Structures and Properties of Bracken (Pteris aquilinum L.) Starch

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Bracken (Pteris aquilinum L.) rhizome starch is manufactured in Kagoshima for limited uses. The bracken starch granules were small (average diameter 10-13μm) and gave a Cc-type X-ray diffractogram. The starch contained 19.7% amylose based on the iodine affinities of starch, amylose, and amylopectin. It contained 72 ppm of organic phosphorus mostly in the amylopectin molecule (90 ppm). The amylose molecules are rather small compared with starches of other underground organs having dj p. n 1990. d. p. w 3800 and the apparent d. p. distribution range of 670-8500. The c. 1. n of amylopectin was 21.5. Gelatinization temperature was 59.5°C by photopastegraphy. The maximum viscosity measured by a rapid visco analyzer (RVA) was 104 and 413 SNU at 6 and 10%, respectively, similar values to those of tapioca, sweet potato and arrowhead starches, but higher than those of kuzu and corn starches. The pasting behavior by an RVA was roughly between those of maize and potato. The retrogradation tendency of the starch was a little less than that of kuzu (Pueraria hirsuta Matsum) starch.
日本応用糖質科学会の論文