Author： Özcan Tamer
Publisher： Springer Publishing Company
ISSN： 0003-021X
Source： Journal of the American Oil Chemists' Society, Vol.84, Iss.7, 2007-07, pp. : 653-662
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Abstract
Total oil content and the composition of fatty acids were analyzed in the acorns of 16 Quercus taxa from Turkey. The range of total fat varied between 0.7 and 7.4%. Oleic (10.2–54.4%), linoleic (24.2–49.1%), palmitic (13.4–30.4%), alpha linolenic (1.5–8.6%) and stearic acid (1.5–4.5%) were major fatty acids for all taxa. Significantly differences at section level were found (p < 0.05) for="" palmitic,="" stearic="" and="" oleic="" acid="" concentration.="" saturated="" (17.0–38.6%),="" mono="" unsaturated="" (11.0–55.5%)="" and="" unsaturated="" fatty="" acids="" (57.4–81.6%)="" in="" total="" oil="" were="" also="" significantly="" different="" between="" section="">Quercus, Cerris and Ilex (p < 0.05). in="" addition,="" sectional="" differences="" were="" significant="">p < 0.02) for="" the="" relative="" concentrations="" of="" saturated="" fatty="" acids="" compared="" to="" mono,="" poly="" and="" total="" unsaturated="" fatty="" acids.="" considerable="" variation="" of="" individual="" fatty="" acid="" levels="" were="" observed="" in="" related="" species="" and="" varieties.="" the="" species="" from="" section="">Ilex Loudon exhibited the highest levels of saturated fatty acid while the lowest levels were found in Q. brantii, Q. libani and Q. trojana from section Cerris Loudon. These species also had the highest levels of unsaturated fatty acids. Whereas the lowest values were detected in the species of section Ilex. Both varieties of Q. cerris showed significant differences (p < 0.05) from="" the="" other="" species="" in="" section="">Cerris for all parameters, except for stearic acid and exhibited little variations among their individual populations. Different concentrations of fatty acids may be useful biochemical markers for the characterization of Quercus at the infrageneric level. Interesting ratios of linoleic:α-linolenic acid especially in Q. robur ssp. robur, Q. hartwissiana, Q. vulcanica, Q. ithaburensis ssp. macrolepis and Q. libani also were detected with respect to dietary reference for fatty acid intake.
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