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The Ability of Chlorophyll to Trap Carcinogen Aflatoxin B1: A Theoretical Approach. Int J Mol Sci 2022; 23:ijms23116068. [PMID: 35682746 PMCID: PMC9181093 DOI: 10.3390/ijms23116068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/19/2022] [Accepted: 05/26/2022] [Indexed: 01/27/2023] Open
Abstract
The coordination of one and two aflatoxin B1 (AFB1, a potent carcinogen) molecules with chlorophyll a (chl a) was studied at a theoretical level. Calculations were performed using the M06-2X method in conjunction with the 6-311G(d,p) basis set, in both gas and water phases. The molecular electrostatic potential map shows the chemical activity of various sites of the AFB1 and chl a molecules. The energy difference between molecular orbitals of AFB1 and chl a allowed for the establishment of an intermolecular interaction. A charge transfer from AFB1 to the central cation of chl a was shown. The energies of the optimized structures for chl a show two configurations, unfolded and folded, with a difference of 15.41 kcal/mol. Chl a appeared axially coordinated to the plane (α-down or β-up) of the porphyrin moiety, either with the oxygen atom of the ketonic group, or with the oxygen atom of the lactone moiety of AFB1. The complexes of maximum stability were chl a 1-α-E-AFB1 and chl a 2-β-E-AFB1, at −36.4 and −39.2 kcal/mol, respectively. Additionally, with two AFB1 molecules were chl a 1-D-2AFB1 and chl a 2-E-2AFB1, at −60.0 and −64.8 kcal/mol, respectively. Finally, biosorbents containing chlorophyll could improve AFB1 adsorption.
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Rizzi V, Gubitosa J, Fini P, Fraix A, Sortino S, Agostiano A, Cosma P. Development of Spirulina sea-weed raw extract/polyamidoamine hydrogel system as novel platform in photodynamic therapy: Photostability and photoactivity of chlorophyll a. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 119:111593. [PMID: 33321637 DOI: 10.1016/j.msec.2020.111593] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 09/16/2020] [Accepted: 10/03/2020] [Indexed: 10/23/2022]
Abstract
The aim of this paper is to present and characterize Polyamidoamine-based hydrogels (PAA) as scaffolds to host photoactive Chlorophyll a (Chl a) from Spirulina (Arthrospira platensis) sea-weed Extract (SE), for potential applications in Photodynamic Therapy (PDT). The pigment extracted from SE was blended inside PAA without further purification, according to Green Chemistry principles. A comprehensive investigation of this hybrid platform, PAA/SE-based, was thus performed in our laboratory and, by means of Visible absorption and emission spectroscopies, the Chl a features, stability and photoactivity were studied. The obtained results evidenced the presence of two main Chl a forms, monomeric and dimeric, interacting with hydrogel polyamidoamines network. To better understand the nature of this interaction, the spectroscopic investigation of this system was performed both before and after the solidification of the hydrogel, that occurred at least in 24 h. Then, focusing the attention on solid scaffold, the 1Chl a⁎ fluorescence lifetime and FTIR-ATR analyses of PAA/SE were carried out, confirming the findings. The swelling and Point Zero Charge (PZC) measurements of solid PAA and PAA/SE were additionally performed to investigate the hydrogel behavior in water. Chl a molecules blended in PAA were (photo) stable and photoactive, and this latter feature was demonstrated showing that the pigment induced, when swelled in water and under irradiation, the formation of singlet oxygen (1O2), measured by direct and indirect methods.
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Affiliation(s)
- Vito Rizzi
- Università degli Studi "Aldo Moro" di Bari, Dip. Chimica, Via Orabona, 4, 70126 Bari, Italy
| | - Jennifer Gubitosa
- Consiglio Nazionale delle Ricerche CNR-IPCF, UOS Bari, Via Orabona, 4, 70126 Bari, Italy
| | - Paola Fini
- Consiglio Nazionale delle Ricerche CNR-IPCF, UOS Bari, Via Orabona, 4, 70126 Bari, Italy
| | - Aurore Fraix
- Laboratory of Photochemistry, Department of Drug Sciences, University of Catania, Viale Andrea Doria 6, I-95125 Catania, Italy
| | - Salvatore Sortino
- Laboratory of Photochemistry, Department of Drug Sciences, University of Catania, Viale Andrea Doria 6, I-95125 Catania, Italy
| | - Angela Agostiano
- Università degli Studi "Aldo Moro" di Bari, Dip. Chimica, Via Orabona, 4, 70126 Bari, Italy; Consiglio Nazionale delle Ricerche CNR-IPCF, UOS Bari, Via Orabona, 4, 70126 Bari, Italy
| | - Pinalysa Cosma
- Università degli Studi "Aldo Moro" di Bari, Dip. Chimica, Via Orabona, 4, 70126 Bari, Italy; Consiglio Nazionale delle Ricerche CNR-IPCF, UOS Bari, Via Orabona, 4, 70126 Bari, Italy.
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Ben Fredj A. Theoretical Study of the Dimerization of Chlorophyll (a) and Its Hydrates: Implication for Chlorophyll (a) Aggregation. Helv Chim Acta 2016. [DOI: 10.1002/hlca.201500027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fredj AB, Ruiz-López MF. Theoretical Study of Chlorophyll a Hydrates Formation in Aqueous Organic Solvents. J Phys Chem B 2009; 114:681-7. [DOI: 10.1021/jp909380t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Arij Ben Fredj
- Equipe de Chimie et Biochimie Théoriques, SRSMC, Nancy-University, BP 70239, 54506 Vandoeuvre-lès-Nancy, France, and Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia
| | - Manuel F. Ruiz-López
- Equipe de Chimie et Biochimie Théoriques, SRSMC, Nancy-University, BP 70239, 54506 Vandoeuvre-lès-Nancy, France, and Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia
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Fredj AB, Lakhdar ZB, Ruiz-López MF. The structure of chlorophyll a–water complexes: insights from quantum chemistry calculations. Chem Commun (Camb) 2008:718-20. [DOI: 10.1039/b716800d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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