Gustavo Oliveira Everton Reihenfolge der Bücher (Chronologisch)

The study focuses on the antioxidant properties of Ocimum citriodurum, revealing that rosmarinic acid is the predominant compound in its hydroalcoholic extract. Utilizing HPLC-MS, researchers identified seven chemical constituents and established an active potential of 0.547 for the extract's antioxidant activity. In vitro tests confirmed its efficacy with a 50% effective concentration of 50.53 mg/L against the DPPH method. Additionally, a Didactic Sequence was developed to teach about bioactive molecules and antioxidants, integrating findings with organic chemistry content.

The book explores the remarkable properties of essential oils from various plants, focusing on their antioxidant, anti-inflammatory, and anti-arthritic activities. It details the extraction and characterization of these oils through hydrodistillation and GC-MS analysis, identifying 48 chemical constituents, predominantly (E)-anethole. The study highlights the preparation of a low-energy phase inversion nanoemulsion, demonstrating significant efficacy in biological assays, suggesting that nanoencapsulated systems could enhance pharmacological applications.

The study explores the synthesis of silver nanoparticles (AgNPs) from Piper nigrum essential oil nanoemulsion, utilizing a phase inversion method and AgNO3 reduction. It highlights the chemical profile, with limonene as the primary component, and evaluates the antioxidant and anti-inflammatory activities of the AgNPs. Notably, the research found an IC50 value of 16.26 mg L-1 for antioxidant activity and 0.217 mg mL-1 for anti-inflammatory effects at pH 11, demonstrating the efficacy of P. nigrum AgNPs in enhancing these biological activities.

The study focuses on the innovative synthesis and evaluation of silver nanoparticles (AgNPs) derived from the hydroalcoholic extract of Passiflora edulis Sims seeds. Using cold maceration and HPLC-MS for chemical profiling, the research identified Genisteins as the primary constituent. AgNPs were synthesized through Ag+ reduction and characterized via UV-Vis spectrophotometry and DLS. The antioxidant activity was assessed using the ABTS method, revealing a notable CI50 of 9.23 mg L-1 at pH 4, highlighting the effectiveness of these nanoparticles and the influence of pH on their properties.

The study investigates the chemical and biological properties of Ixora coccinea L. through hydroalcoholic extracts and fractions. Using high-performance liquid chromatography coupled with mass spectrometry (HPLC/MS), catechol was identified as the predominant component. The research assessed antioxidant, anti-inflammatory, and anti-arthritic activities, revealing effective concentrations (EC50) that indicate strong biological activity across all assays. The antioxidant activity showed EC50 values between 6.45 and 87.15 ppm, while anti-inflammatory and anti-arthritic activities ranged from 32.27 to 198.06 ppm and 10.76 to 66.02 ppm, respectively.

The study focuses on the antioxidant properties of natural molecules from the hydroalcoholic extract of Ocimum citriodurum, identifying seven chemical constituents, primarily rosmarinic acid. Using HPLC-MS, the extract demonstrated significant antioxidant activity with an in silico active potential of 0.547 and an in vitro EC50 of 50.53 mg/L against the DPPH method. Additionally, the research led to the development of an educational Teaching Sequence on bioactive molecules and antioxidants, integrating Organic Functions into the curriculum through the PASS Online and PubChem resources.

Brazil boasts an impressive diversity of plant species, estimated between 50,542 and 60,042, across six distinct biomes. These include the lush Amazon rainforest, the central Cerrado savannah, the Atlantic Mata Atlântica, the arid Caatinga, the southern Pampa grasslands, and the unique Pantanal wetlands. This rich variety highlights Brazil's status as one of the most biodiverse countries globally, showcasing its ecological significance and the importance of preserving these unique environments.

The study investigates the larvicidal properties of essential oil and nanoemulsion derived from Coleus aromaticus Benth leaves against Aedes aegypti larvae. It reveals a significant phenolic content and promising antioxidant activity. The essential oil demonstrated larvicidal effects with an LC50 of 3.24 mg L-1, while the nanoemulsion exhibited even greater efficacy at 1.83 mg L-1. These findings suggest the potential of both products as biocontrol agents in combating Aedes aegypti, highlighting the market viability of the nanoemulsion.

O teor total de fenol foi de 252,35 mg EAT g-1 para C. limonia e L. nobilis EO, o que é um resultado significativo para as actividades farmacológicas. No teste de actividade antioxidante, um EC50 de 85,20 mg L-1, EC50 de 77,23 mg L-1, EC50 de 88,13 mg L-1, EC50 de 45,30 mg L-1 para a acção de EO e nanoemulsões (NHE 1, NHE 2 e NHE 3) de C. limonia e L. nobilis, respectivamente, foram classificados como acção promissora. O óleo essencial estudado obtido por cruzamento e as suas nanoemulsões (NHE 1, NHE 2 e NHE 3) mostraram um potencial anti-inflamatório, com um EC50 de 161,84 mg L-1, um EC50 de 220,07 mg L-1, um EC50 de 186,85 mg L-1 e um EC50 de 252,67 mg L-1, respectivamente. Através dos resultados obtidos, confirmou-se a acção antioxidante e anti-inflamatória do óleo obtido pelo cruzamento das espécies de C. limonia e L. nobilis e um aumento do seu potencial quando o óleo é incorporado em nanoemulsões. Proporcionando resultados expressivos e inovadores, dada a sua ausência na literatura, a sua aplicação é apreciada e são encorajados mais estudos devido ao seu potencial biotecnológico.

P. guajava leaves and essential oil obtained by hydrodistillation technique were collected. Chemical constituents were evaluated by gas chromatography-mass spectrometry (GC/MS). The total phenolic content was quantified by the Folin-Ciocalteau spectrophotometric method. For the toxicity test, the Artemia salina bioassay was applied. The nanoemulsion (W/A) was prepared using the low energy phase inversion method. The LC50 was calculated for the action of the nanoemulsion against Aedes aegypti larvae by the Probit method. The main chemical constituent found in the essential oil of P. guajava was -pinene 34.25%. Total phenolic compounds were quantified as 210.35 mg EAT g-1. In the toxicity bioassay, the LC50 of 323.6 mg L-1 was classified as non-toxic. The nanoemulsion droplets after 30 days of handling had an average size of 120.41 ± 0.55 nm. The larvicidal activity of the nanoemulsion showed mortality at concentrations of 10 to 100 mg L-1 with an LC50 of 12.75 mg L-1.

The study investigates the essential oil of Aniba rosaeodora Ducke, highlighting its primary component, linalool, which constitutes 63.16% of the oil and shows promise for pharmaceutical applications. Toxicity tests reveal a non-toxic classification with an LC50 range of 582 to 282 mg L-1. The oil exhibits significant larvicidal activity against Aedes aegypti larvae, with an LC50 of 41.07 mg L-1, alongside notable antioxidant properties. The findings suggest its potential for effective larvicidal applications.

The study explores the growing interest in essential oils as natural alternatives to synthetic additives in food, highlighting their chemical profiles and antibacterial properties. Essential oils derived from natural condiments were found to be nontoxic to Artemia salina Leach and demonstrated significant bactericidal activity against clinically relevant bacteria. Notably, oils from O. vulgare, T. vulgaris, and C. zeylanicum showed effective results. The research emphasizes the potential of these essential oils as cost-effective, natural solutions for combating pathogenic microorganisms in food applications.

Focusing on the antimicrobial properties of Bixa orellana Labill leaves, this research explores the essential oil extracted through hydrodistillation. Detailed chemical characterization was achieved using Gas Chromatography-Mass Spectrometry, while toxicity was assessed with Artemia salina, revealing a non-toxic classification. The study demonstrated antimicrobial efficacy against Escherichia coli and Staphylococcus aureus, with significant total phenolic content. These findings underscore the potential of this essential oil as a sustainable therapeutic alternative.

The research investigates the chemical composition and larvicidal properties of microencapsulated essential oil from Citrus aurantium against Aedes aegypti. Extracted through hydrodistillation, the oil was characterized using GC-MS, revealing key components like (-)-Terpinen-4-ol and Caryophyllene oxide. The study employed the Folin-Ciocalteu method to measure phenolic content and determined the oil's lethality, finding an LC50 of 3.589 mg L-1. The findings suggest the essential oil's effectiveness as a potential agent for controlling mosquito populations.

The study investigates the chemical composition and larvicidal properties of microencapsulated essential oil from Citrus aurantium against Aedes aegypti. Extracted through hydrodistillation and characterized by GC-MS, the oil demonstrated significant larvicidal activity with an LC50 of 3.589 mg L-1. The main components identified were (-)-terpinen-4-ol and caryophyllene oxide. The findings highlight the essential oil's potential as an effective agent for controlling Aedes aegypti, contributing to pest management strategies.

The study investigates the essential oil of Aniba rosaeodora, focusing on its chemical composition, toxicity, antioxidant potential, and effectiveness against Aedes aegypti larvae. Extracted via hydrodistillation, the oil predominantly contains -linalol at 63.16%, highlighting its pharmaceutical promise. Toxicity tests indicate it is non-toxic, while the oil demonstrates significant larvicidal activity with an LC50 of 41.07 mgL-1, along with notable antioxidant properties. These findings suggest its potential application in controlling mosquito populations.

The study investigates the essential oil of Aniba rosaeodora Ducke, highlighting its primary chemical component, linalool, which constitutes 63.16% of the oil and shows promise for pharmaceutical applications. Toxicity tests indicate a non-toxic profile, with an LC50 range of 582 to 282 mg L-1. The oil exhibits effective larvicidal activity against Aedes aegypti, with an LC50 of 41.07 mg L-1, and demonstrates significant antioxidant properties. These findings suggest its potential for application in pest control and health-related fields.

Die Studie beleuchtet die antimikrobielle und antioxidative Wirkung der ätherischen Öle von Hymenaea courbaril und Syzygium cumini. Der Hauptbestandteil des Öls von H. courbaril ist beta-Ozimen, während S. cumini Isocaryophyllen enthält. Beide Öle zeigen eine starke antioxidative Aktivität sowie Toxizität gegenüber Artemia salina. Zudem besitzen sie bakterizide Eigenschaften gegen mehrere pathogene Bakterien, darunter E. coli und S. aureus. Die Ergebnisse deuten auf das Potenzial dieser ätherischen Öle zur Bekämpfung von Mikroorganismen hin.

The study investigates the molluscicidal properties of essential oils from Syzygium cumini and Hymenaea courbaril, extracted through hydrodistillation and analyzed via Gas Chromatography-Mass Spectrometry. Toxicity tests using Artemia salina indicated both oils were nontoxic, with specific LC50 values for each. The molluscicidal assays revealed effective concentrations against Biomphalaria glabrata, suggesting these essential oils could serve as natural alternatives to combat schistosomiasis-carrying snails.

The study investigates the impact of drying Alpinia leaves on the properties of their essential oils, utilizing mathematical models to analyze the drying process. Results indicate significant variations in essential oil characteristics based on drying conditions, with 45 °C yielding optimal antimicrobial activity and lower toxicity. The findings highlight the importance of drying temperature in affecting the physicochemical and biological properties of essential oils, underscoring the need for further research to refine predictive models for drying processes.

The study focuses on the impact of drying Alpinia zerumbet leaves on the properties of their essential oils (EOs), utilizing mathematical models to analyze drying kinetics. Results indicated that drying at 45 °C yielded the most effective EOs, showcasing superior antimicrobial activity and low toxicity. The findings highlight the significance of drying temperature in affecting the physicochemical and biological characteristics of EOs, emphasizing the need for further research on optimal drying conditions and their influence on essential oil quality.

The study investigates the antimicrobial, antioxidant, and toxicity properties of essential oils from Hymenaea courbaril bark and Syzygium cumini leaves. Notably, H. courbaril's major component is -ocimene, while S. cumini contains isocaryophyllene. Both essential oils demonstrated strong antioxidant activity and toxicity against Artemia salina, alongside bactericidal effects against several pathogenic bacteria, including E. coli and S. aureus. The findings highlight the potential of these essential oils in combating harmful microorganisms.

The study investigates the chemical profiles and antimicrobial properties of essential oils from C. citratus, O. basilicum, and A. rosaeodora. Utilizing hydrodistillation and gas chromatography-mass spectrometry, the research identifies key components such as linalool in A. rosaeodora and geranial in C. citratus. Antimicrobial tests reveal varying inhibition zones, with O. basilicum showing the strongest effect against S. aureus. The findings highlight the potential of these essential oils in controlling pathogenic microorganisms, supporting their application in health and safety contexts.