Natural Products
Mostrando 13-24 de 1429 artigos, teses e dissertações.
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13. Electrochemical Behavior of Unusual Dimeric Flavonoids Isolated from Fridericia platyphylla
Brazil has the greatest plant diversity on the planet, distributed in different types of biomes. These plants are important sources of biologically active natural products, which are derived from various drugs marketed worldwide. This paper presents an electrochemical study of three unusual dimeric flavonoids, pharmacologically active, isolated and identifie
J. Braz. Chem. Soc.. Publicado em: 2021-06
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14. ERRATA
Abstract After natural fermentation and solar drying, sour cassava starch acquires expansion property. Traditionally, solar drying occurs without protection, and consequently physical contamination can arise. Thus, the aim of this study was to produce sour cassava starch using a low-cost solar dryer to prevent contamination, whilst retaining the expansion pr
Rev Bras Med Esporte. Publicado em: 2021-06
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15. Traditional sour cassava starch obtained with alterations in the solar drying stage
Abstract After natural fermentation and solar drying, sour cassava starch acquires expansion property. Traditionally, solar drying occurs without protection, and consequently physical contamination can arise. Thus, the aim of this study was to produce sour cassava starch using a low-cost solar dryer to prevent contamination, whilst retaining the expansion pr
Food Sci. Technol. Publicado em: 2021-06
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16. Electrochemical Preparation and Evaluation of Cytotoxic Activity of Methoxyl-oxo-biseugenol, a New Oxidized Derivative of Biseugenol
Electrochemical procedures have emerged as a powerful tool for the synthesis of complex organic molecules including transformation of natural products. In this study, the electrosynthesis of biseugenol in MeOH afforded one new oxidized derivative, which was characterized as methoxyl-oxo-biseugenol (MOB) by nuclear magnetic resonance (NMR) and electrospray io
J. Braz. Chem. Soc.. Publicado em: 2021-05
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17. Food safety: relation between pesticides and poisoning
Abstract Brazil has worldwide relevance in agriculture, as well as being one of the largest consumers of pesticides. This reality associated with underreporting of poisonings, food sample data above the permitted limit of current legislation, possible pesticide flexibilities and increasing smuggling of these products. This study aimed to evaluate the marketi
Food Sci. Technol. Publicado em: 2021-03
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18. Response surface optimization of polysaccharide extraction from Galla Chinensis and determination of its antioxidant activity in vitro
Abstract Galla Chinensis was a traditional Chinese medicine used as an ingredient in many prescriptions for the treatment of oxidant damage-associated symptoms in China. The current research on the isolation of polysaccharides from Galla Chinensis and their antioxidant activities still remain as an ongoing challenge. The purpose of this study is to develop a
Food Sci. Technol. Publicado em: 2021-03
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19. A IMPORTÂNCIA DAS CUMARINAS PARA A QUÍMICA MEDICINAL E O DESENVOLVIMENTO DE COMPOSTOS BIOATIVOS NOS ÚLTIMOS ANOS
Coumarins are natural products characterized as 2H-chromen-2-one, according to IUPAC nomenclature, largely distributed in plants, as well as, in species of fungi and bacteria. Nowadays, many synthetic procedures allow the discovery of coumarins with expanded chemical space. The ability to exert non-covalent interactions with many enzymes and receptors in liv
Quím. Nova. Publicado em: 2021-02
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20. Theoretical Study of the Reactivity of Phenyl Radicals Toward Enol Acetates
Arylation reactions are an important class of reactions and allow the synthesis of natural and synthetic products. Despite the efficient, but high cost and toxic methodologies involving transition metals, radical arylations have gained importance after the advent of photoredox catalysis. Arylation of enol acetates is an important tool for obtaining aryl keto
J. Braz. Chem. Soc.. Publicado em: 2021-02
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21. Mitral Valve Replacement with Regent Aortic Valve in Severe Mitral Stenosis
Arylation reactions are an important class of reactions and allow the synthesis of natural and synthetic products. Despite the efficient, but high cost and toxic methodologies involving transition metals, radical arylations have gained importance after the advent of photoredox catalysis. Arylation of enol acetates is an important tool for obtaining aryl keto
Int. J. Cardiovasc. Sci.. Publicado em: 2021-02
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22. UTILIZAÇÃO DE BIOMASSA EM AULAS DE GRADUAÇÃO DE QUÍMICA ORGÂNICA EXPERIMENTAL: EXTRAÇÃO DE FLAVONOIDES A PARTIR DE RESÍDUOS DE CASCAS DE FRUTAS CÍTRICAS
This work describes the importance of using renewable sources in experimental classes for undergraduate students, as well as to spread the ideas of using biomass wastes as a source of products of interest. Therefore, in the proposed experiment, citrus fruit peel waste was employed to obtain pure flavonoids by extraction and recristalization. These procedures
Quím. Nova. Publicado em: 2020-12
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23. Acerola by-product as a renewable source of bioactive compounds: arabic gum and maltodextrin nanocapsules
Abstract Acerola industrial by-products present high levels of antioxidant compounds. Encapsulation technology has shown to be of great importance in the food industry. In this context, better nanoparticles are indicated in aiming to enrich food products with bioactive compounds. Five formulations were analyzed for yield, size distribution and zeta potential
Food Sci. Technol. Publicado em: 2020-12
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24. Spices as natural additives for beef burger production
Abstract This study aimed to investigate if the inclusion of different spices in bovine burger affects bacterial growth, lipid oxidation and sensorial characteristics of the products. Four hamburger formulations were prepared: control (without additives), saffron (1%), ginger (1%) and urucum (1%). The products were analyzed for total bacterial count (TBC) on
Food Sci. Technol. Publicado em: 2020-12