Development of sorting system based on potato [Solanum tuberosum] starch content using visible and near-infrared spectroscopy
2007
Komiyama, S.(Hokkaido. Central Agricultural Experiment Station, Naganuma (Japan)) | Kato, J. | Honda, H. | Matsushima, K.
Starch content affects the taste, method of cooking and processing of potato tubers, and varies widely under different 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 0.87%, 0.58% and 0.86%, respectively. Accuracy of prediction was slightly affected by differences 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 effective for accurate and rapid selection of potato tubers based on starch content and could thus be used in packinghouses.
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