Japan Showa Chemical Co., Ltd. is developing a variety of fresh-keeping materials, one of which is to infiltrate minerals into absorbent paper bags and use them to package vegetables and fruits. During transportation, vegetables and fruits can be supplied with nutrients from mineral concentrates. The company also developed a high-purity calcium phosphate film mixed with polyethylene film. Practice has proved that calcium phosphate can absorb ethylene and carbon dioxide gas, inhibit the decomposition of chlorophyll, play a role in preservation.
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