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- W2014576576 abstract "Lipids were analyzed across the cross section of a trunk of Picea abies (L.) Karst. The amount of petroleum soluble lipids decreases from 1.1 % (outer sapwood) to 0.7 % (inner heartwood), while chloroform-methanol soluble lipids increase from 2.1 % to 4.6 %. No lipid phosphorus is present in the heartwood. Neutral glycerides represent 26 % of the lipids (petroleum soluble) in the outer sapwood and 8 % in the heartwood. 67 % of the glycerides from the sapwood are triglycerides, those from the heartwood contain 50 %. The ratio of triglycerides to di- and monoglycerides is 2 : 1 in the sapwood and 1 : 1 in the heartwood. The major free fatty acids in sapwood lipids are 16 : 0, 18 : 1 and 18 : 2. Heartwood lipids contain higher amounts of 18 : 2 and 20 :0 in the free form. The proportion of fatty acids with a chain length of 12 to 18 carbon atoms is higher in the total ester fraction extracted from the heartwood than that from the sapwood. The amount of total sterols increases from outer sapwood (10 % of petroleum solubles) to the inner heartwood (22 %). The free sterols account for most of the sterol increase. With the exception of palmitoleic acid there is no pronounced difference in the proportion of fatty acids in sterol esters across the trunkwood. The results indicate, that the dead heartwood of Picea abies (L.) Karst. contains neutral lipids, and these might be part of a defense mechanism against wood destroying organisms." @default.
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- W2014576576 date "1978-05-01" @default.
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- W2014576576 title "Lipids in the Sap- and Heartwood of Picea abies (L.) Karst." @default.
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