Nickel nitrate hexahydrate (98.5%), bismuth nitrate pentahydrate (98%), calcium nitrate tetrahydrate (≤99%), sodium nitrate (≤99.0%), ethylenediaminetetraacetic acid (≤98%), betaine (≤99.0%), d-(+)-glucose (≤99.5%), and dextran (Mr = 70 000) were purchased from Sigma Aldrich and used without any further purification.
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