Proefschrift Universiteit Maastricht. / Auteursnaam op omslag: Bary Berghmans. Met bibliogr., lit. opg. - Met samenvatting in het Nederlands.

Proefschrift Universiteit Maastricht. / Met bibliogr., lit. opg. - Met een samenvatting in het Nederlands.

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abstract: Background: Twenty-four hour urinary sucrose and fructose (24uSF) has been developed as a dietary biomarker for total sugars intake. Collection of 24-h urine is associated with high costs and heavy participant burden, while collection of spot urine samples can be easily implemented in research protocols. The aim of this thesis is to investigate the utility of uSF biomarker measured in spot urine. Methods: 15 participants age 22 to 49 years completed a 15-day feeding study in which they consumed their usual diet under controlled conditions, and recorded the time each meal was consumed. Two nonconsecutive 24-hour urines, where each urine void was collected in a separate container, were collected. Four timed voids (morning, afternoon, evening, and next day) were identified based on time of void and meal time. Urine samples were measured for sucrose, fructose and creatinine. Variability of uSF excretion was assessed by coefficient of variation (%CV) and variance ratios. Pearson correlation coefficient and multiple linear regression were used to investigate the association between uSF in each timed void and corresponding 24uSF excretion. Results: The two-day mean uSF was 50.6 mg (SD=29.5) for the 24-h urine, and ranged from 4.5 to 7.5 mg/void for the timed voids. The afternoon void uSF had the lowest within-subject variability (49.1%), and lowest within- to between-subject variance ratio (0.2). The morning and afternoon void uSF had the strongest correlation with 24-h uSF for both mg/void (r=0.80 and r=0.72) and mg/creatinine (r=0.72 and r=0.67), respectively. Finally, the afternoon void uSF along with other covariates had the strongest predictive ability of 24-h uSF excretion (mg/void) (Adjusted R2= 0.69; p=0.002), whereas the morning void had the strongest predictive ability of 24-h uSF excretion (mg/g creatinine) (adjusted R2= 0.58; p=0.008). Conclusions: The afternoon void uSF had the most favorable reproducibility estimates, strong correlation with 24uSF excretion, and explained greatest proportion of the variability in 24uSF. USF in mg/void may be better to use than uSF in mg/g creatinine as a biomarker in spot urine. These findings need to be confirmed in a larger study, and in a study population with a wide range of sugars intake. / Dissertation/Thesis / Masters Thesis Nutrition 2018

Orientadora: Marileda Bonafim Carvalho / Banca: João Martins Pizauro Júnior / Banca: Márcia Mery Kogika / Resumo: Os glicosaminoglicanos (GAGs) são mucopolissacarídeos eliminados normalmente na urina. A alteração da excreção dessas substâncias está relacionada à ocorrência de doenças sistêmicas ou do trato urinário. Dentre elas, a cistite intersticial, cuja fisiopatogenia ainda não foi esclarecida, acomete seres humanos, e os felinos, por apresentarem quadro semelhante, têm sido considerados o melhor modelo para estudo desta doença. Considerando que os GAGs podem estar envolvidos nos mecanismos da enfermidade, é importante a padronização de métodos para dosagem destes mucopolissacarídeos em urina de felinos, bem como o estabelecimento de valores de referência para a espécie. Foram avaliados 12 felinos sadios, dos 30 aos 114 dias de idade. Amostras de urina foram coletadas a cada 28 dias para quantificação de GAGs sulfatados. Para as mensurações, foram avaliados quatro métodos colorimétricos em busca do mais sensível, barato e reprodutível. Dentre eles, o de desempenho melhor foi o que emprega azul de dimetilmetileno (DMB) em tampão acetato sódico, padrão com sulfato de condroitina C (SCC) após modificação do volume de urina empregado na reação, do tempo de leitura dos testes, além da dispensa da centrifugação das amostras de urina. A excreção urinária de GAG sulfatado não foi influenciada pelo sexo, mas foi modificada pelo fator idade. Os valores foram significativamente mais altos aos 30 e aos 58 dias de idade em relação aos observados para as idades subseqüentes (86 e 114 dias), revelando declínio das quantidades desta substância na urina de felinos desta faixa etária. / Abstract: Glycosaminoglycans (GAGs) are mucopolisacarides usually eliminated in urine. The altered excretion of these substances is related to occurrence of systemic or urinary diseases. Among them, interstitial cystitis, which physiopatogenesis has not been elucidated yet, is observed mainly in humans, and felines, that present similar signs, have been considered the best model for study of this illness. Considering that GAGs may be involved with disease mechanisms, the standardization of methods to measure mucopolissacarides in feline urine, as the establishment of reference values for the species, are very important. Twelve healthy kittens were studied, from 30 to 114 days old, and specimens of urine were collected every 28 days for quantification of GAGs. Four colorimetric methods were analyzed, in order to find the most sensible, cheap and reproducible for dosage. The selected method, that employs dimethylmethylene blue (DMB) with sodium acetate buffer and standard with chondroitin C sulfate, was modified with regard to the volume of urine employed, reading time of the tests, and dispense of urine centrifugation. Values were significantly higher at ages 30 and 58 days old when compared to those observed at subsequent ages (86 and 114 days), revealing decline of these substance quantities in feline urine on this age interval. / Mestre

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Made available in DSpace on 2014-10-09T12:50:27Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:58:47Z (GMT). No. of bitstreams: 1 00629.pdf: 698191 bytes, checksum: 13b6a1876cd1e8729bc9cd5ae7842ff2 (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Biociencias, Universidade de Sao Paulo - IB/USP

Made available in DSpace on 2014-10-09T12:32:32Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:08:58Z (GMT). No. of bitstreams: 1 03261.pdf: 2839312 bytes, checksum: fc6899707bcade3ddd16f989bb548c04 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP