DEOXIDANT, DEOXIDANT PACKAGE, AND FOOD PACKAGE

To enhance the oxygen absorptive ability of a particulate deoxidant.SOLUTION: A deoxidant 20 includes a core part 21 containing a porous carrier and an oxygen absorption composition carried by the carrier and a layering shell part 22 that contains hydrophilic silica particles and covers the surface of the core part. The oxygen absorption composition includes a liquid formulation containing an oxygen absorptive substance, an alkaline compound made of a calcium compound, and a transition metal compound. C/Si>0.4 and Ca/Si>0.1 are satisfied, where C/Si is a ratio of an atomic number concentration % of carbon to an atomic number concentration % of silicon and Ca/Si is a ratio of an atomic number concentration % of calcium to an atomic number concentration % of silicon each in the shell part measured by energy dispersive X-ray analysis. The hydrophilic silica particles have an average particle diameter of less than 7 μm.SELECTED DRAWING: Figure 2 【課題】粒状の脱酸素剤において、酸素吸収能力をより向上させる。【解決手段】脱酸素剤２０は、多孔質の担持体と、担持体に担持された酸素吸収組成物とを含むコア部２１と、親水性シリカ粒子を含み、コア部の表面を被覆する層状のシェル部２２とを備える。酸素吸収組成物は、酸素吸収性物質を含む液剤、カルシウム化合物からなるアルカリ性化合物、および遷移金属化合物を含む。シェル部のエネルギー分散型Ｘ線分析測定における炭素の原子数濃度％とケイ素の原子数濃度％との比をＣ／Ｓｉ、カルシウムの原子数濃度％とケイ素の原子数濃度％との比をＣａ／Ｓｉとしたとき、Ｃ／Ｓｉ＞０．４かつＣａ／Ｓｉ＞０．１である。親水性シリカ微粒子の平均粒子径は７μｍ未満である。【選択図】図２