METHOD FOR IDENTIFYING SUNFLOWER OIL BASED ON LINOLIC OR OLEIC TYPE THEREOF

摘要

FIELD: chemistry.;SUBSTANCE: in the method, which involves collecting a (6.00±0.2) g oil sample, after collection, the oil sample is prepared by temperature control at (-8±0.2)°C for 1 hour, after which the oil sample is put into a the sensor of a pulsed NMR analyser, the signal amplitude of NMR triacylglycerine protons which are in liquid phase, the first (A₁), second (A₂) and third (A₃) component in percentages and the spin-spin relaxation time of triacylglycerine protons which are in liquid phase, the first (T₂₁), second (T₂₂) and third (T₂₃) component in milliseconds are measured and the average value of the spin-spin relaxation time (T_2SR) in milliseconds is calculated using the formula:; ;The linolic type of sunflower oil is indicated by the value of T_2SR ranging from 28 to 32 milliseconds, and the oleic type is indicated by the value of T_2SR ranging from 8 to 12 milliseconds.;EFFECT: simple, faster and safer analysis.;2 ex