CHLOROPHYLL

'Chlorophyll' is a green pigment found in most plants, algae, and cyanobacteria. Its name is derived from ancient Greek: ''chloros'' = green and ''phyllon'' = leaf. Chlorophyll absorbs light most strongly in the blue and red but poorly in the green portions of the electromagnetic spectrum, hence the green color of chlorophyll-containing tissues like plant leaves.

Contents

Chlorophyll and photosynthesis

Chemical structure

Spectrophotometry

See also

References

External links

Chlorophyll and photosynthesis

Chlorophyll is vital for photosynthesis, which allows plants to obtain energy from light. Chlorophyll molecules are specifically arranged in and around pigment protein complexes called photosystems which are embedded in the thylakoid membranes of chloroplasts. In these complexes, chlorophyll serves two primary functions. The function of the vast majority of chlorophyll (up to several hundred per photosystem) is to absorb light and transfer that light energy by resonance energy transfer to a specific chlorophyll pair in the reaction center of the photosystems. Because of chlorophyll’s selectivity regarding the wavelength of light it absorbs, areas of a leaf containing the molecule will appear green. There are currently two accepted photosystem units, Photosystem II and Photosystem I, which have their own distinct reaction center chlorophylls, named P680 and P700, respectively.^[1] These pigments are named after the wavelength (in nanometers) of their red-peak absorption maximum. The identity, function and spectral properties of the types of chlorophyll in each photosystem are distinct and determined by each other and the protein structure surrounding them. Once extracted from the protein into a solvent (such as acetone or methanol), these chlorophyll pigments can be separated in a simple paper chromatography experiment, and, based on the number of polar groups between chlorophyll a and chlorphyll b, will chemically separate out on the paper.
The function of the reaction center chlorophyll is to use the energy absorbed by and transferred to it from the other chlorophyll pigments in the photosystems to undergo a charge separation, a specific redox reaction in which the chlorophyll donates an electron into a series of molecular intermediates called an electron transport chain. The charged reaction center chlorophyll (P680⁺) is then reduced back to its ground state by accepting an electron. In Photosystem II, the electron which reduces P680⁺ ultimately comes from the oxidation of water into O₂ and H⁺ through several intermediates. This reaction is how photosynthetic organisms like plants produce O₂ gas, and is the source for practically all the O₂ in Earth's atmosphere. Photosystem I typically works in series with Photosystem II, thus the P700⁺ of Photosystem I is usually reduced, via many intermediates in the thylakoid membrane, by electrons ultimately from Photosystem II. Electron transfer reactions in the thylakoid membranes are complex, however, and the source of electrons used to reduce P700⁺ can vary. The electron flow produced by the reaction center chlorophyll pigments is used to shuttle H⁺ ions across the thylakoid membrane, setting up a chemiosmotic potential mainly used to produce ATP chemical energy, and those electrons ultimately reduce NADP⁺ to NADPH a universal reductant used to reduce CO₂ into sugars as well as for other biosynthetic reductions.

Reaction center chlorophyll-protein complexes are capable of directly absorbing light and performing charge separation events without other chlorophyll pigments, but the absorption cross section (the likelihood of absorbing a photon under a given light intensity) is small. Thus, the remaining chlorophylls in the photosystem and antenna pigment protein complexes associated with the photosystems all cooperatively absorb and funnel light energy to the reaction center. Besides chlorophyll ''a'', there are other pigments, called accessory pigments, which occur in these pigment-protein antenna complexes.

An easy experiment can show how chlorophyll is needed for photosynthesis.
Some plants have variegated leaves with white and green areas. Take such a plant and put it in the dark for a few days. Take a leaf and make a "mask" to cover it out of aluminium foil. Cut two holes in the foil such that one hole exposes a green part of the leaf and the other a white part of the leaf. Place the leaf in the light for an hour or so. If the leaf is exposed to a solution of iodine the green part of the leaf exposed to the light will show up black and the white part will not stain black. Furthermore, the black patch will have the same shape as the hole that you had cut in the foil. The iodine-stained starch only piles up in areas of the leaf that were green, showing that only those areas are photosynthetic. This proves that photosynthesis doesn't occur in the areas where there was no chlorophyll.

Chemical structure

Chlorophyllotion is a chlorin pigment, which is structurally similar to and produced through the same metabolic pathway as other porphyrin pigments such as heme. At the center of the chlorin ring is a magnesium ion. The chlorin ring can have several different side chains, usually including a long phytol chain. There are a few different forms that occur naturally:

	Chlorophyll ''a''	Chlorophyll ''b''	Chlorophyll ''c1''	Chlorophyll ''c2''	Chlorophyll ''d''
Molecular formula	C55H72O5N4Mg	C55H70O6N4Mg	C35H30O5N4Mg	C35H28O5N4Mg	C54H70O6N4Mg
C3 group	-CH=CH2	-CH=CH2	-CH=CH2	-CH=CH2	-CHO
C7 group	-CH3	-CHO	-CH3	-CH3	-CH3
C8 group	-CH2CH3	-CH2CH3	-CH2CH3	-CH=CH2	-CH2CH3
C17 group	-CH2CH2COO-Phytyl	-CH2CH2COO-Phytyl	-CH=CHCOOH	-CH=CHCOOH	-CH2CH2COO-Phytyl
C17-C18 bond	Single	Single	Double	Double	Single
Occurrence	Universal	Mostly plants	Various algae	Various algae	cyanobacteria

Common structure of chlorophyll ''a'', ''b'' and ''d''

Common structure of chlorophyll ''c1'', and ''c2''

Spectrophotometry

Measurement of the absorption of light is complicated by the solvent used to extract it from plant material, which affects the values obtained,

★ In diethylether, chlorophyll a has approximate absorbance maxima of 430 nm and 662 nm, while chlorophyll b has approximate maxima of 453 nm and 642 nm.^[2]

★ The absorption peaks of Chlorophyll a are at 665 nm and 465 nm. Chlorophyll a fluoresces at 673 nm. The peak molar absorption coefficient of chlorophyll a exceeds 10⁵ M⁻¹ cm⁻¹, which is among the highest for organic compounds.

See also

★ bacteriochlorophyll

★ Grow light

References

# Speer, Brian R. (1997). "Photosynthetic Pigments" in ''UCMP Glossary (online)''. University of California, Berkeley Museum of Paleontology. Verified availability March 12, 2007.
# PDF review-Chlorophyll d: the puzzle resolved
# Light Absorption by Chlorophyll – NIH books
1. Green, 1984
2. Gross, 1991

External links

★ Oregon University of Health & Sciences