Chlorophyll b

Chlorophyll b is a form of chlorophyll , one of the auxiliary pigments of photosynthesis in higher plants , green algae and euglena. , as well as in cyanobacteria of the prochlorophyte group.

Chlorophyll b
Are common
Chem. formula	C₅₅H₇₀MgN₄O₆
Rat formula	C 55 H 70 O 6 N 4 Mg
Physical properties
Molar mass	907.47 g / mol
Classification
Reg. CAS number
PubChem
Reg. EINECS number
Smiles
Inchi
Codex Alimentarius
Chebi	27888
ChemSpider
Security
NFPA 704	0 0 0

In cyanobacteria of the genus Prochlorococcus , its special form, divinyl-chlorophyll b , sometimes called chlorophyll b _{2, has} been discovered ^[1]

Chlorophyll b differs from chlorophyll a by the presence of a formyl radical instead of the methyl chlorine ring at position 7. Because of this, compared with chlorophyll a, it is more soluble in polar solvents. It absorbs light mainly in the blue part of the spectrum ^[2] , and therefore has a yellow-green color.

The vast majority of chlorophyll b in the organisms containing it is present in the light harvesting complexes of photosystem II ^[3] . In nature, chlorophyll b never occurs in complexes of reaction centers .

The content of chlorophyll b in higher plants and most green algae is about 1/3 of the content of chlorophyll a. It usually increases when adapting to a lack of lighting ^[4] due to the increase in the size of the light-collecting antenna of photosystem II . At the same time, dark adaptation broadens the range of wavelengths absorbed by chloroplasts adapted to low light.