304 Nippon Shokuhin Kagaku Kogaku Kaishi Vol. /., No.0, -*. -*3 (,**1) 58 * ** *** : * : ** *** Development of Sorting System Based on Potato Starch Content Using Visible and Near-Infrared Spectroscopy Seiichi Komiyama, Jun Kato*, Hiroyuki Honda** and Katsuyuki Matsushima*** Hokkaido Central Agricultural Experiment Station (present : Hokkaido Nuclear Energy Environmental Research Center),,0+ + Miyaoka, Kyowa, Hokkaido *./ *+,- * Hokkaido Central Agricultural Experiment Station (present : Hokkaido Tokachi Agricultural Experiment Station), Minami 3, Shinsei, Memuro, Hokkaido *2, **1+ ** Eminet Co., Ltd, +2 - Arimoto, Wakayama, Wakayama 0.* 2-3* *** Maki Manufacturing Co., Ltd, 0-* Shinogase, Hamamatsu, Shizuoka.-/ 2/.* Starch content a#ects the taste, method of cooking and processing of potato tubers, and varies widely under di#erent growing conditions. In order to enable the introduction of sorting machines based on the starch content of potato tubers, we investigated nondestructive determination of starch content using visible and near-infrared (NIR) spectroscopy under practical conditions. Potatoes were placed on a conveyor system and a photometric sensor was continuously applied. Using potato tubers of various sizes and varieties, partial least squares (PLS) regression was carried out relative to starch content as measured by specific gravity to the second derivative spectra. The standard error of prediction (SEP) for starch content of!danshaku-imo,!mayqueen and!kita-akari varieties were *.21, *. and *.20, respectively. Accuracy of prediction was slightly a#ected by di#erences in growing locations, by mud adhering to tuber surfaces, and by the temperature of tubers. It is concluded that the visible and NIR transmittance method is e#ective for accurate and rapid selection of potato tubers based on starch content and could thus be used in packinghouses. (Received Oct. -,,**0 ; Accepted Mar. +3,,**1) Keywords : potato, starch, nondestructive determination, near infrared spectroscopy, sorting : +, *03 +-3/ 0 +/ : *./ *+,-,0+ + * *03 +-3/ 0 +/ : *2, **1+ 3, ** 0.* 2-3* +2 - ***.-/ 2/.* 0-* Corresponding author komiyasi@agri.pref.hokkaido.jp +0 +, -.0 -
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63 : 309,,./,+.0 SEP. +. - - /* m min.,/ cm /* m min. CCD 1-* 3-* nm, PLS SEP *.21 *. *.20 SEP + -.- JA + 1- -/.* +331, -2 -. -/ +331 - -/ --0 -.,,**,., N 3/ /- 0. +303 / - ++1 /1 1. +311 0./ +/* +// +33* 1 /* p. 1-10 +333 2 Kawano, S., Watanabe, H. and Iwamoto, M., Determination of sugar content in intact peaches by near infrared spectroscopy with fiber optics in interactance mode. J. Japan. Soc. Hort. Sci., 0+,.././+ (+33,). 3 Kawano, S., Fujiwara, T. and Iwamoto, M., Nondestructive Determination of sugar content in satsuma mandarin using near infrared (NIR) transmittance. J. Japan. Soc. Hort. Sci., 0,,.0/.1* (+33-). +* 1* /+* /+/,**+ ++ -** +// +,**+ +, Chen, J.Y., Zhang, H., Miao, Y. and Matsunaga, R., NIR Measurement of Specific Gravity of Potato. Food Sci. Technol. Res., ++,,0 -+ (,**/). +- +03 +1+ +3/0 +. 1 0-0+0 1 - +* +2 +* - +3 - +3