Chlorophyll b
Names | |
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IUPAC name
Chlorophyll b | |
Systematic IUPAC name
Magnesium [methyl (3S,4S,21R)-14-ethyl-13-formyl-4,8,18-trimethyl-20-oxo-3-(3-oxo-3-{[(2E,7R,11R)-3,7,11,15-tetramethyl-2-hexadecen-1-yl]oxy}propyl)-9-vinyl-21-phorbinecarboxylatato(2-)-κ2N,N'] | |
Other names
β-Chlorophyll | |
Identifiers | |
519-62-0 | |
3D model (Jmol) | Interactive image |
ChemSpider | 16739843 |
ECHA InfoCard | 100.007.522 |
EC Number | 208-272-4 |
E number | E140 (colours) |
PubChem | 6450186 11593175 (from spinach) |
UNII | 5712ZB110R |
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Properties | |
C55H70MgN4O6 | |
Molar mass | 907.49 g·mol−1 |
Appearance | Green |
Odor | Odorless |
Melting point | ~ 125 °C (257 °F; 398 K)[1] |
Insoluble[1] | |
Solubility | Very soluble in EtOH, ether, C5H5N Soluble in MeOH[1] |
Absorbance | See text |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
verify (what is ?) | |
Chlorophyll b is a form of chlorophyll. Chlorophyll b helps in photosynthesis by absorbing light energy. It is more soluble than chlorophyll a in polar solvents because of its carbonyl group. Its color is yellow, and it primarily absorbs blue light.[2]
In land plants, the light-harvesting antennae around photosystem II contain the majority of chlorophyll b. Hence, in shade-adapted chloroplasts, which have an increased ratio of photosystem II to photosystem I, there is a higher ratio of chlorophyll b to chlorophyll a.[3] This is adaptive, as increasing chlorophyll b increases the range of wavelengths absorbed by the shade chloroplasts.
References
- 1 2 3 Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
- ↑ photosynthesis pigments
- ↑ Kitajima and Hogan 2003
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