3.9 Article

Entrapment of chlorophyll from Chlorella vulgaris and Chlorella protothecoides into microporous silica synthesized by a sol-gel method

Journal

JOURNAL OF PHYSICS COMMUNICATIONS
Volume 5, Issue 10, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/2399-6528/ac26df

Keywords

Chlorella vulgaris; Chlorella protothecoides; covalent bonding; sol-gel method; optical properties

Funding

  1. Programa para el Desarrollo Profesional Docente, para el Tipo Superior (PRODEP) [CA31]
  2. Consejo Nacional de Ciencia y Tecnologia (CONACYT, Mexico) [168692]
  3. Ministery of Science, Technology and Innovation of Mexico City (Secretaria de Ciencia, Tecnologia e Innovacion del Distrito Federal, SECITI-DF) [PICSO 12-060]

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This study presents the preparation, absorption, and emission characterizations of chlorophyll samples from green microalgae, mainly chlorophyll a with a small amount of beta-carotene. The unique absorption and emission spectra of the microalgal chlorophyll samples were identified, showing a radiative energy transfer mechanism between the silica matrix and the chlorophyll.
This study presents results of the preparation, absorption and emission characterizations of chlorophyll samples extracted from green microalgae, based on the importance of this pigment and its optical properties. In this work, we characterized extracts containing chlorophyll from green microalgae of the genus Chlorella (C. vulgaris and C. protothecoides) via absorption and emission spectroscopies. The present results were compared with those of chlorophyll extracted from grass, previously reported. Microalgal chlorophyll samples were covalently bonded to the pore surface of organo-modified silica xerogels for a major spectroscopic analysis. Our findings indicate that the composition of green microalgal extracts corresponds mainly to chlorophyll a with a minimal amount of beta-carotene. UV-VIS, IR absorption and UV-VIS emission spectra of the samples displayed the typical bands of chlorophyll a, and some other bands ascribed to beta-carotene. Both the obtained absorption and emission spectra identify the algae chlorophyll bands and are unique. An effect of a radiative energy transfer mechanism between the silica matrix and the microalgal chlorophyll was observed as reabsorption bands in the emission spectra, and this effect was more evident in the C. vulgaris sample with respect to C. protothecoides.

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