Comparación del contenido de compuestos fenólicos en la corteza de ocho especies de pino

Abstract

RESUMENSe evaluó el contenido de taninos condensados y fenoles totales, expresados como ácido tánico, en extractos etanólicos y acuosos de las cortezas de ocho especies de pino abundantes en el estado de Durango. Los extractos etanólicos se obtuvieron por maceración durante 48 h con etanol acuoso al 50 % y los acuosos con agua, a ebullición y reflujo. La evaluación de taninos condensados se realizó mediante el número de Stiasny y los fenoles totales se evaluaron por el método de Folín-Ciocalteu utilizando ácido tánico como estándar. Los rendimientos en extracto o sólidos totales extraídos, Stiasny, taninos condensados y fenoles fueron mayores en los extractos etanólicos que en los acuosos, en todas las especies. Se encontraron diferencias estadísticas en la concentración de compuestos fenólicos entre los solventes de extracción utilizados y entre las especies. Los extractos etanólicos de las cortezas de Pinus leiophylla, P. ayacahuite, P. durangensis y P. teocote presentaron la mayor concentración de taninos condensados y fenoles, mientras que las especies P. cooperi y P. engelmannii presentaron la menor concentración.PALABRAS CLAVE: Corteza de pino, fenoles totales, Folín-Ciocalteu, taninos condensados, Stiasny. ABSTRACTCondensed tannins and total phenols content expressed as tannic acid were evaluated on ethanolic and aqueous extracts from bark of eight Pinus species abundant at Durango State forests. Ethanolic extracts were obtained by soaking bark 48 h with 50 % aqueous ethanol and the aqueous extracts with hot water. Condensed tannins were evaluated by the Stiasny number and total phenols by the Folín-Ciocalteu method. Extract yields, Stiasny number, condensed tannins and total phenols were higher in ethanolic extracts, for all species. Statistical differences were found between extraction solvents and species. Ethanolic extracts of P. leiophylla, P. ayacahuite, P. durangensis and P. teocote barks showed the highest concentration of condensed tannins and phenols, while P. cooperi and P. engelmannii showed the lowest.

Chemical composition of biomass generated in the guava tree pruning

“…The Stiasny number indicates a relatively high content of proantocyanidins or condensed tannins reagents (Wissing, 1955[ 40 ]), which may be reacted with formaldehyde in acidic medium (Yazaki and Hillis, 1980[ 42 ]; Yazaki et al, 1993[ 41 ]). In general, the results of Stiasny number reported for others lignocellulosic materials (Rosales Castro and González Gaona, 2003[ 31 ]; Colín-Urieta et al, 2013[ 10 ]) are in the range for the values obtained in this work.…”

“…It clearly shows that the total extract content is higher in leaves compared with branches. These values are slightly higher than those reported for other lignocelullosic materials (Rosales Castro and González Gaona, 2003[ 31 ]; Colín-Urieta et al, 2013[ 10 ]).…”

Physicochemical Characterization of Water Hyacinth (Eichhornia crassipes (Mart.) Solms)

“…The amount of condensed tannins (T) in roots and leaves in our study ranged from 5.4 by aqueous to 6.9 wt.% by ethanolic extraction. This content is higher compared to that reported for leaves (0.98%) in E. crassipes (Saha and Ray 2011) or similar to that found in the bark of Pinus leiophylla (5.8%), Pinus durangensis (6.4%) (Rosales and González 2003), and in the bark of Erythroxylon compactum (5.6%) (Colín et al 2013). However, the tannin content in E. crassipes was lower than the value reported as suitable for commercial potential (Colín-Urieta et al 2013).…”

“…The values for total extract (TE) ranged from 12.1 in roots to 15.7 wt.% in leaves, using ethanol and water as solvents, respectively. These values are slightly higher than those reported for the barks of some pine species (Rosales and González 2003) and in the range for those reported for barks of other hardwood species: 11.1 wt.% for Erythroxylon compactum and 17.7 wt.% for Senna skinneri (Colín-Urieta et al 2013).…”

Germinación y multiplicación in vitro de Matricaria recutita L.: los fenoles totales determinan su germinación

“…Los análisis de fenoles totales se realizaron por el método de Folin-Ciocalteu, citado por Jordán, (1975), utilizando ácido tánico como estándar (Rosales-Castro and González-Laredo, 2003). Por cada periodo de almacenamiento se evaluó el contenido de fenoles totales de 30 semillas por repetición, con un total de dos repeticiones.…”