Informatics Publishing Limited

M. Teuma Mbezi ¹, H. P. Ekobena Fouda ¹, C. B. Tabi ¹, T. C. Kofané ²

Affiliations
1 Laboratory of Biophysics, Department of Physics, Faculty of Sciences, University of YaoundeI, P. O. Box 812, Yaounde, CM
2 Laboratoryof Mechanics, Department of Physics, Faculty of Sciences, University of Yaoundel, P. O. Box 812, Yaounde, CM

Abstract

Objective: Our purpose is to propose a new method for studying the electrical activity of chlorophyll pigment solution. Methods/Statistical Analysis: The technic and method employed consisted of modeling the chlorophyll as an electrical circuit, which made up of two parallel branches; where R represents the extra chlorophyll space resistance, R’ the intra chlorophyll space resistance and C the chlorophyll capacitance. Then at low frequency, measure R according to the variation of light intensity. Chlorophyll fluorescence is generally used to study chlorophyll pigment solution; but it does not directly show us the electrical activity that occurs as the proposed method. Findings: Our study has shown that electric behavior of synthetic solution of pigment depends of the solution concentration. There is a consensus between the behavior of synthetic chlorophyll and the existing behavior of natural pigments for some concentrations; for example, for 5.1 g/L and 10.2 g/L the extra-chlorophyll resistance of the synthetic pigments, just like that of the natural pigments, decreases according to the intensity of light until it reaches a certain threshold. On the other hand, for concentrations of 4.25 g/L and 2.55 g/L we observe a different electric behavior. Moreover, it is noted that for concentrations reproducing the same electric behavior as for the natural pigments, the decrease of extra chlorophyll resistance is all the more marked that the concentration is high. These results are helpful because we can directly have the electrical behavior of chlorophyll than fluorescence, where we need first to determine parameters like: primary fluorescence (F0), maximal fluorescence (Fm), variable fluorescence (Fv), the photochemical quantic yield (ΦPSII ) of the photosystem II and the assimilation quantic yield of CO2 (ΦCO₂) before having an information about the electrical behavior of chlorophyll. Application/Improvements: This method of study can be applied in phototherapy about drugs made from chlorophyll to avoid side effects of chlorophyll solution.

Full Text