We applied the rapid, non-destructive and convenient near infrared (NIR) spectroscopy method, using a portable NIR spectrometer, to the manufacturing process of noodle products (Inaniwa Udon). Characterisation of wheat fl ours, which are a primary ingredient of noodle products, was identifi ed easily by the pricipal component (PC) score plots based on the standardised NIR spectra. We assessed these results not only from a practical standpoint, but also for the chemical interpretation of NIR spectra. Without any sample preparation, NIR spectra revealed moisture content in the products. Further investigation revealed that moisture content is proportional to viable bacterial counts in the products, so determining moisture content in products by the rapid, non-destructive and convenient method of using a portable NIR spectrometer, as used in this work, is extremely useful in the Inaniwa Udon quality control process.
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