study on quantitative and qualitative changes in fatty acids of dog rose

abstract this experiment was conducted to study the effect of south-west climatic conditions on quantitative and qualitative of fatty acids in dog rose (rosa canina l.) seeds collected from five regions including: semirom (isfahan province), kiar and gerdbishe (charmahal and bakhtiari province), yasuj and meymand (kohgiluye and boyer ahmad province). oil was extracted using soxhlet apparatus; the fatty acid composition of oil was characterized and quantified using gc. the highest and lowest oil percentage obtained from meymand (11.05%) and kiar (8.15%), respectively. the results confirmed the presence of five dominant fatty acids in seeds of dog rose, including: linoleic, oleic, linolenic, palmitic and stearic acid, respectively. results showed that differences between fatty acids quantity in regions under study was significant (p<1%). the highest amount of linoleic, oleic and linolenic acid was related to gerdbishe (52.09%), semirom (40.47%) and kiar (17.47%), respectively. the lowest amount of linoleic, oleic and linolenic acid was obtained from semirom (37.24%), gerdbishe (22.69) and meymand (12.85%), respectively. the highest amount of palmitic and stearic acid was related to meymand (4.91%) and kiar (3.88%), respectively; and the lowest amount of palmitic and stearic acid was related to meymand (4.04% and 2.17%, respectively). the highest and lowest amount of unsaturated fatty acids was related to semirom (92.65%) and yasuj (90.07%), respectively. differences between amounts of fatty acid composition of dog rose seeds in regions under study was as result of difference in climatic factors.