Chlorophyll (ancient Greek: chloros = green and phyllon = leaf) is a green photosynthetic pigment found in plants, algae, and cyanobacteria. The first step in photosynthesis is when incoming light is absorbed by chlorophyll, ionizing it. The resulting chemical energy is then captured in the form of ATP, and ultimately to convert carbon dioxide and water to carbohydrates and oxygen. Chlorophyll absorbs most in the red and blue portions of the electromagnetic spectrum, thus its intense green color.
Chemical structure
Chlorophyll is a chlorin pigment, which is structurally similar to porphyrin pigments such as heme. At the center of the chlorin ring is a magnesium ion. This has various side chains, usually including a long phytyl chain. There are a few different forms that occur naturally:
Absorbance spectra of by chlorophyll a (green) and b (red)
Chlorophyll can be shown to be vital for photosynthesis by destarching a leaf from a variegated plant and exposing it to light for several hours. (Variegated leaves have green areas that contain chlorophyll and white areas that have none.) When tested with iodine solution, a color change revealing the presence of starch occurs only in regions of the leaf that were green and therefore contained chlorophyll. This shows that photosynthesis does not occur in areas where chlorophyll is absent and constitutes evidence that the presence of chlorophyll is a requirement for photosynthesis.
The antenna pigments are predominantly chlorophyll a, chlorophyll b and carotenoids; their absorption spectra are non-overlapping, this serves to broaden the specific bandwidths of light these individual compounds absorb during the process of photosynthesis.
Chlorophyll a is common to all eukaryotic photosynthetic organisms, and, due to its central role in the reaction center, is essential for photosynthesis.
Chlorophyll is a large molecule composed of hydrogen, carbon, oxygen, and magnesium coordinated with four central nitrogen atoms.
Chlorophyll is the greenpigment of plants which initiates photosynthesis by absorbing energy from sunlight and transferring this energy to other molecules.
Other studies have reported curative effects from chlorophyll and its derivatives, some of which are based on clinical studies while others are the result of animal experimentation, in a wide variety of anemia, protein deficiency hemorrhagic, phenol-hydrazine poisoning, pernicious, hypochromic of unknown etiology, and "experimental nutritional anemia" of unidentified character.
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