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http://dx.doi.org/10.1016/S1011-1344(00)00146-9

has been cited by the following article:

• TITLE: Thermo-Stability of Natural Products Based on Chlorophyll Species Embedded in Silica Xerogel

  AUTHORS: José Martínez-Mendoza, Erika Espericueta-González, Diana Espericueta González, Gerardo Ortega-Zarzosa, Azdrubal Lobo Guerrero

  KEYWORDS: Chlorophyll, Structure, Biostability, Sol-Gel

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.7 No.4, April 20, 2016

  ABSTRACT: 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/H2O/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°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°C.