Abstract: The oil of Brucea javanica (L.) Merr. has a better therapeutic effects for intrauterine, stomach and lungs cancer. ¹H NMR determination of this oil was carried out. Using an equation of author's thumb we estimated partial peak integrations in order to correct the interference of the CCH₂C strong peak to the neighbouring weak ones.
After the manner of reference[3] the amount of each functional group, ratio of quantities among various functional groups, esterification degree, unsaturation degree, average length of the saturated carbon chain, average carbon numbers in the combined fatty acids and average molecular weight per mole of oil were calculated. The analytical result showed that the amount of oleic acid in Brucea javanica (L.) Merr oil agrees with analytical result of gas chromatography.

Key words: ¹H NMR, Brucea javanica (L.) Merr.Oil, Estimation of integrations