High Pressure Liquid Chromatography
Mostrando 1-12 de 814 artigos, teses e dissertações.
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1. Chemical Constituents and Cytotoxic Activity of Rhinella jimi (Anura: Bufonidae)
Rhinella jimi toads (Stevaux, 2002) belong to the Bufonidae family, are endemic in the Brazilian Northeast and are commonly found during rainy periods. In general, amphibians of this family have in their poisons different metabolites that show a diversity of pharmacological activities. The isolation and identification of these compounds are of great importan
J. Braz. Chem. Soc.. Publicado em: 2021-05
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2. Integrative Approach Based on Leaf Spray Mass Spectrometry, HPLC-DAD-MS/MS, and NMR for Comprehensive Characterization of Isoquinoline-Derived Alkaloids in Leaves of Onychopetalum amazonicum R. E. Fr.
Onychopetalum is an Amazonian botanical genus close-related with Bocageopsis and Unonopsis, whose species are used in traditional medicine. Although these genera are widely investigated from the phytochemical viewpoint, the knowledge about Onychopetalum remains almost unexplored. In order to perform a comprehensive characterization of isoquinoline-derived al
J. Braz. Chem. Soc.. Publicado em: 2020-01
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3. Effects of different heat treatments on the antioxidant activity and ascorbic acid content of bitter melon, Momordica charantia
Resumo Este estudo investiga o efeito de diferentes tratamentos térmicos, a saber, fervura, cozimento em micro-ondas e cozimento sob pressão sobre o ácido ascórbico e a atividade antioxidante no extrato de Momordica charantia. A atividade antioxidante total dos extratos de M. charantia foi determinada pelo poder redutor-antioxidante férrico e pelos ensa
Braz. J. Food Technol.. Publicado em: 14/11/2019
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4. Design and characterization of nanocarriers loaded with Levofloxacin for enhanced antimicrobial activity; physicochemical properties, in vitro release and oral acute toxicity
Inorganic and carbon based nanomaterials are widely used against several diseases, such as cancer, autoimmune diseases as well as fungi and bacteria colonization. In this work, Santa Barbara Amorphous mesoporous silica (SBA), Halloysite Nanotubes (HNTs) and Multiwalled Carbon Nanotubes (CNTs) were loaded with fluoroquinolone Levofloxacin (LVF) to be applied
Braz. J. Pharm. Sci.. Publicado em: 12/08/2019
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5. Larvicidal Activity of Beauveria bassiana Extracts against Aedes aegypti and Identification of Beauvericins
Beauveria bassiana is an entomopathogenic fungus that has been well known for its capacity to act as biopesticide on various disease vectors. The analysis of organic extracts of strains CG71 and UNI40 led to identification of cyclodepsipeptides beauvericin, beauvericin A or F, beauvericin E and bassianolide by ultra-high pressure liquid chromatography-high r
J. Braz. Chem. Soc.. Publicado em: 2017-06
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6. Three New Steroidal Glycoalkaloids from Solanum pseudoquina A. St.-Hil. (Solanaceae)
Three new steroidal glycoalkaloids (SGA) were isolated from green berries of Solanum pseudoquina A. St.-Hil. The extract obtained after treatment with 5% acetic acid aqueous solution was subjected to several chromatographic procedures, leading to an enriched alkaloidal fraction. The enriched alkaloidal fraction was subjected to a semi preparative high perfor
J. Braz. Chem. Soc.. Publicado em: 2017-05
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7. Assessment of human health risk associated with the presence of pesticides in chicken eggs
Abstract The presence of pesticides in the environment is highly toxic to environment and human health. Aim of the study was determination, quantification and assessment of associated health risk due to presence of pesticide residues in chicken eggs using high pressure liquid chromatography. HPLC method was successfully employed and validated. From collected
Food Sci. Technol. Publicado em: 09/03/2017
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8. Identification of Triterpenoids from Schefflera systyla, Odontadenia puncticulosa and Conostegia speciosa and In Depth Investigation of Their in vitro and in vivo Antifungal Activities
As a part of a broad screening of antifungal agents from plant origin, crude extracts from Panamanian plants having related types of constituents displayed significant activities in an agar overlay thin layer chromatography assay against a susceptible strain of Candida albicans. These were the methanolic extract of the leaves of Schefflera systyla and Odonta
J. Braz. Chem. Soc.. Publicado em: 2017-03
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9. Volatile metabolites produced from agro-industrial wastes by Na-alginate entrapped Kluyveromyces marxianus
Abstract The aim of this study was to evaluate the effects of alginate entrapment on fermentation metabolites of Kluyveromyces marxianus grown in agrowastes that served as the liquid culture media. K. marxianus cells entrapped in Na-alginate were prepared using the traditional liquid-droplet-forming method. Whey and pomaces from processed tomatoes, peppers,
Braz. J. Microbiol.. Publicado em: 2016-12
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10. Evaluation of mechanism for antihypertensive and vasorelaxant effects of hexanic and hydroalcoholic extracts of celery seed in normotensive and hypertensive rats
ABSTRACT Celery (Apium graveolens L., Apiaceae) is one of the popular aromatic vegetables and part of the daily diet around the world. In this study, aqueous-ethanolic and hexane extracts of celery seed were prepared and the amount of n-butylphthalide, as an active component, was determined in each extract. Then the effects of hexanic extract on systolic, di
Rev. bras. farmacogn.. Publicado em: 2016-10
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11. FASES ESTACIONÁRIAS DE LÍQUIDOS IÔNICOS EM CROMATOGRAFIA GASOSA: FUNDAMENTOS, AVANÇOS RECENTES E PERSPECTIVAS
Since their original discovery in 1914, ionic liquids (IL) have been widely examined and explored in chemistry due to their unique physical and chemical properties. Ionic liquids are collectively known as organic salts and have melting points of 100 °C or under. The molten salts most employed in analytical chemistry, including gas chromatography (GC), consi
Quím. Nova. Publicado em: 2016-01
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12. Anti-inflammatory effects of intravenous methotrexate associated with lipid nanoemulsions on antigen-induced arthritis
OBJECTIVE: To test the hypothesis that intravenous use of methotrexate associated with lipid nanoemulsions can achieve superior anti-inflammatory effects in the joints of rabbits with antigen-induced arthritis compared with commercial methotrexate. METHODS: Arthritis was induced in New Zealand rabbits sensitized with methylated bovine serum albumin and sub
Clinics. Publicado em: 2016-01