Folates
Mostrando 1-12 de 70 artigos, teses e dissertações.
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1. Buriti of the cerrado of Minas Gerais, Brazil: physical and chemical characterization and content of carotenoids and vitamins
Abstract The fruit species of the Brazilian Cerrado, such as buriti (Mauritia vinifera ), occupy a prominent position in the ecosystem since they contribute to the economic potential of the region and have high nutritional value. We aimed to evaluate the physical characteristics, chemical composition and content of vitamin C, carotenoids, vitamin E and fola
Food Sci. Technol. Publicado em: 30/07/2018
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2. Otimização de método para análise de folatos em hortaliças folhosas por cromatografia líquida de alta eficiência com detecção por fluorescência
We optimized a method for the determination of three main folate isoforms in leafy vegetables. Analysis was carried out by HPLC, using gradient of elution and fluorescence detection. Limits of quantification were 2 ng/mL; 2 ng/mL and 28 ng/mL for tetrahydrofolate (THF), 5-methyltetrahydrofolate (5-MTHF) and 5-formyltetrahydrofolate (5-FTHF), respectively. Re
Química Nova. Publicado em: 2011
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3. Folatos, capacidade antioxidante e trans-2-nonenal em cerveja brasileira / Folate, antioxidant capacity and E-2-nonenal in Brazilian beer
In the present study methods were adapted and applied to quantify levels of folate, antioxidant capacity assessment and E-2-nonenal quantification in Brazilian beers. 5 brands of Pilsen, non-alcoholic and Malzbier beers were used, in can and amber bottle. For determination of folates (folic acid - FA, 10-methyl-folic acid - 10Methyl, 5-methyltetrahydrofolate
Publicado em: 2010
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4. Biofortificação de plantas de alface (Lactuca sativa L.) geneticamente modificadas para aumento do teor de folato
Folate is a complex B vitamin, water-soluble, formed by pterine, para-aminonzoic acid (pABA) and one to eight parts of glutamate. Some studies suggest that its deficiency in pregnant women is related to miscarriage, and that in the foetus it is related to defects of the neural tube, anencephalia, anacephalia, spine bifide, leporine lip and Down syndrome, and
Publicado em: 2009
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5. Analise dos polimorfismos MTHFD-1 1958G>A, TCII776 C>G, MTR 2756A>G, MTRR 66A>G, RFC-1 80G>A e SHMT-1 1420C>T como fatores geneticos de risco para sindrome de Down / Analysis of the polymorphism MTHFD-1 1958G>A, TCII776 C>G, MTR 2756A>G, MTRR 66A>G, RFC-1 80G>A e SHMT-1 1420C>T as risk factors for Down syndrome
A síndrome de Down (SD) é uma aberração cromossômica atribuída à presença de três cópias dos genes localizados no cromossomo 21. Ocorre com uma freqüência estimada de um indivíduo em 600 nascidos vivos e de uma em 150 concepções. Os mecanismos relacionados com a não-disjunção do cromossomo 21 não foram ainda elucidados e embora a idade mat
Publicado em: 2009
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6. Folatos em brócolis convencional e orgânico e perdas no processo de cocção em água
Broccoli is a vegetable consumed in many countries and a possible source of folates, which are water-soluble vitamins active during DNA synthesis. The folates found in the samples analyzed were 5-methyltetrahydrofolate and 5-formyltetrahydrofolate. The vitamin content varied between 413.7 and 742.2 µg/100 g for 5-methyltetrahydrofolate and from 4.8 to 12.8
Química Nova. Publicado em: 2008
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7. Metodologia analítica para determinação de folatos e ácido fólico em alimentos
The aim of this work was to develop and to validate a methodology using HPLC for the simultaneous determination of folates and folic acid in foods. The limits of detection and the recovery rates for the vitamins in the certified reference materials were respectively 5 pg/mL and 94-108% for 5-MTHF, 7 pg/mL and 97-102% for THF, 30 pg/mL and 97.9-104% for 5-FTH
Química Nova. Publicado em: 2006-10
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8. Folatos in vegetables - influence of the type culture and processing. / Folatos em vegetais - influencia do tipo de cultivo e do processamento.
Despite the recent discoveries about the possible beneficial actions of folates to human health, data on the real contents of this vitamin in Brazilian foods, are little, ever for vegetables, considered the main source of this nutrient. Scarcer still are studies on the stability of folates after domestic cooking and industrial food processing. Considering th
Publicado em: 2005
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9. Valor nutricional de cogumelos cultivados no Brasil. / Nutritional value of mushrooms cultivated in Brazil.
Very little is known regarding the quality of the edible mushrooms cultivated in Brazil, especially with respect to their nutritional value. Considering this and the constant interest of the consumer in natural vitamin sources, the present work evaluated methodologies for the determination of vitamins B1, B2, B6, B12, H and PP and developed and validated ana
Publicado em: 2004
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10. Identification of poly-gamma-glutamyl chain lengths in folates of Bacillus subtilis.
Bacillus subtilis strains 168 met ile leu and 23 thy contain folates which differ from one another in the number of glutamyl residues. The folate species were identified by reductive cleavage to the corresponding p-aminobenzoylglutamyl poly-gamma-glutamates and chromatography on diethylaminoethyl-cellulose. Pteroyltriglutamate is the predominant folate type,
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11. Purine biosynthesis in the domain Archaea without folates or modified folates.
The established pathway for the last two steps in purine biosynthesis, the conversion of 5-aminoimidazole-4-carboxamide ribonucleotide (ZMP) to IMP, is known to utilize 10-formyl-tetrahydrofolate as the required C1 donor cofactor. The biosynthetic conversion of ZMP to IMP in three members of the domain Archaea, Methanobacterium thermoautotrophicum deltaH, M.
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12. Distribution of folates and modified folates in extremely thermophilic bacteria.
Analyses were made of the structures and levels of folates and modified folates present in extremely thermophilic bacteria. These procedures involved the chemical analysis of products resulting from the oxidative cleavage of the 6-substituted, folatelike tetrahydropterins present in the cells. Air-oxidized cell extracts of extreme thermophiles from two membe