Antioxidant capacity and phenolic composition of different woods used in cooperage

This study has investigated the antioxidant capacity of different woods used in cooperage and the effect of the botanical species of wood on this capacity. Quercus robur and Castanea sativa were the species with the highest antioxidant capacity, due to their relatively high content of phenolic compounds. However, the phenolic content of Prunus avium samples was very low, also reflected in its antioxidant capacity. All measurements of antioxidant capacity were consistent with the content and composition of the phenolic compounds detected in the wood samples. The major contributors to the antioxidant capacity were identified as phenolic acids, including gallic, protocatechuic, p-coumaric and ellagic acid and all the ellagitannins, due to their characteristic structure.

Sugarcane spirit extracts of oak and Brazilian woods: antioxidant capacity and activity

Sugarcane spirit extracts of six different Brazilian woods for potential use in manufacturing aging casks were compared with similar extracts of five oak samples from different geographic origin and heat treatment regarding: (1) content of phenolics and copper; (2) radical reducing capacity and reactivity toward 2,2-diphenyl-1-picrylhydrazyl radical (DPPH center dot); and (3) effect on the rate of oxygen depletion rate in a peroxidating lipid model system. Total phenolic contents of the Brazilian wood extracts ranged from 0.65 (canela-sassafras) to 6.4 (jatoba) mmol(GAE) L(-1) and from 1.39 to 2.87 mmol(GAE) L(-1) for oak extracts. Flavonoids ranged from 1.54 x 10(-4) (ipe) to 6.5 x 10(-2) (oak) mmol(rutin) L(-1), and tannins from below the detection limit to 0.22 (jatoba) mmol(tannic acid) L(-1). Correlation was observed for the antioxidant capacity versus phenolics/flavonoids/tannins content, where oak extracts exhibit the highest radical scavenging capacity compared to Brazilian woods. Rate constant for radical scavenging by the extracts ranged from 4.9 x 10(3) M(-1) s(-1)(canela-sassafras) to 9.7 x 10(4) M(-1) s(-1) (oak). The oxygen consumption index showed the Brazilian woods amendoim and jatoba to be more efficient inhibitors than the oak extracts for lipid autoxidation initiated by metmyoglobin, despite that the oak extracts seem to be more efficient to scavenge DPPH center dot. No simple correlation with phenolics or copper content could be established, and a prooxidative tendency was observed for the extracts of canela-sassafras, castanheira, and louro-canela.

Coumarins and phenolic fingerprints of oak and Brazilian woods extracted by sugarcane spirit

A total of 25 sugarcane spirit extracts of six different Brazilian woods and oak, commonly used by cooperage industries for aging cachaca, were analyzed for the presence of 14 phenolic compounds (ellagic acid, gallic acid, vanillin, syringaldehyde, synapaldehyde, coniferaldehyde, vanillic acid, syringic acid, quercetin, trans-resveratrol, catechin, epicatechin, eugenol, and myricetin) and two coumarins (scopoletin and coumarin) by HPLC-DAD-fluorescence and HPLC-ESI-MS(n). Furthermore, an HPLC-DAD chromatographic fingerprint was build-up using chemometric analysis based on the chromatographic elution profiles of the extracts monitored at 280 nm. Major components identified and quantified in Brazilian wood extracts were coumarin, ellagic acid, and catechin, whereas oak extracts shown a major contribution of catechin, vanillic acid, and syringaldehyde. The main difference observed among oak and Brazilian woods remains in the concentration of coumarin, catechin, syringaldehyde, and coniferaldehyde. The chemometric analysis of the quantitative profile of the 14 phenolic compounds and two coumarins in the wood extracts provides a differentiation between the Brazilian wood and oak extracts. The chromatographic fingerprint treated by multivariate analysis revealed significant differences among Brazilian woods themselves and oak, clearly defining six groups of wood extracts: (i) oak extracts, (ii) jatoba extracts, (iii) cabreuva-parda extracts, (iv) amendoim extracts, (v) canela-sassafras extracts and (vi) pequi extracts.

Interview with Leonard Hewell "Kip" Carter

In his February 10, 2012 interview with Robert Ryals, Leonard Hewell “Kip” Carter details growing up in the South during segregation and the Civil Rights Movement, as well as his life as political aide/campaign treasurer to Newt Gingrich. Included are details of his college education at UNC-Chapel Hill – classes, professor, and the Red Scare. Carter shares the history of his friendship and working relationship with Newt Gingrich, the scandals Gingrich faced, and the ultimate end of their relationship. This interview was conducted for inclusion into the Louise Pettus Archives and Special Collections Oral History Program.

Architecture at RISD: An Exhibition of Work, Woods-Gerry Gallery, Providence, Rhode Island, February 5-21, 1999

Postcards advertising a show of student architecture work at Woods-Gerry.

The Great Woods, Bristol County, Massachusetts: A Design with Nature

A poster of the front cover for the publication prepared by the RISD Department of Landscape Architecture.

A política cambial brasileira durante a vigência do acordo de Bretton Woods : 1945-1973

O tema central deste trabalho é a política cambial. Seu objetivo básico é analisar a condução da política cambial no Brasil entre 1945-1973, que compreende a vigência do Acordo de Bretton Woods, identificando as principais medidas adotadas e seus efeitos sobre algumas das principais variáveis econômicas. Ainda que o Acordo de Bretton Woods tenha estabelecido o dólar norte-americano como base do sistema monetário mundial, de forma que cada país deveria adotar uma taxa fixa de câmbio em relação ao dólar-norte americano, verificou-se, especialmente após a Segunda Guerra Mundial, a utilização freqüente de alternância de instrumentos de política cambial pelo governo brasileiro. Dessa forma, ficou evidenciado que durante o período mencionado, a política cambial, esteve em grande parte, subordinada à gestão de freqüentes estrangulamentos cambiais, decorrentes da necessidade de equilibrar as contas externas ou de fornecer divisas à importação dos bens de produção necessários à continuidade do desenvolvimento industrial. Tais fatos, levavam o governo brasileiro a adotar medidas intercaladas de controle cambial, ora austeras, ora mais flexíveis, para fazer frente a tais desequilíbrios. Em 1973, o Acordo de Bretton Woods ruiu e desta forma o sistema monetário internacional passou a adotar taxas de câmbio flexíveis. No entanto, o Brasil já vinha praticando uma política cambial mais flexível desde 1968, com base em minidesvalorizações cambiais, levando em consideração a variação da paridade do poder de compra. À guisa de conclusão, evidenciou-se que a política cambial teve importância crucial, constituindo-se num marco decisivo no processo de desenvolvimento econômico do país, durante o período analisado, procurando, em conjunturas específicas, compatibilizar a estabilidade econômica com os compromissos desenvolvimentistas assumidos pelos governos do período.

Physical and chemical changes in juvenile and mature woods of Pinus elliottii var. elliottii by thermal modification

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)