Jisho

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だつさんそざい 脱酸素剤
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Noun
1. oxygen absorber; oxygen scavenger; small packet placed in packaged food to absorb oxygen and prevent oxidation​
Wikipedia definition
2. Oxygen absorber​An oxygen absorber is a small packet of material used to prolong the shelf life of food. They are used in food packaging to prevent food colour change, to stop oils in foods from becoming rancid, and also the growth of oxygen-using aerobic microorganisms such as fungi. Oxygen supports the growth of microorganisms and causes changes in color and rancid odors in packaged foods. Plastic packaging is less able to exclude oxygen from packaged foods than are the older glass and metal containers.
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