Lecanoric acid, a secondary lichen substance with antioxidant properties from Umbilicaria antarctica in maritime Antarctica (King George Island)

Luo, Hui; Yamamoto, Yoshikazu; Kim, Jung A; Jung, Jae Sung; Koh, Young Jin; Hur, Jae‐Seoun

doi:10.1007/s00300-009-0602-9

Cited by 76 publications

(45 citation statements)

References 26 publications

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“…The presence of compounds with antioxidant activity in the crude extracts was determined, on a qualitative basis using the method of Chaaib (Chaaib et al, 2003) with modifications by Luo et al (2009). The extracts were solubilized in acetone (1 mg.ml -1 ), deposited directly into a normal phase silica chromatography plates for hexane and ethyl acetate extracts or a reverse-phase chromatography plate for aqueous extracts, and then eluted with different solvents according to the polarity of the compounds evaluated.…”

Section: Bioautography In Thin Layer Chromatographymentioning

confidence: 99%

Antioxidant activity and phenol content of extracts of bark, stems, and young and mature leaves from Blepharocalyx salicifolius (Kunth) O. Berg

et al. 2016

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Phenolic compounds are a group of plant secondary metabolites known to have a variety of bioactivities, including the ability to function as antioxidants. Because of the side effects of the use of synthetic substances, the search for natural and less toxic compounds has increased significantly. This study was designed to evaluate the antioxidant activity and phenol content of hexane, ethyl acetate, and aqueous extracts of the bark (suber) and stems as well as the young and mature leaves of Blepharocalyx salicifolius. The extracts were obtained by extraction with organic solvents and subsequent fractionation by chromatographic partition coefficient. Preliminary tests for the presence of antioxidants were performed using bioautography in thin-layer chromatography. The antioxidant activity of the extracts was assessed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method, and the phenol content of the extracts was quantified using the Folin-Ciocalteu technique. The results showed that 9 of the 12 extracts evaluated displayed very strong antioxidant activity and three displayed moderate activity. Aqueous extracts of the young leaves and bark and the ethyl acetate extract of the young leaves showed the highest levels of antioxidant activity and total phenolic content (TPC). A correlation was observed between TPC and antioxidant activity index (AAI) with a correlation coefficient (r 2 ) of 0.7999. Thus, the high phenol content of B. salicifolius extracts and its correlation with antioxidant activity provide substrates for further studies.Keywords: bioactivity, Brazilian Savana (Cerrado), leaf maturation stage, Myrtaceae, scavenging free radicals.Atividade antioxidante e teor de polifenóis de extratos de cascas (súber), caule, folhas jovens e folhas maduras de Blepharocalyx salicifolius (Kunth) O. Berg (Murta) ResumoOs polifenóis são um grupo de metabólitos secundários vegetais que possuem uma variedade de bioatividades conhecidas, dentre elas a capacidade de funcionar como antioxidantes. Devido aos efeitos colaterais do uso excessivo de substâncias sintéticas, a busca por compostos naturais e menos tóxicos têm aumentado significativamente. Esse estudo teve por objetivo avaliar a atividade antioxidante e o teor de polifenóis dos extratos hexânicos, acetato de etila e aquosos de cascas (súber), caules, folhas jovens e folhas maduras de Blepharocalyx salicifolius. Os extratos foram obtidos por meio de extração com solventes orgânicos e subsequente fracionamento em cromatografia por coeficiente de partição. Testes preliminares da presença de compostos com atividade antioxidante foram realizados por meio de bioautografia em cromatografia de camada delgada. Os extratos foram submetidos ao teste da capacidade sequestrante do radical 2,2-difenil-1-picrilhidrazil (DPPH) para quantificação da atividade antioxidante e submetidos ao teste com o reagente de Folin-Ciocalteu para quantificação dos polifenóis. Os resultados mostraram que dos 12 extratos avaliados, 9 apresentaram atividade antioxidante muito forte e 3 atividad...

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Section: Bioautography In Thin Layer Chromatographymentioning

confidence: 99%

Antioxidant activity and phenol content of extracts of bark, stems, and young and mature leaves from Blepharocalyx salicifolius (Kunth) O. Berg

et al. 2016

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“…36 . On the other hand, Luo et at 37 showed that acetone extracts from Antarctic lichen species had higher antioxidant properties than methanol extracts. Caloplaca regalis contains bioactive compounds, which have immunomodulatory effect on the macrophages in vitro 38 .…”

Section: Resultsmentioning

confidence: 99%

“…Caloplaca regalis contains bioactive compounds, which have immunomodulatory effect on the macrophages in vitro 38 . Umbilicaria antarctica was found to be the lichen species with potent antioxidative capacity 37 . Furthermore, Paudel et al 39 showed that extracts from Antarctic lichens have strong antibacterial potential against human pathogenic bacteria.…”

Section: Resultsmentioning

confidence: 99%

Prenyllipids and Pigments Content in Selected Antarctic Lichens and Mosses

Strzałka

Szymańska

Suwalsky

2011

J. Chil. Chem. Soc.

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The content and relative composition of tocopherols, plastochromanol, plastoquinone and pigments in fifteen Antarctic species (five mosses and ten lichens) were analyzed by HPLC. Total tocopherols in mosses ranged from 90 mg/g (Warnstrofia sarmentosa) to 220 mg/g (Syntrichia magellanica), while in lichens it ranged from 0.89 mg/g in Caloplaca sp. to 45 mg/g in Placopsis contortuplicata. With the exception of Ochrolechia frigida, in all other mosses and lichens species, a-tocopherol accounted for more than 90% of total tocopherols. Plastochromanol was detected in four mosses and two lichen species; the highest level was found in Polytrichastrum alpinum (19.1 mg/g). The highest content of plastoquinone-9 (PQ-9) in mosses was found in Bryum pseudotriquetrum (42.6 mg/g), whereas in lichens it was 24.5 mg/g in Stereocaulon alpinum, and 23.17 mg/g in Umbilicaria antarctica. Pigment composition in mosses was typical for higher plants. Some lichen species lacked chlorophyll b, violaxanthin and b-carotene. Based on these results it is suggested that tocochromanols and carotenoid pigments are involved in the protection of mosses and lichens against the oxidative stress caused by the extreme Antarctic conditions.

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“…Secondary metabolites have also been hypothesized to play a role in herbivory defence, antibiotics, or as metal chelators for nutrient acquisition (Gauslaa, 2005;Lawrey, 1986, Huneck, 1999. Recently it was hypothesized that polyketides play a role in protection against oxidative stress in fungi (Luo et al, 2009;Reverberi et al, 2010) and that some metabolites such as fumarprotocetraric acid, perlatolic, and thamnolic acids contribute to the ability of lichens to tolerate acid rain events and consequences (Hauck, 2008;Hauck et al, 2009). One explanation for high levels and numbers of secondary metabolites in lichen fungi is the slow growth of the lichen.…”

Section: Hypothesized Roles Of Secondary Metabolite Productionmentioning

confidence: 99%

Effect of Environmental Change on Secondary Metabolite Production in Lichen-Forming Fungi

Deduke¹,

Timsina²,

Piercey‐Normore³

2012

International Perspectives on Global Environmental Change

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Lecanoric acid, a secondary lichen substance with antioxidant properties from Umbilicaria antarctica in maritime Antarctica (King George Island)

Cited by 76 publications

References 26 publications

Antioxidant activity and phenol content of extracts of bark, stems, and young and mature leaves from Blepharocalyx salicifolius (Kunth) O. Berg

Antioxidant activity and phenol content of extracts of bark, stems, and young and mature leaves from Blepharocalyx salicifolius (Kunth) O. Berg

Prenyllipids and Pigments Content in Selected Antarctic Lichens and Mosses

Effect of Environmental Change on Secondary Metabolite Production in Lichen-Forming Fungi

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