Essential oils from leaves of various species: antioxidant and antibacterial properties on growth in pathogenic species

Abstract

RESUMO -Os óleos essenciais apresentam possibilidade de serem empregados nas indústrias de alimentos, bebidas, produtos de higiene pessoal e cosméticos para evitar ou reduzir a deterioração lipídica e a contaminação por micro-organismos. ABSTRACT -Essential oils can be employed in the food, drinks, toiletry and cosmetics industries to prevent or reduce lipid deterioration and contamination by microorganisms. The aim of this work was to evaluate the functional antimicrobial and antioxidant properties of essential oils of fresh leaves from Coniza bonariensis, Parthenium hysterophorus, Tithonia diversifolia, Ambrosia polystachya, Hedychium coronarium and Baccharis dracunculifolia, extracted by hydrodistillation. The methodologies used for assessing antioxidant potential were consumption of the DPPH radical and oxidation inhibition of the -carotene/linoleic acid system. Sensitivity of the bacteria Salmonella cholerasuis, Listeria monocytogenes, Staphylococcus aureus and Escherichia coli to the essential oils was determined using the agar-well diffusion method. The essential oils were noteworthy for their high terpenoid content. None of the essential oils assessed by DPPH radical sequestration presented significant IC 50 . Using -carotene/linoleic acid methodology, the essential oils of T. diversifolia and H. coronarium showed no significant activity, and C. bonariensis, P. hysterophorus, A. polystachya and B. dracunculifolia showed IC 50 greater than the highest concentration evaluated. The essential oils of C. bonariensis, T. diversifolia, H. coronarium and B. dracunculifolia displayed antibacterial activity for gram-negative and grampositive bacteria, with the exception of the volatile oil of P. hysterophorus, which did not inhibit growth in any of the bacterial strains tested. The essential oil of A. polystachya displayed antibacterial activity only for strains of S. aureus.

Controle de qualidade físico-químico e caracterização fitoquímica das principais plantas medicinais comercializadas na feira-livre de Lagarto-SE

“…Outros estudos encontraram resultados parecidos com o dessa pesquisa, contudo os autores destacam a variabilidade do teor e compostos encontrados devido as formas extrativas utilizadas [17,18]. Esta erva medicinal está entre as principais plantas medicinais utilizadas pela população do munícipio de Lagarto conforme estudo de Caetano e colaboradores (2015) [10].…”

“…O que pode ser devido aos constituintes do metabolismo secundário que podem variar a depender dos fatores extrínsecos e intrínsecos, como solo, temperatura, água disponível, genética da espécie e metabolismo [8,18].…”

Vermicomposting transforms allelopathic parthenium into a benign organic fertilizer

“…Equally futile have been the attempts to find ways for gainfully utilizing parthenium. Even though a large number of options have been explored d for making parthenium a source of biopesticides (Datta and Saxena, 2001;Sreekanth, 2013;, green manure (Kishor et al, 2010;Kumar et al, 2012), energy (Patel, 2011;Singh and Garg, 2014;Tavva et al, 2016), essential oils (Miranda et al, 2016); drugs (Kumar et al, 2014a,b;Anwar et al, 2015;Singh and Beck, 2006), and nanoparticles (Abbasi et al, 2015a,b) d none of the methods has had economic viability. As a result, billions of tonnes of parthenium biomass that is generated annually across the world, remains unutilized.…”

Antibacterial action of the essential oil from Cantinoa carpinifolia benth. Against Escherichia coli and Staphylococcus aureus strains

“…As a reflection of its protective function, the essential oils have numerous biological properties that stand out in the food industry, and these properties are being increasingly explored by the different industrial branches . The antibacterial effect of the essential oil is reported in the literature by several authors, and some studies attribute the antibacterial potential of the essential oils to the lipophilic action of their constituents, which allows them to interact with the bacterial membrane to promote its expansion, increase its fluidity and permeability, trigger disorders in the proteins present in the membrane, inhibit respiration, alter the ion‐transport processes, and cause lysis of the cell …”

“…4 The antibacterial effect of the essential oil is reported in the literature by several authors, and some studies attribute the antibacterial potential of the essential oils to the lipophilic action of their constituents, which allows them to interact with the bacterial membrane to promote its expansion, increase its fluidity and permeability, trigger disorders in the proteins present in the membrane, inhibit respiration, alter the ion-transport processes, and cause lysis of the cell. [5][6][7][8][9] Among the species producing essential oils, Cantinoa carpinifolia Benth deserves attention. Popularly known as rosman, it is a branched shrub that belongs to the family Lamiaceae.…”