“Porphyran”的意思、由来-开放百科全书

Porphyran is a complex sulfated carbohydrate. It is a highly substituted agarose with a linear backbone consisting of 3-linked beta-D-galactosyl units alternating with either 4-linked alpha-L-galactosyl 6-sulfate or 3,6-anhydro-alpha-L-galactosyl units. The composition includes 6-O-sulfated L-galactose, 6-O-methylated D-galactose, L-galactose, 3,6-anhydro-L-galactose, 6-O-methyl D-galactose and ester sulfate. Some of the ester is present as 1-4-linked L-galactose 6-sulfate.^[1]^[2]^[3]^[4] The precise composition of porphyran shows seasonal and environmental variations.^[1] In Porphyra haitanensis, the L-residues are mainly composed of alpha-L-galactosyl 6-sulfate units, and the 3,6-anhydro-galactosyl units are minor.^[3] In Porphyra capensis, the ratio of alpha-L-galactose-6-sulfate and the 3,6-anhydrogalactose is 1.2:1.^[4]

1. ^¹²{{cite journal |vauthors=Rees DA, Conway E |author-link=Dai Rees (scientist) |title=The structure and biosynthesis of porphyran: a comparison of some samples |journal=Biochem. J. |volume=84 |issue= |pages=411–6 |date=August 1962 |pmid=14490986 |pmc=1243684 |doi= |url=}}
2. ^{{cite journal |vauthors=Peat S, Turvey JR, Rees DA |title=Carbohydrates of the red alga, Porphyra umbilicalis |journal=J. Chem. Soc. |volume= |issue= |pages=1590–5 |date=August 1961 |pmid= |pmc= |doi= 10.1039/jr9610001590|url=}}
3. ^¹{{cite journal |vauthors=Zhang Q, Li N, Liu X, Zhao Z, Li Z, Xu Z |title=The structure of a sulfated galactan from Porphyra haitanensis and its in vivo antioxidant activity |journal=Carbohydr. Res. |volume=339 |issue=1 |pages=105–11 |date=January 2004 |pmid=14659676 |doi= 10.1016/j.carres.2003.09.015|url=}}
4. ^¹{{cite journal |vauthors=Zhang Q, Qi H, Zhao T, etal |title=Chemical characteristics of a polysaccharide from Porphyra capensis (Rhodophyta) |journal=Carbohydr. Res. |volume=340 |issue=15 |pages=2447–50 |date=October 2005 |pmid=16150429 |doi=10.1016/j.carres.2005.08.009 |url=}}

Composition

See also

References