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In France, at the request of Napoleon, Appert developed a way to preserve food in glass jars with wire and wax. In England, Durrrand developed the process using tin cans.
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John Mason developed jar with molded screw top, wire clamp, and replaceable rubber ring lid.
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Luis Pasteur heats wine to 122-140 degrees to prevent (acetobacter from) turning wine to vinegar.
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Pasteur's experiments convince American and European scientists to adopt Germ Theory (and abandon the competing belief that enzymes reacted spontaneously.)
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New York City mandates all milk be Pasteurized. Raw milk killed thousands, particularly children, from Tuberculosis and food poisoning but after NYC showed dramatic health improvement other cities followed.