Synthesis of Polyoxamic Acid (2-Amino-2-deoxy-l-xylonic Acid |
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Authors: | Hiroyoshi Kuzuhara Hiroshi Ohrui Sakae Emoto |
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Affiliation: | The Institute of Physical and Chemical Research, Wako-shi, Saitama |
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Abstract: | The rate of precipitation of the retrograded amylose product from a dil. amylose solution was determined by the centrifugal method. The results showed that the relation of the quantity of precipitate vs. time did not fit the typical second order reaction for the coalescence of colloidal particles but fitted the crystallization formula, in appearance.The rate of precipitation was in proportion to (c-ca)1.5, where c is the amylose concentration and ca the concentration of the dil. solution phase in the phase-separated solution. When the temperature dependence of the rate was treated according to the crystallization of polymers, it was found that the rate was in proportion to Tm2/T(ΔT)2, where Tm is the melting point of the polymer in solution and ΔT is (Tm?T). The Tm thus obtained was 120°C for an amylose solution. These results suggested a certain correlation between the amylose retrogradation and the crystallization. |
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Keywords: | Escherichia coli Morganella morganii rmf gene alkaline phosphatase acid phosphatase/nucleoside pyrophosphate phosphotransferase |
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