How to use in-sentence of “preservative”:
+ For example, in 1928, “Staphylococcus” bacteria grew in a diphtheria vaccine that had no preservative in it.
+ Carrageenan is used in salad dressings and sauces, dietetic foods, and as a preservative in meat and fish products, dairy items and baked goods.
+ Since the 1930s some vaccines have contained the preservative thiomersal.
+ The dead frogs were gray and brown, but the preservative may have changed their color.
+ Preserved, dead frogs are dark purple-gray, but the preservative may have made it darker than a living frog.
