| 摘要 |
1,261,453. Preservative. INTERNATIONAL DIOXCIDE Inc. 3 March, 1969 [16 April, 1968], No. 11134/69. Heading A2D. [Also in Divisions A5 and C1] A substantially dry chlorine dioxide yielding composition for the preservation of fruits and vegetables from attack by fungi comprises a basic-reacting solid on which is adsorbed an aqueous solution of stabilized chlorine dioxide or of a chlorite, the composition releasing gaseous chlorine dioxide on acidification, suitably by means of a dry acid-reacting solid. The amount of composition to be used for preservation is suitably that sufficient to supply 0.001-1% chlorine dioxide gas by volume to the free space about the foodstuff. The chlorine dioxide solution is suitably stabilized by addition of a peroxy compound, e.g. sodium carbonate peroxide or sodium percarbonate, hydrogen, peroxide with alkali metal bicarbonate, sodium peroxide or sodium perborate. The solutions of chlorine dioxide or chlorite are adjusted to a pH of above 8 before adsorption. Suitable basic-reacting solids are synthetic calcium silicates, silica, talc, diatomaceous earth, charcoal, clays or volcanic ash-those adsorbents which are naturally acidic being adjusted to have a pH of at least 8 before use, e.g. with sodium hydroxide, carbonate or bicarbonate. Suitable acid-reacting solids are silica talc and normally basic adsorbents, e.g. calcium silicates, which have been made acidic by adsorption thereon of solutions of ferric chloride, aluminium chloride or hydrochloric, sulphuric or phosphoric acids. Powdered citric acid or solid acid salts, e.g. ferric chloride, aluminium chloride, aluminium sulphate or ferric sulphate, may also be used. |
