The present invention quickly to free fatty acids in a sample containing vegetable oil and / or a plant which is a raw material thereof, to provide a method for quantitatively in a simple and accurate. A vegetable fat and / or the regression equation for the determination of free fatty acids in a sample comprising plant material which is a raw material thereof, the following steps (1) regression formula obtained by a process comprising - a (3) When, a method for quantifying the free fatty acids in the sample by using the near-infrared spectral data of the test sample in the wavelength region used for creation of the regression equation. (1) sample, step of measuring the near infrared spectrum of a solvent extract, or the solvent extract lipid concentrates obtained by removing the solvent from the sample (2) a step (1) free fatty acid in the sample were subjected to a specific process to quantify (3) the spectral data obtained in whole or part of a wavelength region in the wavelength range measured with near-infrared light spectrum, the quantitative value of free fatty acid was analyzed by multivariate analysis, the factors associated with the free fatty acids step is determiningBACKGROUND
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