“Chlorophyll b”的意思、由来-开放百科全书

词条

Chlorophyll b

释义

References

{{DISPLAYTITLE:Chlorophyll b}}{{Chembox
| Name = Chlorophyll b
| Verifiedfields = changed
| Watchedfields = changed
| show_infobox_ref = no
| verifiedrevid = 455193602
| ImageFile = Chlorophyll b.svg
| ImageName = Structure of β-Chlorophyll
| IUPACName = Chlorophyll b
| SystematicName = 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′]
| OtherNames = β-Chlorophyll
|Section1={{Chembox Identifiers
| CASNo = 519-62-0
| CASNo_Ref = {{cascite|changed|CAS}}
| PubChem = 6450186
| PubChem1 = 11593175
| PubChem1_Comment = (from spinach)
| ChemSpiderID = 16739843
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| SMILES = CCC1=C(C2=NC1=CC3=C(C4=C([C@@H](C(=C4[N-]3)C5=NC(=CC6=NC(=C2)C(=C6C)C=C)[C@H]([C@@H]5CCC(=O)OC/C=C(\\C)/CCC[C@H](C)CCC[C@H](C)CCCC(C)C)C)C(=O)OC)[O-])C)C=O.[Mg+2]
| StdInChI = 1S/C55H71N4O6.Mg/c1-12-38-35(8)42-27-43-36(9)40(23-24-48(61)65-26-25-34(7)22-16-21-33(6)20-15-19-32(5)18-14-17-31(3)4)52(58-43)50-51(55(63)64-11)54(62)49-37(10)44(59-53(49)50)28-46-39(13-2)41(30-60)47(57-46)29-45(38)56-42;/h12,25,27-33,36,40,51H,1,13-24,26H2,2-11H3,(H-,56,57,58,59,60,62);/q-1;+2/p-1/b34-25+;/t32-,33-,36+,40+,51-;/m1./s1
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = NSMUHPMZFPKNMZ-VBYMZDBQSA-M
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| EC_number = 208-272-4
| InChI = 1S/C55H72N4O6.Mg/c1-12-38-35(8)42-27-43-36(9)40(23-24-48(61)65-26-25-34(7)22-16-21-33(6)20-15-19-32(5)18-14-17-31(3)4)52(58-43)50-51(55(63)64-11)54(62)49-37(10)44(59-53(49)50)28-46-39(13-2)41(30-60)47(57-46)29-45(38)56-42;/h12,25,27-33,36,40,51H,1,13-24,26H2,2-11H3,(H2,56,57,58,59,60,62);/q;+2/p-2/b34-25+;/t32-,33-,36+,40+,51-;/m1./s1
| InChIKey = MSLKMRUEVOYOOZ-VBYMZDBQSA-L
| UNII = 5712ZB110R
| UNII_Ref = {{fdacite|changed|FDA}}
|Section2={{Chembox Properties
| C=55 | H=70 | Mg=1 | O=6 | N=4
| Appearance = Green
| Odor = Odorless
| Density =
| MeltingPt = ~
| MeltingPtC = 125
| MeltingPt_ref = ^[1]
| Solubility = Insoluble^[1]
| SolubleOther = Very soluble in ethanol, ether, pyridine
Soluble in methanol^[1]
| Absorbance = See text
}}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 green, 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.


Structure of chlorophyll b molecule showing the long hydrocarbon tail

References

1. ^¹²{{CRC90}}
2. ^{{cite web|url=http://www2.mcdaniel.edu/Biology/botf99/photo/p3igments.html|title=Photosynthesis pigments}}
3. ^{{cite journal| last = Kitajima| first = Kaoru| last2 = Hogan| first2 = Kevin P| date = 2003| title = Increases of chlorophyll a/b ratios during acclimation of tropical woody seedlings to nitrogen limitation and high light| journal = Plant, Cell & Environment| volume = 26| issue = 6| pages = 857–865| doi = 10.1046/j.1365-3040.2003.01017.x}}

2 : Tetrapyrroles|Photosynthetic pigments

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