Studies on polyphenols and lignin of Astronium urundeuva wood

Morais, Sérgio Antônio Lemos de; Nascimento, Evandro A.; Queiroz, Carla R.A.A.; Piló‐Veloso, Dorila; Drumond, Mariza G.

doi:10.1590/s0103-50531999000600005

Cited by 37 publications

(38 citation statements)

References 15 publications

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“…Th is species has high concentrations of phenolic compounds, especially tannins, and a number of studies have demonstrated the therapeutic qualities of these compounds (Chaves et al 1998;Morais et al 1999;Queiroz et al 2002;Viana et al 2003;Monteiro et al 2006). Dimeric chalcones isolated from M. urundeuva Allemão showed analgesic and anti-infl ammatory activities in rats (Viana et al 2003).…”

Section: The "Wilderness Aroeira" (Myracrodruon Urundeuva Allemão)mentioning

confidence: 99%

Valuation of the Aroeira (Myracrodruon urundeuva Allemão): perspectives on conservation

et al. 2012

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Valuation of the Aroeira (Myracrodruon urundeuvaAllemão ABSTRACT(Valuation of the aroeira (Myracrodruon urundeuva Allemão): Perspectives on conservation). Assigning an economic value to a given environmental asset has helped conservation proposals, and valuing these assets at levels comparable to market rates facilitates the establishment of environmental policies. Th us, this research aimed to assess the value of the species Myracrodruon urundeuva Allemão, using the method of contingent valuation to determine the maximum willingness to pay of frequent visitors to the Caruaru Fair, located in northeastern Brazil. Our results show that most interviewees agreed to participate in proposals to support species conservation, although the average willingness to pay (WTP) was relatively low compared to other surveys conducted in Brazil. However, a signifi cant number of the interviewees had exceptionally low monthly incomes. Another relevant aspect of this research was the high number of people (98.5% of the informants) who were concerned about biodiversity conservation; many interviewees stated that the preservation of biodiversity is not a duty exclusive to the government or the people but rather a collective responsibility. Th erefore, these fi ndings may encourage the provision of public proposals for environmental conservation, along with other surveys or government actions funded by a society that has the willingness to pay for them. Th is study is the fi rst economic valuation of a caatinga species, many of which are under threat of extinction.

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Section: The "Wilderness Aroeira" (Myracrodruon Urundeuva Allemão)mentioning

confidence: 99%

Valuation of the Aroeira (Myracrodruon urundeuva Allemão): perspectives on conservation

et al. 2012

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“…Para quantificar taninos condensados os métodos mais utilizados são o butanol-HCl e o vanilina 32,35,36 . De acordo com Schofield e colaboradores 32 , o método vanilina depende da reação da vanilina com os taninos condensados para formação de complexos coloridos.…”

Section: Determinação Do Teor De Taninosunclassified

Taninos: uma abordagem da química à ecologia

et al. 2005

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. Prof. Nelson Chaves, s/n, 50670-901 Recife -PE Recebido em 31/3/04; aceito em 19/1/05; publicado na web em 13/4/05 TANNINS: FROM CHEMISTRY TO ECOLOGY. Tannins are compounds of great interest in chemistry and ecology. They have various effects on food digestibility and the performance of animals. In this work, the chemistry, the biological activity and the ecology of tannins are examined. A brief discussion of several analytical methods for the determination of tannins is presented.Keywords: tannins; colorimetric assay; biological activity. INTRODUÇÃOOs compostos do metabolismo secundário vegetal ou metabolismo especial apresentam um amplo valor nas interações entre a planta e seu ecossistema exercendo, por ex., o papel de fagoinibidores contra herbívoros ou como agentes antimicrobianos 1 . Como metabólitos secundários, os taninos são compostos fenólicos de grande interesse econômico e ecológico. Apresentam solubilidade em água e peso molecular compreendido entre 500 e 3000 Dalton, possuindo a habilidade de formar complexos insolúveis em água com proteínas, gelatinas e alcalóides 2 . Tais compostos são responsáveis pela adstringência de muitos frutos e produtos vegetais, devido à precipitação de glucoproteínas salivares, o que ocasiona a perda do poder lubrificante 3 .A ligação entre taninos e proteínas ocorre, provavelmente, através de pontes de hidrogênio entre os grupos fenólicos dos taninos e determinados sítios das proteínas, emprestando uma duradoura estabilidade a estas substâncias. Para a formação destas ligações é necessário que o peso molecular dos taninos esteja compreendido entre limites bem definidos; se este é demasiadamente elevado, a molécula não pode se intercalar entre os espaços interfibrilares das proteínas ou macromoléculas; se é muito baixo, a molécula fenólica se intercala, mas não forma um número suficiente de ligações que assegure a estabilidade da combinação 3 . Os taninos têm sido alvo de diversos estudos, sendo que a maioria vem abordando interações ecológicas entre vegetais e herbívoros, visto que se têm sugerido que os teores de taninos podem diminuir a taxa de predação por se tornarem impalatáveis, afastando seus predadores naturais 4-8 . Pesquisas sobre atividade biológica dos taninos evidenciaram importante ação contra determinados microrganismos 4 , como agentes carcinogênicos e causadores de toxicidade hepática 9 . Estes últi-mos efeitos, sem dúvida, dependem da dose e do tipo de tanino ingerido. A ingestão de chá verde e de dietas ricas em frutas que contêm taninos, por ex., tem sido associada com atividade anticarcinogênica 9 . Além disso, podem agir como antiinflamatórios e cicatrizantes 2 , e até como inibidores da transcriptase reversa em HIV 10 .Alguns trabalhos têm tratado do aspecto antinutricional de cultivares com altos teores de taninos e sua resistência a pragas 11,12 . Outros trabalhos têm avaliado a influência de diferentes variáveis nos teores de taninos em espécies de interesse econômico 13,14 . A sazonalidade tem sido apontada como um interessante fator para a...

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“…The supply of nutrients derived from the leaves, twigs, fruits, and flowers by release some minerals through the decomposition process [17]. The transfer of organic material in vegetation through a decomposition process was determined by the amount and quality of the litter [18]. The fast-decomposed of litter play an important role to improve nutrient cycle in soil.…”

Section: Discussionmentioning

confidence: 99%

Litter Decomposition Rate of Karst Ecosystem at Gunung Cibodas, Ciampea Bogor Indonesia

Sari

Qayim

Hilwan

2016

JTLS

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The study aims to know the productivity of litter and litter decomposition rate in karst ecosystem. This study was conducted on three altitude of 200 meter above sea level (masl), 250 masl and 300 masl in karst ecosystem at Gunung Cibodas, Ciampea, Bogor. Litter productivity measurement performed using litter-trap method and litter-bag method was used to know the rate of decomposition. Litter productivity measurement results showed that the highest total of litter productivity measurement results was on altitude of 200 masl (90.452 tons/ha/year) and the lowest was on altitude of 300 masl (25.440 tons/ha/year). The litter productivity of leaves (81.425 ton/ha/year) showed the highest result than twigs (16.839 ton/ha/year), as well as flowers and fruits (27.839 ton/ha/year). The rate of decomposition was influenced by rainfall. The decomposition rate and the decrease of litter dry weight on altitude of 250 masl was faster than on the altitude of 200 masl and 300 masl. The dry weight was positively correlated to the rate of decomposition. The lower of dry weight would affect the rate of decomposition become slower. The average of litter C/N ratio were ranged from 28.024%--28.716% and categorized as moderate (>25). The finding indicate that the rate of decomposition in karst ecosystem at Gunung Cibodas was slow and based on C/N ratio of litter showed the mineralization process was also slow.

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Studies on polyphenols and lignin of Astronium urundeuva wood

Cited by 37 publications

References 15 publications

Valuation of the Aroeira (Myracrodruon urundeuva Allemão): perspectives on conservation

Valuation of the Aroeira (Myracrodruon urundeuva Allemão): perspectives on conservation

Taninos: uma abordagem da química à ecologia

Litter Decomposition Rate of Karst Ecosystem at Gunung Cibodas, Ciampea Bogor Indonesia

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