期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Structural Comportment of Extract of Bougainvillea xbuttiana Flower Incorporated in Silica Xerogel Matrix
1
作者 José Martínez-Mendoza Erika Espericueta-González +2 位作者 Diana Espericueta-González Gerardo Ortega-Zarzosa Azdrubal Lobo Guerrero 《American Journal of Plant Sciences》 2016年第6期828-833,共6页
Measurement of the fluorescence comportment of Bougainvillea xbuttiana flowers embedded in silica xerogels matrix prepared with two different water to tetraethyl-orthosilicate [Si(OC<sub>2</sub>H<sub>... Measurement of the fluorescence comportment of Bougainvillea xbuttiana flowers embedded in silica xerogels matrix prepared with two different water to tetraethyl-orthosilicate [Si(OC<sub>2</sub>H<sub>5</sub>)<sub>4</sub>] ratio molar of 11 and 5, without heat-treatment, we report the grade of biostability of compound. The structural comportment for the PSI and PSII present in Bougainvillea flower is similar to the structural comportment for these photosystems present in leaves when they are incorporated on inorganic matrix such as silica xerogels. The contribution of the natural pigment of this kind of flower such as betalains which consist of betaxanthins and betacyanins, determines their colors contributed in the range of wavelength from about 550 nm to 660 nm. 展开更多
关键词 Betalaine CHLOROPHYLL Structure BIOSTABILITY SOL-GEL
下载PDF
Thermo-Stability of Natural Products Based on Chlorophyll Species Embedded in Silica Xerogel
2
作者 José Martínez-Mendoza Erika Espericueta-González +2 位作者 Diana Espericueta González Gerardo Ortega-Zarzosa Azdrubal Lobo Guerrero 《American Journal of Analytical Chemistry》 2016年第4期356-362,共7页
This work studied the thermostability and the biostability of chlorophyll species obtained from an extract of spinach leaves embedded in a silica xerogel matrix. The analysis was done by monitoring the photosystem II ... This work studied the thermostability and the biostability of chlorophyll species obtained from an extract of spinach leaves embedded in a silica xerogel matrix. The analysis was done by monitoring the photosystem II (PSII) using fluorescence spectroscopy. Samples were prepared using the sol gel method with a molar ratio of ethanol/H<sub>2</sub>O/TEOS of 4:11.6:1. Then, silica xerogel matrix was loaded with an extract of spinach leaves, obtained in dark conditions. The measurement of the fluorescence spectra was done at selected temperatures to the corresponding non-physiological regimen. Results indicate that the PSII band position remains unchanged when heat treatment temperature increases up 200&deg;C. For temperatures above 100?C, the fluorescence intensity diminishes linearly when the temperature increases. The photosystem II embedded in silica xerogel matrix is decomposed at temperatures above 200&deg;C. 展开更多
关键词 CHLOROPHYLL Structure BIOSTABILITY SOL-GEL
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部