Influence of nitrate concentration on pigment content in Chlorella pyrenoidosa
Abstract
Investigations on the qualitative and quantitative composition of pigments in the alga Chlorella pyrenoidosa cultured on mineral media with different nitrate content may give results serving to establish the optimal concentration of the nitrogen source in the medium. It was demonstrated that the interrelations between the particular pigments in 5 kinds of media containing 0, 0.128, 0.192, 0.256 and 0.384 g N/1, respectively, are most favourable in the medium threefold enriched in nitrates. This fact may be explained on the basis of the value of the coefficients:
chlorophyll a chlorophyll a + b
----------------- = 3.28 and ----------------------- = 3.13
chlorophyll b carotenoids
The lack of a nitrogen source in the medium causes significant changes in the total pigment content and in the particular fractions. It was also found that under conditions of nitrogen deficit the astaxanthin content increases.
chlorophyll a chlorophyll a + b
----------------- = 3.28 and ----------------------- = 3.13
chlorophyll b carotenoids
The lack of a nitrogen source in the medium causes significant changes in the total pigment content and in the particular fractions. It was also found that under conditions of nitrogen deficit the astaxanthin content increases.
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PDFDOI: https://doi.org/10.5586/asbp.1977.039
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