Investigation of Chlorophyl-a Derived Compounds as Photosensitizer for Photodynamic Inactivation

*Listiana Oktavia scopus  -  Research Center for Chemistry, Indonesian Institute of Sciences (LIPI), Indonesia
Irma Mulyani scopus  -  Inorganic and Physical Chemistry Research Division, Institut Teknologi Bandung, Indonesia
Veinardi Suendo scopus  -  Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Indonesia
Received: 8 Feb 2021; Revised: 16 Mar 2021; Accepted: 17 Mar 2021; Published: 31 Mar 2021; Available online: 18 Mar 2021.
Open Access Copyright (c) 2021 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Chlorophyll has unique physicochemical properties which makes them good as photosensitizer of Photodynamic Inactivation (PDI). The physicochemical properties of chlorophyll as photosensitizer can be optimized through several routes.  One of the possible route is by replacing the metal ion center of chlorophyll with other ions. In this research, the effect of coordinated metal ion in the natural chlorophyll-a was studied for bacterial growth (S. aureus) inhibition. The replacement of metal in the center of chlorophyll hopefully can improve the intensity of Intersystem Crossing Mechanism (ISC) lead to the formation of singlet oxygen species. The chlorophyll a and b were isolated from spinach via precipitation technique using 1,4 dioxane and water. The chlorophyll a and b were separated using sucrose column chromatography. The thin layer chromatography result showed that chlorophyll a (Rf: 0.57) had been well separated with chlorophyll b (Rf: 0.408). The absorption spectra of chlorophyll a and b showed that the Soret band was observed at 411 and 425 nm, while the Q band appeared at 663 and 659 nm. Replacement of metal ion center shifted the Soret band of chlorophyll- a derivatives to lower energy region, while Q-band was slightly shifted to the higher energy region. The absorption and the fluorescence intensity were  also observed decreasing after ion replacement. The Inhibition activity investigation over S. aureus showed the highest inhibition activity was exhibited by Zn-pheophytin-a (66.8%) followed by chlorophyll a (30.1 %) and Cu-pheophytin-a (0%). The inhibition activity is correlated with decreasing fluorescence intensity. The formation of singlet oxygen by ISC mechanism is hypothesized to deactivate the excitation state of Cu-pheophytin-a. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (


Keywords: Chlorophyll a; Pheophytin; Photosensitizer; Photodynamic inactivation; Sucrose
Funding: Institut Teknologi Bandung under contract Riset dan Inovasi ITB 2020

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