Physicochemical Properties of Starches Obtained from Various Parts of Sago Palm Trunks at Different Growth Stages.

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  • サゴヤシの生育段階および部位における澱粉の理化学的性質
  • サゴヤシ ノ セイイク ダンカイ オヨビ ブイ ニ オケル デンプン ノ リカガクテキ セイシツ

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Abstract

The physicochemical properties of starches obtained from various parts of sago palm trunks at different growth stages were studied. Experimental materials were prepared from trees grown on a field at Dalat Kampung Teh in Sarawak, Malaysia. Trees in 7 different growth stages at ages ranging from 9 to 14.5 years were selected according to Jong's classification. Each tree in the respective growth stage was divided into 5 equal fractions, from root part (No. 1) to top part (No. 5), and a total of 35 fractions were obtained. The starch samples were prepared by Jong from these fractions. Observations by scanning electron micrography and X-ray diffraction analysis were conducted. Granular size distribution, viscosity, and texture of samples were determined, and the following results were obtained. The starch fractions from the tree aged 14.5 years and the upper parts of its trunk consisted of largely fine particles. A sharper X-ray diffraction pattern was observed in starch from the upper part of the trunk than in starch from the lower part. An increased sharpness of the X-ray diffraction pattern of starch from the upper part was observed as the growth period increased. The starches from a 9-year-old palm reached maximum viscosity of 137-151 RVU at 88-92°C, whereas starch from a 14.5-year-old palm reached maximum viscosity as high as 142-163 RVU at 76-7VC. Moreover, the texture of the latter's starch gels was firmest among the samples tested.

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