Chlorophyll concentration analysis

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Presentation transcript:

Chlorophyll concentration analysis Lab :7 Chlorophyll concentration analysis

Introduction: Chlorophylls are the essential photosynthetic pigments present in all green plants and algae, and allow them to convert sunlight into organic compounds in the process of photosynthesis. Chlorophyll makes plant& algae appears green because it reflects green color while absorbing all other colors.

Chlorophyll itself is actually not a single molecule but a family of related molecules, designated chlorophyll a, b, c, d, e and f. these pigments are relatively absorb slightly different wave length of visible light. The relative concentrations and dominancy within the cell of these chlorophylls varies with the species of algae, but chlorophyll a is dominant in all the eukaryotic algae and the prokaryotic blue-green algae (Cyanobacteria) and therefore its concentration is what is reported during chlorophyll analysis.

Other photosynthetic pigment found in algae as carotenoid (as β- carotene and phycobilin as phycocyanin & phycoerytherene) These accessory pigments are given color for algae and improve light energy absorption

Importance of chlorophyll measurements • Chlorophyll concentration is a measure of the abundance of algae or phytoplankton and help in algal taxonomic confusion. • Chlorophyll a, constitutes approximately 1% to 2% (dry weight) of planktonic algal biomass. This feature makes chlorophyll-a a convenient indicator of algal biomass. • The concentration of chlorophyll-a can be used to assess the physiological state of algae by examining its degradation products, phaeophytin and phaeophorbide.

Any chlorophyll analysis procedure is consisting of three main steps: 1-isolating the cells: The most typical way to separate algal cells from water is to filter the water sample to concentrate all the particles onto a filter. The filters are then soaked in a solvent that will extract the pigments from the cells, 2-extracting the chlorophyll: Pigment extraction was carried out through algal cells maceration in suitable organic solvent. The solvent most commonly used for this is 90% acetone, which has been shown to give the most efficient extraction without pigment alteration There are three commonly used methods of pigment extraction: sonication, grinding, and freezing. The idea is to rupture the chloroplasts so that the pigments can elute into the acetone without degradation