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《Acta Agronomica Sinica》 1989-02
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Rapid Determination of Oil Content of Crop Seeds by Pulsed NMR

Song Tongming (Beijing Agricultural University)  
Three experiments designed to assess the accuracy of pulsed nuclear magneticspectroscopy(minispec PC20)have been carried out.Samples with known oil contentfrom 3% to 55%,made by mixing corn oil with liped-free corn meal,by mixing corn oilwith carbon tetrachioride,and by gravimetric analyses were determined by pulsed NMR.High correlation between NMR readouts and calculated oil content were found(r0.997).Seven repeated determinations of the same set of samples during 35 days indicatedthe stability of NMR measurements.When delay time=3500μ seconds,the total oil con-tent of corn seeds measured by pulsed NMR for room dried,presoaked for 8 hours,and60℃ over dried for 96 hours was about the same,indicating that seed moisture conditionhad no significant interference in oil determination.
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