Lichenin

Lichenin is a complex polysaccharide occurring in certain species of lichens.

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Can be extracted from "Cetraria islandica (Iceland moss)" [1]

Studied since about 1957. [2]

Trivia? : In his 1960 novel Trouble with Lichen, John Wyndham gives the name "Lichenin" to a biochemical extract of lichen used to extend life expectancy beyond 300 years.

References

[1] http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_abst_e?cjc_v62-009_40_ns_nf_cjc Structure

[2] http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1202740