Santos, Diego T., Albarelli, Juliana Q., Joyce, Kieran, and Oelgemöller, Michael (2009) Sensitizer immobilization in photochemistry: evaluation of a novel green support. Journal of Chemical Technology and Biotechnology, 84 (7). pp. 1026-1030.

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Abstract

BACKGROUND: Green chemistry, also known as sustainable chemistry, refers to environmentally friendly chemicals and processes that result in reduced waste, elimination of costly end-of-the-pipe treatments; safer products, and reduced use of energy and resources. In this context this study aims to evaluate a novel green sensitizer support for photochemistry use. For this propose, Rose Bengal (RB) and juglone production were chosen as a model sensitizer and a model photoreaction, respectively.

RESULTS: The results showed that the RB-alginate beads prepared using a solution of 20% CaCl2 had better stability in the solvent t-amyl alcohol.Comparing all the immobilized systems a larger reaction yield (57.5%)was obtained when the proportion of the beads in the photoreactor flaskwas 5% (v/v). Although when using suspended RB the reaction yield was better (62%) the environmental friendly attributes and economical advantages of immobilized systems overcome it.

CONCLUSIONS: The potentiality of this new kind of sensitizer immobilization was demonstrated and a mechanism based on immobilization of cells was proposed. Furthermore the use of this novel green support presents a greater efficiency and potentially lower costs than the commercial supported RB Sensitox.

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