Appeal No. 95-2971
Application No. 07/742,260
1. Clarified konjac characterized in that it comprises glucomannan derived
from konjac which is substantially free of insoluble impurities; has a nitrogen content of
about 0.60 wt % or less; and readily dissolves in water to form a sol or gel having an
aqueous sol turbidity potential of less than 20 turbidity units as measured at 1.0 w/v %
concentration using the Formazin Turbidity Standard.
11. A method for production of the clarified konjac of claim 1 characterized by
the steps of:
[a] preparing an aqueous sol of crude konjac comprising insoluble impurities
and glucomannan;
[b] contacting the crude konjac sol with an extraction salt selected from one or
more of dicalcium phosphate, calcium phosphate, magnesium phosphate, and aluminum
sulfate in an amount effective to extract the insoluble impurities by precipitation;
[c] precipitating and removing the insoluble impurities;
[d] forming a glucomannan coagulate by treating the remaining aqueous sol with
isopropyl alcohol present in an amount sufficient to coagulate substantially all glucomannan
therein; and
[e] removing and drying the glucomannan coagulate to recover the clarified
glucomannan.
The references relied upon by the examiner are:
Shimizu et al. (Shimizu) 3,767,424 Oct. 23, 1973
Sugiyama et al. (Sugiyama) 3,856,945 Dec. 24, 1974
Fuller et al. (Fuller) 3,608,068 Sept. 21, 1971
Yamada et al. (Yamada) 4,036,655 July 19, 1977
Gaffar et al. (Gaffar) 4,183,914 Jan. 15, 1980
Koyama et al. (Koyama) 4,460,730 July 17, 1984
Hara (Hara I) 58-165,758 Sept. 30, 1983
(Japanese Patent)
Hara (Hara II) 59-227,267 Dec. 20, 1984
(Japanese Patent)
Fukuda H2-231,044 Sept. 13, 1990
(Japanese Patent)
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