RESUMO
Fabiana punensis S. C. Arroyo is a subshrub or shrub that is indigenous to the arid and semiarid region of northern Argentina and is known to possess several medicinal properties. The objective of this study was to optimize the extraction conditions so as to maximize the yield of bioactive total phenolic compound (TPC) and flavonoids (F) of F. punensis' aerial parts by using non-conventional extraction methods, namely ultrasound-assisted extraction, UAE, and microwave-assisted extraction, MAE, and to compare the biological activities and toxicity of optimized extracts vs. conventional extracts, i.e., those gained by maceration. Response Surface Methodology (RSM) was used to apply factorial designs to optimize the parameters of extraction: solid-to-liquid ratio, extraction time, ultrasound amplitude, and microwave power. The experimental values for TPC and F and antioxidant activity under the optimal extraction conditions were not significantly different from the predicted values, demonstrating the accuracy of the mathematical models. Similar HPLC-DAD patterns were found between conventional and UAE- and MAE-optimized extracts. The main constituents of the extracts correspond to phenolic compounds (flavonoids and phenolic acids) and apigenin was identified. All extracts showed high scavenger capacity on ABTSâ¢+, O2â¢- and H2O2, enabling the inhibition of the pro-inflammatory enzymes xanthine oxidase (XO) and lipoxygenase (LOX). They also showed an antimutagenic effect in Salmonella Typhimurium assay and cytotoxic/anti-proliferative activity on human melanoma cells (SKMEL-28). Toxicological evaluation indicates its safety. The results of this work are important in the development of efficient and sustainable methods for obtaining bioactive compounds from F. punensis for the prevention of chronic degenerative diseases associated with oxidative stress, inflammation, and DNA damage.
Assuntos
Antioxidantes , Micro-Ondas , Fenóis , Componentes Aéreos da Planta , Extratos Vegetais , Fenóis/química , Fenóis/farmacologia , Fenóis/isolamento & purificação , Extratos Vegetais/farmacologia , Extratos Vegetais/química , Componentes Aéreos da Planta/química , Antioxidantes/farmacologia , Antioxidantes/química , Antioxidantes/isolamento & purificação , Humanos , Flavonoides/farmacologia , Flavonoides/química , Flavonoides/isolamento & purificação , Cromatografia Líquida de Alta Pressão , Ondas Ultrassônicas , Fracionamento Químico/métodos , Xantina Oxidase/antagonistas & inibidores , Xantina Oxidase/metabolismoRESUMO
One of the principal byproducts of coffee roasting is the coffee parchment. It is abundant in bioactive substances, including derivatives of chlorogenic acids, which are well-known for their exceptional antioxidant effects. It is advantageous to use environmentally friendly extraction techniques on such residues since it adds value to the entire coffee production process supply chain. The aim of this work was to assess and enhance the ability of non-conventional extraction techniques to extract derivatives of chlorogenic acid from coffee parchment. A central composite design was used to maximize the recovery of those phenolic compounds. The optimized extraction conditions were with 5 min extraction period, at a temperature of 70 °C, and 80% ethanol in the extractor solvent. In this conditions extraction recovery of chlorogenic acids was of 0.8% by the use of microwave-aided extraction (MAE). The optimized conditions are practical, economical, and ecologically friendly method to extract phenolic compounds and, consequently, underscores the potential for sustainable utilization of coffee parchment, offering a valuable contribution to the development of environmentally conscious strategies within the coffee industry.
Assuntos
Ácido Clorogênico , Coffea , Café , Extratos Vegetais , Ácido Clorogênico/isolamento & purificação , Ácido Clorogênico/química , Ácido Clorogênico/análise , Coffea/química , Extratos Vegetais/química , Extratos Vegetais/isolamento & purificação , Café/química , Fracionamento Químico/métodos , Fracionamento Químico/instrumentação , Micro-Ondas , Temperatura AltaRESUMO
This study proposes a method for the ultrasonic extraction of carotenoids and chlorophyll from Scenedesmus obliquus and Arthrospira platensis microalgae with green solvents. Ethanol and ethanolic solutions of ionic liquids were tested with a variety of extraction parameters, including number of extractions, time of extraction, and solid-liquid ratio R(S/L), to determine the optimal conditions. After selecting the most effective green solvent (ethanol), the process conditions were established: R(S/L) of 1:10, three extraction cycles at 3 min each), giving an extraction yield of 2602.36 and 764.21 µgcarotenoids.gdried biomass-1; and 22.01 and 5.81 mgchlorophyll.gdried biomass-1 in S. obliquus and A. platensis, respectively. The carotenoid and chlorophyll extracts obtained using ethanol were shown to be potent scavengers of peroxyl radical, being 5.94 to 26.08 times more potent α-tocopherol. These findings pave the way for a green strategy for valorizing microalgal biocompounds through efficient and environmentally friendly technological processes.
Assuntos
Carotenoides , Clorofila , Química Verde , Microalgas , Scenedesmus , Solventes , Carotenoides/isolamento & purificação , Carotenoides/química , Microalgas/química , Clorofila/química , Clorofila/isolamento & purificação , Solventes/química , Scenedesmus/química , Scenedesmus/crescimento & desenvolvimento , Spirulina/química , Ultrassom , Fracionamento Químico/métodosRESUMO
Propolis is a resinous bee product with a very complex composition, which is dependent upon the plant sources that bees visit. Due to the promising antimicrobial activities of red Brazilian propolis, it is paramount to identify the compounds responsible for it, which, in most of the cases, are not commercially available. The aim of this study was to develop a quick and clean preparative-scale methodology for preparing fractions of red propolis directly from a complex crude ethanol extract by combining the extractive capacity of counter-current chromatography (CCC) with preparative HPLC. The CCC method development included step gradient elution for the removal of waxes (which can bind to and block HPLC columns), sample injection in a single solvent to improve stationary phase stability, and a change in the mobile phase flow pattern, resulting in the loading of 2.5 g of the Brazilian red propolis crude extract on a 912.5 mL Midi CCC column. Three compounds were subsequently isolated from the concentrated fractions by preparative HPLC and identified by NMR and high-resolution MS: red pigment, retusapurpurin A; the isoflavan 3(R)-7-O-methylvestitol; and the prenylated benzophenone isomers xanthochymol/isoxanthochymol. These compounds are markers of red propolis that contribute to its therapeutic properties, and the amount isolated allows for further biological activities testing and for their use as chromatographic standards.
Assuntos
Distribuição Contracorrente , Própole , Própole/química , Distribuição Contracorrente/métodos , Cromatografia Líquida de Alta Pressão , Brasil , Animais , Fracionamento Químico/métodos , Abelhas/químicaRESUMO
Jabuticaba peel, rich in antioxidants, offering health benefits. In this study, the extraction of phenolic compounds from jabuticaba peel using ultrasound-assisted (UA) and their subsequent concentration by nanofiltration (NF) employing a polyamide 200 Da membrane was evaluated. The UA extractions were conducted using the Central Composite Rotatable Design (CCRD) 22 methodology, with independent variables extraction time (11.55 to 138 min) and temperature (16.87 to 53.3 °C), and fixed variables mass to ethanol solution concentration at pH 1.0 (1:25 g/mL), granulometry (1 mm), and ultrasonic power (52.8 W). The maximum concentrations obtained were 700.94 mg CE/100 g for anthocyanins, 945.21 mg QE/100 g for flavonoids, 133.19 mg GAE/g for phenols, and an antioxidant activity IC50 of 24.36 µg/mL. Key phenolic compounds identified included cyanidin-3-glucoside, delphinidin-3-glucoside, and various acids like syringic and gallic. NF successfully concentrated these compounds, enhancing their yield by up to 45%. UA and NF integrate for sustainable extraction.
Assuntos
Antioxidantes , Frutas , Fenóis , Extratos Vegetais , Fenóis/química , Fenóis/isolamento & purificação , Extratos Vegetais/química , Extratos Vegetais/isolamento & purificação , Frutas/química , Antioxidantes/química , Antioxidantes/isolamento & purificação , Filtração , Myrtaceae/química , Antocianinas/química , Antocianinas/isolamento & purificação , Fracionamento Químico/métodosRESUMO
The interest in natural colorants derived from sustainable processes has prompted research into obtaining bixin from defatted annatto (Bixa orellana L.) seeds. Bixin is a compound that imparts yellow-orange-red coloration, known for its high biodegradability, low toxicity, and wide industrial applicability. Meanwhile, high-intensity ultrasound (HIUS) technology has emerged as a promising method for extracting natural colorants, offering higher yields through shorter processes and minimizing thermal degradation. Although some studies have demonstrated the efficiency of HIUS technology in bixin extraction, research on the effects of acoustic cavitation on the properties of the colorant remains limited. Therefore, this study aimed to investigate the influence of HIUS-specific energy levels (0.02, 0.04, 0.12, and 0.20 kJ/g) on the chemical, physical, and morphological characteristics of annatto extracts containing bixin and geranylgeraniol. Single-step extractions of bixin using ethanol as a solvent were evaluated at various acoustic powers (4.6, 8.5, 14.5, and 20 W) and extraction times (0.5, 1, 3, and 5 min) to determine their impact on the yield of natural colorant extraction. Increasing the acoustic power from 4.6 to 20 W and extending the extraction time from 0.5 to 5 min resulted in higher yields of natural colorant, likely due to the effects of acoustic cavitation and increased heat under more intense conditions. However, elevated levels of mechanical and thermal energy did not affect the chemical properties of the colorant, as indicated by UV-Vis and FTIR spectra. Conversely, higher specific energies yielded colorants with a more intense red hue, consistent with increased bixin content, and altered the microstructure and physical state, as observed in X-ray diffractograms. Nevertheless, these alterations did not impact the solubility of the colorant. Therefore, employing a cleaner extraction procedure aided by one-step ultrasound facilitated the recovery of natural colorants and contributed to the biorefining of annatto seeds, enabling the production of a rich geranylgeraniol colorant through a sustainable approach.
Assuntos
Bixaceae , Carotenoides , Sementes , Ondas Ultrassônicas , Sementes/química , Bixaceae/química , Carotenoides/química , Carotenoides/isolamento & purificação , Fracionamento Químico/métodos , Diterpenos/química , Diterpenos/isolamento & purificação , Cor , Extratos VegetaisRESUMO
In order to understand antidiabetic potential and toxicity, this study aimed to evaluate the acute toxicity and antidiabetic activity of ethanolic extract and ethyl acetate fraction obtained from Coutoubea spicata "nicolau" shoots. Chemical constituents and acute toxicity were investigated. In alloxan-induced diabetic rats, extract and fraction were tested at dose of 100 mg/kg, p.o. Body weight gain, glucose, lipid profile and oxidative stress markers in serum and tissues were determined. In vitro antioxidant activity was performed. Swertiamarin, gentiopicrin, deoxyloganic acid, clovin and robinin, and their p-coumaric ester were identified. Extract and fraction were classified as safe (category 5). In diabetic rats, Coutoubea spicata reduced glycaemia, which was accompanied by body weight recovery gain and attenuation in oxidative stress markers. Fraction showed scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH), and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) radical (ABTS) radicals and reducing power higher than that of the extract. Extract and fraction of Coutoubea spicata didn't present significant toxicity and it can be investigated as a therapeutic alternative in diabetes.
Con el fin de conocer el potencial antidiabético y la toxicidad, este estudio tuvo como objetivo evaluar la toxicidad aguda y la actividad antidiabética del extracto etanólico y la fracción de acetato de etilo obtenidos de los brotes de Coutoubea spicata "Nicolau". Se investigaron los componentes químicos y la toxicidad aguda. En ratas diabéticas inducidas por alloxan, se probaron el extracto y la fracción en dosis de 100 mg/kg, p.o. Se determinó el aumento de peso corporal, la glucosa, el perfil lipídico y los marcadores de estrés oxidativo en suero y tejidos. Se realizó una actividad antioxidante in vitro. Se identificaron la suertiamarina, la gentiopicrina, el ácido desoxilogánico, la clovina y la robinina, así como su éster p-cumárico. El extracto y la fracción se clasificaron como seguros (categoría 5). En ratas diabéticas, Coutoubea spicata redujo la glicemia, lo que se acompañó de una recuperación del peso corporal y de la atenuación de los marcadores de estrés oxidativo. La fracción mostró una actividad de barrido contra los radicales 1,1-difenil-2-picrilhidrazilo (DPPH) y 2,2'-azino-bis (ácido 3-etilbenzotiazolina-6-sulfónico) y un poder reductor superior al del extracto. El extracto y la fracción de Coutoubea spicata no presentaron una toxicidad significativa y pueden ser investigados como alternativa terapéutica en la diabetes.
Assuntos
Extratos Vegetais/toxicidade , Extratos Vegetais/farmacologia , Diabetes Mellitus/tratamento farmacológico , Etanol/química , Extratos Vegetais/química , Fracionamento Químico , Hiperglicemia/tratamento farmacológicoRESUMO
Phytochemical bio-guided studies are used to find compounds with biological activity. Flavonoids from seeds of Leucaena species have antimicrobial activity in strains of medical interest, therefore, fresh seeds were collected from the town of Tlayacapan, Morelos, Mexico. The methanolic extracts were obtained by the maceration technique, targeted fractionation was performed using adsorption and molecular exclusion chromatographic techniques; to observe the antimicrobial activity, agar diffusion techniques were used; spectrometric and spectroscopic techniques were used for the characterization of D-pinitol, resulting from the fractionation of L. leucocephala. Antimicrobial activity was found on strains of Escherichia coli CUSI and Staphylococcus aureus ATCC 29213 of the most polar fractions, identifying the responsible compounds by HPLC: caffeic acid, gallic acid, p-coumaric acid, quercetin, catechin and apigenin, these compounds can inhibit the activation enzymatic, synthesis of nucleic acids and proteins, chelating with different ions, etc.
Los estudios biodirigidos fitoquímicos son empleados para encontrar compuestos con actividad biológica. Los flavonoides de semillas de especies de Leucaena son reportados por tener actividad antimicrobiana sobre cepas de interés médico, por tanto, se colectaron semillas frescas de la localidad de Tlayacapan, Morelos, México. Se obtuvieron los extractos metanólicos mediante la técnica de maceración, el fraccionamiento dirigido se realizó empleando técnicas cromatográficas de adsorción y exclusión molecular; la actividad antimicrobiana se determinó mediante técnicas de difusión en agar; se utilizaron técnicas espectrométricas y espectroscópicas para la caracterización del D-pinitol, resultado del fraccionamiento de L. leucocephala. Se encontró actividad antimicrobiana sobre cepas de Escherichia coli CUSI y Staphylococcus aureus ATCC 29213 de las fracciones más polares, identificando los compuestos responsables vía HPLC: ácido caféico, ácido gálico, ácido p-cumárico quercetina, catequina y apigenina, dichos compuestos pueden inhibir activación enzimática, síntesis de ácidos nucleicos y proteínas, quelarse con diferentes iones, etc.
Assuntos
Cromatografia/métodos , Fabaceae/química , Anti-Infecciosos/química , Plantas Medicinais/química , Fracionamento Químico , MéxicoRESUMO
This review addresses the possibilities of using supercritical carbon dioxide (SC-CO2) in the flavor industry in extraction and fractionation processes and its use as a reaction medium to generate aroma esters. The advantages and disadvantages are presented, comparing SC-CO2 processing with traditional methods. The most distinguishable features of SC-CO2 include mild reaction conditions, time savings, fewer toxicity concerns, higher sustainability, and the possibility of modulating solvent selectivity according to the process conditions (such as pressure and temperature). Thus, this review indicates the potential of using SC-CO2 to obtain a high selectivity of compounds that can be applied in aroma technology and related fields.
Assuntos
Dióxido de Carbono , Cromatografia com Fluido Supercrítico , Odorantes , Solventes , Tecnologia , Fracionamento Químico , Cromatografia com Fluido Supercrítico/métodosRESUMO
A solid phase chemical fractionation (SPCF) of the Mn in hot infusions prepared from commercial samples of roasted (RM) and green mate (GM) using a chelating resin Chelex 100 (NH4+ form) was performed to assess the relative lability of this essential trace element (ETE). In addition, total Mn contents in the RM and GM samples and their infusions were determined by flame atomic absorption spectrometry. Total polyphenol (TP) contents and the presence of soluble melanoidins (SM) were correlated with the Mn solubility in the RM and GM infusions. From the SPCF study, it was possible to observe that the soluble Mn forms in the mate infusions were essentially associated with relatively noninert chemical species (98.4-99.7%), suggesting that they may be potentially bioavailable. In addition, the soluble Mn contents in the GM infusions were 20.5% higher than those found in the RM. Mn solubility in the (RM) infusions was highly and directly correlated (r = 0.99) with the soluble TP, while in the GM infusions, it was high and inversely correlated with soluble TP (r = -0.87). On the other hand, Mn solubility in the RM and GM infusions was weakly correlated with the SM. It should be stressed that GM infusions can contribute with 57 and 44% more than the RM infusions to the recommended adequate intake of Mn established for females and males, respectively. Moreover, this work is the first to evaluate and compare the relative lability of Mn and its solubility in the RM and GM infusions.