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PROANTHOCYANIDINS IN NEEDLES FROM SIX GENERA OF THE TAXODIACEAE

1986; Wiley; Volume: 73; Issue: 11 Linguagem: Inglês

10.1002/j.1537-2197.1986.tb10906.x

1537-2197

Helen A. Stafford, Hope H. Lester,

Fermentation and Sensory Analysis

Proanthocyanidin contents of needles ranged from a mean of 150 to 300 μ g per mg dry wt in five species from five genera of the Taxodiaceae, Sequoiadendron giganteum (Lindl.) Bucch., Metasequoiaglyptostroboides H. Hu and Cheng, Sequoia sempervirens (D. Don) Endl., Taxodium distichum L. Rich., and Sciadopitys verticillata Siebold and Zucc. However, significantly lower amounts (70 μ g per mg dry wt) were found in Cryptomeria japonica (L.f.) D. Don. This latter species as well as Sciadopitys verticillata , contained little or no prodelphinidin, while the other four species contained a ratio of procyanidin to prodelphinidin up to about 1:5. These data were based on analyses from three trees from each species. In addition, one tree from each species was examined in more detail. The major flavan‐3‐ol in all cases was (+)‐catechin, with only non‐detectable or trace amounts of (–)‐epicatechin. The triphenolic flavan‐3‐ol, (+)‐gallocatechin, was a minor constituent in all species, except Sciadopitys and Cryptomeria. The (–)‐epigallocatechin was detected in Metasequoia, Sequoiadendron and Sequoia. All contained either (–)‐epicatechin‐(+)‐catechin or (+)‐catechin‐(+)‐catechin as the major procyanidin dimer. Prodelphinidin dimers were only tentatively identified.