title: A near infrared spectroscopic discrimination of noodle flours using a principal-component analysis coupled with chemical information.
abstract: Using a portable near infrared (NIR) spectrometer, we discriminated flours for making Japanese noodles (Soba), not only relying on a statistical and mathematical approach, but also on a chemical interpretation of the NIR spectra. In original NIR spectra, the particle-size difference, which results in an undesired systematic variation, was extracted and interpreted as the first-principal component factor by a principal-component analysis. The discrimination of flour materials cannot be satisfied by this factor. However, after a standardized treatment for the original spectra, the particle-size effects were eliminated; alternatively, differences in the chemical contents were extracted as principal-component factors. Using these factors, flour material discrimination was achieved much better. This study suggests a novel idea of utilizing the wavelength contribution ratio spectra for interpreting the factors extracted from the principal-component analysis for the NIR spectra. This report also describes the relationship between the NIR spectra and the chemical-analysis data.
authors.affiliation: Faculty of Engineering and Resource Science, Akita University, Japan. kumagai@arif.pref.akita.jp
authors.forename: Masanori
authors.initials: M
authors.lastname: Kumagai
authors.forename: Kikuko
authors.initials: K
authors.lastname: Karube
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Sato
authors.forename: Naganori
authors.initials: N
authors.lastname: Ohisa
authors.forename: Toshio
authors.initials: T
authors.lastname: Amano
authors.forename: Ryoei
authors.initials: R
authors.lastname: Kikuchi
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Ogawa
mesh_terms: D019612:Fagopyrum / Q000737:chemistry; D005433:Flour / Q000032:analysis*; D005504:Food Analysis / Q000379:methods*; D010316:Particle Size; D012680:Sensitivity and Specificity; D012984:Software; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014908:Triticum / Q000737:chemistry