簡易型近赤外分光計による果実及び野菜中の糖度及び酸度の測定

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  • Measurement of Sugar and Acid Contents in Fruits and Vegetables by Compact Near InfraredSpectroscopy with Fiber Optics
  • カンイガタ キンセキガイ ブンコウケイ ニ ヨル カジツ オヨビ ヤサイ チュウ ノ トウド オヨビ サンド ノ ソクテイ

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The performance of the compact NIR instrument(Fruit Selector) in determining the total sugar and total acid contents of several fruits and vegetables was tested with comparing of Brix sugar meter and liquid sugar meter for total sugar contents, and titratable acidity and liquid acidimeter for total acid contents. A good correlation was obtained between total sugar contents by Fruit Selector and those by the existing two methods in seven kinds of fruits and vegetables. It was found that the total sugar contents of carrot, radish, onion and eggplant not covered by the instrument could be measured by using Fruit Selector. A good correlation was also obtained between the total acidity by Fruit Selector and those by titratable acidity in 3 kinds of fruits and vegetables. It was shown that the total acid contents of pineapple and kiwi fruits not covered by the instrument could be measured by using Fruit Selector. We tried to develop a calibration equation that relates the total sugar content (Brix) to the spectra of banana fruit, and found that the total sugar contents of banana fruit might be estimated by using Fruit Selector under a suitable calibration equation.

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