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Structure of cis-polyisoprene from Lactarius mushrooms

100%

Tanaka Y. , Kawahara S. , Eng A. H. , Takei A. , Ohaya N.

Acta Biochimica Polonica

1994

tom 41

nr 3

Sporophores from five species of Lactarius mushrooms had a liquid rubber content of 0.1 % to 7% based on the dry weight. Rubber from L. voleinus, L. chrysorrheus and L. hygrophoroides was found to be a homologue of polyprenol being composed of dimethylallyl group, two trans isoprene units, 160-300cis isoprene units, and terminal hydroxy! or ester group aligned in that order by 13C-NMR analysis. The ratio of fatty acid ester group to hydroxyl group was about 9/1 to 5/5. The number of both terminal groups and trans units decreased during aging of sporophores. Rubber from L. piperatus, L. vellereus and L. subpiperatus was found to be cis polyisoprene having very small quantities of both terminal groups and trans units. The biosynthesis of cis polyisoprene in Lactarius mushrooms was found to start from trans, trans-famesyl pyrophosphate. The termination was assumed to occur by esterification of polyisoprenyl pyrophosphate. Occurrence of some chemical modifications on both terminal groups was presumed during aging of sporophores.

Further evaluation of feeding deterrency of sesquiterpene lactones to storage pests

51%

Nawrot J. , Bloszyk E. , Grabarczyk H. , Drozdz B. , Daniewski W. M. , Holub M.

Prace Naukowe Instytutu Ochrony Roślin

1983

tom 25

nr 1

Kiszone grzyby

29%

Pawlowski W.

Echa Leśne

1997

tom 22

nr 11