Trichoxanthes kiritowii with high starch-content was investigated to utilize as a food source.
The weight and starch content of Trichoxanthes kiritowii roots increased rapidly in proportion to the growth period. The seasonal variations cf the starch content were 36.5∼48.0% (dry basis) from June to December. The chemical properties of natural growth soils of Trichoxanthes kiritowii contained mere organic matter and total nitrogen content than citrus orchard soils, but less mineral; P,K,Ca and Mg.
To prepare starch with the plant root, the centrifugal method(3,000 rpm, 20 min) obtained the highest yield. The industrial-scale method, was similar to the processing of sweetpotato starch (tank precipitation method), and was good in quality. The starch granules were mainly spherical with diameters ranging from 5∼16μ. The density of the starch was 1.535 and amylose content was about 26.7%. The X-ray diffraction pattern showed that the granules were of the B-type. The blue value of search, amylase and amylopectin was 0.46, 0.80 and 0.18, respectively. The starch contained 0.05% ash. 0.35% crude protein and 34 ㎎% phosphorus. and had an initial pasting temperature of 63.5℃. The color intensity of the starch which iodine gave rise to absorption maxima at 670㎚. The starch paste shay ed high stability during cold storage at 5℃.
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