Method for determining food-product quality and food-product quality determination device

A method for determining a quality of a food product which is a determination target, based on a result of a measurement on a sample originating from the food product using a chromatograph mass spectrometer, the method comprising:

• a training sample measurement process in which, for a food product belonging to the same kind as the determination target, a plurality of training samples individually labeled with a known state of quality are subjected to a measurement using the chromatograph mass spectrometer under a same analysis condition;
• a training sample data collection process in which an index value related to a magnitude of a peak observed on an extracted ion chromatogram obtained as a result of the measurement in the training sample measurement process is acquired for each of the plurality of training samples, and the index value of the peak at each retention time common to all of the training samples is extracted;
• a discrimination model creation process in which a supervised training is performed to create a discrimination model, using, as training data, the index value of the peak at each retention time common to all of the training samples acquired for each of the plurality of labeled training samples in the training sample data collection process;
• an unknown sample measurement process in which a sample originating from the food product which is the determination target is subjected to a measurement using the chromatograph mass spectrometer under the aforementioned analysis condition;
• an unknown sample data collection process in which the index value of the peak at each retention time common to all of the training samples, observed in an extracted ion chromatogram obtained as a result of the measurement in the unknown sample measurement process, is acquired;
• and
• a discrimination execution process in which data of the peak index values acquired in the unknown sample data collection process are inputted into a discriminator based on the discrimination model, to obtain a quality discrimination result.