Alginate based antioxidant films with yerba mate (Ilex paraguariensis St. Hil.): Characterization and kinetics of phenolic compounds release

Abstract Ilex paraguariensis, commonly known as yerba mate, is a tree species native to South America. Its commercial value is due to the manufacturing of teas, with potential also in the pharmacological and cosmetic industries. Vegetative propagation of yerba mate is considered an innovation to the traditional production systems based on sexual propagation. The present study aimed to evaluate the rhizogenic potential and chemical attributes of mini-cuttings from 15 yerba mate genotypes, as well as to verify the correlation between phytochemical and rooting-related variables. Mini-cuttings were collected from a pre-existing mini-clonal hedge and the experimental design was completely randomized, with 15 treatments (genotypes), four replications and 10 mini-cuttings per plot. After 120 days, mini-cuttings were assessed regarding rooting, mortality, callogenesis and leaf retention percentages, percentage of mini-cuttings with both calluses and roots, number of roots and average root length. At the time of collection, subsamples from each plot were used for phytochemical analyses including total phenolic compounds, protein, caffeine and theobromine contents and antioxidant activity. Rooting percentages ranged from 5 to 72.5%, with significant variation among genotypes. Adventitious rooting and phytochemical profile of yerba mate mini-cuttings are genotype-dependent. Leaf retention is a relevant factor in the rooting of yerba mate mini-cuttings and the levels of total phenolic compounds, antioxidants and theobromine present in mini-cuttings are negatively correlated components to Ilex paraguariensis adventitious rooting.

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Determination of total phenolic compounds in yerba mate (Ilex paraguariensis) combining near infrared spectroscopy (NIR) and multivariate analysis

LWT ◽

10.1016/j.lwt.2014.10.030 ◽

2015 ◽

Vol 60 (2) ◽

pp. 795-801 ◽

Cited By ~ 33

Author(s):

Cátia N.T. Frizon ◽

Gabrieli A. Oliveira ◽

Camila A. Perussello ◽

Patrício G. Peralta-Zamora ◽

Ana M.O. Camlofski ◽

...

Keyword(s):

Multivariate Analysis ◽

Infrared Spectroscopy ◽

Phenolic Compounds ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

Ilex Paraguariensis ◽

Total Phenolic ◽

Yerba Mate ◽

Total Phenolic Compounds

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Kinetics of aqueous extraction of phenolic compounds from processed yerba mate leaves

Revista de Ciencia y Tecnología ◽

10.36995/j.recyt.2021.36.004 ◽

2021 ◽

pp. 39-53

Author(s):

Gabriela G. López ◽

María M. Brousse ◽

María L. Vergara ◽

Adriana M. Gonzalez ◽

Nancy E. Cruz ◽

...

Keyword(s):

Phenolic Compounds ◽

Equilibrium Concentration ◽

Extraction Process ◽

Second Order ◽

Aqueous Extraction ◽

Percentage Error ◽

Yerba Mate ◽

Order Kinetic ◽

Diffusive Model ◽

Kinetics Of

In this study, the kinetics of aqueous extraction of phenolic compounds from the yerba mate leaves were analyzed. A temperature range between 40°C and 70°C and a ratio of 25 g of mate leaves in 200 mL of water were used. The extraction kinetic was studied adjustment of the kinetics models of first order, second order kinetic model and the second order diffusive model. The goodness of the fit was controlled by the magnitude of the coefficient of determination (R2), the percentage error (EP %) and the square root of the mean square error (RMSE).The second order kinetic models adequately described the extraction process, achieving the best fit with the second order diffusive model (EP%= 0,81 to 2,9; EP%= 11,24 to 14,99 and 4,72 and 6,92) that provided important information about the initial extraction process and the mechanism that occurs in the final extraction stage. The temperature influenced the kinetic parameters; however, the final equilibrium concentration of phenolic compounds was not affected by it. The results of this study allow us to obtain better overall knowledge of the times and temperatures for improved extraction rates and energy consumption for the industrialization of these compounds.

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Dimethoate degradation in plants and during processing of yerba maté leaves

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132002000600003 ◽

2002 ◽

Vol 45 (4) ◽

pp. 419-422 ◽

Cited By ~ 6

Author(s):

Miguel E. Schmalko ◽

Laura A. Ramallo ◽

Darío Ferreira ◽

Rubén D. Berlingheri

Keyword(s):

Gas Chromatography ◽

Half Life ◽

Degradation Kinetics ◽

Life Time ◽

Ilex Paraguariensis ◽

Yerba Mate ◽

Initial Value ◽

Mass Selective Detector ◽

Selective Detector ◽

Kinetics Of

The objective of this research was to study degradation kinetics of dimethoate in plants of Ilex paraguariensis Saint Hilaire (or yerba maté) and during its processing. To determine dimethoate concentration, a capillary gas chromatography technique with a mass selective detector was used. Half-life times in plants ranked between 9.8 and 11.8 days. During processing, with a blanching and two drying steps, dimethoate concentration decayed to a 22.7% of its initial value (in dry basis); while during seasoning step (at 45°C), half-life time was 17.3 days. With these values, preharvest safety interval was determined.

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PERSISTÊNCIA NO SOLO DE INÓCULO DE Beauveria bassiana EMPREGADO PARA O CONTROLE DE Hedypathes betulinus EM PLANTIO DE Ilex paraguariensis

FLORESTA ◽

10.5380/rf.v41i1.21194 ◽

2011 ◽

Vol 41 (1) ◽

Author(s):

Larissa Rolim Borges ◽

Sônia Maria Noemberg Lazzari ◽

Ida Chapaval Pimentel ◽

Lívia Cardoso Bueno de Camargo ◽

Lílian Mattos Kalinoski

Keyword(s):

Beauveria Bassiana ◽

Entomopathogenic Fungus ◽

Abiotic Factors ◽

Agricultural Practices ◽

Control Measures ◽

Ilex Paraguariensis ◽

Natural Occurrence ◽

Yerba Mate ◽

Santa Catarina ◽

Wood Borer

O controle da broca-da-erva-mate, Hedypathes betulinus, limita-se ao emprego de práticas silviculturais e catação manual dos insetos adultos, não sendo permitido o uso de inseticidas químicos na cultura. Esta pesquisa teve por objetivos verificar a presença natural de Beauveria bassiana no solo de plantio em monocultura de erva-mate, determinar a persistência de B. bassiana no solo após duas e três aplicações do fungo e averiguar a influência de fatores abióticos na estabilidade do fungo no solo. O estudo foi conduzido em um erval no município de Campo Alegre, Santa Catarina, Brasil, onde foram coletadas amostras de solo em duas áreas, para avaliação da presença natural de inóculos do fungo B. bassiana, procedendo-se à contagem, isolamento e identificação.Não foi detectada a ocorrência natural do fungo no solo em nenhuma das duas áreas. Após essa confirmação, foram realizadas pulverizações com B. bassiana em ambas as áreas, sendo que em uma ocorreram duas e na outra três aplicações. Após a última pulverização, realizada em fevereiro/2006, verificou-se que os inóculos do fungo persistiram por 90 dias na área com duas aplicações e 120 dias na área com três aplicações. A temperatura afetou a persistência do fungo no solo em ambas as áreas, mas a umidade relativa não mostrou influência sobre os inóculos em campo.Palavras-chave: Broca-da-erva-mate; controle biológico; epizootia; fungo entomopatogênico. AbstractPersistence in soil of inoculum of Beauveria bassiana used to control Hedypathes betulinus in yerba maté plantation, Ilex paraguariensis. Control measures of Hedypathes betulinus are restricted to agricultural practices and hand picking of adult insects. No chemical control is allowed in yerba maté cultivation areas. The objectives of this research were to verify the natural occurrence of the entomopathogenic fungus Beauveria bassiana in the soil of yerba maté in monoculture; to determine the persistence of inoculums in the soil after applications of the fungus; and to evaluate the influence of abiotic factors on fungus stability in the soil. The soil samples were taken from two experimental areas in a yerba maté plantation in the county of Campo Alegre, Santa Catarina, Brazil. The samples were analyzed in order to count, isolate and identify inoculums of B. bassiana and other fungi. After the confirmation that B. bassiana was not present in the soil, a suspension of the fungus was applied, twice in one of the areas and three times in the other. After the last application in February/2006, the inoculum persisted for 90 and 120 days, in the area with two and three applications, respectively. The temperature affected the persistence of B. bassiana in soil; however, the relative humidity did not.Keywords: Biological control; epizooty; entomopathogenic fungus; wood borer.

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