| 1. |
- Arkbåge, Karin, et al.
(author)
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Bioaccessibility of folic acid and (6S)-5-methyltetrahydrofolate decreases after the addition of folate-binding protein to yogurt as studied in a dynamic in vitro gastrointestinal model.
- 2003
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In: Journal of Nutrition. - 0022-3166 .- 1541-6100. ; 133:11, s. 3678-3683
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Journal article (peer-reviewed)abstract
- Milk products are only moderate sources of folate. Nevertheless, they are of interest due to their content of folate-binding proteins (FBP), which in some studies have been reported to increase folate bioavailability. The effect of FBP on folate bioavailability has been widely discussed. The aim of this study was to investigate the bioaccessibility of folic acid and (6S)-5-methyltetrahydrofolate (5-CH3-H4folate) from fortified yogurt using a dynamic in vitro gastrointestinal model (TIM). In addition, the effect of FBP on folate bioaccessibility and the stability of FBP added to yogurt during gastrointestinal passage were investigated. Folate bioaccessibility was 82% from yogurt fortified with folic acid and 5-CH3-H4folate. The addition of FBP to yogurt decreased (P < 0.05) folate bioaccessibility. The lowering effect of FBP was more pronounced in yogurt fortified with folic acid (34% folate bioaccessibility) than from yogurt fortified with 5-CH3-H4folate (57% folate bioaccessibility). After gastrointestinal passage, 17% of the FBP in yogurt fortified with 5-CH3-H4folate and 34% of the FBP in yogurt fortified with folic acid were recovered. No difference in folate bioaccessibility was found between folate-fortified yogurt and folate-fortified pasteurized milk (P = 0.10), whereas the lowering effect of FBP was (P < 0.05) greater in yogurt compared with pasteurized milk. In conclusion, based on the high bioaccessibility of folic acid and 5-CH3-H4folate, yogurt without active FBP can be considered to be an appropriate food matrix for folate fortification.
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| 2. |
- Arkbåge, Karin, et al.
(author)
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Retention of vitamin B-12 during manufacture of six fermented dairy products using a validated radio protein-binding assay
- 2003
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In: International Dairy Journal. - 0958-6946 .- 1879-0143. ; 13:2-3, s. 101-109
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Journal article (peer-reviewed)abstract
- The aim of this work was to study vitamin B-12 retention during manufacture of six fermented dairy products. Careful validation of a commercial radio protein-binding kit showed this assay to be suitable after optimisation of sample pre-treatment and control of the kit for possible matrix effects. In fermented milks, vitamin B-12 concentrations decreased by 40-60%, compared with the starting milk, during storage of the final product at 4degreesC for 14 days, most likely attributed to consumption by starter cultures. In cottage cheese, hard cheeses and blue cheese, 18-56% of the vitamin B-12 originally present in the milk was retained. Removal of the whey fraction was the dominant factor reducing vitamin B-12 retention in cheeses, while the fermentation by starter cultures hardly affected vitamin B-12 concentrations.
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| 3. |
- Augustin, K, et al.
(author)
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Green tea extracts lower serum folates in rats at very high dietary concentrations only and do not affect plasma folates in a human pilot study.
- 2009
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In: Journal of Physiology and Pharmacology. - 0867-5910 .- 1899-1505. ; 60:3, s. 103-108
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Journal article (peer-reviewed)abstract
- Green tea catechins (GTC) have been shown to inhibit the activities of enzymes involved in folate uptake. Hence, regular green tea drinkers may be at risk of impaired folate status. The present experiments aimed at studying the impact of dietary GTC on folate concentrations and metabolism. In a human pilot study (parallel design) healthy men consumed for 3 weeks 6 capsules (approximately 670 mg GTC) per day (2 capsules with each principal meal) containing aqueous extracts of the leaves of Camellia sinensis (n=17) or placebo (n=16). No differences in plasma folate concentrations were observed between treatments. We further fed groups of 10 male rats diets fortified with 0, 0.05, 0.5, 1, or 5 g GTC/kg for 6 weeks. Only at the highest intake, GTC significantly decreased serum 5-methyl-tetrahydrofolate concentrations in rats, while mRNA concentrations of reduced folate carrier, proton-coupled folate transporter/heme carrier protein 1, and dihydrofolate reductase (DHFR) remained unchanged in intestinal mucosa. Using an in vitro enzyme activity assay, we observed a time- and dose-dependent inhibition of DHFR activity by epigallocatechin gallate and a green tea extract. Our data suggest that regular green tea consumption is unlikely to impair folate status in healthy males, despite the DHFR inhibitory activity of GTC.
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| 4. |
- Bouckaert, Kimberley P, et al.
(author)
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Critical evaluation of folate data in European and international databases : recommendations for standardization in international nutritional studies.
- 2011
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In: Molecular Nutrition & Food Research. - : Wiley. - 1613-4125 .- 1613-4133. ; 55:1, s. 166-180
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Journal article (peer-reviewed)abstract
- SCOPE: The objective was to perform an inventory and critical evaluation of folate data in selected European and international databases. The ultimate aim was to establish guidelines for compiling standardized folate databases for international nutritional studies.METHODS AND RESULTS: An ad hoc questionnaire was prepared to critically compare and evaluate folate data completeness, quantification, terminologies, and documentation of 18 European and international databases, and national fortification regulations. Selected countries participated in the European Prospective Investigation into Nutrition and Cancer project and European Food Information Resource Network (EuroFIR). Folate completeness was generally high. "Total folate" was the most common terminology and microbiological assay was the most frequently reported quantification method. There is a lack of comparability within and between databases due to a lack of value documentation, the use of generic or non-appropriate terminologies, folate value conversions, and/or lack of identification of synthetic folic acid.CONCLUSION: Full value documentation and the use of EuroFIR component identifiers and/or INFOODS tagnames for total folate ("FOL") and synthetic folic acid ("FOLAC"), with the additional use of individual folates, will increase comparability between databases. For now, the standardized microbiological assay for total folate and HPLC for synthetic folic acid are the recommended quantification methods.
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| 5. |
- Büttner, Barbara E, et al.
(author)
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Effect of type of heat treatment of breastmilk on folate content and pattern.
- 2014
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In: Breastfeeding Medicine. - : Mary Ann Liebert Inc. - 1556-8253 .- 1556-8342. ; 9:2, s. 86-91
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Journal article (peer-reviewed)abstract
- BACKGROUND: Breastmilk is the recommended aliment for preterm infants. Milk banks provide donated breastmilk for the neonatal care of preterm infants when mother's own milk is not is available. To avoid pathogen transmission, donated breastmilk is heat-treated according to different procedures before administration. There is varying information on the effect of heat treatment on folate in breastmilk. Sufficient folate intake, however, is essential for normal growth and brain development. This study determined and compared the effects of different heat treatments on breastmilk folate content and pattern of individual folate forms.MATERIALS AND METHODS: Donated Swedish breastmilk samples were heat-treated according to three procedures: two low temperature treatments (57°C, 23 minutes; 62.5°C, 12 minutes) and a rapid high temperature treatment (heating to 73°C in boiling water). The folate content and pattern were determined before and after treatment by high-performance liquid chromatography.RESULTS: The folate content in 38 untreated Swedish breastmilk samples was 150±46 nmol/L. Two different folate vitamers were detected: 5-methyltetrahydrofolate (78±7%) and tetrahydrofolate (22±7%). Heat treatment affected only tetrahydrofolate stability and decreased folate content by 15-24%; however, the effects on folate content did not differ among the investigated heat treatment procedures.CONCLUSIONS: Folate losses during heat treatment of human milk were considered acceptable. Yet, native folate content of heat-treated, non-fortified breastmilk supplied only 25% of the recommended daily intake for preterm infants.
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| 6. |
- Büttner, Barbara E, et al.
(author)
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Quantification of isotope-labeled and unlabeled folates and folate catabolites in urine samples by stable isotope dilution assay.
- 2013
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In: International Journal for Vitamin and Nutrition Research. - : Hogrefe Publishing Group. - 0300-9831 .- 1664-2821. ; 83:2, s. 112-121
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Journal article (peer-reviewed)abstract
- Dual-label stable isotope dilution assays for the simultaneous quantification of isotopologic folates in clinical samples offer the perspective for differentiating between unlabeled folates from endogenous body pools and administered [13C5]-labeled folates from a test dose when performing bioavailability trials. In contrast to intact folates, this methodology could hitherto not be applied to the quantification of the folate catabolites, p-aminobenzoyl glutamate and p-acetamidobenzoyl glutamate. In this study, [2H4]-p-aminobenzoyl glutamate, [2H4]-p-acetamidobenzoyl glutamate, and unlabeled p-acetamidobenzoyl glutamate were synthesized. The synthesis of the [2H4]-labeled compounds started at unlabeled p-aminobenzoic acid. For the formation of p-acetamidobenzoyl glutamate, p-aminobenzoyl glutamate was acetylated. The new substances were applied successfully in stable isotope dilution assays for the simultaneous quantification of the [13C5]-labeled and unlabeled folate catabolites, p-aminobenzoyl glutamate and p-acetamidobenzoyl glutamate, along with the predominant folate vitamers in urine. The assays were based on clean-up by strong anion exchange followed by liquid chromatography-tandem mass spectrometry detection. Assay sensitivity was sufficient to detect the folate catabolites in physiologic concentrations. The limit of detection was below 0.4 and 0.3 nmol/100 g for p-aminobenzoyl glutamate isotopologues and p-acetamidobenzoyl glutamate isotopologues in urine, respectively. The successful synthesis of [2H4]-p-aminobenzoyl glutamate, [2H4]-p-acetamidobenzoyl glutamate, and unlabeled p-acetamidobenzoyl glutamate and the implementation of these substances in stable isotope dilution assays allows dual-label designs that provide a more detailed insight into human folate metabolism.
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| 7. |
- Büttner, Barbara E, et al.
(author)
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Quantification of isotope-labelled and unlabelled folates in plasma, ileostomy and food samples.
- 2011
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In: Analytical and Bioanalytical Chemistry. - : Springer Science and Business Media LLC. - 1618-2642 .- 1618-2650. ; 399:1, s. 429-439
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Journal article (peer-reviewed)abstract
- New stable isotope dilution assays were developed for the simultaneous quantitation of [(13)C(5)]-labelled and unlabelled 5-methyltetrahydrofolic acid, 5-formyltetrahydrofolic acid, folic acid along with unlabelled tetrahydrofolic acid and 10-formylfolic acid in clinical samples deriving from human bioavailability studies, i.e. plasma, ileostomy samples, and food. The methods were based on clean-up by strong anion exchange followed by LC-MS/MS detection. Deuterated analogues of the folates were applied as the internal standards in the stable isotope dilution assays. Assay sensitivity was sufficient to detect all relevant folates in the respective samples as their limits of detection were below 0.62 nmol/L in plasma and below 0.73 μg/100 g in food or ileostomy samples. Quantification of the [(13)C(5)]-label in clinical samples offers the possibility to differentiate between folate from endogenous body pools and the administered dose when executing bioavailability trials.
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| 8. |
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| 9. |
- Celine, Steib, et al.
(author)
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Legume consumption in Sweden : a descriptive cross-sectional study
- 2020
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In: 13th European Nutrition Conference, FENS 2019, 15–18 October 2019, Malnutrition in an Obese World: European Perspectives. - : Cambridge University Press. ; , s. E335-E335
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Conference paper (other academic/artistic)abstract
- Despite the growing evidence supporting legume consumption as part of healthy and sustainable diet, little information is known on legume intake in the Swedish population. The aim of the present study was to describe legume consumers in Sweden, their nutrient intake and study the association with biomarkers of nutritional status using food consumption and biomonitoring data from Swedish adults in the 2010–11 National Riksmaten survey. Total legume intake - including pulses, fresh legumes, soy products, peanuts, sprouts and mixed meals with legumes - was estimated using a web-based 4-d food records in adults 18–80 years (n = 1772). A range of biomarkers including non-fasted plasma ferritin and folate, as well as erythrocyte folate, were measured for a subsample of the population (n = 282). Legumes were consumed by 44% of the population, median intake was 36 g/d (Q1 = 16; Q3 = 71; n = 777). Legumes provided on average 3.3% of individual's total energy intake (%E) with no significant difference between sexes. Pulses were consumed by 33% of consumers contributing to 3.2 ± 2.8 %E intake whereas soy products were consumed by 8.6% of legume consumers but contributing to 6 ± 7.5 %E. Legume intake among self-reported vegetarians (n = 55) was significantly higher (p < 0.000) than for non-vegetarians, with mean daily intakes of 92 ± 99 g/d and 21 ± 42 g/d, respectively. Age (p 0.0066) was significantly higher in Q4 of legume intake and alcohol consumption was significantly lower (p 0.0008); BMI, gender, smoking habits, education and total energy intake did not differ. 23% of legume consumers have a fiber intake of 25–35 g/d whereas only 11% of non-consumers reach recommended intake (p 0.0001). Iron, folate and dietary fiber intakes were significantly higher (p < 0.000) in Q4 of legume intake. 32% of legume consumers meet recommended intakes of folate (RI 300 μg/d) versus 18% for non-consumers (p 0.000). Notably, 5.76% of women of reproductive age (18–44 y.o.) eating legumes reach 400 μg/d versus 0.79% for non-consumers (p 0.002). Plasma ferritin and erythrocyte folate levels did not differ between legume consumers and non-consumers. However, for women in reproductive age (n = 31), plasma folate levels were significantly higher in consumers than non-consumers (p 0.0102). Legume consumers have higher fiber intake and more frequently meet recommended folate intakes while maintaining adequate iron intake. In conclusion, legume consumers in Sweden are characterized by a defined diet pattern that generally is associated with better health.
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| 10. |
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