; Riboflavin ; Vitamin A ; Vitamin E ; Human milk ; thiamine ; riboflavin ; vitamin A ; vitamin E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The contents of the vitamins B1 (27 ng/ml), B2 (57 ng/ml), A (1.3 µg/ml), and E (9.7 µg/ml) as well as β-carotene (0.2 µg/ml) in transitional human milk were determined for up to 35 women aged between 19 and 31 years. Additionally, the vitamin content in maternal and cord plasma as well as the erythrocytic transketolase- and glutathion-reductase activities of the water soluble vitamins were measured. Dietary recalls were evaluated for the nutritional intake of vitamins. Concerning the fat soluble vitamins, the breast fed newborns received the recommended amounts of the German Society of Nutrition (DGE) for this group. In contrast to this, the supply of the water soluble vitamins (B1: 13.5 µg/500 ml; B2: 28.5 µg/500 ml) attained only 5 to 10 % of the recommendations for newborns during the first two weeks after parturition with breast feeding. Vitamin content of maternal plasma (B1: 6.1±2.8 ng/ml) and erythrocytic enzyme activities (αETK: 0.86–1.62; αEGR: 1.08–1.75) indicated a low or sufficient intake, while the values in cord blood (B1: 19.8±6.5 ng/ml; αETK: 0.62–1.62; αEGR: 1.01–1.47) were in accordance with a satisfactory supply.
    Notes: Zusammenfassung Die Gehalte der transitorischen Frauenmilch an den Vitaminen B1 (27 ng/ml), B2 (57 ng/ml), A (1,3 µg/ml) und E (9,7 µg/ml) sowie β-Carotin (0,2 µg/ml) wurden bei bis zu 35 Frauen im Alter zwischen 19 und 31 Jahren untersucht. Zusätzlich wurden die Vitamingehalte im Plasma der Wöchnerinnen und in der Nabelschnur nach der Geburt sowie bei den wasserlöslichen Vitaminen die Aktivitäten der Transketolase und der Glutathion-Reduktase in den Erythrozyten ermittelt. Ernährungsprotokolle lieferten einen Überblick über die Vitaminzufuhr. Bei den fettlöslichen Vitaminen erhielten die Säuglinge beim Stillen die von der DGE empfohlene Menge, während die Empfehlungen zur Zufuhr wasserlöslicher Vitamine in den ersten beiden Stillwochen mit einer Aufnahme von 13,5 µg/500 ml (B1) und 28,5 µg/500 ml (B2) nur zu 5–10 % erreicht wurden. Plasmaspiegel (B1: 6,1±2,8 ng/ml) und erythrozytäre Enzymaktivitäten (αETK: 0,86–1,62; αEGR: 1,08–1,75) der Wöchnerinnen wiesen eine unzureichende bis adäquate Versorgung aus, während die Werte im Nabelschnurblut (B1: 19,8±6,5 ng/ml; αETK: 0,62–1,62; αEGR: 1,01–1,47) eine gute bis befriedigende Versorgung der Säuglinge belegten.
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  • 9
    ISSN: 0044-264X
    Keywords: Key words Biotin – chronic renal failure – hemodialysis – Biotin supplementation – Biotin concentration in plasma and urine ; Schlüsselwörter Biotin – chronische Niereninsuffizienz – Hämodialyse – Biotinsubstitution – Biotinkonzentration im Plasma und im Urin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Bei 23 Patienten mit chronischer Niereninsuffizienz (CRF), 23 Dialysepatienten (DP), 22 Patienten nach Nierentransplantation (RT) und 40 Normalpersonen (NP) wurden die Biotin-Plasmaspiegel und die renale Ausscheidung über 24 Stunden gemessen und in Beziehung zur täglichen Biotinaufnahme mit der Nahrung gesetzt. Unsupplementierte DP zeigten niedrigere tägliche Biotinaufnahmen, als Patienten mit CRF, nach RT und als NP. Von der täglichen Biotinaufnahme schieden DP nur 1,6%–6,3% im Vergleich zu 39,7% bei den NP, 27,6% bei Patienten mit CRF und 24,3% bei RT mit dem Urin aus. Biotinsupplementierte DP wiesen 6fach und DP ohne zusätzliche Biotinzufuhr 4fach erhöhte Biotin-Plasmakonzentrationen gegenüber den NP auf. Während der Hämodialyse fiel die Biotin-Plasmakonzentration unter Biotinsubstitution um 30% und ohne Biotinsubstitution um 33% ab, alle Probanden erreichten nach 44 Stunden wieder die Ausgangsbiotinkonzentration. Männliche DP zeigten unabhängig von der Höhe der Supplementierung (30 μg oder 300 μg Biotin) vor der HD höhere Biotinkonzentrationen im Plasma. Zwischen der Biotinkonzentration und der renalen Grunderkrankung, dem Serumkreatinin sowie der Dauer, Frequenz der Dialysebehandlung, den verwendeten Dialysatoren (low-, high flux) und der Blutflußrate (QB 180–260 vs 270–280 vs 300 ml/min) während der HD ließ sich kein Zusammenhang darstellen. Ebenso hatte das Alter der Patienten, der BMI und Nikotinabusus sowie die Alkoholaufnahme keinen Einfluß auf die Höhe der Biotin-Plasmakonzentration. Aus diesen Ergebnissen ist zu schlußfolgern, daß eine regelmäßige Biotinsubstitution bei Patienten mit chronischer Niereninsuffizienz nicht notwendig ist.
    Notes: Summary In 23 patients with chronic renal failure (CRF), 23 patients on chronic intermittent hemodialysis treatment (DP), 22 patients after renal transplantation (RT) and 40 normal persons (NP), Biotin plasma levels and the urinary excretion were analysed and compared to the dietary Biotin intake. Unsupplemented DP had lower intake of Biotin than the CRF, RT, NP and DP with supplementation. DP excreted only 1.6–6.3% of the daily intake as compared to 39.7% in NP, 27.6% in CRF and 24.3% in RT. In unsupplemented DP patients, Biotin plasma levels were elevated by 4 times and in supplemented patients by 6 times compared to NP. During hemodialysis treatment, the Biotin plasma level dropped by about 30% in DP with and by 33% in DP without vitamine supplementation. However, after 44 hours, the initial concentration was reached again in those receiving vitamine supplementation (99% of basal level) and in DP without substitution (97% of basal level). Only in male DP significantly higher Biotin plasma levels before HD were detected irrespective of the supplementation dose as compared to female patients (30 μg and 300 μg Biotin after each dialysis session). Biotin plasma concentration did not vary with respect to the underlying renal disease, the serum creatinine concentration and the length and frequency of dialysis treatment, including the type of dialyzer (low- vs high flux) used and the blood flow rate (QB 180–260 vs 270–280 vs 300 ml/min). There were no major effects of the age of the patients (〈60 years vs 〉60 years), the BMI, nicotine abuse, or alcohol intake on Biotin blood concentration. Our results showed normal Biotin plasma levels which reflect a normal functional status and exclude a functional deficit, therefore there is no reason for a regular Biotin supplementation in patients with chronic renal failure.
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  • 10
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    Deutsche Akademie der Naturforscher Leopoldina, acatech – Deutsche Akademie der Technikwissenschaften Berlin-Brandenburgische, Akademie der Wissenschaften
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/report
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