Derivatives Of Ascorbic Acid
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Ascorbic acid and phenolic contents, antioxidant capacity and flavonoids composition of Brazilian Savannah native fruits
Abstract Brazilian Savannah native fruits have been investigated as potential sources of antioxidant substances. Cagaita, cerrado cashew and gabiroba were characterized with regard to the ascorbic acid and phenolic contents, antioxidant capacity and flavonoids composition. Gabiroba presented higher contents of ascorbic acid (61.5 mg.100 g–1), total phenoli
Food Sci. Technol. Publicado em: 09/03/2017
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2. 2-Bromo-1,4-naphthoquinone: a potentially improved substitute of menadione in Apatone™ therapy
Apatone™, a combination of menadione (2-methyl-1,4-naphthoquinone, VK3) and ascorbic acid (vitamin C, VC) is a new strategy for cancer treatment. Part of its effect on tumor cells is related to the cellular pro-oxidative imbalance provoked by the generation of hydrogen peroxide (H2O2) through naphthoquinone redox cycling. In this study, we attempted to fin
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-08
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3. DEVELOPMENT OF METHOD FOR DETERMINATION OF AS, SB AND SE IN BIODIESEL AND PETROLEUM BY INDUCTIVELY COUPLED PLASMA OPTICAL EMISSION SPECTROMETRY WITH SAMPLE INTRODUCTION BY HYDRIDE GENERATION (HG ICP / DESENVOLVIMENTO DE MÉTODO PARA DETERMINAÇÃO DE AS, SB E SE EM BIODIESEL E PETRÓLEO POR ICP OES COM INTRODUÇÃO DE AMOSTRA POR GERAÇÃO DE HIDRETOS
With the increasing world population and the consequent increasing in industrial activities and fuel consumption, chemical pollution has been a major problem of the XXI century. Alternatives that can minimize such problems are targets of researches, such as the use of biodiesel, a renewable and less polluting fuel. Elements usually found in low concentration
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
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4. Estudo das características físico-químicas e funcionalidade de bagaços de frutas tropicais desidratados em leito de jorro / Physical-chemical characterization and functionality of dried tropical fruit wastes obtained by using the spouted bed drier
Fruits are rich sources of bioactive compounds, including phenolic compounds. Tropical fruit cultivation is an important productive segment in Brazilian Northeast. Its industrialization generates solid wastes as co-products, with potential environmental impact. Considering the recognized bioactive content of fruit and its derivatives, this research has the o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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5. Vitamina c e seus derivados em produtos dermatológicos : aplicações e estabilidade / Vitamin C and its derivatives in dermatological products: applications and stability
A vitamina C (ácido ascórbico) tem sido muito utilizada em produtos cosméticos e dermatológicos por apresentar importantes efeitos fisiológicos na pele. Um dos principais efeitos do ácido ascórbico é no combate à pele foto-envelhecida, em decorrência de sua característica antioxidante. Entretanto, a estabilidade da vitamina C é muito prejudicada
Publicado em: 2010
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6. Evaluation of ascorbic acid in protecting labile folic acid derivatives.
The use of ascorbic acid as a reducing agent to protect labile, reduced derivatives of folic acid has been evaluated by high-performance liquid chromatographic separations and Lactobacillus casei microbiological assay of eluate fractions. Upon heating for 10 min at 100 degrees C, solutions of tetrahydropteroylglutamic acid (H4PteGlu) in 2% sodium ascorbate g
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7. Evaluation of ascorbic acid in protecting labile folic acid derivatives
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8. Vitamin C in human health and disease is still a mystery ? An overview
Ascorbic acid is one of the important water soluble vitamins. It is essential for collagen, carnitine and neurotransmitters biosynthesis. Most plants and animals synthesize ascorbic acid for their own requirement. However, apes and humans can not synthesize ascorbic acid due to lack of an enzyme gulonolactone oxidase. Hence, ascorbic acid has to be supplemen
BioMed Central.
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9. Sequence-targeted chemical modifications of nucleic acids by complementary oligonucleotides covalently linked to porphyrins.
Oligo-heptathymidylates covalently linked to porphyrins bind to complementary sequences and can induce local damages on the target molecule. In dark reactions, iron porphyrin derivatives exhibited various chemical reactivities resulting in base oxidation, crosslinking and chain scission reactions. Reactions induced by reductants, such as ascorbic acid, dithi
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10. Total synthesis of the cytotoxic cyclodepsipeptide (-)-doliculide: The “ester” effect in acyclic 1,3-induction of deoxypropionates
The total synthesis of the marine cyclodepsipeptide (-)-doliculide is described. An acyclic (2S,4S,6R)-trimethyl alkanoic acid precursor to the “hydrocarbon” portion of doliculide was synthesized starting with l-ascorbic acid based on a stereocontrolled iterative conjugate addition of lithium dimethylcuprate to acyclic δ-Cmethyl α,β-unsaturated ester
National Academy of Sciences.
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11. Antioxidant activity of carnosine, homocarnosine, and anserine present in muscle and brain.
Carnosine, homocarnosine, and anserine are present in high concentrations in the muscle and brain of many animals and humans. However, their exact function is not clear. The antioxidant activity of these compounds has been examined by testing their peroxyl radical-trapping ability at physiological concentrations. Carnosine, homocarnosine, anserine, and other