Abstract: The method of the present invention includes a step (i) in which a voltage is applied between first and second electrodes 21 and 22 so that the first electrode serves as a cathode, with the first and second electrodes 21 and 22 being placed in contact with a material that allows ions to move therethrough. The material includes an adsorbent (gel 11) containing a macromolecule that has adsorbed a metal ion. The macromolecule contains the same constitutional units as those contained in a macromolecule extracted from Aphanothece sacrum. The first electrode 21 is placed in contact with the adsorbent in step (i). The metal is deposited on a surface of the first electrode 21 by applying the voltage in step (i).

Abstract: A sugar derivative derived from Aphanothece sacrum as a freshwater blue-green alga, having a mean molecular weight of 2,000,000 or more and a repeat structure of a sugar chain unit where a sugar constituent of a hexose structure and a sugar constituent of a pentose structure are conjugated together in a linear chain or a branched chain, containing a lactated, sulfated sugar as a constituent, where 2.7 or more hydroxyl groups per 100 hydroxyl groups are sulfated or sulfur element occupies 1.5% by weight or more of all of the elements, in the sugar chain unit. A sugar derivative with a novel polysaccharide structure as derived from Aphanothece sacrum is provided in such manner.

Abstract: The method of the present invention includes a step (i) in which a voltage is applied between first and second electrodes 21 and 22 so that the first electrode serves as a cathode, with the first and second electrodes 21 and 22 being placed in contact with a material that allows ions to move therethrough. The material includes an adsorbent (gel 11) containing a macromolecule that has adsorbed a metal ion. The macromolecule contains the same constitutional units as those contained in a macromolecule extracted from Aphanothece sacrum. The first electrode 21 is placed in contact with the adsorbent in step (i). The metal is deposited on a surface of the first electrode 21 by applying the voltage in step (i).

Abstract: A sugar derivative derived from Aphanothece sacrum as a freshwater blue-green alga, having a mean molecular weight of 2,000,000 or more and a repeat structure of a sugar chain unit where a sugar constituent of a hexose structure and a sugar constituent of a pentose structure are conjugated together in a linear chain or a branched chain, containing a lactated, sulfated sugar as a constituent, where 2.7 or more hydroxyl groups per 100 hydroxyl groups are sulfated or sulfur element occupies 1.5% by weight or more of all of the elements, in the sugar chain unit. A sugar derivative with a novel polysaccharide structure as derived from Aphanothece sacrum is provided in such manner.