Study of chlorophyll characteristic on leaves as photodetector organic material

Abstract

Abstract. Arrohmah, Supriyanto A, Kusumandari. 2007. Study of chlorophyll characteristics on leaves as photodetector organic material. Biofarmasi 5: 67-72. The aim of research was to determine the chlorophyll characteristics optically and electrically on the leaves such as spinach (Amaranthus sp.), Morinda citrifolia, and cassava leaves. The optical measurement is absorbance with UV-Vis spectrophotometer and the electric conductivity with two-point probe methods. The absorbance of spinach was higher than the others. Data showed the conductivity on the dark of spinach, M. citrifolia and cassava leaves were (3.8133±0.0007)x10^-3 (?m)^-1, (3.2761±0.0006)x10^-3 (?m)^-1 and (1.893±0.001)x10^-3 (?m)^-1, respectively. In contrast, the conductivity on the lighted of spinach, M. citrifolia, and cassava leaves was (4.1947±0.0007)x10^-3 (?m)^-1, (3.4061±0.0007)x10^-3 (?m)^-1 and (2.0973±0.0006)x10^-3 (?m)^-1, respectively. The increased conductivity on the lighted spinach was higher than the others, i.e. (0.38±0.06)x10^-3 (?m)^-1. The total chlorophyll of spinach was 27 mg/L, M. citrifolia was 22 mg/L, and cassava was 16 mg/L. The reduction of total chlorophyll happened by degradation of chlorophyll molecules become its generation molecules.