摘要:
A process for purifying an .alpha.-amino acid containing cyano impurities comprising heating an aqueous solution of the .alpha.-amino acid in the form of its alkali metal salt in the presence of an alkali metal hydroxide to decompose the cyano impurities.
摘要:
A chelate-forming fiber which has, in a fiber molecule, a group having an amino group and at least two hydroxyl groups bonded to carbon (preferably a group represented by the formula (1) described below), and has a capability of forming a chelate with metalloid elements including boron and germanium and compounds thereof, and which can be easily incinerated and can be prepared in a simple and safe manner at low cost; and a process for preparing the same; and a method for capturing metalloids or compounds thereof using the chelate-forming fiber are disclosed. (wherein G represents a sugar alcohol residue or a polyhydric alcohol residue, and R represents a hydrogen atom, a (lower) alkyl group, or G (G is as defined above and may be a group identical with or different from the above G).)
摘要:
A chelate-forming filter which comprises a filter medium made of natural, regenerated, or synthetic fibers wherein the fiber molecules have, incorporated therein, chelate-forming functional groups represented by general formula (1) [wherein G represents a residue of a chain sugar alcohol or of a polyhydric alcohol; and R represents hydrogen, (lower) alkyl, or -G (wherein G has the same meaning as the above G, and the two G's may be the same or different)] or (3) (wherein R1, R2, and R3 each represents lower alkylene; and n is an integer of 1 to 4).
摘要:
A benzopyran derivative represented by formula (I): ##STR1## wherein R.sub.0 represents an alkyl or alkenyl group having 10 to 20 carbon atoms, R.sub.1 to R.sub.3 each represent a methyl group or a hydrogen atom, and G represents a --CH.sub.2 CH(OH)CH.sub.2 OH or --CH(CH.sub.2 OH).sub.2 group; or a salt thereof, which has a high water-solubility and thus is usable in cosmetics.