[ CONTRIBUTION A L’ETUDE DE LA DESINFECTION DE L’EAU PAR PHOTOSENSIBILISATION AVEC LES EXTRAITS DE PLANTES : CAS DES EXTRAITS COUMARINIQUES DE CITRUS LIMONUM, CITRUS PARADISI ET CITRUS RETICULATA ]
Volume 23, Issue 2, May 2018, Pages 89–94
Teddy Makuba SUNDA1 and Koto-te-Nyiwa Ngbolua2
1 Université de Kinshasa, Faculté des Sciences, Département de Chimie, Laboratoire de Chimie Organique et d’Energétique, BP 190, Kinshasa XI, RD Congo
2 Département de Biologie, Faculté des Sciences, Université de Kinshasa, BP 190 Kinshasa XI, RD Congo
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The study of improvement of solar water disinfection by photosensitization with coumarin extracts of some plants of Rutaceae family (Citrus limonum, Citrus paradisi and Citrus sinensis) shows an inhibition of 90% for fecal coliforms after 30 minutes of sunshine. Complete inhibition is noted after 60 minutes. In water not treated and exposed to the sunlight, an inhibition of 32% was noticed after 60 minutes. The photosensitizing activity noted in these extracts is due to the presence of coumarins. These molecules in presence of light absorb the energy and pass from the ground state to the excited state. Returning to the ground state, the stored energy is transferred to the oxygen, which then passes from the ground state, triplet, to the excited state, singlet, and inhibits the coliforms present in water.
Author Keywords: Photosensitization, coumarin extracts, singlet oxygen, fecal coliforms, sunlight.
Volume 23, Issue 2, May 2018, Pages 89–94
Teddy Makuba SUNDA1 and Koto-te-Nyiwa Ngbolua2
1 Université de Kinshasa, Faculté des Sciences, Département de Chimie, Laboratoire de Chimie Organique et d’Energétique, BP 190, Kinshasa XI, RD Congo
2 Département de Biologie, Faculté des Sciences, Université de Kinshasa, BP 190 Kinshasa XI, RD Congo
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The study of improvement of solar water disinfection by photosensitization with coumarin extracts of some plants of Rutaceae family (Citrus limonum, Citrus paradisi and Citrus sinensis) shows an inhibition of 90% for fecal coliforms after 30 minutes of sunshine. Complete inhibition is noted after 60 minutes. In water not treated and exposed to the sunlight, an inhibition of 32% was noticed after 60 minutes. The photosensitizing activity noted in these extracts is due to the presence of coumarins. These molecules in presence of light absorb the energy and pass from the ground state to the excited state. Returning to the ground state, the stored energy is transferred to the oxygen, which then passes from the ground state, triplet, to the excited state, singlet, and inhibits the coliforms present in water.
Author Keywords: Photosensitization, coumarin extracts, singlet oxygen, fecal coliforms, sunlight.
Abstract: (french)
L’étude de l’amélioration de la désinfection solaire de l’eau par photosensibilisation avec des extraits coumariniques de quelques plantes de la famille de Rutacées ( Citrus paradisi, Citrus limonum et Citrus sinensis) a montré une inhibition de l’ordre de 90 % des coliformes fécaux après une 30 minutes d’ensoleillement. Celle-ci passe à 100% après 60 minutes. Pour l’eau non traitée et exposée au soleil, une inhibition de l’ordre de 32% a été notée après 60 minutes. L’activité photosensibilisatrice remarquée dans ces extraits est due à la présence des coumarines. Celles-ci en présence de lumière absorbent l’énergie et passe de l’état fondamental à l’état excité. En revenant à l’état fondamental, l’énergie emmagasinée est transférée à l’oxygène qui passe dès lors de l’état fondamental, triplet, à l’état excité, singulet, tout en inhibant les coliformes présents dans le milieu.
Author Keywords: Photosensibilisation, extraits coumariniques, oxygène singulet, coliformes fécaux, ensoleillement.
How to Cite this Article
Teddy Makuba SUNDA and Koto-te-Nyiwa Ngbolua, “CONTRIBUTION TO THE STUDY OF WATER DISINFECTION BY PHOTOSENSITIZATION WITH PLANTS EXTRACTS : CASE OF CITRUS LIMONUM,CITRUS PARADISI AND CITRUS RETICULATE COUMARIN EXTRACTS,” International Journal of Innovation and Applied Studies, vol. 23, no. 2, pp. 89–94, May 2018.
