Variation of the phenolic composition and a-glucosidase inhibition potential of seeds, soaked seeds, and sprouts of four wild forms and four varieties of common bean (Phaseolus vulgaris)

The determination of the changes in the composition of bioactive phenolic compounds of germinating seeds which accumulate high levels of these compounds could contribute to the understanding of the germination mechanism and the development of markers for the selection of plant genotypes. In the current study, the changes in the phenolic composition and a-glucosidase inhibition activity, taking place during the germination of four wild forms and four varieties of common bean (Phaseolus vulgaris L.) from Durango Mexico, were determined. A total of 66 phenolic compounds (19 phenolic acids, 18 isoflavones, 18 flavonol glycosides, 3 flavonol aglycones, 3 flavones, 2 dihydroflavonoids, 2 chalcones and one non-identified type) were found by HPLC-DAD, which were differentially accumulated by the seeds, 24 h-soaked seeds, and 4 day-sprouts of each genotype. The accumulation of the flavonol aglycones, myricetin, quercetin and kaempferol was distinctive of the wild seeds. Soaking not only caused leaching and degradation but also triggered the synthesis of new phenolic compounds whereas germination diversified the composition of isoflavones and flavonol glycosides. The seeds of all genotypes analyzed were important inhibitors of a-glucosidase, improving their potential after soaking and germination. The results suggested that the structure rather than the concentration of the flavonoids and phenolic acids determined the inhibitory potential of a-glucosidase of samples. The principal component analysis and cluster analysis revealed HPLC-DAD phenolic profiles as genotype-specific chemomarkers at any of the states (seeds, soaked seeds, and sprouts). The results have wide implications on agronomy and food quality

Effect of salinity on DNA methylation and antioxidant phenolic compounds of wild watercress (Rorippa nasturtium aquaticum)

Epigenetic changes are involved in plant responses to stress. Cytosine methylation is one of the most important epigenetic changes, regulating gene expression. In this paper, the MSAP (methylation-sensitive amplification polymorphism) method was used to find out how the watercress (Rorippa nasturtium aquaticum) genome changed in response to 0, 60, 80, and 100 mM NaCl and how that affected phenylalanine ammonium lyase (PAL) activity, phenolic content, and antioxidant capacity. The results showed an inverse correlation between methylation levels and PAL activity and the contents of total phenolics and flavonoids, indicating salt stress-induced reprogramming of the methylation pattern of watercress, which has a negative effect on the synthesis of phenolics. The results revealed a significant decrease in phenolic contents and antioxidant activity under low and moderate salinity compared to control and an increase under strong salinity compared to moderate salinity. The findings of this study contribute to our understanding of the reprogramming of DNA methylation under salinity and its effect on watercress phenolic metabolism

VALOR TAXONOMICO DE LOS PERFILES FENOLICOS DEL POLEN DE ALGUNAS ESPECIES DE LA FAMILIA CACTACEAE

Tesi

Valor taxonómico de los perfiles fenólicos del polen de algunas especies de la familia cactaceae

Tesis. (Maestro en Ciencias en Gestión Ambiental). Instituto Politécnico Nacional, Centro Interdisciplinario de Investigación para el desarrollo Integral Regional. Unidad Durango. 2007. 1 archivo PDF, (92 páginas), tesis.ipn.m

EL METABOLISMO SECUNDARIO DE LAS PLANTAS, UN NUEVO CONCEPTO

Artículo de Investigació

Una mirada general al tomate de cáscara (Physalis)

Artículo publicado en la Revista Vidsupra Vol. 5 No. 2 del Centro Interdisciplinario de Investigación Integral Regional Unidad Durang

COMPOSICIÓN FENÓLICA DE TEJIDO FOLIAR Y DE POLEN DE Zea perennis

Artículo de Investigació

Phytochemical characterization and antioxidant properties of the wild edible acerola Malpighia umbellata Rose

The objective of the current study was to determine the phenolic composition and carotenoid contents of leaves, bark, and fruits of Malpighia umbellata, assess the changes in the phenolic composition and contents of carotenoids and vitamin C of its fruits in different stages of maturity, and evaluate the antioxidant properties of its leaves, bark, and fruits. Leaves accumulated the highest levels of flavonoids (10.55 mg/g dry extract), tannins (21.16 mg/g dry extract), and carotenoids (424 63 µg/g dry tissue); whereas, the highest level of total phenolics was found in bark (47.12 mg/g dry extract). The vitamin C content decreased with the maturity of fruits. Twenty-two phenolics were characterized by high performance liquid chromatography with diode array detection (HPLC-DAD). Apigenin-7-O-glycosides, phenolic acids, and flavonols were predominant in leaves, bark, and fruits, respectively. Important chemical variations were found during fruit ripening. The 2,2-diphenyl-1-picrylhydrazyl (DPPH•) scavenging activity and 2,2ʹ-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) inhibition assays revealed important antioxidant properties for this acerola

CARACTERIZACIÓN DE FENOLES DE Fouquieria splendens, Dodonaea viscosa y Physalis angulata POR TÉCNICAS CROMATOGRÁFICAS: RESULTADOS PRELIMINARES

Se prepararon extractos etanólicos para obtener compuestos fenólicos de tejidos foliares de Fouquieria splendens, Dodonaea viscosa y Physalis angulata. Los resultados de los análisis de cromatografía preparativa en papel (PC) y de cromatografía líquida de alta resolución con detector de arreglo de diodos (HPLC‐DAD) revelaron que los principales compuestos fenólicos presentes en las hojas de Fouquieria splendes fueron flavonoles y acidos fenólicos; los de Dodonaea viscosa fueron ácidos fenólicos, dihidroflavonoides, flavonas, y derivados glicósidos de los flavonoles quercetina y canferol; y los de Physalis angulata fueron ácidos fenólicos y derivados glicósidos de quercetina y canferol. Ya que tanto los ácidos fenólicos como los derivados de quercetina han sido reportados como compuestos antioxidantes, los resultados del presente trabajo sugieren que las tres especies pueden ser fuente importante de antioxidantes naturales

COMPARACIÓN DE DOS MÉTODOS PARA OBTENER ADN TOTAL DE Phaseolus vulgaris PARA ANÁLISIS DE ISTR

Artículo Científic